> Henrik,
>
> This code looks good when executed by the over-head projector, but it
> can be very slow when executed by a browser on a large page.
>
> The implementation (Behaviour, or event:Selector) needs to find the
> elements that match the selector. Say your selector is "a.clazz", it
> needs to find all the <a> that have a class="clazz" (with maybe other
> classes). Unfortunately there is no way to do this efficiently with
> the DOM API on large pages. YUI have methods to do this, that are
> maybe more efficient than what one would write without thinking too
> much about performance, but those methods are still slow. So it is
> better to avoid (and I think now we completely got rid of) code that
> does things like looking for all the <a> with class "clazz".
>
> Alex
>
> On 12/19/06, Henrik Pettersen <[hidden email]> wrote:
> > All,
> >
> > I came across this rather neat way of handling events using css selectors:
> > http://encytemedia.com/event-selectors/
> >
> > Perhaps this could be used for templating xforms controls?
> >
> >    '#hover-text a:mouseover': function(element) {
> >        /* the rest follows from onmouseover in xforms.css (848)*
> >         var target =
> > ORBEON.xforms.Events._findParentXFormsControl
> > (YAHOO.util.Event.getTarget(event));
> >         if (target != null) {
> >
> >             if (ORBEON.util.Dom.hasClass(target, "xforms-help-image")) {
> >                 // Show help tool-tip
> >                 var label = target.nextSibling;
> >                 while (!ORBEON.util.Dom.isElement(label))
> > label = target.nextSibling;
> >                 var control = document.getElementById(label.htmlFor);
> >                 ORBEON.xforms.Events._showToolTip (event,
> > label, "xforms-help",
> > ORBEON.xforms.Controls.getHelpMessage(control));
> >             } else if (ORBEON.util.Dom.hasClass(target,
> > "xforms-alert-active")) {
> >                 var control = document.getElementById (target.htmlFor);
> >                 var message =
> > ORBEON.xforms.Controls.getAlertMessage(control);
> >                 if (message != "") {
> >                     // Show alert tool-tip
> >                     ORBEON.xforms.Events._showToolTip
> > (event, target, "xforms-alert",
> > ORBEON.xforms.Controls.getAlertMessage(control));
> >                 }
> >             }
> >         }
> >
> >    },
> >
> >    '#icons a:mouseout': function(element) {
> >         /* the rest follows from onmouseover in xforms.css (848)*
> >         var target =
> > ORBEON.xforms.Events._findParentXFormsControl(YAHOO.util.Event.getTarget(event));
> >         if (target != null) {
> >
> >             // Hide help
> >             if (ORBEON.util.Dom.hasClass(target, "xforms-help-image")
> >                     || ORBEON.util.Dom.hasClass(target,
> > "xforms-alert-active"))
> >                 tt_Hide();
> >         }
> >    }
> >
> > I'm going to give them a whirl.
> >
> > Henrik
> >
> >
> >
> >
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