Thread: In Java Script how to Check Null Value?

I want to check null value. But I don't know anything about it can anyone help me to solve this.

Following code used for checking entry in the field. Rather than telling you logic I had given code. Here either field will return zero length string, or null value if field is kept empty. Check code given below :

Code:

function IsEmpty(aTextField) {
   if ((aTextField.value.length==0) ||
   (aTextField.value==null)) {
      return true;	
   }
   else { return false; }
}