I have 2 z-index layers in a map application I'm building. I have a problem when I click on the layers to zoom in. The click handler is on the underlying z-index layer and I don't want it to fire when a control in the overlying layer is clicked.
The problem i have is that the event gets raised no matter what but the originalTarget property of the event is not the image in the underlying layer when something on the top layer is clicked. Is there anyway to change this?
I have 2 z-index layers in a map application I'm building. I have a problem when I click on the layers to zoom in. The click handler is on the underlying z-index layer and I don't want it to fire when a control in the overlying layer is clicked.
The problem i have is that the event gets raised no matter what but the originalTarget property of the event is not the image in the underlying layer when something on the top layer is clicked. Is there anyway to change this?
Share Improve this question edited Feb 23, 2010 at 16:55 Robert Cartaino 28.1k6 gold badges46 silver badges67 bronze badges asked Jun 22, 2009 at 8:23 AlexAlex 36.6k11 gold badges56 silver badges68 bronze badges5 Answers
Reset to default 9It's called event-bubbling, and you can control it with the event.stopPropagation() method (event.cancelBubble() in IE). You can also control it by returning true/false from handlers called by onwhatever attributes on elements. It's a tricky subject so I suggest you do some research.
Info: cancelBubble, stopPropagation
Although this does not address the problem directly it may be a viable workaround until a more fitting solution presents itself.
Write a single function to be called onClick and allow the function enough smarts to know who called it. The function then takes the appropriate action based upon who clicked it. You could send it pretty much anything that would be unique and then use a switch.
simplified example :
<html>
<body>
<script type="text/javascript">
function myClickHandle(anID)
{
switch(anID){
case 'bottom':
alert("I am on the bottom");
break;
case 'top':
alert("I am on the top");
break;
}
}
</script>
<html>
<div style="z-index:10"><input type=button value='top' onclick="myClickHandle(this.value)"/></div>
<div style="z-index:11"><input type=button value='bottom' onclick="myClickHandle(this.value)"/></div>
</body>
</html>
or, one more workaround could be using CSS property pointer-events: none; on div's you don't want to click, and then on deeper nested components use pointer-events: all; on div's you want to be able to click.
This way you could propagate event to desired component (if there is a reason you cannot use other solution)
I think the best practice is to detach the event handler when the control moves to the upper layer and when the control gets back to the lower layer, you can reattach the events.
priority to the element who has the great z-index
http://api.jquery.com/event.stopPropagation/