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2012-12-11T10:23:43.977
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2012-12-11T10:23:43.977
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I've found a workaround to get an error callback with an empty response in cross domain requests. In this example I'm using Zepto, a light-weight version of jQuery, but I assume that this works fine in jQuery too. First of all, you must use these parameters to do a cross domain request: <pre><code>$.ajax({ url: url, type: 'GET', dataType: 'jsonp', contentType: 'application/x-javascript', crossDomain: true, success: function (data, status) { /* ... */ } error: function () { /* ... */ } // ... </code></pre> Now, the $.ajax function internally use the $.ajaxJSONP for crossdomain requests. This is the original Zepto $.ajaxJSONP function: <pre><code> $.ajaxJSONP = function(options){ var callbackName = 'jsonp' + (++jsonpID), script = document.createElement('script'), abort = function(){ $(script).remove() if (callbackName in window) window[callbackName] = empty ajaxComplete('abort', xhr, options) }, xhr = { abort: abort }, abortTimeout if (options.error) script.onerror = function() { xhr.abort() options.error() } window[callbackName] = function(data){ clearTimeout(abortTimeout) $(script).remove() delete window[callbackName] ajaxSuccess(data, xhr, options) } serializeData(options) script.src = options.url.replace(/=\?/, '=' + callbackName) $('head').append(script) if (options.timeout > 0) abortTimeout = setTimeout(function(){ xhr.abort() ajaxComplete('timeout', xhr, options) }, options.timeout) return xhr } </code></pre> My workaround is very simple and consists on an interval called few times on the script.onload event handler, in order to verify that the callback function was called. This is my version of the $.ajaxJSONP function: <pre><code>$.ajaxJSONP = function(options){ var called = false, // Flag to check that callback was called callbackName = 'jsonp' + (++jsonpID), script = document.createElement('script'), abort = function(){ $(script).remove() if (callbackName in window) window[callbackName] = empty ajaxComplete('abort', xhr, options) }, xhr = { abort: abort }, abortTimeout if (options.error) { script.onerror = function() { xhr.abort() options.error() }; // IMPORTANT!!! script.onload = function () { var times = 0; var interval = setInterval(function () { // After 5 intervals, if the callback wasn't called, returns an error if (times++ == 5) { clearInterval(interval); if (!called) { options.error(); } } else if (called) { clearInterval(interval); } }, 100); }; } window[callbackName] = function(data){ // Setting the "called" flag to true called = true; clearTimeout(abortTimeout) $(script).remove() delete window[callbackName] ajaxSuccess(data, xhr, options) } serializeData(options) script.src = options.url.replace(/=\?/, '=' + callbackName) $('head').append(script) if (options.timeout > 0) abortTimeout = setTimeout(function(){ xhr.abort() ajaxComplete('timeout', xhr, options) }, options.timeout) return xhr } </code></pre> Note: If you are interested in the server side behavior, please see the beginning of this tutorial: <a href="http://phonegap.com/2011/07/20/making-jsonp-calls-with-zepto-on-android-device/" rel="nofollow">http://phonegap.com/2011/07/20/making-jsonp-calls-with-zepto-on-android-device/</a>
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1. POjQuery get JSON response is empty
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1. USFrancesco Casula
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