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User Interaction in JavaScript Linear Gauge control

22 Oct 2021 / 3 minutes to read

Tooltip

Linear gauge displays the details about a pointer value through tooltip, when the mouse hovers over the pointer. To enable the tooltip, set the enable property to true and inject the GaugeTooltip module in Linear Gauge.

Source
Preview
index.ts
index.html
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import { LinearGauge, GaugeTooltip } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(GaugeTooltip);
let gauge: LinearGauge = new LinearGauge({
   tooltip: {
       enable: true
   },
   axes: [{
        pointers: [{
            value: 80
        }]
    }]
}, '#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-lineargauge/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>

Tooltip Format

Tooltip in the Linear Gauge control can be formatted using the format property in tooltip object. It is used to render the tooltip in certain format or to add a user-defined unit in the tooltip. By default, the tooltip shows the pointer value only. In addition to that, more information can be added in the tooltip. For example, the format {value}km shows pointer value with kilometer unit in the tooltip.

Source
Preview
index.ts
index.html
Copied to clipboard
import { LinearGauge, GaugeTooltip } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(GaugeTooltip);
let gauge: LinearGauge = new LinearGauge({
    tooltip: {
       enable: true,
       format: '{value}km'
   },
   axes: [{
        pointers: [{
            value: 80
        }]
    }]
}, '#element');
Copied to clipboard
<!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-lineargauge/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>

Tooltip Template

The HTML element can be rendered in the tooltip of the Linear Gauge using the template property in the tooltip . The ${value} can be used as placeholders in the HTML element to display the pointer values of the corresponding axis.

Source
Preview
index.ts
index.html
Copied to clipboard
import { LinearGauge, GaugeTooltip } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(GaugeTooltip);
let gauge: LinearGauge = new LinearGauge({
    tooltip: {
            enable: true,
            //tooltip template for Linear gauge
            template: '<div>Pointer: 80 </div>'
        },
        axes: [{
            pointers: [{
                value: 80
            }]
        }]
}, '#element');
Copied to clipboard
<!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-lineargauge/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>

Customize the appearance of the tooltip

The tooltip can be customized using the following properties in tooltip.

  • fill - To fill the color for tooltip.
  • enableAnimation - To enable or disable the tooltip animation.
  • border - To set the border color and width of the tooltip.
  • textStyle - To customize the style of the text in tooltip.
  • showAtMousePosition - To show the tooltip at the mouse position.
Source
Preview
index.ts
index.html
Copied to clipboard
import { LinearGauge, GaugeTooltip } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(GaugeTooltip);
let gauge: LinearGauge = new LinearGauge({
tooltip: {
        enable: true,
        fill: '#e5bcbc',
        border: {
            color: '#d80000',
            width: 2
        }
    },
    axes: [{
        pointers: [{
            value: 80
        }]
    }]
}, '#element');
Copied to clipboard
<!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-lineargauge/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>

Positioning the tooltip

The tooltip is positioned at the End of the pointer. To change the position of the tooltip at the start, or center of the pointer, set the position property to Start or Center.

Source
Preview
index.ts
index.html
Copied to clipboard
import { LinearGauge, GaugeTooltip } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(GaugeTooltip);
let gauge: LinearGauge = new LinearGauge({
tooltip: {
    enable: true,
    position: "Center"
},
axes: [{
    pointers: [{
        type: 'Bar',
        value: 50,
        offset: -50,
        color: "red"
    }],
    majorTicks: {
        interval: 10
    },
    minorTicks: {
        interval: 2
    },
    labelStyle: {
        offset: 48
    }
}],
}, '#element');
Copied to clipboard
<!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-lineargauge/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>

Pointer Drag

To drag either the marker or bar pointer to the desired axis value, set the enableDrag property as true in the pointer.

Source
Preview
index.ts
index.html
Copied to clipboard
import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 80,
        enableDrag: true
    }]
}]
}, '#element');
Copied to clipboard
<!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-lineargauge/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>