I am trying to learn AJAX with JSP and I have written the following code. This does not seem to be working. Kindly help:
This is my configuration_page.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
var config=document.getElementById('configselect').value;
var url="get_configuration.jsp";
if (window.XMLHttpRequest)
{
xmlhttp=new XMLHttpRequest();
}
else
{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
}
</script>
</head>
<body>
<h2 align="center">Saved Configurations</h2>
Choose a configuration to run:
<select name="configselect" width="10">
<option selected value="select">select</option>
<option value="Config1">config1</option>
<option value="Config2">config2</option>
<option value="Config3">config3</option>
</select>
<button type="button" onclick='loadXMLDoc()'> Submit </button>
<div id="myDiv">
<h4>Get data here</h4>
</div>
</body>
</html>
This is my get_configuration.jsp which I am trying to access from the AJAX code above:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h4>Mee..</h4>
</body>
</html>
This question is related to
java
ajax
jsp
asynchronous
You are doing mistake in "configuration_page.jsp" file. here in this file , function loadXMLDoc() 's line number 2 should be like this:
var config=document.getElementsByName('configselect').value;
because you have declared only the name attribute in your <select> tag. So you should get this element by name.
After correcting this, it will run without any JavaScript error
I have used jQuery AJAX to make AJAX requests.
Check the following code:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#call').click(function ()
{
$.ajax({
type: "post",
url: "testme", //this is my servlet
data: "input=" +$('#ip').val()+"&output="+$('#op').val(),
success: function(msg){
$('#output').append(msg);
}
});
});
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
input:<input id="ip" type="text" name="" value="" /><br></br>
output:<input id="op" type="text" name="" value="" /><br></br>
<input type="button" value="Call Servlet" name="Call Servlet" id="call"/>
<div id="output"></div>
</body>
loadXMLDoc JS function should return false, otherwise it will result in postback.
Source: Stackoverflow.com