React ProgressBar Methods

This section describes members used to manipulate the UI component.

beginUpdate()

Postpones rendering that can negatively affect performance until the endUpdate() method is called.

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

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React

Call Methods

clear()

Resets the value property to the default value.

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 \| 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 ProgressBar UI component in an application executed on the desktop.

jQuery

JavaScript

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

Angular

TypeScript

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

Vue

<template>
    <div>
        <DxProgressBar id="progressBar1" />
        <DxProgressBar id="progressBar2" />
    </div>
</template>
<script>
import DxProgressBar from "devextreme-vue/progress-bar";
import ProgressBar from "devextreme/ui/progress_bar";

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

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

React

import dxProgressBar from "devextreme/ui/progress_bar";
import ProgressBar from "devextreme-react/progress-bar";

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

export default function App() {
    return (
        <div>
            <ProgressBar id="progressBar1" />
            <ProgressBar id="progressBar2" />
        </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.dxProgressBar.defaultOptions({ 
        device: deviceConfig,
        options: {
            // Here go the ProgressBar properties
        }
    });
});

Angular

TypeScript

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

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

Vue

<template>
    <div>
        <DxProgressBar />
    </div>
</template>
<script>
import DxProgressBar from "devextreme-vue/progress-bar";
import ProgressBar from "devextreme/ui/progress_bar";

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

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

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

React

import dxProgressBar from "devextreme/ui/progress_bar";
import ProgressBar from "devextreme-react/progress-bar";

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

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

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

dispose()

Disposes of all the resources allocated to the ProgressBar instance.

jQuery

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

JavaScript

$("#myProgressBar").dxProgressBar("dispose");
$("#myProgressBar").remove();

Angular

Use conditional rendering instead of this method:

app.component.html

<dx-progress-bar ...
    *ngIf="condition">
</dx-progress-bar>

Vue

Use conditional rendering instead of this method:

App.vue

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

<script>
import DxProgressBar from 'devextreme-vue/progress-bar';

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

React

Use conditional rendering instead of this method:

App.js

import React from 'react';

import ProgressBar from 'devextreme-react/progress-bar';

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

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

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

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

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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 ProgressBar instance found in an element with the myProgressBar ID:

// Modular approach
import ProgressBar from "devextreme/ui/progress_bar";
...
let element = document.getElementById("myProgressBar");
let instance = ProgressBar.getInstance(element) as ProgressBar;

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