Trendlines

EjChart can generate Trendlines for Cartesian type series (Line, Column, Scatter, Area, Candle, HiLo etc.) except bar type series. You can add more than one trendline object to the trendlines option.

  • javascript
  • /// <reference path="tsfiles/jquery.d.ts" />
    /// <reference path="tsfiles/ej.web.all.d.ts" />
    
    module ChartComponent {
        $(function () {
            var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Enable Trendline to chart series
                           visibility: "visible", type: "linear"
                         }],
                    //...
                  }]          
                 //...  
            });
        });
    }

    Customize the trendline styles

    A trendline can be customized by using the properties such as fill, width, dashArray and opacity. The default type of trendline is “linear”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                             //...
                             //Customize the Trendline styles
                             fill: '#99CCFF', width: 3, opacity: 1, dashArray: '2,3'
                         }],
                    //...
                  }]          
                 //...  
            });

    Types of Trendline

    EjChart supports the following type of Trendlines.

    • Linear
    • Exponential
    • Logarithmic
    • Power
    • Polynomial
    • MovingAverage

    Linear

    To render Linear Trendline, you have to set the type as “linear”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type
                           type: "linear"
                         }],
                    //...
                  }]          
                 //...  
            });

    Exponential

    Exponential Trendline can be rendered by setting the type as “exponential”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type
                           type: "exponential"
                         }],
                    //...
                  }]          
                 //...  
            });

    Logarithmic

    Logarithmic Trendline can be rendered by setting the type as “Logarithmic”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type
                           type: "logarithmic"
                         }],
                    //...
                  }]          
                 //...  
            });

    Power

    Power Trendline can be rendered by setting the type of the trendline as “power”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type
                           type: "power"
                         }],
                    //...
                  }]          
                 //...  
            });

    Polynomial

    Polynomial Trendline can be rendered by setting the trendline type as “polynomial”. You can change the polynomial order by using the polynomialOrder of the trendlines. It ranges from 2 to 6.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type
                           type: "polynomial"
                         }],
                    //...
                  }]          
                 //...  
            });

    MovingAverage

    MovingAverage Trendline can be rendered by setting the type of the trendline as “movingAverage”.

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //Change Trendline type and set [`period`](../api/ejchart#members:series-trendlines-period) for moving average
                           type: "movingAverage", period: 3
                         }],
                    //...
                  }]          
                 //...  
            });

    Forecasting

    Trendline forecasting is the prediction of future/past situations. Forecasting can be classified into two types as follows.

    • Forward Forecasting
    • Backward Forecasting

    Forward Forecasting

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

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //...
                           //Set forward forecasting value
                           forwardForecast: 5
                         }],
                    //...
                  }]          
                 //...  
            });

    Backward Forecasting

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

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //...
                           //Set forward forecasting value
                           backwardForecast: 5
                         }],
                    //...
                  }]          
                 //...  
            });

    Trendlines Legend

    To display the legend item for trendline, use the name property. You can interact with the trendline legends similar to the series legends (show/hide trendlines on legend click).

  • javascript
  • var chartsample = new ej.datavisualization.Chart($("#chartcontainer"), {
                series:[{
                      trendlines: [{
                           //...
                           //Set Trendline name to display in the legend
                           name: 'Linear'
                         }],
                    //...
                  }]          
                 //...  
            });