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Threshold in Chart in JavaScript Chart control

You can mark a threshold in chart by using the stripline.

To mark a threshold in chart, follow the given steps:

Step 1:

By using the start and end properties of striplines object in vertical axis, you can mark the threshold for y values of the series.

Source
Preview
index.ts
index.html
import { Chart, LineSeries, Category, Legend, Tooltip, ILoadedEventArgs, StripLine, ChartTheme } from '@syncfusion/ej2-charts';
Chart.Inject(LineSeries, Category, Legend, Tooltip, StripLine);
    let chart: Chart = new Chart({
        //Initializing Primary X Axis
        primaryXAxis: {
            valueType: 'Category',
        },
        //Initializing Primary Y Axis
        primaryYAxis:
        {
            minimum: 10, maximum: 40, interval: 5,
            lineStyle: { color: '#808080' }, labelFormat: '{value} °C', rangePadding: 'None',
            //Initializing Striplines
            stripLines: [
                {
                    start: 30, end: 30.1, color: '#ff512f', visible: true,
                    textStyle: { size: '18px', color: '#ffffff', fontWeight: '600' },
                }
            ]
        },
        //Initializing Chart Series
        series: [
            {
                dataSource: [
                    { x: 'Sun', y: 28 }, { x: 'Mon', y: 27 }, { x: 'Tue', y: 33 }, { x: 'Wed', y: 36 },
                    { x: 'Thu', y: 28 }, { x: 'Fri', y: 30 }, { x: 'Sat', y: 31 }],
                xName: 'x', width: 2, yName: 'y',  type: 'Line', name: 'Weather',
                marker: { visible: true, width: 10, height: 10, border: { width: 2, color: '#ffffff' }, fill: '#666666' },
            },
        ],
        legendSettings: { visible: false },
        //Initializing Chart Title
        title: 'Weather Report',
        width:'650px',
        height: '350px'
    });
    chart.appendTo('#element');
<!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="http://npmci.syncfusion.com/packages/development/material.css" rel="stylesheet">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.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 class="col-sm-8">
            <div class="row">
                <div class="col-sm-4">  
                  <div id='container'>
                    <div id='element'  style="width:350px; height:350px;float:left">
                    </div>
                    <label id="lbl"></label>
                  </div>
                </div>
                <div class="col-sm-4" style="width:200px; height:350px;float: right">
                  <div id='Grid'>
                  </div>
                </div>
            </div>
    </div>
</body> 
</html>