Trendlines in ASP.NET WebForms Chart

9 Mar 20239 minutes to read

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.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Enable Trendline to chart series--%>
               <ej:Trendlines Visibility="visible" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

Click here to view the Trendlines online demo sample.

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.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Customize the Trendline styles--%>
               <ej:Trendlines Fill="#99CCFF" Width="3" Opacity="1" DashArray="2,3" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

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.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="Linear" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

Exponential

Exponential Trendline can be rendered by setting the Type as Exponential.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="Exponential" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

Logarithmic

Logarithmic Trendline can be rendered by setting the Type as Logarithmic.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="Logarithmic" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

Power

Power Trendline can be rendered by setting the Type of the trendline as Power.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="Power" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

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.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="Polynomial"  PolynomialOrder="2"/>
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

MovingAverage

MovingAverage Trendline can be rendered by setting the Type of the trendline as MovingAverage.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Change Trendline type--%>
               <ej:Trendlines Type="MovingAverage"  Period="3"/>
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

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.

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Set forward forecasting value--%>
               <ej:Trendlines ForwardForecast="5" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

Backward Forecasting

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

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Set backward forecasting value--%>
               <ej:Trendlines BackwardForecast="5" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>

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).

HTML

<ej:Chart ID="Chart1" runat="server"> 
    <Series>
       <ej:Series>
           <Trendlines>
               <%--Set Trendline name to display in the legend--%>
               <ej:Trendlines Name="Linear" />
           </Trendlines>
       </ej:Series>
    </Series>
</ej:Chart>