Methods

This section describes members used to manipulate the UI component.

See Also

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.

See Also

content()

Gets the UI component's content.

Return Value:

HTMLElement | jQuery

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

See Also

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 specifying 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 LoadPanel UI component in an application executed on the desktop.

jQuery
JavaScript
DevExpress.ui.dxLoadPanel.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the LoadPanel properties
    }
});
Angular
TypeScript
import LoadPanel from "devextreme/ui/load_panel";
// ...
export class AppComponent {
    constructor () {
        LoadPanel.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the LoadPanel properties
            }
        });
    }
}
Vue
<template>
    <div>
        <DxLoadPanel id="loadPanel1" />
        <DxLoadPanel id="loadPanel2" />
    </div>
</template>
<script>
import DxLoadPanel from "devextreme-vue/load-panel";
import LoadPanel from "devextreme/ui/load_panel";

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

export default {
    components: {
        DxLoadPanel
    }
}
</script>
React
import React from "react";
import dxLoadPanel from "devextreme/ui/load_panel";
import LoadPanel from "devextreme-react/load-panel";

class App extends React.Component {
    render () {
        dxLoadPanel.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the LoadPanel properties
            }
        })
        return (
            <div>
                <LoadPanel id="loadPanel1" />
                <LoadPanel id="loadPanel2" />
            </div>
        )
    }
}

export default App;

dispose()

Disposes of all the resources allocated to the LoadPanel instance.

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

JavaScript
$("#myLoadPanel").dxLoadPanel("dispose");
$("#myLoadPanel").remove();

Use this method only if the UI component was created with jQuery or pure JavaScript. In Angular, Vue, and React, use conditional rendering:

Angular
app.component.html
<dx-load-panel ...
    *ngIf="condition">
</dx-load-panel>
Vue
App.vue
<template>
    <DxLoadPanel ...
        v-if="condition">
    </DxLoadPanel>
</template>

<script>
import DxLoadPanel from 'devextreme-vue/load-panel';

export default {
    components: {
        DxLoadPanel
    }
}
</script>
React
App.js
import React from 'react';

import LoadPanel from 'devextreme-react/load-panel';

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

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

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

element()

Gets the root UI component element.

Return Value:

HTMLElement | jQuery

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

See Also

endUpdate()

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

Main article: beginUpdate()

See Also

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 LoadPanel instance found in an element with the myLoadPanel ID:

// Modular approach
import LoadPanel from "devextreme/ui/load_panel";
...
let element = document.getElementById("myLoadPanel");
let instance = LoadPanel.getInstance(element) as LoadPanel;

// Non-modular approach
let element = document.getElementById("myLoadPanel");
let instance = DevExpress.ui.dxLoadPanel.getInstance(element);
See Also

hide()

Hides the UI component.

Return Value:

Promise<Boolean> (jQuery or native)

A Promise that is resolved after the UI component is hidden. It is a native Promise or a jQuery.Promise when you use jQuery.

Popup Demo

See Also

instance()

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

Return Value:

LoadPanel

This UI component's instance.

See Also

off(eventName)

Detaches all event handlers from a single event.

Parameters:
eventName:

String

The event's name.

Return Value:

LoadPanel

The object for which this method is called.

See Also

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

LoadPanel

The object for which this method is called.

See Also

on(eventName, eventHandler)

Subscribes to an event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

LoadPanel

The object for which this method is called.

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

See Also

on(events)

Subscribes to events.

Parameters:
events:

Object

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

Return Value:

LoadPanel

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.

See Also

option()

Return Value:

Object

The UI component's properties.

See Also

option(optionName)

Gets the value of a single property.

Parameters:
optionName:

String

The property's name or full path.

Return Value: any

This property's value.

See Also

option(optionName, optionValue)

Updates the value of a single property.

Parameters:
optionName:

String

The property's name or full path.

optionValue: any

This property's new value.

See Also

option(options)

Updates the values of several properties.

Parameters:
options:

Object

Options with their new values.

See Also

repaint()

Recalculates the UI component's size and position without rerendering.

See Also

resetOption(optionName)

Resets an property to its default value.

Parameters:
optionName:

String

An property's name.

See Also

show()

Shows the UI component.

Return Value:

Promise<Boolean> (jQuery or native)

A Promise that is resolved after the UI component is shown. It is a native Promise or a jQuery.Promise when you use jQuery.

toggle(showing)

Shows or hides the UI component depending on the argument.

Parameters:
showing:

Boolean

Specifies whether to show or hide the UI component.

Return Value:

Promise<Boolean> (jQuery or native)

A Promise that is resolved with true if the UI component is shown or false if it is hidden. It is a native Promise or a jQuery.Promise when you use jQuery.

You can use this method instead of the show() and hide() methods. In this case, pass true or false as the method parameter to show or hide the UI component.

See Also