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Re: Locks on firefox
by Arnaud Andrillon
::
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I opened a bug entry in Dojo bug tracker : #1640
Fredrik Johansson a écrit :
> Thank you Arnaud !
>
> Very descriptive, I did'nt know that.
>
> / Fredrik
>
> torsdag 12 oktober 2006 08:25 skrev Arnaud Andrillon:
>
>> I think I have same problem :
>>
>> Browser : Firefox 1.5 (config : default [keep-alive activated,
>> network.http.max-persistent-connections-per-server : 2])
>> DOJO version : HEAD [10-11-06]
>>
>> Using a synchronous XMLHttpRequest while loading a big enough document (
>> greater than 65536 bytes) create a dead-lock :
>> FF wait for server response for its XMLHttpRequest and the server waits
>> for FF to read the content (document data)
>>
>> This code helps to reproduce the bug
>> <html>
>> <head>
>> <script src="dojo/dojo.js.uncompressed.js"></script>
>> <script>
>> function docLoaded() {
>> var http = dojo.hostenv.getXmlhttpObject();
>> http.open('GET',"document.xml", false);
>>
>> alert("Calling sync XMLHttpRequest - it's gonna freeze ...");
>> http.send(null);
>> alert("Well, i guess they've fixed it, response (first fragment ) is " +
>> http.responseText.substring(0, 255));
>> }
>>
>> if (document.addEventListener)
>> document.addEventListener("DOMContentLoaded", docLoaded, false);
>>
>> </script>
>> </head>
>> <body>
>> <img src="img/Sunset.jpg" width="100" />
>> <img src="img/Sunset1.jpg" width="100" />
>> <img src="img/Sunset2.jpg" width="100" />
>> <img src="img/Sunset3.jpg" width="100" />
>> <img src="img/Sunset4.jpg" width="100" />
>> </body>
>> </html>
>>
>> This is not a DOJO problem, but you can reproduce this problem with DOJO :
>> DOJO loads "required JS files" (and HTML templates) synchronously,
>>
>> Ex :
>> Try to load an HTML page (using dojo) with 2 images (the number
>> corresponds to the number of persistent connections allowed by firefox)
>> whom size are greater than 65536 bytes
>> (because FF loads 64Kb before allowing the server to send other
>> response) , you will freeze FF
>>
>> Other example on Dean Edwards Blog :
>> Try to open the link http://dean.edwards.name/weblog/2005/09/busted/ in
>> the news " Dean Edwards’ DOMContentLoaded
>> <http://dean.edwards.name/weblog/2006/06/again/> " with FireFox 1.5 (or
>> 2.0 RC2)
>>
>> This bug only appears on the HEAD version because 0.3 version does not
>> seem to use DOMContentLoaded, and window.onLoad wait for images complete
>> loading. (which is bad for DOJO perf.)
>>
>> Ariel Falduto a écrit :
>>
>>> Why this chunk of code freezes all mi firefox ???
>>>
>>> anybody knows ... im currently trying to put some animated gif when
>>> this file is loading but nothings happen cos' firefox locks everyting
>>> =(
>>>
>>> what can i do ??
>>>
>>> NOTE: the size of "tab3.html" is 1 mb
>>>
>>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
>>> "http://www.w3.org/TR/html4/strict.dtd">
>>> <html>
>>> <head>
>>> <script type="text/javascript">
>>> var djConfig = {isDebug: true};
>>> </script>
>>> <script type="text/javascript"
>>> src="scripts/dojo-0.3.1-ajax/dojo.js"></script>
>>> <script type="text/javascript">
>>> dojo.require("dojo.widget.ContentPane");
>>>
>>> function init() {
>>> var pane = dojo.widget.byId("Pane1");
>>> var status = dojo.byId("status");
>>>
>>> dojo.event.connect(dojo.byId("load"), "onclick", function(evt){
>>> // load a new url into contentPane
>>> pane.setUrl("tab3.html");
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadStart", function(evt){
>>> evt.preventDefault();
>>> dojo.debug("Download started");
>>> status.style.display = "block";
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadEnd", function(evt){
>>> // not defaultPrevent()'able
>>> dojo.debug("Download finished");
>>> status.style.display = "none"
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadError", function(evt){
>>> dojo.debug("Download error");
>>> //evt.preventDefault(); // or
>>> evt.returnValue = false;
>>> status.style.display = "none";
>>> })
>>> }
>>> dojo.addOnLoad(init);
>>> </script>
>>> </head>
>>> <body>
>>> <div id="status" style="position: absolute; top: 400px; left: 400px;
>>> display:
>>> none; background-color:yellow;">
>>> Downloading new content, please wait...
>>> </div>
>>>
>>> <a href="#" id="load">load some url into contentpane</a>
>>>
>>> <div dojoType="ContentPane" id="Pane1" style="border: 1px dotted
>>> gray;width:
>>> 200px; height:200px;">
>>> Initial content in contentpane
>>> </div>
>>> </body>
>>> </html>
>>> _______________________________________________
>>> Dojo FAQ: http://dojo.jot.com/FAQ
>>> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
>>> Dojo-interest@...
>>> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>>>
>> _______________________________________________
>> Dojo FAQ: http://dojo.jot.com/FAQ
>> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
>> Dojo-interest@...
>> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>>
> _______________________________________________
> Dojo FAQ: http://dojo.jot.com/FAQ
> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
> Dojo-interest@...
> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>
>
_______________________________________________
Dojo FAQ: http://dojo.jot.com/FAQ
Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
Dojo-interest@...
http://dojotoolkit.org/mailman/listinfo/dojo-interest
Fredrik Johansson a écrit :
> Thank you Arnaud !
