Name	Type	Description
device	Device \| Function	Device parameters. When you specify a function, get information about the current device from the argument. Return true if the properties should be applied to the device.
options	Object	Options to be applied.

Name

Type

Description

device

Device

|

Function

Device parameters.
When you specify a function, get information about the current device from the argument. Return true if the properties should be applied to the device.

options

Object

Options to be applied.

defaultOptions is a static method that the UI component class supports. The following code demonstrates how to specify default properties for all instances of the SelectBox UI component in an application executed on the desktop.

jQuery

JavaScript

DevExpress.ui.dxSelectBox.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the SelectBox properties
    }
});

Angular

TypeScript

import SelectBox, { Properties } from "devextreme/ui/select_box";
// ...
export class AppComponent {
    constructor () {
        SelectBox.defaultOptions<Properties>({
            device: { deviceType: "desktop" },
            options: {
                // Here go the SelectBox properties
            }
        });
    }
}

Vue

<template>
    <div>
        <DxSelectBox id="selectBox1" />
        <DxSelectBox id="selectBox2" />
    </div>
</template>
<script>
import DxSelectBox from "devextreme-vue/select-box";
import SelectBox from "devextreme/ui/select_box";

SelectBox.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the SelectBox properties
    }
});

export default {
    components: {
        DxSelectBox
    }
}
</script>

React

import dxSelectBox from "devextreme/ui/select_box";
import SelectBox from "devextreme-react/select-box";

dxSelectBox.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the SelectBox properties
    }
});

export default function App() {
    return (
        <div>
            <SelectBox id="selectBox1" />
            <SelectBox id="selectBox2" />
        </div>
    )
}

You can also set rules for multiple device types:

jQuery

JavaScript

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    DevExpress.ui.dxSelectBox.defaultOptions({ 
        device: deviceConfig,
        options: {
            // Here go the SelectBox properties
        }
    });
});

Angular

TypeScript

import SelectBox, { Properties } from "devextreme/ui/select_box";
// ...
export class AppComponent {
    constructor () {
        const devicesConfig = [
            { deviceType: 'desktop' },
            { deviceType: 'tablet' },
            { deviceType: 'phone' },
        ];

        devicesConfig.forEach(deviceConfig => {
            SelectBox.defaultOptions<Properties>({
                device: deviceConfig,
                options: {
                    // Here go the SelectBox properties
                }
            });
        });
    }
}

Vue

<template>
    <div>
        <DxSelectBox />
    </div>
</template>
<script>
import DxSelectBox from "devextreme-vue/select-box";
import SelectBox from "devextreme/ui/select_box";

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    SelectBox.defaultOptions({
        device: deviceConfig,
        options: {
            // Here go the SelectBox properties
        }
    });
});

export default {
    components: {
        DxSelectBox
    }
}
</script>

React

import dxSelectBox from "devextreme/ui/select_box";
import SelectBox from "devextreme-react/select-box";

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    dxSelectBox.defaultOptions({
        device: deviceConfig,
        options: {
            // Here go the SelectBox properties
        }
    });
});

export default function App() {
    return (
        <div>
            <SelectBox />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the SelectBox instance.

jQuery

After calling this method, remove the DOM element associated with the UI component:

JavaScript

$("#mySelectBox").dxSelectBox("dispose");
$("#mySelectBox").remove();

Angular

Use conditional rendering instead of this method:

app.component.html

<dx-select-box ...
    *ngIf="condition">
</dx-select-box>

Vue

Use conditional rendering instead of this method:

App.vue

<template>
    <DxSelectBox ...
        v-if="condition">
    </DxSelectBox>
</template>

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

export default {
    components: {
        DxSelectBox
    }
}
</script>

React

Use conditional rendering instead of this method:

App.js

import React from 'react';

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

function DxSelectBox(props) {
    if (!props.shouldRender) {
        return null;
    }

    return (
        <SelectBox ... >    
        </SelectBox>
    );
}

class App extends React.Component {
    render() {
        return (
            <DxSelectBox shouldRender="condition" />
        );
    }
}
export default App;

element()

Gets the root UI component element.

Return Value:

HTMLElement | jQuery

An HTML element or a jQuery element when you use jQuery.

jQuery

Call Methods

Angular

Call Methods

Vue

Call Methods

React

Call Methods

endUpdate()

Refreshes the UI component after a call of the beginUpdate() method.

The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.

jQuery

Call Methods

Angular

Call Methods

Vue

Call Methods

React

Call Methods

field()

Gets the UI component's <input> element.

Return Value:

HTMLElement | jQuery

An HTML element or a jQuery element when you use jQuery.

jQuery

Call Methods

Angular

Call Methods

Vue

Call Methods

React

Call Methods

focus()

Sets focus to the input element representing the UI component.

jQuery

Call Methods

Angular

Call Methods

Vue

Call Methods

React

Call Methods

getButton(name)

Gets an instance of a custom action button.

Parameters:

name:

String

The button's name.

Return Value:

Button

| undefined

The Button UI component's instance.

Use the returned button instance to call the Button UI component's methods, for example, focus():

jQuery

index.js

const myCustomButton = $("#selectBoxContainer").dxSelectBox("getButton", "myCustomButton");
myCustomButton.focus();

Angular

app.component.ts

app.component.html

import { Component, ViewChild } from '@angular/core';
import { DxSelectBoxComponent } from 'devextreme-angular';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    @ViewChild('selectBoxRef', { static: false }) selectBox: DxSelectBoxComponent;
    // Prior to Angular 8
    // @ViewChild('selectBoxRef') selectBox: DxSelectBoxComponent;

    setFocus() {
        this.selectBox.instance.getButton('myCustomButton').focus();
    }
}

<dx-select-box #selectBoxRef ... >
</dx-select-box>

Vue

App.vue

<template>
    <DxSelectBox ...
        :ref="selectBoxRef">
    </DxSelectBox>
</template>

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

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

export default {
    components: {
        DxSelectBox
    },

    data() {
        return {
            selectBoxRef
        }
    },

    methods: {
        setFocus() {
            this.selectBox.getButton('myCustomButton').focus();
        }
    },

    computed: {
        selectBox: function() {
            return this.$refs[selectBoxRef].instance;
        }
    }
}
</script>

React

App.js

import React from 'react';

import 'devextreme/dist/css/dx.light.css';

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

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

        this.selectBoxRef = React.createRef();

        this.setFocus = () => {
            this.selectBox.getButton('myCustomButton').focus();
        };
    }

    get selectBox() {
        return this.selectBoxRef.current.instance;
    }

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

getDataSource()

Gets the DataSource instance.

Return Value:

DataSource

The DataSource instance.

NOTE

This method returns the DataSource instance even if the UI component's dataSource property was given a simple array.

View on GitHub

jQuery

Call Methods

Angular

Call Methods

Vue

Call Methods

React

Call Methods

getInstance(element)

Gets the instance of a UI component found using its DOM node.

Parameters:

element:

Element

|

jQuery

The UI component's container.

Return Value:

Object

The UI component's instance.

getInstance is a static method that the UI component class supports. The following code demonstrates how to get the SelectBox instance found in an element with the mySelectBox ID:

// Modular approach
import SelectBox from "devextreme/ui/select_box";
...
let element = document.getElementById("mySelectBox");
let instance = SelectBox.getInstance(element) as SelectBox;

// Non-modular approach
let element = document.getElementById("mySelectBox");
let instance = DevExpress.ui.dxSelectBox.getInstance(element);