React SelectBox Props

An object defining configuration properties for the SelectBox UI component.

acceptCustomValue

Specifies whether the UI component allows a user to enter a custom value. Requires the onCustomItemCreating handler implementation.

Type:

Boolean

Default Value: false

accessKey

Specifies the shortcut key that sets focus on the UI component.

Type:

String

Default Value: undefined

The value of this property will be passed to the accesskey attribute of the HTML element that underlies the UI component.

activeStateEnabled

Specifies whether the UI component changes its visual state as a result of user interaction.

Type:

Boolean

Default Value: true

The UI component switches to the active state when users press down the primary mouse button. When this property is set to true, the CSS rules for the active state apply. You can change these rules to customize the component.

Use this property when you display the component on a platform whose guidelines include the active state change for UI components.

buttons[]

Allows you to add custom buttons to the input text field.

Selector: Button
Type:

Array<DropDownPredefinedButton | TextEditorButton>

Default Value: undefined

Built-in buttons should also be declared in this array. You can find an example in the following demo:

View Demo

customItemCreateEvent

Specifies the DOM event after which the custom item should be created. Applies only if acceptCustomValue is enabled.

Type:

String

Default Value: 'change'

This property accepts a single event name or several names separated by spaces.

The recommended events are "blur", "change", and "focusout", but you can use other events as well. The default value of this property is "change", and items are created when the component loses focus.

If you want to enable custom item creation when users press the Tab key, assign "change" or "focusout" to this property.

NOTE
Besides the event passed to this property, the item can also be created when users press the Enter key. To allow users to create items only when they press the Enter key, pass an empty string to this property.

dataSource

Binds the UI component to data.

Default Value: null

The SelectBox works with collections of objects or string, number, or boolean values.

Depending on your data source, bind the SelectBox to data as follows. In each case, also specify the valueExpr, displayExpr, or both if the data source provides objects.

  • Data Array
    Assign the array to the dataSource option.

  • Read-Only Data in JSON Format
    Set the dataSource property to the URL of a JSON file or service that returns JSON data.

  • OData
    Implement an ODataStore.

  • Web API, PHP, MongoDB
    Use one of the following extensions to enable the server to process data according to the protocol DevExtreme UI components use:

    Then, use the createStore method to configure access to the server on the client as shown below. This method is part of DevExtreme.AspNet.Data.

    jQuery
    JavaScript
    $(function() {
        let serviceUrl = "https://url/to/my/service";
        $("#selectBoxContainer").dxSelectBox({
            // ...
            dataSource: DevExpress.data.AspNet.createStore({
                key: "ID",
                loadUrl: serviceUrl + "/GetAction",
                insertUrl: serviceUrl + "/InsertAction",
                updateUrl: serviceUrl + "/UpdateAction",
                deleteUrl: serviceUrl + "/DeleteAction"
            })
        })
    });
    Angular
    app.component.ts
    app.component.html
    app.module.ts
    import { Component } from '@angular/core';
    import CustomStore from 'devextreme/data/custom_store';
    import { createStore } from 'devextreme-aspnet-data-nojquery';
    
    @Component({
        selector: 'app-root',
        templateUrl: './app.component.html',
        styleUrls: ['./app.component.css']
    })
    export class AppComponent {
        store: CustomStore;
        constructor() {
            let serviceUrl = "https://url/to/my/service";
            this.store = createStore({
                key: "ID",
                loadUrl: serviceUrl + "/GetAction",
                insertUrl: serviceUrl + "/InsertAction",
                updateUrl: serviceUrl + "/UpdateAction",
                deleteUrl: serviceUrl + "/DeleteAction"
            })
        }
    }
    <dx-select-box ...
        [dataSource]="store">
    </dx-select-box>
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxSelectBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxSelectBoxModule
        ],
        providers: [],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template> 
        <DxSelectBox ...
            :data-source="store" />
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import CustomStore from 'devextreme/data/custom_store';
    import { createStore } from 'devextreme-aspnet-data-nojquery';
    import { DxSelectBox } from 'devextreme-vue/select-box';
    
    export default {
        components: {
            DxSelectBox
        },
        data() {
            const serviceUrl = "https://url/to/my/service";
            const store = createStore({
                key: "ID",
                loadUrl: serviceUrl + "/GetAction",
                insertUrl: serviceUrl + "/InsertAction",
                updateUrl: serviceUrl + "/UpdateAction",
                deleteUrl: serviceUrl + "/DeleteAction"
            });
            return {
                store
            }
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    import 'devextreme/dist/css/dx.light.css';
    
    import CustomStore from 'devextreme/data/custom_store';
    import { createStore } from 'devextreme-aspnet-data-nojquery';
    import SelectBox from 'devextreme-react/select-box';
    
    const serviceUrl = "https://url/to/my/service";
    const store = createStore({
        key: "ID",
        loadUrl: serviceUrl + "/GetAction",
        insertUrl: serviceUrl + "/InsertAction",
        updateUrl: serviceUrl + "/UpdateAction",
        deleteUrl: serviceUrl + "/DeleteAction"
    });
    
    class App extends React.Component {
        render() {
            return (
                <SelectBox ...
                    dataSource={store} />
            );
        }
    }
    export default App;
  • Any other data source
    Implement a CustomStore.

Regardless of the data source on the input, the SelectBox always wraps it in the DataSource object. This object allows you to sort, filter, group, and perform other data shaping operations. To get its instance, call the getDataSource() method.

