One John

Just ran into this bug in FireFox: https://bugzilla.mozilla.org/show_bug.cgi?id=412112. Basically, if you do a synchronous call on an XMLHttpRequest object, the onreadystatechange function is not called. So the following code doesn’t work.

var request = new XMLHttpRequest();
request.onreadystatechange = function () {
if (request.readyState == 4)
  if (request.status == 200) alert('request successful')
};
request.open("GET", "/index.html", false); /* the false here makes it synchronous *
request.send(null);

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I was working on an interesting little project involving the Google Website Optimizer and ran into this little gem.

The task was to use JavaScript to rewrite a page that was formatted using tables and was sometimes missing a row that spanned the whole table. Now I have to admit that I am not a JS or DOM pro, But I’ve picked up though some experience through this and a couple other tasks. So here is the base HTML: (more…)