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    <p>nnnnnn's right, you have to use Deferreds/promises to ensure that <code>route_data</code> is populated before sending it to the console.</p> <p>It's not immediately obvious how to do this, with particular regard to the fact that <code>$.when()</code> accepts a series of discrete arguments, not an array.</p> <p>Another issue is that any individual ajax failure should not scupper the whole enterprise. It is maybe less than obvious how to overcome this.</p> <p>I'm not 100% certain but something along the following lines should work :</p> <pre><code>$.getJSON('http://example-app/api/routes/?callback=?', function(data) { var route_promises = []; var route_data = []; function getRouteData(route) { var dfrd = $.Deferred(); $.ajax({ url: 'http://example-app/api/routes/'+route+'?callback=?', dataType: 'json' }).done(function(data) { //console.log(data); // this shows me the 13 objects route_data.push(data); }).fail(function() { route_data.push("ajax error"); }).then(function() { dfrd.resolve(); }); return dfrd.promise();//By returning a promise derived from a Deferred that is fully under our control (as opposed to the $.ajax method's jqXHR object), we can guarantee resolution even if the ajax fails. Thus any number of ajax failures will not cause the whole route_promises collection to fail. } $(data).each(function(i, route) { route_promises.push( getRouteData(route) ); }); //$.when doesn't accept an array, but we should be able to use $.when.apply($, ...), where the first parameter, `$`, is arbitrary. $.when.apply($, route_promises).done(function() { console.log(route_data); }); }); </code></pre> <p><em>untested</em></p> <p>See comments in code.</p>
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