NOTE

Review the following notes about data binding:

  • Do not specify the items property if you specified the dataSource, and vice versa.

  • Data field names cannot be equal to this and should not contain the following characters: ., :, [, and ].

jQuery
  • The stores are immutable. You cannot change their configurations at runtime. Instead, create a new store or DataSource and assign it to the dataSource property as shown in the following help topic: Get and Set Properties.
Angular
  • The stores are immutable. You cannot change their configurations at runtime. Instead, create a new store or DataSource and assign it to the dataSource property as shown in the following help topic: Two-Way Property Binding.
Vue
  • The stores are immutable. You cannot change their configurations at runtime. Instead, create a new store or DataSource and assign it to the dataSource property as shown in the following help topic: Two-Way Property Binding.
React
  • The stores are immutable. You cannot change their configurations at runtime. Instead, create a new store or DataSource and assign it to the dataSource property as shown in the following help topic: Controlled Mode.

View Demo

deferRendering

Specifies whether to render the drop-down field's content when it is displayed. If false, the content is rendered immediately.

Type:

Boolean

Default Value: true

Angular

If you set the deferRendering property to true, wrap the content in the Angular named template.

Vue

If you set the deferRendering property to true, wrap the content in the Vue named template.

disabled

Specifies whether the UI component responds to user interaction.

Type:

Boolean

Default Value: false

displayExpr

Specifies the data field whose values should be displayed.

Type:

String

|

Function

Function parameters:
item:

Object

The current item's data object.

Return Value:

String

The displayed value.

Default Value: undefined

View Demo

Set this property to the name of a data field that provides displayed values...

displayExpr: "name"

... or to a function that returns the displayed value:

displayExpr: function(item) {
    // "item" can be null
    return item && 'ID: ' + item.id + ', Name: ' + item.name;
}

Leave this property unspecified or set it to this if the data source contains primitives.

See Also

displayValue

Returns the value currently displayed by the UI component.

Type:

String

Read-only
Default Value: undefined

The value you pass to this property does not affect UI component behavior. Pass an observable variable to this property to get the value currently displayed by the UI component.

dropDownButtonComponent

An alias for the dropDownButtonTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.

dropDownButtonRender

An alias for the dropDownButtonTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.

dropDownButtonTemplate

Specifies a custom template for the drop-down button.

Type:

template

Template Data:
Name Type Description
icon

String

The button's icon.

text

String

The button's text.

Default Name: 'dropDownButton'

dropDownOptions

Configures the drop-down field which holds the content.

Default Value: {}

See Popup Configuration for properties that you can specify in this object.

Angular
NOTE
The nested component that configures the dropDownOptions property does not support event bindings and two-way property bindings.
Vue
NOTE
The nested component that configures the dropDownOptions property does not support event bindings and two-way property bindings.

elementAttr

Specifies the global attributes to be attached to the UI component's container element.

Selector: ElementAttr
Type:

Object

Default Value: {}

jQuery
$(function(){
    $("#selectBoxContainer").dxSelectBox({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});
Angular
HTML
TypeScript
<dx-select-box ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-select-box>
import { DxSelectBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxSelectBoxModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxSelectBox ...
        :element-attr="selectBoxAttributes">
    </DxSelectBox>
</template>

<script>
import DxSelectBox from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    data() {
        return {
            selectBoxAttributes: {
                id: 'elementId',
                class: 'class-name'
            }
        }
    }
}
</script>
React
App.js
import React from 'react';

import SelectBox from 'devextreme-react/select-box';

class App extends React.Component {
    selectBoxAttributes = {
        id: 'elementId',
        class: 'class-name'
    }

    render() {
        return (
            <SelectBox ...
                elementAttr={this.selectBoxAttributes}>
            </SelectBox>
        );
    }
}
export default App;

fieldComponent

An alias for the fieldTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.

fieldRender

An alias for the fieldTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.

fieldTemplate

Specifies a custom template for the text field. Must contain the TextBox UI component.

Type:

template

Template Data:

Object

The selected item's data.

Default Name: null

If you define a fieldTemplate, the component does not render the underlying HTML. In this case, you should render hidden input with the corresponding name attribute to submit values through a HTML form.

The example below shows how to define the fieldTemplate. If you want to customize the field's text, use the TextBox's value property.

jQuery
index.js
$(function() {
    $("#selectBox").dxSelectBox({
        // ...
        fieldTemplate(data, container) {
            container.append(
                $('<div>').dxTextBox({
                    value: data.Category + ": " + data.Name,
                    readOnly: true
                })
            )
        },
    });
});
Angular
app.component.html
<dx-select-box ...
    fieldTemplate="field"
>
    <div *dxTemplate="let data of 'field'">
        <div>
            <dx-text-box 
                [value]="data && data.Category + ': ' + data.Name" 
                [readOnly]="true"
            >
            </dx-text-box>
        </div>
    </div>
</dx-select-box>
Vue
App.vue
<template>
    <DxSelectBox ...
        field-template="field"
    >
        <template #field="{ data }">
            <DxTextBox 
                :value="data && data.Category + ': ' + data.Name" 
                :read-only="true"
            />
        </template>
    </DxSelectBox>
</template>

<script>
// ...
import DxSelectBox from 'devextreme-vue/select-box';
import DxTextBox from 'devextreme-vue/text-box';

export default {
    components: {
        DxSelectBox,
        DxTextBox
    },
    data() {
        return {
            // ...
        }
    }
}
</script>
React
App.js
import React from "react";
import SelectBox from "devextreme-react/select-box";
import TextBox from "devextreme-react/text-box";

function Field(data) {
    return <TextBox value={data && data.Category + ': ' + data.Name} readOnly={true} />;
}
function App() {
    return (
        <SelectBox ...
            fieldRender={Field}
        />
        </div>
    );
}

export default App;

View Demo

See Also

focusStateEnabled

Specifies whether the UI component can be focused using keyboard navigation.

