Dojo require, connect to error when module failed loading

Question

When I try to load nonexistent module, it fail with 404 error (of course). I want to handle this error but don't know how to connect to "error" event.

According to Dojo doc, I should be able to do that using its micro event api.

This code does not work.

var handle = require.on('error', function( error )
                 {
                     alert('Finally error')
                 });

require(['nonexistent/module'], function ( m )
{
     alert('Module was loaded correctly')           
});

Dojo version is 1.7.1, browser latest Chrome.

Answer 1

The documentation on this one is a bit curious. I can get the 'error' event to fire after a short timeout (dojoConfig.waitSeconds) after a failed xhr require, but only in async mode, and only with a dev build of Dojo.

Why? Well, only async mode raises the event, and it looks like the CDN build was built with dojo-timeout-api == 0.

Can you use your own custom (SDK) version of Dojo?

@mschr - your jsfiddle sample works if you use Dojo (nightly) instead of Dojo 1.7.2 - same reason as above.

Answer 2

try it with debugging set

<script src="{{baseUrl}}/dojo/dojo.js" data-dojo-config="async:true, debug: true, debugAtAllCost:true"></script>

Edit; no such luck - it seems that docs are ahead of implementation here..

created a fiddle for the purpose of maybe finding a solution, concept is nice, would enjoy to use this myself

http://jsfiddle.net/seeds/h6bXQ/