Hi Yasmin,
your code sample was:
Element element = doc.getElementById("circleGroup");
EventTarget eventTarget = (EventTarget) element;
eventTarget.addEventListener("click",new CircleAction(),false);
class CircleAction implements EventListener
{
public void handleEvent(Event evt)
{
Element elt = (Element) evt.getCurrentTarget();
if (evt.getType() == "click")
{
elt.setAttributeNS("circle","fill","yellow");
}
}
In here, you add a listener to a group(?) and afterwards, when the group
is clicked, try to set the attribute "fill" on the element "elt" in the
namespace "circle" to yellow.
Instead, what (I believe) you want to do is to set the attribute on the
element circle.
I have not tested it (and am not familiar with the W3C DOM API either,
using dom4j mainly), but maybe you could change the listeners code to:
> Element elt = (Element) evt.getCurrentTarget();
> Element circleElement = elt.getElementByTagName("circle")
> if (evt.getType() == "click") {
> circleElement.setAttributeNS(null,"fill","yellow");
> }
Oh, and maybe check for the eventtype before doing anything else,
possible saving some time at runtime.
I've not followed your discussion in detail,
but maybe you can have a look at this class from my project:
http://cvs.sourceforge.net/viewcvs.py/anathema/CharmTree/src/net/sf/anathema/charmtree/listening/CharmTreeListening.java?view=markup
Within, you'll find two EventListeners,"cursorTooltipInitListener" and
"selectionInvokingListener". The former acts on mouseover, but the
latter reacts on mouseclick events for the element it's over.
Within, the first part retrieves the target element.
(Ignore the special case of an TSpan-Element being clicked)
Then, an element ID is read from the synonymous attribute,
finally, an event is fired.
Basically, you could use this (or very simliar code) for parsing the
document whenever a click event occurs and locating the target element
by hand, thus making sure you got the circle and only the circle to
operate upon.
I guess they're way to complicated for what you intend to do, but maybe
they can help you figure out how to do it by stripping things away.
Good luck with your task
-Urs
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