Type:

Boolean

Default Value: true

groupComponent

An alias for the groupTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.

grouped

Specifies whether data items should be grouped.

Type:

Boolean

Default Value: false

When this property is true, make sure that all data source objects have the following structure:

JavaScript
const dataSource = [{
    key: "Group 1", // Group caption 
    items: [ // Items in the group
        { ... },
        { ... }
    ]
}, {
    // ...
}];

You can supply data to this structure using the DataSource object's group property.

NOTE
  • Only one-level grouping is supported.

  • If you enable both this property and DataSource.paginate, the pagination works only on the group level.

SelectBox Demo TagBox Demo

See Also

groupRender

An alias for the groupTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.

groupTemplate

Specifies a custom template for group captions.

Type:

template

Template Data:

Object

The group's data.

Default Name: 'group'

height

Specifies the UI component's height.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The UI component's height.

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The height in pixels.

  • String
    A CSS-accepted measurement of height. For example, "55px", "20vh", "80%", "inherit".

  • Function (deprecated since v21.2)
    Refer to the W0017 warning description for information on how you can migrate to viewport units.

hint

Specifies text for a hint that appears when a user pauses on the UI component.

Type:

String

Default Value: undefined

hoverStateEnabled

Specifies whether the UI component changes its state when a user pauses on it.

Type:

Boolean

Default Value: true

inputAttr

Specifies the attributes to be passed on to the underlying HTML element.

Type: any
Default Value: {}

jQuery
$(function(){
    $("#selectBoxContainer").dxSelectBox({
        // ...
        inputAttr: {
            id: "inputId"
        }
    });
});
Angular
HTML
TypeScript
<dx-select-box ...
    [inputAttr]="{ id: 'inputId' }">
</dx-select-box>
import { DxSelectBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxSelectBoxModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxSelectBox
        :input-attr="inputAttr"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxSelectBox from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    data() {
        return {
            inputAttr: { id: 'inputId' }
        }
    }
}
</script>
React
App.js
import 'devextreme/dist/css/dx.light.css';

import SelectBox from 'devextreme-react/select-box';

const inputAttr = { id: 'inputId' };

export default function App() {
    return (
        <SelectBox
            inputAttr={inputAttr}
        />
    );
}
ASP.NET MVC Controls
Razor C#
Razor VB
@(Html.DevExtreme().SelectBox()
    .InputAttr("id", "inputId")
    // ===== or =====
    .InputAttr(new {
        @id = "inputId"
    })
    // ===== or =====
    .InputAttr(new Dictionary<string, object>() {
        { "id", "inputId" }
    })
)
@(Html.DevExtreme().SelectBox() _
    .InputAttr("id", "inputId")
    ' ===== or =====
    .InputAttr(New With {
        .id = "inputId"
    })
    ' ===== or =====
    .InputAttr(New Dictionary(Of String, Object) From {
        { "id", "inputId" }
    })
)

To improve accessibility, use this property to specify aria-label for the component.

jQuery
index.js
$(function(){
    $("#selectBoxContainer").dxSelectBox({
        // ...
        inputAttr: {
            'aria-label': 'your-label',
        },
    });
});
Angular
app.component.html
<dx-select-box ...
    [inputAttr]="{ 'aria-label': 'your-label' }">
</dx-select-box>
Vue
App.vue
<template>
    <DxSelectBox
        :input-attr="inputAttr"
    />
</template>

<script>
import DxSelectBox from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    data() {
        return {
            inputAttr: { 'aria-label': 'your-label' }
        }
    }
}
</script>
React
App.js
import SelectBox from 'devextreme-react/select-box';

const inputAttr = { 'aria-label': 'your-label' };

export default function App() {
    return (
        <SelectBox
            inputAttr={inputAttr}
        />
    );
}

You do not need to specify aria-label if you use label.

isValid

Specifies or indicates whether the editor's value is valid.

Type:

Boolean

Default Value: true

NOTE
When you use async rules, isValid is true if the status is "pending" or "valid".
See Also

itemComponent

An alias for the itemTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.

itemRender

An alias for the itemTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.

items

An array of items displayed by the UI component.

Selector: Item

The items array can contain:

  • Objects with fields described in this section
  • Objects with any other fields. In this case, specify the itemTemplate.

If you need to update the UI component items, reassign the entire items array as shown in the following example:

JavaScript
selectBoxInstance.option('items', newItems);

As an alternative to items, you can use the dataSource property. It accepts the DataSource object, whose underlying stores provide an API that allows you to update individual items without reassigning the entire item collection.

NOTE
Do not use the items property if you use dataSource, and vice versa.

View Demo

itemTemplate

Specifies a custom template for items.

Type:

template

Template Data:

Object

The current item's data.

Default Name: 'item'

label

Specifies a text string used to annotate the editor's value.

