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function yourfunctionname(){  //this is your function name - call it what you want
	document.getElementById("elementid").addEventListener("blur",nextfunction, true); //elementid is the id of the field you watching, when it blurs then it runs the next function. This is actually watching a div element - found this easiest to do what I want
	
	function nextfunction(){ // this is called by the bluring of the above div element - means user left field
		if($j('#fieldid').val() == (17)){ //this value is the value of what is entered in the field referenced - as I only had one value to trap for I put it in. But you could have a call which gets the id and compares it to an array or whatever
			
		$j('#fieldtohide').hide(); //this tells it to hide this field if the value == 17
		} else {
			$j('#fieldtohide').show(); //otherwise it tells it to show it
		
	
	}
	}
		
}  //the code below here is for firefox browsers. They do not like blur and this resolves it with the focusout routine
$j(document).ready(function(){ 
	$j('#fieldtohide').hide(); // I hid the field when the document was ready.
	setTimeout(function() { $j('#divname').focusout(); }, 100);
	});

Code: Select all

function yourfunctionname(){  //this is your function name - call it what you want
   document.getElementById("elementid").addEventListener("blur",nextfunction, true); //elementid is the id of the field you watching, when it blurs then it runs the next function. This is actually watching a div element - found this easiest to do what I want
   
   function nextfunction(){ // this is called by the bluring of the above div element - means user left field
      if($j('#fieldid').val() == (17)){ //this value is the value of what is entered in the field referenced - as I only had one value to trap for I put it in. But you could have a call which gets the id and compares it to an array or whatever
         
      $j('#fieldtohide').hide(); //this tells it to hide this field if the value == 17
      } else {
         $j('#fieldtohide').show(); //otherwise it tells it to show it
      
   
   }
   }
   }  //the code below here is for firefox browsers. They do not like blur and this resolves it with the focusout routine
$j(document).ready(function(){ 
   $j('#fieldtohide').show(); // I make sure the field shows when the document was ready.
   setTimeout(function() { $j('#divname').focusout(); }, 100);  //I found the value of 100 seemed to work everytime in firefox
   });