jQuery.when – Callback for when ALL Deferreds are no longer ‘unresolved’ (either resolved or rejected)?

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I think the easiest way to do this is to keep a secondary Deferred object around for each AJAX request, and ensure that that one is always resolved:

var d1 = $.Deferred();
var d2 = $.Deferred();

var j1 = $.getJSON(...).complete(d1.resolve);
var j2 = $.getJSON(...).complete(d2.resolve);

$.when(j1, j2).done(function() {
     // only fires if j1 AND j2 are resolved
});

$.when(d1, d2).done(function() {
     // will fire when j1 AND j2 are both resolved OR rejected
     // check j1.isResolved() and j2.isResolved() to find which failed
});

This is making use of the additional AJAX .complete() method which jQuery adds to its promises for AJAX methods, which is called for both resolved and rejected promises.

NB: d1.resolve works as a callback in its own right, it doesn’t need to be wrapped in a function() { ... } block.

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