>
> Very descriptive, I did'nt know that.
>
> / Fredrik
>
> torsdag 12 oktober 2006 08:25 skrev Arnaud Andrillon:
>
>> I think I have same problem :
>>
>> Browser : Firefox 1.5 (config : default [keep-alive activated,
>> network.http.max-persistent-connections-per-server : 2])
>> DOJO version : HEAD [10-11-06]
>>
>> Using a synchronous XMLHttpRequest while loading a big enough document (
>> greater than 65536 bytes) create a dead-lock :
>> FF wait for server response for its XMLHttpRequest and the server waits
>> for FF to read the content (document data)
>>
>> This code helps to reproduce the bug
>> <html>
>> <head>
>> <script src="dojo/dojo.js.uncompressed.js"></script>
>> <script>
>> function docLoaded() {
>> var http = dojo.hostenv.getXmlhttpObject();
>> http.open('GET',"document.xml", false);
>>
>> alert("Calling sync XMLHttpRequest - it's gonna freeze ...");
>> http.send(null);
>> alert("Well, i guess they've fixed it, response (first fragment ) is " +
>> http.responseText.substring(0, 255));
>> }
>>
>> if (document.addEventListener)
>> document.addEventListener("DOMContentLoaded", docLoaded, false);
>>
>> </script>
>> </head>
>> <body>
>> <img src="img/Sunset.jpg" width="100" />
>> <img src="img/Sunset1.jpg" width="100" />
>> <img src="img/Sunset2.jpg" width="100" />
>> <img src="img/Sunset3.jpg" width="100" />
>> <img src="img/Sunset4.jpg" width="100" />
>> </body>
>> </html>
>>
>> This is not a DOJO problem, but you can reproduce this problem with DOJO :
>> DOJO loads "required JS files" (and HTML templates) synchronously,
>>
>> Ex :
>> Try to load an HTML page (using dojo) with 2 images (the number
>> corresponds to the number of persistent connections allowed by firefox)
>> whom size are greater than 65536 bytes
>> (because FF loads 64Kb before allowing the server to send other
>> response) , you will freeze FF
>>
>> Other example on Dean Edwards Blog :
>> Try to open the link http://dean.edwards.name/weblog/2005/09/busted/ in
>> the news " Dean Edwards’ DOMContentLoaded
>> <http://dean.edwards.name/weblog/2006/06/again/> " with FireFox 1.5 (or
>> 2.0 RC2)
>>
>> This bug only appears on the HEAD version because 0.3 version does not
>> seem to use DOMContentLoaded, and window.onLoad wait for images complete
>> loading. (which is bad for DOJO perf.)
>>
>> Ariel Falduto a écrit :
>>
>>> Why this chunk of code freezes all mi firefox ???
>>>
>>> anybody knows ... im currently trying to put some animated gif when
>>> this file is loading but nothings happen cos' firefox locks everyting
>>> =(
>>>
>>> what can i do ??
>>>
>>> NOTE: the size of "tab3.html" is 1 mb
>>>
>>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
>>> "http://www.w3.org/TR/html4/strict.dtd">
>>> <html>
>>> <head>
>>> <script type="text/javascript">
>>> var djConfig = {isDebug: true};
>>> </script>
>>> <script type="text/javascript"
>>> src="scripts/dojo-0.3.1-ajax/dojo.js"></script>
>>> <script type="text/javascript">
>>> dojo.require("dojo.widget.ContentPane");
>>>
>>> function init() {
>>> var pane = dojo.widget.byId("Pane1");
>>> var status = dojo.byId("status");
>>>
>>> dojo.event.connect(dojo.byId("load"), "onclick", function(evt){
>>> // load a new url into contentPane
>>> pane.setUrl("tab3.html");
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadStart", function(evt){
>>> evt.preventDefault();
>>> dojo.debug("Download started");
>>> status.style.display = "block";
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadEnd", function(evt){
>>> // not defaultPrevent()'able
>>> dojo.debug("Download finished");
>>> status.style.display = "none"
>>> });
>>>
>>> dojo.event.connect(pane, "onDownloadError", function(evt){
>>> dojo.debug("Download error");
>>> //evt.preventDefault(); // or
>>> evt.returnValue = false;
>>> status.style.display = "none";
>>> })
>>> }
>>> dojo.addOnLoad(init);
>>> </script>
>>> </head>
>>> <body>
>>> <div id="status" style="position: absolute; top: 400px; left: 400px;
>>> display:
>>> none; background-color:yellow;">
>>> Downloading new content, please wait...
>>> </div>
>>>
>>> <a href="#" id="load">load some url into contentpane</a>
>>>
>>> <div dojoType="ContentPane" id="Pane1" style="border: 1px dotted
>>> gray;width:
>>> 200px; height:200px;">
>>> Initial content in contentpane
>>> </div>
>>> </body>
>>> </html>
>>> _______________________________________________
>>> Dojo FAQ: http://dojo.jot.com/FAQ
>>> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
>>> Dojo-interest@...
>>> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>>>
>> _______________________________________________
>> Dojo FAQ: http://dojo.jot.com/FAQ
>> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
>> Dojo-interest@...
>> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>>
> _______________________________________________
> Dojo FAQ: http://dojo.jot.com/FAQ
> Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
> Dojo-interest@...
> http://dojotoolkit.org/mailman/listinfo/dojo-interest
>
>
_______________________________________________
Dojo FAQ: http://dojo.jot.com/FAQ
Dojo Book: http://manual.dojotoolkit.org/DojoDotBook
Dojo-interest@...
http://dojotoolkit.org/mailman/listinfo/dojo-interest
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