JavaScript/jQuery Bullet Methods

This section describes the methods that can be used in code to manipulate objects related to the Bullet 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

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Angular

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Vue

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React

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dispose()

Disposes of all the resources allocated to the Bullet instance.

jQuery

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

JavaScript

$("#myBullet").dxBullet("dispose");
$("#myBullet").remove();

Angular

Use conditional rendering instead of this method:

app.component.html

<dx-bullet ...
    *ngIf="condition">
</dx-bullet>

Vue

Use conditional rendering instead of this method:

App.vue

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

<script>
import DxBullet from 'devextreme-vue/bullet';

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

React

Use conditional rendering instead of this method:

App.js

import React from 'react';

import Bullet from 'devextreme-react/bullet';

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

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

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

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Angular

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Vue

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React

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exportTo(fileName, format)

Exports the UI component.

Parameters:

fileName:

String

The name of the file to which the UI component is about to be exported.

format:

String

The file's format. One of 'PNG', 'PDF', 'JPEG', 'SVG' and 'GIF'.
PNG is used if the browser does not support exporting to the specified format.

getInstance(element)

Gets the instance of a UI component found using its DOM node.

Parameters:

element:

DOM Node

|

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 Bullet instance found in an element with the myBullet ID:

// Modular approach
import Bullet from "devextreme/viz/bullet";
...
let element = document.getElementById("myBullet");
let instance = Bullet.getInstance(element) as Bullet;

// Non-modular approach
let element = document.getElementById("myBullet");
let instance = DevExpress.viz.dxBullet.getInstance(element);