Anyone who has hooked into the resize event of the window object in Internet Explorer knows the pain - the event is fired twice for every single movement (once for horizontal and once for vertical). To make matters worse, if you drag the window size it doesn't get fried twice at the end, it gets fired numerous times throughout the resize. The result of this is that if you are hooked into the event and are resizing some other elements (and probably re-rendering them too), performance suffers and the page seems unresponsive.
Luckily there is a relatively straight-forward resolution to this:
Sys.Application.add_load(function(sender, args) {
$addHandler(window, 'resize', window_resize);
});
var resizeTimeoutId;
function window_resize(e) {
window.clearTimeout(resizeTimeoutId);
resizeTimeoutId = window.setTimeout('doResizeCode();', 10);
}
Essentially you queue up the resize handling code, and then if the window resize occurs again, you cancel it, and re-queue it. This keeps happening until the resize is complete, at which point, your doResizeCode() function is actually executed.
