Angular SelectBox Properties

See Also

View Demo

See Also

• Create a User-Defined Item

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

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.

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

View Demo

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:

  • DevExtreme.AspNet.Data
  • DevExtreme-PHP-Data
  • devextreme-query-mongodb

  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.

View Demo

View Demo

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

• valueExpr

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.

View Demo

See Also

• Custom Templates

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

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 text property.

$(function() {
    $("#selectBox").dxSelectBox({
        // ...
        fieldTemplate(data, container) {
            container.append(
                $('<div>').dxTextBox({
                    text: data.Category + ": " + data.Name,
                    readOnly: true
                })
            )
        },
    });
});

<dx-select-box ...
    fieldTemplate="field"
>
    <div *dxTemplate="let data of 'field'">
        <div>
            <dx-text-box 
                text="{{ data && data.Category + ': ' + data.Name }}" 
                [readOnly]="true"
            >
            </dx-text-box>
        </div>
    </div>
</dx-select-box>

<template>
    <DxSelectBox ...
        field-template="field"
    >
        <template #field="{ data }">
            <DxTextBox 
                :text="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>

import React from "react";
import SelectBox from "devextreme-react/select-box";
import TextBox from "devextreme-react/text-box";

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

export default App;

View Demo

See Also

• Customize Item Appearance
• Custom Templates

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

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.

SelectBox Demo TagBox Demo

See Also

• SelectBox - Grouping
• TagBox - Grouping

View Demo

See Also

• Customize Group Headers
• Custom Templates

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.

See Also

• Knockout Only - Validate a View Model
• validationErrors

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:

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.

View Demo

View Demo

See Also

• Customize Item Appearance
• Custom Templates

See Also

• labelMode
• placeholder

This property can have one of the following values:

labelMode	Description	Illustration
"static"	The label is displayed above the input field.
"floating"	The label is used as a placeholder, but when the editor gets focus, the label moves to the position above the input field.
"hidden"	The label is hidden.

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.

View Demo

See Also

• showDataBeforeSearch

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

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.

If data displayed by the UI component is specified using a DataSource instance, the contentReady event fires each time the load() method of the DataSource instance is called as well as when UI component content is ready. In this case, when you create the UI component, the contentReady event is raised twice: when the UI component's content is ready (at this moment, the UI component does not display items) and when the DataSource is loaded (the UI component displays the loaded items).

View Demo

See Also

• Create a User-Defined Item

See Also

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

$(function() {
    $("#selectBoxContainer").dxSelectBox({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});

<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 { }  

<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> 

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}
        />        
    ); 
} 

View Demo

See Also

• valueChangeEvent

See Also

• showDropDownButton

View Demo

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

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.

DevExpress.config({
    rtlEnabled: true
});

DataGrid Demo Navigation UI Demo Editors Demo

View Demo

See Also

• Configure Search Parameters

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.

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

View Demo

View Demo

The Clear button calls the reset method.

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

See Also

• dropDownButtonTemplate

The following styles are available:

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

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

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.

See Also

• isValid

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.

The following table illustrates the validation status indicators:

validationStatus	Indicator
"pending"
"valid"
"invalid"

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

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

    function setInvalidStatus(message) {
        selectBox.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});

<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 }];
    }
}

<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>

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;

See Also

• label

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

• onValueChanged

View Demo

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

If you use a store, the valueExpr property should have the same value as the key in the store.

Do not use template as a valueExpr value.

See Also

• displayExpr

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.