1. <html>
  2. 	<head>		
  3. 		<script type="text/javascript" src="prototype.js"></script>
  4. 		<script>
  5.  
  6. 			function sendRequest() {
  7. 				   new Ajax.Request("test.php",
  8.  
  9.                                         {
  10.  
  11.                                         method: 'post',
  12.  
  13.                                         parameters: {
  14.  
  15.                                                 id:$F('id'),
  16.  
  17.                                                 name:$F('name')
  18.  
  19.                                         },
  20.  
  21.                                         onComplete: showResponse
  22.  
  23.                                         });
  24.  
  25.                                 }
  26.  
  27. 			function showResponse(req){
  28. 				$('show').innerHTML= req.responseText;
  29. 			}
  30. 		</script>
  31. 	</head>
  32.  
  33. 	<body>
  34. 		<form id="test" onsubmit="return false;">
  35. 			<input type="text" name="name" id="name" >
  36. 			<input type="id"   name="id"   id="id"   >
  37. 			<input type="submit" value="submit" onClick="sendRequest()">
  38. 		</form>
  39.  
  40. 		<div id="show"></div>
  41. 	</body>
  42.  
  43. </html>
  44.  
  45.  
  46.  
  47. <?php
  48. $name=$_GET["name"];
  49.  
  50. if($_GET["name"] == "")
  51. 	echo "name is empty";
  52. else
  53. 	echo "you typed".$name;
  54. ?>
  55.  
  56.  
  57.  
  58. Notice: Undefined index: name in C:\wamp\www\Project\test.php on line 2
  59.  
  60. Notice: Undefined index: name in C:\wamp\www\Project\test.php on line 4
  61. name is empty