CRM 2011 Retrieving lookup - dynamics-crm-2011

Question

I'm new in CRM development. I know a basic thing like "best practice for crm 2011"
I wanna understand now how to work with lookup fields. And I think I chose the easiest way for my self.
I have an costum entity "contract" it has 5 more field, 2 of these are lookups.
First lookup (agl_contractId) - it is a link by it self
Second lookup (agl_ClientId) - link to Client.
What do I need?
When I choose fill First lookup (agl_contractId), script should find in this contract a Client and copy-past it to current form.
I've done script but it isn't work... (((
function GetAccountFromContract()
{
XrmServiceToolkit.Rest.Retrieve(Xrm.Page.getAttribute("agl_osnovnoy_dogovorid").getValue(),
'agl_osnovnoy_dogovoridSet',
null,null,
function (result) {
var Id = Xrm.Page.getAttribute("agl_osnovnoy_dogovorid").getValue();
if (result.Id != null) {
var LookupData = new Array();
var LookupItem = new Object();
var lookuptextvalue = lookupvalue[0].name;
var lookupid = lookupvalue[0].id;
var lokupType = lookupvalue[0].entityType;
alert(lookupvalue);
alert(lookupData);
Xrm.Page.getAttribute("agl_accountid").setValue(lookupData);
}
},
function (error) {
equal(true, false, error.message);
},
false
);
}

Answer 1

If I understand you well: When you select Contract in agl_osnovnoy_dogovorid field, you want to pull Client property from that Contract and put it in agl_accountid field?
If that is right:
First, get Id of selected Contract (from agl_osnovnoy_dogovorid field)
var selectedContract = new Array();
selectedContract = Xrm.Page.getAttribute("agl_osnovnoy_dogovorid").getValue();
{
var guidSelectedContract = selectedContract[0].id;
//var name = selectedContract[0].name;
//var entType = selectedContract[0].entityType;
}
Second, retrieve Client from agl_osnovnoy_dogovorid. Your oData query will be like:
http://crmserver/org/XRMServices/2011/OrganizationData.svc/ContractSet(guid'" + guidSelectedContract + "')/CustomerId
(In example I'm using CustomerId field. For your case enter Schema Name of Client field).
Now, execute query and put result into agl_accountid field:
$.getJSON(
Xrm.Page.context.getServerUrl() + "/XRMServices/2011/OrganizationData.svc/ContractSet(guid'" + guidSelectedContract + "')/CustomerId",
function(data){
if(data.d.CustomerId != null && data.d.CustomerId.Id != null && data.d.CustomerId.Id != "undefined")
{
//set agl_accountid field
Xrm.Page.getAttribute("agl_accountid").setValue([{id:data.d.CustomerId.Id, name:data.d.CustomerId.Name, typename:data.d.CustomerId.LogicalName}]);
}
});

Answer 2

Your using REST to retrieve data but also using FetchXml example to setup the agl_accoutid lookup.
Also some of the conditions are not clear … anyway … I’ve incorporated the change to your original post.
function GetAccountFromContract()
{
var aodLookupValue = Xrm.Page.getAttribute("agl_osnovnoy_dogovorid").getValue();
if (!aodLookupValue) return;
XrmServiceToolkit.Rest.Retrieve( aodLookupValue[0].id ,
'agl_osnovnoy_dogovoridSet', null,null,
function (result) {
var customer = result.d["your attribute name"];
if (customer) {
var LookupData = new Array();
var LookupItem = new Object();
var lookuptextvalue = customer.Name;
var lookupid = customer.Id;
var lokupType = customer.LogicalName;
alert(lookupvalue);
alert(lookupData);
Xrm.Page.getAttribute("agl_accountid").setValue(lookupData);
}
},
function (error) {
equal(true, false, error.message);
}, false );
}