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Getting started with JavaScript Circular Gauge control

24 May 2022 / 3 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-svg-base
    |-- @syncfusion/ej2-pdf-export

Installation and Configuration

  • To get started with Circular Gauge control, clone the Essential JS 2 quickstart project from GitHub 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
  • Syncfusion Circular Gauge packages can 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' }
}
});

The project is preconfigured with common settings (system.config.js ) to start with all Essential JS 2 components.

Add Circular Gauge control to the Project

The Essential JS2 Circular Gauge control can be added to the application. To get started, add the Circular Gauge control to the app.ts and index.html files using the following code.

Add an HTML div element to act as the Circular Gauge element in the index.html file using the following code.

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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>

Import the Circular Gauge control in the app.ts to initialize the Circular Gauge and append the Circular 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

The quickstart project is configured to compile and run the application in the browser. Use the following command to run the application.

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npm start

The below example shows a basic Circular Gauge control.

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/ej2/20.1.57/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/ej2/20.1.57/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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