How to update the field of a Parent enity (field is not visibe on the Form) from a Child Entity in MSCRM 2013

Question

Hi All,
          I m new to CRM customization. I have requirement like this..
I have 3 entities.. Entity1 , Entity 2 and Entity3.
Entity1 is the parent of Entity2 and Entity3. Entity2 is the parent of Entity3 and child of Entity1 ..
In Entity1 I have a field eg:product1 which acts as lookup for Entity2 field availableproducts.  Now in Entity2 I have a field the quantity of products which acts as lookup for Entity3 as given below.
In Entity3: fields:;; products==Lookup of Products(Entity1)
                              quantity == Lookup of Quantity (Entity2)
Now from Entity3 I need to update the fields of Entity1 like I have field named Price which is not visible on the Entity3 Form  but when I access this field from javascript I m getting null exceptions since the field is not in the context of the Entity
on which it is defined. How can I update the fields of the Parent Entity1 from child Entity3  and also update the quantity field on Entity2 which are not avialable on the Entity3 Form.
Any help is appreciated
Waiting for the reply..
FayazSyed

Answer 1

Hi,
To do it in JS you need to use oData, as wrote above:
to make this requests easer, i use a XrmSvcToolkit library (https://xrmsvctoolkit.codeplex.com/)
Your code will be about this:
/// <reference path="rtb_XrmSvcToolkit.js" />
XrmSvcToolkit.retrieve({
entityName: "Entity1",
id: Xrm.Page.getAttribute("quantity").getValue()[0].id,
select: ["my_FieldNeedToUpdate"], //Here are the name of your fields, which you want to select.
expand: [""],
async: false,
successCallback: function (result) {
FieldNeedToUpdate= result.my_FieldNeedToUpdate;
errorCallback: function (error) {
Error = error;
FieldNeedToUpdate = FieldNeedToUpdate + 1; //Doing some work here
var InputEntity =
my_FieldNeedToUpdate: FieldNeedToUpdate //here are fields, witch you want to update
XrmSvcToolkit.updateRecord({
entityName: "Entity1",
id: Xrm.Page.getAttribute("quantity").getValue()[0].id,
entity: InputEntity ,
async: false
Here are more samples:
https://xrmsvctoolkit.codeplex.com/SourceControl/latest#Samples/XrvSvcToolkit.Samples.updateRecord.js