Hey Below is the Code To Set a Attribute / field on form Read only (Lock) using JavaScript in MS CRM .
// Get Control of entity
Xrm.Page.ui.controls.get(“new_companyreference”);
// Now set the property to lock the field
ToBeReadOnlyControl.setDisabled(true);
Note : Xrm.Page.ui.controls.get(“new_companyreference”); by this we get full UI controls of the attribute / field by which we can set or get any ui property of that field .
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