JavaScript/jQuery SelectBox Methods

The component's default device options.

Object structure:

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

Name

Type

Description

device

Device

|

Array<Device>

|

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

options

Options to be applied.

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

jQuery

JavaScript

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

Angular

TypeScript

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

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 options
    }
});

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

React

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

class App extends React.Component {
    render () {
        dxSelectBox.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the SelectBox options
            }
        })
        return (
            <div>
                <SelectBox id="selectBox1" />
                <SelectBox id="selectBox2" />
            </div>
        )
    }
}

export default App;

dispose()

Disposes of all the resources allocated to the SelectBox instance.

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

jQuery

JavaScript

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

Angular

HTML

<dx-select-box #selectBoxVar id="mySelectBox"></dx-select-box>

TypeScript

import { ..., ViewChild } from "@angular/core";
import { DxSelectBoxComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild("selectBoxVar", { static: false }) selectBox: DxSelectBoxComponent;
    // Prior to Angular 8
    // @ViewChild("selectBoxVar") selectBox: DxSelectBoxComponent;

    removeSelectBox (e) {
        this.selectBox.instance.dispose();
        document.getElementById("mySelectBox").remove();
    }
}

element()

Gets the root widget element.

Return Value:

HTMLElement | jQuery

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

endUpdate()

Refreshes the widget after a call of the beginUpdate() method.

Main article: beginUpdate()

field()

Gets the widget's <input> element.

Return Value:

HTMLElement | jQuery

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

focus()

Sets focus to the input element representing the widget.

getButton(name)

Gets an instance of a custom action button.

Parameters:

name:

The button's name.

Return Value:

Button

| undefined

The Button widget's instance.

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

jQuery

index.js

var 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.common.css';
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.common.css';
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 widget's dataSource option was given a simple array.

getInstance(element)

Gets the instance of a widget found using its DOM node.

Parameters:

element:

DOM Node

|

jQuery

The widget's container.

Return Value:

The widget's instance.

getInstance is a static method that the widget 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);

instance()

Gets the widget's instance. Use it to access other methods of the widget.

Return Value:

This widget's instance.

off(eventName)

Detaches all event handlers from a single event.

Parameters:

eventName:

The event's name.

Return Value:

The object for which this method is called.

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

Parameters:

eventName:

The event's name.

eventHandler:

The event's handler.

Return Value:

The object for which this method is called.

on(eventName, eventHandler)

Subscribes to an event.

Parameters:

eventName:

The event's name.

eventHandler:

The event's handler.

Return Value:

The object for which this method is called.

Use this method to subscribe to one of the events listed in the Events section.

on(events)

Subscribes to events.

Parameters:

events:

Events with their handlers: { "eventName1": handler1, "eventName2": handler2, ...}

Return Value:

The object for which this method is called.

Use this method to subscribe to several events with one method call. Available events are listed in the Events section.

open()

Opens the drop-down editor.

option()

Gets all widget options.

Return Value:

The widget's options.

option(optionName)

Gets the value of a single option.

Parameters:

optionName:

The option's name or full path.

Return Value: any

This option's value.

option(optionName, optionValue)

Updates the value of a single option.

Parameters:

optionName:

The option's name or full path.

optionValue: any

This option's new value.

option(options)

Updates the values of several options.

Parameters:

options:

Options with their new values.

registerKeyHandler(key, handler)

Registers a handler to be executed when a user presses a specific key.

Parameters:

key:

A key.

handler: