handle jquery ajax redirect
I'm making a $.get to call a service 'A'. Service 'A' returns plain text which I display on the pa开发者_高级运维ge. But sometimes it redirects to service 'B' which returns plain text. But, I'm unable to handle the response text of service 'B'. How do I do that?
I can not prove, but I hope that this script can guide you to a solution:
you would have to prove your status differences or text on each type of response from "a.php"
$.ajax({
type: "GET",
url: "a.php",
complete: function (XMLHttpRequest, textStatus) {
if (XMLHttpRequest.status!=200) // or responseText
{
var fn = arguments.callee;
var _this = this;
setTimeout(function(){fn.call(_this, XMLHttpRequest, textStatus);}, 200);
}
else
{
//ok
}
}
});
or EDIT:
complete: function xCompleteFunction(XMLHttpRequest, textStatus) {
if (XMLHttpRequest.status!=200) // or responseText
{
var _this = this;
setTimeout(function(){xCompleteFunction.call(_this, XMLHttpRequest, textStatus);}, 200);
}
else
{
//ok
}
}
function call to itself
EDIT II:
redirect.html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<title></title>
<script type="text/javascript">
$(function(){
$("#senddata").click(function(){
$.ajax({
type: "GET",
url: "a.php",
complete: function xCompleteFunction(XMLHttpRequest, textStatus) {
$("#info").append(""+XMLHttpRequest.status+"<br />"+XMLHttpRequest.responseText+"<br>");
if (XMLHttpRequest.status==301) // or responseText
{
var _this = this;
setTimeout(function(){xCompleteFunction.call(_this, XMLHttpRequest, textStatus);}, 200);
$("#info").append("waiting redirect<br>");
}
else
{
$("#info").append("redirect ok<br>");
}
}
});
});
});
</script>
</head>
<body>
<button id="senddata">send ajax request</button>
<pre id="info"></pre>
</body>
</html>
a.php:
<?php
for($a=0;$a<1000000;$a++)
{
//wait
}
header('Location: b.php');
b.php:
<?php
print "hola mundo";
Important: Status Code Definitions
You cannot do this in javascript. You can change your server-side behaviour.
The silent (transparent) redirection is the part of XMLHttpRequest specification (see here especially the words "... transparently follow the redirect ..."). The standard mention only that the user agent (the web browser) can prevent or notify of certain kinds of automatic redirections, but it's not a part of XMLHttpRequest. It's the part of HTTP client configuration (OS configuration) or the web browser configuration
If service B is listening at different domain, then such cross-domain AJAX calls are forbidden, unless there is crossdomain.xml file allowing it.
What is the nature of Service 'A' and 'B'? A neater solution would be to handle the discrepancy server-side. For example, if Service A is a PHP script...
<?php
if(prerequisite for display service A plain text){
echo "service a plain text";
}else{
echo "service b plaint text";
}
?>
Alternatively, if these services are text files, you could have a third file that makes the decision, and includes Service A or B depending. For example, this could be ajax.php, and you would call ajax.php in all cases:
<?php
if(prerequisite for displaying service A plain text){
echo file_get_contents("a.txt");
}else{
echo file_get_contents("b.txt");
}
?>
From what it sounds like, your conditional will be file_exists("a.txt"), but that's just a guess on my part.
Good luck, and comment if you've any questions!
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