Methods in EJ2 TypeScript Linear gauge control

31 Aug 20237 minutes to read

The following methods are available in the Linear Gauge component.

setPointerValue

To change the pointer value dynamically, use the setPointerValue method in the Linear Gauge component. The following are the arguments for this method.

Argument name Description
axisIndex Specifies the index of the axis in which the pointer value is to be updated.
pointerIndex Specifies the index of the pointer to be updated.
pointerValue Specifies the value of the pointer to be updated. 
import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
    axes: [{
        pointers: [{
            value: 80
        }]
    }]
}, '#element');

document.getElementById('btn').onclick = () => {
    gauge.setPointerValue(0, 0, 30);
};
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'  style="margin-top: 20%;">
        <div id='element' style="margin-top: 20%;"></div>
        <button id="btn" type="button" width ='15%' style="float: right">Click me</button>
    </div>
</body>

</html>

setAnnotationValue

To change the annotation content dynamically, use the setAnnotationValue method in the Linear Gauge component. The following are the arguments for this method.

Argument name Description
annotationIndex Specifies the index number of the annotation to be updated.
content Specifies the text for the annotation to be updated.
axisValue Specifies the value of the axis where the annotation is to be placed. 
import { LinearGauge, Annotations } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(Annotations);
let gauge: LinearGauge = new LinearGauge({
    annotations: [{
       content: '10',
       zIndex: '1',
       axisValue: 0
    }]
}, '#element');

document.getElementById('btn').onclick = () => {
    gauge.setAnnotationValue(0, '50', 50);
};
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'  style="margin-top: 20%;">
        <div id='element' style="margin-top: 20%;"></div>
        <button id="btn" type="button" width ='15%' style="float: right">Click me</button>
    </div>
</body>

</html>

refresh

The refresh method can be used to change the state of the component and render it again.

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
    axes:[{
        pointers:[{
            value: 10
        }]
    }]
}, '#element');

document.getElementById('btn').onclick = () => {
    gauge.refresh();
};
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'  style="margin-top: 20%;">
        <div id='element' style="margin-top: 20%;"></div>
        <button id="btn" type="button" width ='15%' style="float: right">Click me</button>
    </div>
</body>

</html>