Type:

String

Default Value: ''

labelMode

Specifies the label's display mode.

Type:

LabelMode

Default Value: 'static', 'floating' (Material)

This property can have one of the following values:

labelMode Description Illustration
"static" The label is displayed above the input field. DevExtreme SelectBox: Static label mode
"floating" The label is used as a placeholder, but when the editor gets focus,
the label moves to the position above the input field.
DevExtreme SelectBox: Floating label mode
"hidden" The label is hidden. DevExtreme SelectBox: Hidden label mode
NOTE

If autofill is enabled in the browser, we do not recommend that you use "floating" mode. The autofill values will overlap the label when it is displayed as a placeholder. Use "static" mode instead.

maxLength

Specifies the maximum number of characters you can enter into the textbox.

Type:

String

|

Number

Default Value: null

If the number of entered characters reaches the value assigned to this property, the UI component does not allow you to enter any more characters.

minSearchLength

The minimum number of characters that must be entered into the text box to begin a search. Applies only if searchEnabled is true.

Type:

Number

Default Value: 0

name

The value to be assigned to the name attribute of the underlying HTML element.

Type:

String

Default Value: ''

Specify this property if the UI component lies within an HTML form that will be submitted.

noDataText

Specifies the text or HTML markup displayed by the UI component if the item collection is empty.

Type:

String

Default Value: 'No data to display'

The SelectBox component evaluates the noDataText property's value. This evaluation, however, makes the SelectBox potentially vulnerable to XSS attacks. To guard against these attacks, encode the HTML markup before you assign it to the noDataText property. Refer to the following help topic for more information: Potentially Vulnerable API - noDataText.

onChange

A function that is executed when the UI component loses focus after the text field's content was changed using the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onClosed

A function that is executed once the drop-down editor is closed.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onContentReady

A function that is executed when the UI component is rendered and each time the component is repainted.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

The model data. Available only if you use Knockout.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onCopy

A function that is executed when the UI component's input has been copied.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onCustomItemCreating

A function that is executed when a user adds a custom item. Requires acceptCustomValue to be set to true.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
component

SelectBox

The UI component's instance.

customItem

String

|

Object

|

Promise<any> (jQuery or native)

The field where to place a custom item.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

model any

Model data. Available only if you use Knockout.

text

String

The input field's text.

Default Value: function(e) { if(!e.customItem) { e.customItem = e.text; } }

View Demo

You can specify DOM events after which the component calls this function. Use the customItemCreateEvent property for this purpose. Besides the event passed to this property, the item can also be created when users press the Enter key.

The following code shows how to enable item creation when the Space key is pressed:

jQuery
index.js
$(function() {
    $("#selectBox").dxSelectBox({
        // ...
        items: [{ id: 1, text: 'item 1'}],
        acceptCustomValue: true,
        displayExpr: 'text',
        onCustomItemCreating: (args) => {
            if (!args.text) {
                args.customItem = null;
                return;
            }

            const { component, text } = args;
            const currentItems = component.option('items');

            const newId = currentItems.at(-1).id + 1;
            const newItem = {
                id: newId,
                text: text.trim(),
            };

            const itemInDataSource = currentItems.find((item) => item.text === newItem.text)
            if (itemInDataSource) {
                args.customItem = itemInDataSource;
            } else {    
                currentItems.push(newItem);
                component.option('items', currentItems);
                args.customItem = newItem;
            }
        },
        onKeyDown: (e) => {
            if (e.event.code === 'Space') {
                const event = new KeyboardEvent('keydown', {
                    key: 'Enter',
                    keyCode: 13,
                    which: 13,
                });
                const target = e.event.target;
                target.dispatchEvent(event);
            }
        }
    });
});
Angular
app.component.html
app.component.ts
<dx-select-box ...
    [items]="itemsArray"
    displayExpr="text"
    [acceptCustomValue]="true"
    (onCustomItemCreating)="onCustomItemCreating($event)"
    (onKeyDown)="onKeyDown($event)"
>
</dx-select-box>
// ...
export class AppComponent {
    itemsArray = [{ id: 1, text: 'item 1'}];

    onCustomItemCreating(args) {
        if (!args.text) {
            args.customItem = null;
            return;
        }

        const { component, text } = args;
        const currentItems = component.option('items');

        const newId = currentItems.at(-1).id + 1;
        const newItem = {
            id: newId,
            text: text.trim(),
        };

        const itemInDataSource = currentItems.find((item) => item.text === newItem.text)
        if (itemInDataSource) {
            args.customItem = itemInDataSource;
        } else {    
            currentItems.push(newItem);
            component.option('items', currentItems);
            args.customItem = newItem;
        }
    }
    onKeyDown(e) {
        if (e.event.code === 'Space') {
            const event = new KeyboardEvent('keydown', {
                key: 'Enter',
                keyCode: 13,
                which: 13,
            });
            const target = e.event.target;
            target.dispatchEvent(event);
        }
    }
}
Vue
App.vue
<template>
    <DxSelectBox ...
        :items="itemsArray"
        display-expr="text"
        :accept-custom-value="true"
        @customItemCreating="onCustomItemCreating"
        @keyDown="onKeyDown"
    >
    </DxSelectBox>
</template>

