Dealing with click events on layers with z-index positioning

In the map application I am developing, I have implemented 2 z-index layers. However, a problem arises when attempting to zoom in by clicking on these layers. The click handler is located on the lower z-index layer and I do not want it to execute when a control on the higher layer is clicked.

The issue at hand is that the event always triggers, but the originalTarget property of the event does not correspond to the image in the lower layer when an element on the top layer is clicked. Is there a way to resolve this inconsistency?

javascriptevent-handlingz-index

Answer №1

Event-bubbling is the term used to describe how events are propagated through the DOM. You have control over this using methods like event.stopPropagation() or event.cancelBubble() in IE. You can also influence event bubbling by returning true or false from handlers triggered by onwhatever attributes on elements. To understand more about this topic, I recommend conducting some research.

Additional information: cancelBubble, stopPropagation

Answer №2

While this may not provide a direct solution to the issue at hand, it can serve as a temporary workaround until a more suitable remedy is found.

Create a single function that is triggered onClick and equip the function with the intelligence to determine who invoked it. The function will then execute the appropriate action based on the caller. You can pass in any unique identifier and use a switch statement to handle different cases.

Here is a 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>

Answer №3

Alternatively, you could implement a different approach by utilizing the CSS property pointer-events: none; on specific div elements where you do not want clicking functionality. Then, for nested components within these divs, apply pointer-events: all; to allow clicking on those particular areas.

This method provides a workaround for directing events to the intended component in cases where other solutions are not feasible.

Answer №4

In my opinion, the optimal approach is to remove the event handler when the control transitions to a higher layer and then reattach it when the control returns to a lower layer.

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