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Chapter 5. Communicating with the Server > Recipe: Handling Server Errors
Recipe: Handling Server Errors
To test the fail() handler, the test server from the first recipe provides a fail-on-purpose URL. Listing 5.5 calls this URL to see what happens.
Listing 5.5. Catching Server Errors by Using fail()
00 <!DOCTYPE html>
01
02 <html lang="en">
03 <head>
04 <title>Test case: failure</title>
05 </head>
06 <body>
07
08 <h2>Press the button to perform the request.</h2>
09
10 <button id="trigger">GET</button>
11 <br>
12 <div id="target">
13
14
15 <script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
16
17 <script>
18 // please externalize this code to an external .js file
19 $(document).ready(function() {
20
21 $('#trigger').click(function() {
22
23 $.ajax('fail-on-purpose')
24 .done(function(data, xhr) {
25 $('#target').append('Unexpected success. . . ' +
26 '(actually not a good thing)');
27 })
28 .fail(function(xhr, text, error) {
29 $('#target').append('Failed as expected (good!). Code ' +
30 xhr.status + ' and text ' + error);
31 });
32
33 });
34
35 });
36 </script>
37 </body>
38 </html>
As expected, the fail() callback is called. From the parameters passed to this callback handler, you can determine what went wrong and act accordingly.