<script>
// ...
export default {
    components: {
        DxSelectBox
    },
    data() {
        return {
            itemsArray: [{ id: 1, text: 'item 1'}]
        }
    },
    methods: {
        onCustomItemCreating(args) {
            if (!args.text) {
                args.customItem = null;
                return;
            }

            const { component, text } = args;
            const currentItems = component.option('items');

            const newId = currentItems.at(-1).id + 1;
            const newItem = {
                id: newId,
                text: text.trim(),
            };

            const itemInDataSource = currentItems.find((item) => item.text === newItem.text)
            if (itemInDataSource) {
                args.customItem = itemInDataSource;
            } else {    
                currentItems.push(newItem);
                component.option('items', currentItems);
                args.customItem = newItem;
            }
        },
        onKeyDown(e) {
            if (e.event.code === 'Space') {
                const event = new KeyboardEvent('keydown', {
                    key: 'Enter',
                    keyCode: 13,
                    which: 13,
                });
                const target = e.event.target;
                target.dispatchEvent(event);
            }
        }
    }
}
</script>
React
App.js
// ...
const itemsArray = [{ id: 1, text: 'item 1'}];

const onCustomItemCreating = (args) => {
    if (!args.text) {
        args.customItem = null;
        return;
    }

    const { component, text } = args;
    const currentItems = component.option('items');

    const newId = currentItems.at(-1).id + 1;
    const newItem = {
        id: newId,
        text: text.trim(),
    };

    const itemInDataSource = currentItems.find((item) => item.text === newItem.text)
    if (itemInDataSource) {
        args.customItem = itemInDataSource;
    } else {    
        currentItems.push(newItem);
        component.option('items', currentItems);
        args.customItem = newItem;
    }
}

const onKeyDown = (e) => {
    if (e.event.code === 'Space') {
        const event = new KeyboardEvent('keydown', {
            key: 'Enter',
            keyCode: 13,
            which: 13,
        });
        const target = e.event.target;
        target.dispatchEvent(event);
    }
}

function App() {
    return (
        <SelectBox ...
            items={itemsArray}
            displayExpr="text"
            acceptCustomValue={true}
            onCustomItemCreating={onCustomItemCreating}
            onKeyDown={onKeyDown}
        />
    );
}

export default App;
See Also

onCut

A function that is executed when the UI component's input has been cut.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onDisposing

A function that is executed before the UI component is disposed of.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

The model data. Available only if you use Knockout.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onEnterKey

A function that is executed when the Enter key has been pressed while the UI component is focused.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

NOTE
This function is executed after the onKeyUp and onKeyDown functions.

onFocusIn

A function that is executed when the UI component gets focus.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onFocusOut

A function that is executed when the UI component loses focus.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onInitialized

A function used in JavaScript frameworks to save the UI component instance.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

Angular
app.component.html
app.component.ts
<dx-select-box ...
    (onInitialized)="saveInstance($event)">
</dx-select-box>
import { Component } from "@angular/core";
import SelectBox from "devextreme/ui/data_grid";
// ...
export class AppComponent {
    selectBoxInstance: SelectBox;
    saveInstance (e) {
        this.selectBoxInstance = e.component;
    }
}
Vue
App.vue (Options API)
App.vue (Composition API)
<template>
    <div>
        <DxSelectBox ...
            @initialized="saveInstance">
        </DxSelectBox>
    </div>
</template>

<script>
import DxSelectBox from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    data: function() {
        return {
            selectBoxInstance: null
        };
    },
    methods: {
        saveInstance: function(e) {
            this.selectBoxInstance = e.component;
        }
    }
};
</script>
<template>
    <div>
        <DxSelectBox ...
            @initialized="saveInstance">
        </DxSelectBox>
    </div>
</template>

<script setup>
import DxSelectBox from 'devextreme-vue/select-box';

let selectBoxInstance = null;

const saveInstance = (e) => {
    selectBoxInstance = e.component;
}
</script>
React
App.js
import SelectBox from 'devextreme-react/select-box';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.saveInstance = this.saveInstance.bind(this);
    }

    saveInstance(e) {
        this.selectBoxInstance = e.component;
    }

    render() {
        return (
            <div>
                <SelectBox onInitialized={this.saveInstance} />
            </div>
        );
    }
}
See Also
jQuery
  • Get a UI component Instance in jQuery
Angular
  • Get a UI component Instance in Angular
Vue
  • Get a UI component Instance in Vue
React
  • Get a UI component Instance in React

onInput

A function that is executed each time the UI component's input is changed while the UI component is focused.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onItemClick

A function that is executed when a list item is clicked or tapped.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

itemIndex

Number

The clicked item's index. If the UI component items are grouped, the index represents an object defining the group and item indexes: { group: 0, item: 0 }.

itemElement

HTMLElement | jQuery

The item's container.

itemData

Object

The clicked item's data.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onKeyDown

A function that is executed when a user is pressing a key on the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onKeyUp

A function that is executed when a user releases a key on the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onOpened

A function that is executed once the drop-down editor is opened.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onOptionChanged

A function that is executed after a UI component property is changed.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
value any

The modified property's new value.

previousValue any

The UI component's previous value.

name

String

The modified property if it belongs to the first level. Otherwise, the first-level property it is nested into.

model any

Model data. Available only if you use Knockout.

fullName

String

The path to the modified property that includes all parent properties.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

