Monday, January 9th, 2006
Using the error codes from XHR calls
Category: Ajax, Editorial
, Examples
The main point of the article is the discussion of trapping various status codes, and doing smart things with them.
For example, a smart authentication handler could look something like:
switch (req.status) {
case 200:
// login ok, moving on...
break;
case 201:
// was a registration.. will show a welcome message.
showWelcomeMessage(req.reponseText);
break;
case 403:
// authentication problem. The error message is in responseText
showErrorMessage(req.responseText);
break;
default:
// unknown error
alert('There was a problem..');
}
Of course, there are browser quirks with status codes too, which is why you will see the following in the Prototype code:
responseIsSuccess: function() {
return this.transport.status == undefined
|| this.transport.status == 0
|| (this.transport.status >= 200 && this.transport.status < 300);
}
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