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Getting started with JavaScript Circular Gauge control

08 Apr 2021 / 2 minutes to read

This section explains you the steps required to create a simple circular gauge and demonstrate the basic usage of the circular gauge control.

Dependencies

Below is the list of minimum dependencies required to use the circular gauge.

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|-- @syncfusion/ej2-circulargauge
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-buttons
    |-- @syncfusion/ej2-popups

Installation and Configuration

  • To get you started with circular gauge component, you can clone the Essential JS 2 quickstart project and install necessary packages by using the following commands.
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git clone https://github.com/syncfusion/ej2-quickstart.git quickstart
cd quickstart
npm install
  • CircularGauge packages need to be mapped in system.config.js configuration files.
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System.config({
paths: {
    'syncfusion:': './node_modules/@syncfusion/',
},
map: {
    app: 'app',

    //Syncfusion packages mapping
    "@syncfusion/ej2-base": "syncfusion:ej2-base/dist/ej2-base.umd.min.js",
    "@syncfusion/ej2-buttons": "syncfusion:ej2-buttons/dist/ej2-buttons.umd.min.js",
    "@syncfusion/ej2-popups": "syncfusion:ej2-popups/dist/ej2-popups.umd.min.js",
    "@syncfusion/ej2-circulargauge": "syncfusion:ej2-circulargauge/dist/ej2-circulargauge.umd.min.js",
},
packages: {
    'app': { main: 'app', defaultExtension: 'js' }
}
});

Add Circular Gauge to the Project

Add the HTML div element for CircularGauge into your index.html. [src/index.html]

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<!DOCTYPE html>
<html lang="en">

<head>
<title>EJ2 Circular Gauge</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" />
<!--style reference from app-->
<link href="/styles/styles.css" rel="stylesheet" />
<!--system js reference and configuration-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<script src="systemjs.config.js"></script>
</head>

<body>
 <!--container which is going to render the Circular gauge-->
 <div id='container'>
 </div>
</body>

</html>

Now import the circular gauge component into your index.ts to instantiate a gauge and append the gauge instance to the #container

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import { CircularGauge } from '@syncfusion/ej2-circulargauge';

// initialize CircularGauge component
let gauge: CircularGauge = new CircularGauge();

// render initialized CircularGauge
gauge.appendTo('#container');

Run the application

Now use the npm run start command to run the application in the browser.

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npm run start

The below example shows a basic circular gauge component.

Source
Preview
index.ts
index.html
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import { CircularGauge } from '@syncfusion/ej2-circulargauge';

let gauge: CircularGauge = new CircularGauge();
gauge.appendTo('#element');
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<!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" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Set Pointer Value

You can change the pointer value in the above sample using value property in pointers.

Source
Preview
index.ts
index.html
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import { CircularGauge } from '@syncfusion/ej2-circulargauge';
let gauge: CircularGauge = new CircularGauge({
axes:[{
    pointers:[{
        value: 35
        }],
    }]
}, '#element');
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<!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" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
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