The following example shows how to subscribe to component property changes:

jQuery
index.js
$(function() {
    $("#selectBoxContainer").dxSelectBox({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});
Angular
app.component.html
app.component.ts
app.module.ts
<dx-select-box ...
    (onOptionChanged)="handlePropertyChange($event)"> 
</dx-select-box>
import { Component } from '@angular/core'; 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 

export class AppComponent { 
    // ...
    handlePropertyChange(e) {
        if(e.name === "changedProperty") { 
            // handle the property change here
        }
    }
}
import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { AppComponent } from './app.component'; 
import { DxSelectBoxModule } from 'devextreme-angular'; 

@NgModule({ 
    declarations: [ 
        AppComponent 
    ], 
    imports: [ 
        BrowserModule, 
        DxSelectBoxModule 
    ], 
    providers: [ ], 
    bootstrap: [AppComponent] 
}) 

export class AppModule { }  
Vue
App.vue
<template> 
    <DxSelectBox ...
        @option-changed="handlePropertyChange"
    />            
</template> 

<script>  
import 'devextreme/dist/css/dx.light.css'; 
import DxSelectBox from 'devextreme-vue/select-box'; 

export default { 
    components: { 
        DxSelectBox
    }, 
    // ...
    methods: { 
        handlePropertyChange: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    } 
} 
</script> 
React
App.js
import React from 'react';  
import 'devextreme/dist/css/dx.light.css'; 

import SelectBox from 'devextreme-react/select-box'; 

const handlePropertyChange = (e) => {
    if(e.name === "changedProperty") {
        // handle the property change here
    }
}

export default function App() { 
    return ( 
        <SelectBox ...
            onOptionChanged={handlePropertyChange}
        />        
    ); 
} 

onPaste

A function that is executed when the UI component's input has been pasted.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onSelectionChanged

A function that is executed when a list item is selected or selection is canceled.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
selectedItem

Object

The selected item's data.

model any

Model data. Available only if Knockout is used.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

onValueChanged

A function that is executed after the UI component's value is changed.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
value

Object

The UI component's new value.

previousValue

Object

The UI component's previous value.

model any

Model data. Available only if Knockout is used.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery. This field is undefined if the value is changed programmatically.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

SelectBox

The UI component's instance.

Default Value: null

opened

Specifies whether or not the drop-down editor is displayed.

Type:

Boolean

Default Value: false
Raised Events: onClosed onOpened

openOnFieldClick

Specifies whether a user can open the drop-down list by clicking a text field.

Type:

Boolean

Default Value: true

placeholder

The text that is provided as a hint in the select box editor.

Type:

String

Default Value: 'Select'

readOnly

Specifies whether the editor is read-only.

Type:

Boolean

Default Value: false

When this property is set to true, the following applies:

  • The editor's value cannot be changed using the UI.
  • Built-in action buttons are invisible.
  • Custom action buttons are visible but disabled. If a button should not be disabled, set its disabled property to false:

    jQuery
    index.js
    $(function() {
        $("#selectBoxContainer").dxSelectBox({
            // ...
            buttons: [{
                name: "myCustomButton",
                location: "after",
                options: {
                    onClick: function(e) {
                        // ...
                    },
                    disabled: false
                }
            }]
        });
    });
    Angular
    app.component.html
    app.component.ts
    app.module.ts
    <dx-select-box ... >
        <dxi-button
            name="myCustomButton"
            location="after"
            [options]="myCustomButtonConfig">
        </dxi-button>
    </dx-select-box>
    import { Component } from '@angular/core';
    
    @Component({
        selector: 'app-root',
        templateUrl: './app.component.html',
        styleUrls: ['./app.component.css']
    })
    export class AppComponent {
        myCustomButtonConfig = {
            onClick: (e) => {
                // ...
            },
            disabled: false
        };
    }
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxSelectBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxSelectBoxModule
        ],
        providers: [ ],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxSelectBox ... >
            <DxSelectBoxButton
                name="myCustomButton"
                location="after"
                :options="myCustomButtonConfig"
            />
        </DxSelectBox>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import DxSelectBox, {
        DxButton as DxSelectBoxButton
    } from 'devextreme-vue/select-box';
    
    export default {
        components: {
            DxSelectBox,
            DxSelectBoxButton
        },
        data() {
            return {
                myCustomButtonConfig: {
                    onClick: (e) => {
                        // ...
                    },
                    disabled: false
                }
            }
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import SelectBox, {
        Button as SelectBoxButton
    } from 'devextreme-react/select-box';
    
    class App extends React.Component {
        myCustomButtonConfig = {
            onClick: (e) => {
                // ...
            },
            disabled: false
        };
        render() {
            return (
                <SelectBox>
                    <SelectBoxButton
                        name="myCustomButton"
                        location="after"
                        options={this.myCustomButtonConfig}
                    />
                </SelectBox>
            );
        }
    }
    export default App;

    You can also hide a custom action button when the UI component becomes read-only. Set the button's visible property to false in the onOptionChanged function. To get the button, use the getButton(name) method:

    jQuery
    index.js
    $(function() {
        $("#selectBoxContainer").dxSelectBox({
            // ...
            buttons: [{
                name: "myCustomButton",
                // ...
            }],
            onOptionChanged: function(e) {
                if(e.name == "readOnly") {
                    const myButton = e.component.getButton("myCustomButton");
                    myButton.option("visible", !e.value); // Hide the button when readOnly: true
                }
            }
        });
    });
    Angular
    app.component.html
    app.component.ts
    app.module.ts
    <dx-select-box ...
        (onOptionChanged)="changeButtonState">
        <dxi-button
            name="myCustomButton"
            ...
        ></dxi-button>
    </dx-select-box>
    import { Component } from '@angular/core';
    
