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Thread: jsp + ajax

  1. 11-20-2009, 07:59 AM #1
    sysout
    sysout is offline Member
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    Default jsp + ajax

    index.jsp
    Java Code: 
    <html>
	<head>
		<script language="javascript">
		function checkUsername(keyEvent){
			keyEvent = (keyEvent) ? keyEvent : window.event;
			input = (keyEvent.target) ? keyEvent.target : keyEvent.srcElement;
			
			if(keyEvent.type == "keyup"){
				var targetDiv = document.getElementById("targetDiv");
				if(input.value){
					getData("login.jsp?qu="+input.value);
				}
			}			
		}		
		
		function getData(dataSource){
			if(XMLHttpRequestObject){
				XMLHttpObject.open("GET", dataSource);
				XMLHttpRequestObject.onreadystatechange == function(){
					if(XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200){
						if(XMLHttpRequestObject.responseText == "taken"){
							var targetDiv = document.getElementById("targetDiv");
							targetDiv.innerHTML = '<div>That Username Is Taken/div>';
						}
					}
				}
				XMLHttpRequestObject.send(null);
			}
		}
		</script>
	</head>
	<body>
	<form id="form1" name="form1" method="POST">
	  <p>username : 
		<input name="username" type="text" id="username" onkeyup="checkUsername(event)" /><div id="targetDiv"><div></div></div>
	  </p>
	  <p>password : 
		<input name="password" type="text" id="password" />
	  </p>
	</form>
	</body>
</html>
    login.jsp
    Java Code: 
    <%
  String username = request.getParameter("qu");
  if(username.equals("steve")){
  	out.print("taken");
  }
  else{
    out.print("ok");
  }
%>
    does ajax doesn't return error? (javascript I mean)
    this doesn't work for me
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  2. 07-19-2010, 11:53 AM #2
    arun9683
    arun9683 is offline Member
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    Default

    Ajax is asynchronous it will not work synchronusly..
    Arun K R,Bangalore,India
    :)
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