First of all we need to create a controller class in a salesforce org. For this tutorial, I am going to name the controller as PieChartController. In this class we are going to fetch the data of Orders and store it in other wrapper class. This wrapper class will be a part of our controller class.

The Wrapper class will look something like this:

public class PieData {

public String name { get; set; }
public Decimal data { get; set; }

public PieData(String namevalue, Decimal datavalue) {
name = namevalue;
data = datavalue;
}
}

Note that in this wrapper class there are two variable one which will hold the name, or we can say label of the pie slice, and the other, i.e. data, will tell the quantity which will be represented in the same chart.

Now that we have completed writing the wrapper class, lets move on to fetching the data and storing it in a wrapper class list variable.

Write a function named getOrderData, with the return type same as the wrapper class name, i.e. PieData. The result will look something like this:

public List getOrderData() {
List data = new List();

decimal draft=0,activated=0;
draft = [select count() from order where status = 'Draft'];
activated = [select count() from order where status = 'Activated'];
data.add(new PieData('Activated ',activated));
data.add(new PieData('Draft ',draft));
return data;
}

In this class we have fetched the count of draft and activated orders, and then added that count to the wrapper class object data, with the corresponding label passed as hard-coded strings.
You can also keep the query in a try-catch block to ensure that the exception no object returned is handled, if there is no order for status either draft, or activated, however it is not required here as count will simply return 0 for such a case.

This completes our Controller class, yet a Visualforce page to display this data still needs to be written. So let’s go on to writing the code for the Visualforce page.

Create a Visualforce page with page controller set as the PieChartController. Then add the following code to the VF page:

<apex:chart data="{!OrderData}" height="400" width="400">
<apex:pieSeries dataField="data"></apex:pieSeries>
</apex:chart>

All the attributes used in this code are required, and the page will not be saved without adding these attributes.

Once you have written the code save and preview it to see the newly created vf page with a pie chart. The output will look something like this:

More Pie Wedges can be added by adding data to the list of the wrapper class variable.

Click here to see a live demo of the output page.

That’s all for how to create Pie Chart in Visualforce, for any further queries feel free to contact us at:

https://wedgecommerce.com/contact-us/

Or let us know your views on how to make this code better, in comments section below.