Update Rollup Field at onload Event in Dynamics 365 using JavaScript

I have created a dynamic function for the ease of use. You just have to pass the function parameters.

Let me explain it with an example

We have a field “pin_numberofproducts” in “opportunities” entity which is rollup field and we want to update its value on load of form.

I have divided function in two separate functions for better understanding.

function onLoadEvent (executionContext)
{ 
    var entityName = 'opportunities'; // Name of Entity 
    var rollup_fieldName = 'pin_numberofproducts'; // Rollup Field
    var entityId = formContext.data.entity.getId().replace('{',   '').replace('}', ''); // GUID of current record
    refreshRoleupField(executionContext,entityName  , entityId, rollup_fieldName ); // Function Call to update value
   
}

All the changes will be done in this onLoadEvent function.

Next function will remain same

Note: I am using 9.1 API if you are using different please change accordingly

function refreshRoleupField  (executionContext, entityName, entityId, rollup_fieldName)
{
 var formContext = executionContext.getFormContext();           
 var clientUrl = formContext.context.getClientUrl();
// Method Calling and defining parameter
 var rollupAPIMethod = "/api/data/v9.1/CalculateRollupField(Target=@tid,FieldName=@fn)";
// Passing Parameter Values
 rollupAPIMethod += "?@@odata.id">tid={'@odata.id':'" + entityName + "(" + entityId + ")'}&@fn='" +   rollup_fieldName + "'";
var req = new XMLHttpRequest();
 req.open("GET", clientUrl + rollupAPIMethod, false);
 req.onreadystatechange = function ()
 {
    if (this.readyState === 4) 
    {
        req.onreadystatechange = null;
        if (this.status === 200) 
        {
          console.log("Field Recalculated successfully");                       
        }
    }
 };
req.send();           
 formContext.data.entity.save();
}

At the end call the onLoadEvent() function on the onload event.

Thank you…. Like and follow ;)