    @Component({
        selector: 'app-root',
        templateUrl: './app.component.html',
        styleUrls: ['./app.component.css']
    })
    export class AppComponent {
        changeButtonState(e) {
            if(e.name == 'readOnly') {
                let myButton = e.component.getButton('myCustomButton');
                myButton.option('visible', !e.value); // Hide the button when readOnly: true
            }
        }
    }
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxSelectBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxSelectBoxModule
        ],
        providers: [ ],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxSelectBox ...
            @option-changed="changeButtonState">
            <DxSelectBoxButton
                name="myCustomButton"
                ...
            />
        </DxSelectBox>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import DxSelectBox, {
        DxButton as DxSelectBoxButton
    } from 'devextreme-vue/select-box';
    
    export default {
        components: {
            DxSelectBox,
            DxSelectBoxButton
        },
        data() {
            return {
                // ...
            }
        },
        methods: {
            changeButtonState(e) {
                if(e.name == 'readOnly') {
                    let myButton = e.component.getButton('myCustomButton');
                    myButton.option('visible', !e.value); // Hide the button when readOnly: true
                }
            }
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import SelectBox, {
        Button as SelectBoxButton
    } from 'devextreme-react/select-box';
    
    class App extends React.Component {
        changeButtonState(e) {
            if(e.name == 'readOnly') {
                let myButton = e.component.getButton('myCustomButton');
                myButton.option('visible', !e.value); // Hide the button when readOnly: true
            }
        }
        render() {
            return (
                <SelectBox ...
                    onOptionChanged={this.changeButtonState}>
                    <SelectBoxButton
                        name="myCustomButton"
                        ...
                    />
                </SelectBox>
            );
        }
    }
    export default App;

View Demo

rtlEnabled

Switches the UI component to a right-to-left representation.

Type:

Boolean

Default Value: false

When this property is set to true, the UI component text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

JavaScript
DevExpress.config({
    rtlEnabled: true
});

DataGrid Demo Navigation UI Demo Editors Demo

searchEnabled

Specifies whether to allow search operations.

Type:

Boolean

Default Value: false

View Demo

NOTE
Searching works with source data of plain structure only. Subsequently, data can be transformed to hierarchical structure using the DataSource's group property.
See Also

searchExpr

Specifies the name of a data source item field or an expression whose value is compared to the search criterion.

Type:

getter

|

Array<getter>

Default Value: null

In most cases, you should pass the name of a field by whose value data items are searched. If you need to search elements by several field values, assign an array of field names to this property.

JavaScript
searchExpr: ["firstName", "lastName"]

For more information on searching, refer to the Search API section of the Data Layer article. For information on getters, refer to the Getters and Setters section of the Data Layer article.

View Demo

searchMode

Specifies a comparison operation used to search UI component items.

Default Value: 'contains'

searchTimeout

Specifies the time delay, in milliseconds, after the last character has been typed in, before a search is executed.

Type:

Number

Default Value: 500

selectedItem

Gets the currently selected item.

Type: any
Read-only
Default Value: null

showClearButton

Specifies whether to display the Clear button in the UI component.

Type:

Boolean

Default Value: false

The Clear button calls the reset method.

showDataBeforeSearch

Specifies whether or not the UI component displays unfiltered values until a user types a number of characters exceeding the minSearchLength property value.

Type:

Boolean

Default Value: false

If this property is disabled, the UI component does not display values until the number of typed characters exceeds the minSearchLength value, otherwise it displays all values regardless of the specified filtering condition.

View Demo

showDropDownButton

Specifies whether the drop-down button is visible.

Type:

Boolean

Default Value: true

showSelectionControls

Specifies whether or not to display selection controls.

Type:

Boolean

Default Value: false

spellcheck

Specifies whether or not the UI component checks the inner text for spelling mistakes.

Type:

Boolean

Default Value: false

stylingMode

Specifies how the UI component's text field is styled.

Type:

EditorStyle

Default Value: 'outlined', 'filled' (Material)

The following styles are available:

Text Editor Styling Modes

You can also use the global editorStylingMode setting to specify how the text fields of all editors in your application are styled.

tabIndex

Specifies the number of the element when the Tab key is used for navigating.

Type:

Number

Default Value: 0

The value of this property will be passed to the tabindex attribute of the HTML element that underlies the UI component.

text

The read-only property that holds the text displayed by the UI component input element.

Type:

String

Read-only

useItemTextAsTitle

Specifies whether the SelectBox uses item's text a title attribute.

Type:

Boolean

Default Value: false

If the property is set to true, the text that items within the SelectBox contain is passed to the title attribute of the respective item.

validationError

Information on the broken validation rule. Contains the first item from the validationErrors array.

Type: any
Default Value: null

See Also

validationErrors

An array of the validation rules that failed.

Type:

Array<any>

Default Value: null

validationMessageMode

Specifies how the message about the validation rules that are not satisfied by this editor's value is displayed.

Default Value: 'auto'

The following property values are possible:

  • auto
    The tooltip with the message is displayed when the editor is in focus.
  • always
    The tooltip with the message is not hidden when the editor loses focus.

validationMessagePosition

Specifies the position of a validation message relative to the component. The validation message describes the validation rules that this component's value does not satisfy.

