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Getting Started

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

Dependencies

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

+-- @syncfusion/ej2-react-lineargauge
|-- @syncfusion/ej2-lineargauge
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-popups
        |-- @syncfusion/ej2-buttons
|-- @syncfusion/ej2-react-base

Installation and configuration

You can use create-react-app to setup the applications. To install create-react-app run the following command.

npm install -g create-react-app
  • To setup basic React sample use following commands.
create-react-app quickstart --scripts-version=react-scripts-ts

cd quickstart

npm install
  • Install Syncfusion packages using below command.
npm install @syncfusion/ej2-react-lineargauge --save

Add Linear Gauge to the Project

Now, you can start adding LinearGauge component in the application. For getting started, add the LinearGauge component in src/App.tsx file using following code.

import * as React from 'react';
import { LinearGaugeComponent } from '@syncfusion/ej2-react-lineargauge';

class App extends React.Component {
render() {
   return (<LinearGaugeComponent></LinearGaugeComponent>);
  }
}
export default App;

Module Injection

Linear gauge component are segregated into individual feature-wise modules. In order to use a particular feature, you need to inject its feature service in the AppModule. In the current application, we are going to modify the above basic chart to visualize sales data for a particular year. For this application we are going to use line series, tooltip, data label, category axis and legend feature of the chart. Please find the relevant feature service name and description as follows.

  • Annotations - Inject this module in to services to use annotation feature.
  • GaugeTooltip - Inject this module in to services to use tooltip feature.

These modules should be injected to the services section as follows,

import * as React from "react";
import * as ReactDOM from "react-dom";
import { LinearGaugeComponent, Annotations, GaugeTooltip} from '@syncfusion/ej2-react-lineargauge';

ReactDOM.render(<LinearGaugeComponent id='gauge'></LinearGaugeComponent>,
<Inject services={[Annotations, GaugeTooltip]}/>
document.getElementById('gauge'));

Add Gauge Title

You can add a title using title property to the linear gauge to provide quick information to the user.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { LinearGaugeComponent } from '@syncfusion/ej2-react-lineargauge';

ReactDOM.render(
    <LinearGaugeComponent id='gauge' title='Linear Gauge'>
    </LinearGaugeComponent>,document.getElementById('gauge'));

Axis Range

You can set the range to the axis using minimum and maximum properties.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { LinearGaugeComponent, AxesDirective, AxisDirective } from '@syncfusion/ej2-react-lineargauge';

ReactDOM.render(
    <LinearGaugeComponent id='gauge'>
        <AxesDirective>
            <AxisDirective minimum={0} maximum={200}>
            </AxisDirective>
        </AxesDirective>
    </LinearGaugeComponent>,document.getElementById('gauge'));

To denote the axis values with temperature units, we can add °C as suffix to each label. This can be achieved by setting the {value}°C to the format property of labelStyle in the axis. Here, {value} acts as a placeholder for each axis label.

You can change the pointer value from the default value of the gauge by settings the value property in pointers option in axis.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { LinearGaugeComponent, AxesDirective, AxisDirective, PointersDirective, PointerDirective, RangesDirective, RangeDirective } from '@syncfusion/ej2-react-lineargauge';

ReactDOM.render(
    <LinearGaugeComponent id='gauge'>
        <AxesDirective>
            <AxisDirective minimum={0} maximum={200} labelStyle={ { format:'{value}°C' } }>
                <PointersDirective>
                    <PointerDirective value={140}>
                    </PointerDirective>
                </PointersDirective>
                <RangesDirective>
                    <RangeDirective start={0} end={80} startWidth={15} endWidth={15}>
                    </RangeDirective>
                    <RangeDirective start={80} end={120} startWidth={15} endWidth={15}>
                    </RangeDirective>
                    <RangeDirective start={120} end={140} startWidth={15} endWidth={15}>
                    </RangeDirective>
                    <RangeDirective start={140} end={200} startWidth={15} endWidth={15}>
                    </RangeDirective>
                </RangesDirective>
            </AxisDirective>
        </AxesDirective>
    </LinearGaugeComponent>,document.getElementById('gauge'));

Set Pointer Value

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

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { LinearGaugeComponent, AxesDirective, AxisDirective, PointersDirective, PointerDirective } from '@syncfusion/ej2-react-lineargauge';

ReactDOM.render(
    <LinearGaugeComponent id='gauge'>
        <AxesDirective>
            <AxisDirective minimum={0} maximum={200}>
                <PointersDirective>
                    <PointerDirective value={140} color='green'>
                    </PointerDirective>
                </PointersDirective>
            </AxisDirective>
        </AxesDirective>
    </LinearGaugeComponent>,document.getElementById('gauge'));
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