JavaScript/jQuery TextBox Methods

This section describes the members used to manipulate the UI component.

beginUpdate()

Prevents the UI component from refreshing until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods prevent the UI component from excessive updates when you are changing multiple UI component settings at once. After the beginUpdate() method is called, the UI component does not update its UI until the endUpdate() method is called.

blur()

Removes focus from the input element.

jQuery

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Angular

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Vue

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React

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focus

defaultOptions(rule)

Specifies the device-dependent default configuration properties for this component.

Parameters:

rule:

Object

The component's default device properties.

Object structure:

Name	Type	Description
device	Device \| Array<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

|

Array<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 TextBox UI component in an application executed on the desktop.

jQuery

JavaScript

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

Angular

TypeScript

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

Vue

<template>
    <div>
        <DxTextBox id="textBox1" />
        <DxTextBox id="textBox2" />
    </div>
</template>
<script>
import DxTextBox from "devextreme-vue/text-box";
import TextBox from "devextreme/ui/text_box";

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

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

React

import dxTextBox from "devextreme/ui/text_box";
import TextBox from "devextreme-react/text-box";

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

export default function App() {
    return (
        <div>
            <TextBox id="textBox1" />
            <TextBox id="textBox2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the TextBox instance.

jQuery

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

JavaScript

$("#myTextBox").dxTextBox("dispose");
$("#myTextBox").remove();

Angular

Use conditional rendering instead of this method:

app.component.html

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

Vue

Use conditional rendering instead of this method:

App.vue

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

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

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

React

Use conditional rendering instead of this method:

App.js

import React from 'react';

import TextBox from 'devextreme-react/text-box';

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

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

class App extends React.Component {
    render() {
        return (
            <DxTextBox 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

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Angular

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Vue

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React

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endUpdate()

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

Main article: beginUpdate()

jQuery

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Angular

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Vue

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React

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focus()

Sets focus to the input element representing the UI component.

jQuery

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Angular

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Vue

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React

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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 = $("#textBoxContainer").dxTextBox("getButton", "myCustomButton");
myCustomButton.focus();

Angular

app.component.ts

app.component.html

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

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

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

<dx-text-box #textBoxRef ... >
</dx-text-box>

Vue

App.vue

<template>
    <DxTextBox ...
        :ref="textBoxRef">
    </DxTextBox>
</template>

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

import DxTextBox from 'devextreme-vue/text-box';

export default {
    components: {
        DxTextBox
    },

    data() {
        return {
            textBoxRef
        }
    },

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

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

React

App.js

import React from 'react';

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

import TextBox from 'devextreme-react/text-box';

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

        this.textBoxRef = React.createRef();

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

    get textBox() {
        return this.textBoxRef.current.instance;
    }

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

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 TextBox instance found in an element with the myTextBox ID:

// Modular approach
import TextBox from "devextreme/ui/text_box";
...
let element = document.getElementById("myTextBox");
let instance = TextBox.getInstance(element) as TextBox;

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