Type:

Position

|

Mode

Default Value: 'auto'

If you set this property to auto, the component specifies the validation message position automatically.

The following example positions a validation message at the component's right:

jQuery
index.js
$(function() {
    $("#selectBoxContainer").dxSelectBox({
        // ...
        validationMessagePosition: 'right'
    }).dxValidator({
        validationRules: [{
            type: 'required',
            message: 'Required',
        }],
    });
});
Angular
app.component.html
<dx-select-box ...
    validationMessagePosition="right">
    <dx-validator>
        <dxi-validation-rule
            type="required"
            message="Required"
        >
        </dxi-validation-rule>
    </dx-validator>
</dx-select-box>
Vue
App.vue
<template>
    <DxSelectBox ...
        validation-message-position="right"
    >
        <DxValidator>
            <DxRequiredRule message="Required" />
        </DxValidator>
    </DxSelectBox>
</template>

<script>
    // ...
</script>
React
App.js
import React from 'react';
// ...

function App() {
    return (
        <SelectBox ...
            validationMessagePosition="right"
        >
            <Validator>
                <RequiredRule message="Required" />
            </Validator>
        </SelectBox>
    ); 

};
export default App;

validationStatus

Indicates or specifies the current validation status.

Default Value: 'valid'

The following table illustrates the validation status indicators:

validationStatus Indicator
"pending" DevExtreme editor validation status: pending
"valid" DevExtreme editor validation status: valid
"invalid" DevExtreme editor validation status: invalid

When you assign "invalid" to validationStatus, you can also use the validationErrors array to set an error message as shown below:

jQuery
index.js
$(function() {
    const selectBox = $("#selectBoxContainer").dxSelectBox({
        // ...
    }).dxSelectBox("instance");

    function setInvalidStatus(message) {
        selectBox.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});
Angular
app.component.html
app.component.ts
<dx-select-box
    [validationStatus]="validationStatus"
    [validationErrors]="validationErrors">
</dx-select-box>
// ...
export class AppComponent {
    validationStatus: string = "valid";
    validationErrors: any;
    // ...
    setInvalidStatus(message) {
        this.validationStatus = "invalid";
        this.validationErrors = [{ message: message }];
    }
}
Vue
App.vue
<template>
    <DxSelectBox ...
        :validation-status="validationStatus"
        :validation-errors="validationErrors"
    />
</template>

<script>
    // ...
    export default {
        // ...
        data() {
            return {
                validationStatus: "valid",
                validationErrors: []
            }
        },
        methods: {
            setInvalidStatus(message) {
                this.validationStatus = "invalid";
                this.validationErrors = [{ message: message }];
            }
        }
    }
</script>
React
App.js
import React, { useState } from 'react';
// ...

function App() {
    const [validationStatus, setValidationStatus] = useState("valid");
    const [validationErrors, setValidationErrors] = useState([]);

    const setInvalidStatus = message => {
        setValidationStatus("invalid");
        setValidationErrors([{ message: message }]);
    }

    return (
        <SelectBox
            validationStatus={validationStatus}
            validationErrors={validationErrors}
        />
    ); 

};
export default App;

value

Specifies the currently selected value. May be an object if dataSource contains objects, the store key is specified, and valueExpr is not set.

Type: any
Default Value: null
Raised Events: onValueChanged

When dataSource contains objects, you should define valueExpr to correctly identify data items. Otherwise, the component uses referential equality to compare objects. For example, when valueExpr is not specified and you assign an object with the same field and values as dataSource to the value property, these two objects are not equal, and the component displays nothing.

valueChangeEvent Deprecated

Use the customItemCreateEvent property instead.

Specifies the DOM events after which the UI component's value should be updated. Applies only if acceptCustomValue is set to true.

Type:

String

Default Value: 'change'

This property accepts a single event name or several names separated by spaces.

The recommended events are "keyup", "blur", "change", "input", and "focusout", but you can use other events as well.

See Also

valueExpr

Specifies which data field provides unique values to the UI component's value.

Type:

String

|

Function

Function parameters:
item:

Object

The current item's data object.

Return Value:

String

|

Number

|

Boolean

A unique item identifier.

Default Value: 'this'

View Demo

When dataSource contains objects, you should define valueExpr to correctly identify data items. Otherwise, the component uses referential equality to compare objects, which may result in unexpected behavior.

If you use a store, the valueExpr property should have the same value as the key in the store. Alternatively, you can use this as a valueExpr but the key should be specified. Refer to the following article for more information: Troubleshooting - A Drop-Down Editor Does Not Show Data.

Do not use template as a valueExpr value.

NOTE
You cannot specify valueExpr as a function when the UI component is bound to a remote data source. This is because valueExpr is used in a filter the UI component sends to the server when querying data. Functions with custom logic cannot be serialized for this filter.
See Also

visible

Specifies whether the UI component is visible.

Type:

Boolean

Default Value: true

width

Specifies the UI component's width.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The UI component's width.

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The width in pixels.

  • String
    A CSS-accepted measurement of width. For example, "55px", "20vw", "80%", "auto", "inherit".

  • Function (deprecated since v21.2)
    Refer to the W0017 warning description for information on how you can migrate to viewport units.

wrapItemText

Specifies whether text that exceeds the drop-down list width should be wrapped.

Type:

Boolean

Default Value: false