Utilizing JavaScript to trigger the :hover pseudo-class and implement event transfers

Consider this situation:

You have a scenario where two images are stacked on top of each other. The image with the highest z-index is transparent and handles click events, similar to Google's Map API, while the image below is for visual representation.

Below is a sample pseudo code in HTML/CSS:

div.visual-container {
    width: 10px;
    height: 10px;
}

div.visual-container:hover {
    background-color: #555;
}

div.click-container {
    width: 10px;
    height: 10px;
}

<div class='lowest'>
    <div class='visual-container'></div>
</div>

<div class='highest'>
    <div class='click-container'></div>
</div>

When the 'highest' element is clicked, the event is triggered on the 'lowest' element as well.

The main concept:

function onHoverEventForHighest() {
    createMouseEvent(lowest_element, 'mouseover', event);
};

This part works fine and transfers the event accordingly, but it does not activate the :hover CSS pseudo-class.

Has anyone successfully implemented something like this before?

javascripthtmlcssdom

Answer №1

When it comes to the :hover pseudo-class, reliability isn't always its strong suit. In addition, controlling its behavior through JavaScript can be a bit tricky.

According to the W3C's specifications found in the W3C's spec, the :hover pseudo-class is meant to be activated only when initiated by the user. Here's a quote from the spec:

The :hover pseudo-class applies while the user designates an element (with some pointing device), but does not activate it. For example, a visual user agent could apply this pseudo-class when the cursor (mouse pointer) hovers over a box generated by the element. User agents not supporting interactive media do not have to support this pseudo-class.

In order to work around this limitation, one approach would be to assign a specific class (such as .hover) using a function tied to the mouseover and mouseout events for the desired elements.

On another note, restructuring your markup into a hierarchical or nested format could potentially simplify handling these events, allowing the DOM to bubble them automatically. Alternatively, you may find tips on how to manually propagate mouse events through absolutely positioned elements in this Stack Overflow question and answer.

Answer №2

After reading Jason's insightful comments on nesting elements, I came up with the following CSS solution:

<style type="text/css">
div.visual-container {
    width: 10px;
    height: 10px;
}

.widget-container:hover div.visual-container {
   background-color: #555;
}

div.click-container {
    width: 10px;
    height: 10px;
}
</style>
...
<div class="widget-container">
  <div class='lowest'>
    <div class='visual-container'></div>
  </div>
  <div class='highest'>
    <div class='click-container'></div>
  </div>
</div>

Perhaps this approach aligns with what Jason was alluding to. As he rightly pointed out, manipulating pseudo-classes through the DOM can be tricky, but in this case, a purely stylistic solution suffices for our needs.

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