JavaScripts in CRM 2011

// Get the label of the control
Xrm.Page.ui.controls.get('wwb2c_approved').getLabel()
// Get record id
crmForm.ObjectId --> Xrm.Page.data.entity.getId()

// set field as required based value of a check box field.

function OnChangeBoolField()
{
var varBool = Xrm.Page.data.entity.attributes.get("boolFieldName").getValue();
if(varBool == false)
{
 Xrm.Page.getAttribute("new_startdate").setRequiredLevel("required");
 Xrm.Page.getAttribute("new_dueby").setRequiredLevel("required");
}
else
{
 Xrm.Page.getAttribute("new_startdate").setRequiredLevel("none");
 Xrm.Page.getAttribute("new_dueby").setRequiredLevel("none");
}
}
 // Compare Dates
function ValidateDates()
{

 var startdate = Xrm.Page.getAttribute('new_startdate').getValue();
 var dueby = Xrm.Page.getAttribute('new_dueby').getValue(); 

 if(startdate != null && dueby != null)
 {
 if(dueby.setHours(0,0,0,0) < startdate.setHours(0,0,0,0))
 {
 alert('Due By must be greater than or equal to Start Date');
 event.returnValue = false;
 return false;
 }
 }
}

// few more JavaScript code

// function to check for Status Code for Medical pre clearance 
function OnSave()
{
	if(Xrm.Page.data.entity.getIsDirty())
	{
     // get the value of Status Code option set
	 var statusCodeOptionSet = Xrm.Page.getAttribute("statuscode").getSelectedOption().value;
	 // if selected status code is Medically Pre Cleared i.e. 100000006
	 if(statusCodeOptionSet == 100000006)
	 {	
	 // ask for confirmation before saving the record
	 var response = confirm("sample"+"\n"+"text");
		if(!response)
		{
			event.returnValue = false;
			return false;		
		}	 
	 } 
   }	 
}