Trend lines in EJ2 JavaScript Chart control

8 May 202324 minutes to read

Trendlines are used to show the direction and speed of price.

Trendlines can be generated for Cartesian type series (Line, Column, Scatter, Area, Candle, Hilo etc.) except bar type series. You can add more than one trendline to a series.

Chart supports 6 types of trendlines.

Linear

A linear trendline is a best fit straight line that is used with simpler data sets. To render a linear trendline, use trendline type as Linear and inject Trendlines module using Chart.Inject(Trendlines).

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'Linear' }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Exponential

An exponential trendline is a curved line that is most useful when data values rise or fall at increasingly higher rates. You cannot create an exponential trendline, if your data contains zero or negative values.

To render a exponential trendline, use trendline type as Exponential and inject Trendlines module using Chart.Inject(Trendlines).

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}

var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        type: 'Scatter',
        trendlines: [
            { type: 'Exponential',enableTooltip:true,marker:{visible:true} }
            ]
            }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Logarithmic

A logarithmic trendline is a best-fit curved line that is most useful when the rate of change in the data increases or decreases quickly and then levels out. A logarithmic trendline can use negative and/or positive values.

To render a logarithmic trendline, use trendline type as Logarithmic and inject Trendlines module using Chart.Inject(Trendlines).

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'Logarithmic' }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Polynomial

A polynomial trendline is a curved line that is used when data fluctuates.

To render a polynomial trendline, use trendline type as Polynomial and inject Trendlines module using Chart.Inject(Trendlines).

polynomialOrder used to define the polynomial value.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'Polynomial' }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Power

A power trendline is a curved line that is best used with data sets that compare measurements that increase at a specific rate.

To render a power trendline, use trendline type as Power and inject Trendlines module using Chart.Inject(Trendlines).

index.js
index.html
var powerData= [
    { x: 1, y: 10 }, { x: 2, y: 50 },{ x: 3, y: 80 }, { x: 4, y: 110 },
    { x: 5, y: 180 }, { x: 6, y: 220 }, { x: 7, y: 300 }, { x: 8, y: 370 }, { x: 9, y: 490 }, { x: 10, y: 500 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 50
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: powerData,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'Power' }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Moving Average

A moving average trendline smoothen out fluctuations in data to show a pattern or trend more clearly.

To render a moving average trendline, use trendline type as MovingAverage and inject Trendlines module using Chart.Inject(Trendlines).

period property defines the period to find the moving average.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'MovingAverage' }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Customization of Trendline

The fill and width properties are used to customize the appearance of the trendline.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ type: 'MovingAverage', fill: 'red', width:2 }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Forecasting

Trendline forecasting is the prediction of future/past situations.

Forward Forecasting and Backward Forecasting are the two types of forecasting.

Forward Forecasting

The value set for forwardForecast is used to determine the distance moving towards the future trend.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',
        trendlines: [{
            type: 'Linear',
            //forward forecast value
            forwardForecast:5
            }]
        }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Backward Forecasting

The value set for the backwardForecast is used to determine the past trends.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',
        trendlines: [{
                type: 'Linear',
                //backward forecast value
                backwardForecast: 5
                }]
        }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Show or hide a trendline

You can show or hide the trendline by setting trendline visible property.

index.js
index.html
var data = [];
var yValue = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
    41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
var point;
var i; var j = 0;
for (i = 1973; i <= 2013; i++) {
    point = { x: i, y: yValue[j] };
    data.push(point);
    j++;
}
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Months',
    },
    primaryYAxis: {
        title: 'Rupees against Dollars',
        interval: 5
    },
    tooltip:{enable:true},
    chartArea: { border: { width: 0 } },
    series: [{
        dataSource: data,
        xName: 'x', yName: 'y',
        name: 'Apple Inc',
        fill: '#0066FF',
        //Series type as scatter
        type: 'Scatter',

        trendlines: [{ visible: false }]
    }],

    title: 'Historical Indian Rupee Rate (INR USD)'
}, '#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="index.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>