ajax status = 0
i'm trying to get information from a remote server on my local machine. readyState has no problem, i.e. ==4. however, status is always 0(instead of 200) when I hit the button, it returns nothing.
here is the code,:
<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET",'http://www.spartanbook.com/textbooks_xml.asp?control=campus&campus=45&term=80',true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadXMLDoc()"&g开发者_运维技巧t;Change Content</button>
</body>
</html>
It's basically from w3shcools. simply replaced the url. the url I'm using is working when I paste it into address bar of my browser.
Any idea? Thanks!!
Check that you are not making a cross domain request.
If for example you are not serving this page from http://www.spartanbook.com then the expected result would be access denied, which oddly enough gives a readyState of 4, but a status of 0.
If you need to make a cross domain request, then you need to use a proxy.
This error code indicates that the response was empty. Seems like a firewall issue
Like Gavin says, it seems your problem is that you're making a cross domain request, which is blocked by most browsers due to security reasons: http://en.wikipedia.org/wiki/Same_origin_policy
I suggest you move the code from your local computer to a place which satisfies the "Same Origin Policy", in your case that is somewhere on www.spartanbook.com.
However, there is a workaround for the problem, and that is to use JSONP. That will allow you to fetch JSON data from a program on another domain.
加载中,请稍侯......
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