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Re: [gwt-contrib] Revisiting the script-via-
default linkage</span></a></span> </h1> <p class="darkgray font13"> <span class="sender pipe"><a href="/search?l=google-web-toolkit-contributors@googlegroups.com&q=from:%22Matt+Mastracci%22" rel="nofollow"><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">Matt Mastracci</span></span></a></span> <span class="date"><a href="/search?l=google-web-toolkit-contributors@googlegroups.com&q=date:20091201" rel="nofollow">Tue, 01 Dec 2009 08:05:32 -0800</a></span> </p> </div> <div itemprop="articleBody" class="msgBody"> <!--X-Body-of-Message--> <pre>On 1-Dec-09, at 7:51 AM, Lex Spoon wrote: > On Mon, Nov 30, 2009 at 10:28 PM, Matt Mastracci <matt...@mastracci.com > > wrote: >> 2. onerror works some of the time in some of the browsers. It >> fails on >> various combinations of resolve errors, error status codes and >> other failure >> conditions. For all browsers (except Opera) that don't support it >> directly, >> It can be emulated with onreadystatechange/onload and lack of a JSONP >> callback. > > Can you expand on that? IE has script-tag callbacks that should be > usable to detect download errors. What did you get working on other > browsers? > > If there's a way to detect download failures on Firefox and on > Webkit-based browser, then JSONP downloads are better than I thought.</pre><pre> onerror is reasonably reliable across modern browsers. For IE, you can use onreadystatechange to detect that the script finished loading and then check to see if a JSONP callback wasn't made or a marker global wasn't initialized: Firefox 2/3/3.5: onerror will fire Safari 3/4: onerror will fire Safari 2: no events will fire Chrome: onerror will fire IE6/7/8: onreadystatechange(loaded) will fire, but JS won't be loaded Opera: no events will fire As mentioned before, I couldn't get Opera to tell me when a script failed. Safari 2 also seemed to ignore error conditions, but its overall browser share is negligible. All of the browsers that responded to errors threw the same errors when retrieving a 404 response or an error while resolving a domain. I've seen some notes elsewhere that inferred that some browsers treated some error conditions differently, but I couldn't reproduce that in testing. Note that the events only seem to work consistently across browsers when assigning a function to the onevent properties before the src is assigned. This is basically the code I used for my test: function testLoad() { !!marker ? success() : error(); } var script = document.createElement('script'); script.onreadystatechange = function(e) { if (this.readyState == 'loaded') testLoad(); } script.onload = function(e) { testLoad(); } script.onerror= function(e) { error(e); } script.src = 'notfound.js'; document.body.insertBefore(script, null); Matt. -- <a rel="nofollow" href="http://groups.google.com/group/Google-Web-Toolkit-Contributors">http://groups.google.com/group/Google-Web-Toolkit-Contributors</a> </pre> </div> <div class="msgButtons margintopdouble"> <ul class="overflow"> <li class="msgButtonItems"><a class="button buttonleft " accesskey="p" href="msg10951.html">Previous message</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="c" href="thrd2.html#10954">View by thread</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="i" href="mail2.html#10954">View by date</a></li> <li class="msgButtonItems textalignright"><a class="button buttonright " accesskey="n" href="msg11120.html">Next message</a></li> </ul> </div> <a name="tslice"></a> <div class="tSliceList margintopdouble"> <ul class="icons monospace"> <li class="icons-email"><span class="subject"><a href="msg10826.html">Re: [gwt-contrib] Revisiting the script-via-<iframe> ...</a></span> <span class="sender italic">Ray Cromwell</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg10841.html">Re: [gwt-contrib] Revisiting the script-via-<iframe...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg10928.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email"><span class="subject"><a href="msg10933.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Ray Cromwell</span></li> <li class="icons-email"><span class="subject"><a href="msg10955.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg10956.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email"><span class="subject"><a href="msg10959.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Joel Webber</span></li> <li class="icons-email"><span class="subject"><a href="msg10961.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg10942.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg10951.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email tSliceCur"><span class="subject">Re: [gwt-contrib] Revisiting the script-via-<if...</span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg11120.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg11138.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email"><span class="subject"><a href="msg11139.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> <li class="icons-email"><span class="subject"><a href="msg11253.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email"><span class="subject"><a href="msg11254.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">John Tamplin</span></li> <li class="icons-email"><span class="subject"><a href="msg11255.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Lex Spoon</span></li> <li class="icons-email"><span class="subject"><a href="msg11257.html">Re: [gwt-contrib] Revisiting the script-via-<if...</a></span> <span class="sender italic">Matt Mastracci</span></li> </ul> </ul> </ul> </ul> </ul> </ul> </ul> </ul> </div> <div class="overflow msgActions margintopdouble"> <div class="msgReply" > <h2> Reply via email to </h2> <form method="POST" action="/mailto.php"> <input type="hidden" name="subject" value="Re: [gwt-contrib] Revisiting the script-via-<iframe> default linkage"> <input type="hidden" name="msgid" 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