React Gallery Methods

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.

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 properties should be applied to the device.

options

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 Gallery UI component in an application executed on the desktop.

jQuery

JavaScript

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

Angular

TypeScript

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

Vue

<template>
    <div>
        <DxGallery id="gallery1" />
        <DxGallery id="gallery2" />
    </div>
</template>
<script>
import DxGallery from "devextreme-vue/gallery";
import Gallery from "devextreme/ui/gallery";

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

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

React

import React, {useEffect} from "react";
import dxGallery from "devextreme/ui/gallery";
import Gallery from "devextreme-react/gallery";

export default function App() {
    useEffect(() => { 
        dxGallery.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the Gallery properties
            }
        })
    });

    return (
        <div>
            <Gallery id="gallery1" />
            <Gallery id="gallery2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the Gallery instance.

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

JavaScript

$("#myGallery").dxGallery("dispose");
$("#myGallery").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-gallery ...
    *ngIf="condition">
</dx-gallery>

Vue

App.vue

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

<script>
import DxGallery from 'devextreme-vue/gallery';

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

React

App.js

import React from 'react';

import Gallery from 'devextreme-react/gallery';

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

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

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

endUpdate()

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

Main article: beginUpdate()

focus()

Sets focus on the UI component.

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.

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:

The UI component's instance.

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

// Modular approach
import Gallery from "devextreme/ui/gallery";
...
let element = document.getElementById("myGallery");
let instance = Gallery.getInstance(element) as Gallery;

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

goToItem(itemIndex, animation)

Shows a specific image.

Parameters:

itemIndex:

Number

The index of the image in the dataSource.

animation:

Boolean

Specifies whether switching to the image should be animated.

Return Value:

Promise<void> (jQuery or native)

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

instance()

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

Return Value:

This UI component's instance.

nextItem(animation)

Shows the next image.

Parameters:

animation:

Boolean

Specifies whether switching to the image should be animated.

Return Value:

Promise<void> (jQuery or native)

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

If the current item is the last item in the gallery, the method behavior depends on the loop property value. If loop is set to true, the first item is shown. Otherwise, the method does nothing.

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.

option()

Gets all UI component properties.

Return Value:

The UI component's properties.

option(optionName)

Gets the value of a single property.

Parameters:

optionName:

The property's name or full path.

Return Value: any

This property's value.

option(optionName, optionValue)

Updates the value of a single property.

Parameters:

optionName:

The property's name or full path.

optionValue: any

This property's new value.

option(options)

Updates the values of several properties.

Parameters:

options:

Options with their new values.

prevItem(animation)

Shows the previous image.

Parameters:

animation:

Boolean

Specifies whether switching to the image should be animated.

Return Value:

Promise<void> (jQuery or native)

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

If the current item is the first item in the gallery, the method behavior depends on the loop property value. If loop is set to true, the last item is shown. Otherwise, the method does nothing.

registerKeyHandler(key, handler)

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

Parameters:

key:

A key.

handler:

A handler. Accepts the keydown event as the argument. It is a EventObject or a jQuery.Event when you use jQuery.

The key argument accepts one of the following values:

"backspace"
"tab"
"enter"
"escape"
"pageUp"
"pageDown"
"end"
"home"
"leftArrow"
"upArrow"
"rightArrow"
"downArrow"
"del"
"space"
"F"
"A"
"asterisk"
"minus"

A custom handler for a key cancels the default handler for this key.

repaint()

Repaints the UI component without reloading data. Call it to update the UI component's markup.

resetOption(optionName)

Resets a property to its default value.

Parameters:

optionName: