1. Create a separate class that has your highlight/unhighlight behavior in it, and extend just the element you want to highlight with that class… like this (also allows you to easily apply this behavior elsewhere when you need it in the future):
Object.extend(this.el, HighlightBehaviorClass.prototype)
2. When defining your event handlers, assign them to variables so you have a handle to properly dispose of them, like this:
this.mouseOver_Listener = this.highight.bindAsEventListener(this);
Event.observe(this, "mouseover", this.mouseOver_Listener);
…now this will work…
Event.stopObserving(this, "mouseover", this.mouseOver_Listener);
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Casey O'Neill
Sent: Friday, March 03, 2006 6:09 PM
To: rails-spinoffs@lists.rubyonrails.org
Subject: [Rails-spinoffs] Question about event listener highlighting withchild elements
I have created a _javascript_ object which is initialized for some input fields, fieldsets, and divs on the page. With each object i attach a mouseover and mouseout event that highlights and un-highlights. Also on mouseout i am trying to display the id of the object to a console. The highlighting works except for cases when an object is the child of another object. In this case both are highlighted and only the parent's id is currently. I want only the child to be highlighted and the child(not parent) id to be displayed.
The second issue is stopping the event listeners when the objects are deactivated. At some point I take the list of objects and deactivate each one. In the deactivate method I Call Event.stopObserving. This seems to have no effect because the highlight method continues to be called.
Thanks for you help.
Casey
/*****************************************************************/
var secureComponent = Class.create();
secureComponent.prototype = {
idPath : 0,
console : '',
oBackgroundColor : '',
el : '',
initialize: function(value) {
this.idPath = findSecurityIdPath(value);
//Event.observe(value, 'click', this.activate.bindAsEventListener(this), false);
this.el = value;
Event.observe(value, 'mouseover', this.highlight.bindAsEventListener(this), false);
Event.observe(value, 'mouseout', this.unhighlight.bindAsEventListener(this), false);
value. false;};
this.console = $("console");
},
activate: function(){
if(this.console != null)
this.console.innerHTML =this.idPath;
},
deactivate: function(){
this.idPath = '';
this.console = '';
this.el.style.backgroundColor = this.oBackgroundColor;
Event.stopObserving(this.el, 'mouseout', this.unhighlight.bindAsEventListener (this), false);
Event.stopObserving(this.el, 'mouseover', this.highlight.bindAsEventListener(this), false);
this.el = null;
},
findSecurityIdPath: function(srcElement)
{
var el;
for (el = srcElement; el != null; el = el.parentNode)
{
if(el.attributes)
{
var idPathAttrib = el.attributes.getNamedItem("securityIdPath");
var idPath = idPathAttrib ? idPathAttrib.value : false;
if (idPath)
return idPath;
}
}
return null;
},
highlight: function(e)
{
this.oBackgroundColor = this.el.style.backgroundColor;
this.el.style.backgroundColor = "#FFFFAA";
this.log(idPath);
},
log: function(msg)
{
if(this.console != null)
this.console.innerHTML =msg;
},
unhighlight: function(e)
{
this.el.style.backgroundColor = this.oBackgroundColor;
}
}
/*****************************************************************/
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