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I currently ran into a problem where a lazy loaded javascript would execute twice using internet explorer - and ONLY internet explorer (currently version 9). Firefox and chrome works. Here is my code: injectExternalJavaScript: function(fileUrl) { return jQuery.Deferred(function(deferred) { var script = document.createElement('script'); script['src'] = fileUrl; script['type'] = 'text/javascript'; var head = document.getElementsByTagName("head")[0]; var done = false; // Attach handlers for all browsers script['onload'] = script['onreadystatechange'] = function() { if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === 'complete')) { done = true; script['onload'] = script['onreadystatechange'] = null; head.removeChild(script); deferred.resolve(); } }; head.appendChild(script); }).promise(); } I already found this posting and changed my code according to it but still ie is executing my script twice. You guys got any ideas? Edit: This is my solution injectExternalJavaScript: function(fileUrl) { return jQuery.Deferred(function(deferred) { var script = document.createElement('script'); script['src'] = fileUrl; script['type'] = 'text/javascript'; var head = document.getElementsByTagName("head")[0]; var done = false; // Attach handlers for all browsers var cb = function() { if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === 'complete')) { done = true; script['onload'] = script['onreadystatechange'] = null; head.removeChild(scr

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