JScript to automatcally set Regarding on an appointment, possible?

Question

Hello,
I have been trying to figure out how to accomplish this:
I would like to on an appointment set the Regarding(regardingobjectid) field with the parent account of the contact (or account) selected to the Required (requiredattendees). The script would run on the OnChange-event of the required field.
I am able to get the fields to polpulate with data that lies inside the current record but cannot quite figure out how to manage to get the data from the related record of the Required-field. Is it possible, surely it has to be?
I have been looking into web pages on REST, I suppose that is the way to go, but as I said, I haven't managed to figure it out quite yet.
Does anyone have links or tips that would help to figure this out?
Br,
Janne

Answer 1

Dear Janne,
Try below code :
function SetRegardingObjectId () {
var requiredattendees = Xrm.Page.getAttribute("requiredattendees");
if(requiredattendees.getValue() !=null)
var RequireAttendessType = Xrm.Page.getAttribute("requiredattendees").getValue()[0].entityType;
if(RequireAttendessType =="contact")
var serverUrl ;
if(Xrm.Page.context.getClientUrl)//Post UR 12
serverUrl = Xrm.Page.context.getClientUrl();
else//Pre UR 12
serverUrl = Xrm.Page.context.getServerUrl();
var requiredAttendeesId = requiredattendees.getValue()[0].id;
var ODataPath = serverUrl + "/XRMServices/2011/OrganizationData.svc";
var oDataFilter ="/ContactSet?$select=ParentCustomerId&$filter=ContactId eq guid'" + requiredAttendeesId + "'";
var userRequest = new XMLHttpRequest();
userRequest.open("GET", ODataPath + oDataFilter , true);
userRequest.setRequestHeader("Accept", "application/json");
userRequest.setRequestHeader("Content-Type", "application/json; charset=utf-8");
userRequest.onreadystatechange = function () {
if (this.readyState == 4) {
if (this.status == 200) {
var retrievedRecords = JSON.parse(userRequest.responseText).d;
if(retrievedRecords.results.length > 0)
var parentaccount = retrievedRecords.results[0];
var lookup = new Array();
lookup[0] = new Object();
lookup[0].id = parentaccount.ParentCustomerId.Id;
lookup[0].name = parentaccount.ParentCustomerId.Name;
lookup[0].entityType = parentaccount.ParentCustomerId.LogicalName;
Xrm.Page.getAttribute("regardingobjectid").setValue(lookup);
userRequest.send();
else
var lookup = new Array();
lookup[0] = new Object();
lookup[0].id = requiredattendees.getValue()[0].id;
lookup[0].name = requiredattendees.getValue()[0].name;
lookup[0].entityType = requiredattendees.getValue()[0].entityType;
Xrm.Page.getAttribute("regardingobjectid").setValue(lookup);