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http://stackoverflow.com/questions/14042193/how-to-trigger-an-event-in-input-text-after-i-stop-typing-writing

<input type="text" id="shipfrom_zip" required="true">
<input type="text" id="shipto_zip" required="true">
<input type="text" id="pallets" required="true">
<input type="text" id="shipdate" required="true">



<script>
$( document ).ready(function() {  
	// set time in seconds
	var delay = (function(){
	  var timer = 0;
	  return function(callback, ms){
	  clearTimeout (timer);
	  timer = setTimeout(callback, ms);
	 };
	})();
	
	/*
	- run initialize if all 3 input fields are not empty
	- delay this for 3 seconds
	*/
	$("#shipfrom_zip, #shipto_zip, #pallets").keyup(function () {
	    if ($('#shipfrom_zip').val() != 0 && $('#shipto_zip').val() != 0 && $('#pallets').val() != 0  ) {
		    
		  // Delay keyup for 3 seconds
		     delay(function(){
		       initialize() ;
		     }, 3000 );		    
	       console.log("initialize() ") ;
	    }
	});  
	
});   
  
</script>