CODEWITHSUNDEEP
javascriptevent-handlingz-index
Alex
Alex

Reputation: 36596

Handling click events on z-index'd layers

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?

Upvotes: 7

Views: 36627

Answers (5)

Dominik Januvka
Dominik Januvka

Reputation: 49

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)

Upvotes: 1

SpliFF
SpliFF

Reputation: 39004

It'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

Upvotes: 9

Mythos
Mythos

Reputation: 11

priority to the element who has the great z-index

http://api.jquery.com/event.stopPropagation/

Upvotes: 0

Shreyas
Shreyas

Reputation: 1462

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.

Upvotes: 0

Cranium Slows
Cranium Slows

Reputation: 224

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>

Upvotes: 1

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