The stacking order of a child element within a parent element, which has a transform

Hey there, I've encountered a problem and was wondering if you could assist me with it.

In the code snippet provided below, you'll see that there are elements with:

transform: translate(0,0);

Within these elements, there is a "dropdown" element that appears upon clicking a button.

The issue arises when parts of this dropdown end up hidden behind other elements. After some investigation, I realized that this is due to the parent element having the transform property.

This is just a simplified example; my actual code is more extensive. Unfortunately, I'm unable to remove the transform property.

Is there a CSS-only solution to this dilemma? Your insights would be greatly appreciated!

Cheers!!

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0);
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
}

.template-options-dropdown.open {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>
  <li><div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div></li>
  … (content continues)
</ul>

htmlcssz-indexcss-transforms

Answer №1

It seems that finding a CSS-only solution to this problem may be challenging due to the creation of a new stacking context by CSS3 transitions. For more information, refer to the documentation and this thread.

If a property has a non-none value, it will create a stacking context.

Source: MDN

To address this issue, you can replace translate(0,0) with position: relative and add a z-index greater than zero to .template-options-dropdown for resolution.

A somewhat unconventional approach that alters the layout is to introduce additional transforms:

  1. Invert the appearance order of the list by applying scaleY(-1) to the ul, as higher indexed list items will overlap lower ones.

  2. Add a reversing scaleY(-1) to the li elements to restore normalcy.

  3. Additionally, clear the floats on the li elements.

Check out the demonstration below:

$(document).ready(function() {
$('button[name="button"]').click(function(e) {
$(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
});
});
.boxes {
list-style-type: none;
transform: scaleY(-1);
}
.boxes:after {
content: '';
clear: both;
display: block;
}

.boxes >li {
float: left;
width: 100px;
height: 100px;
background-color: red;
margin: 5px;
transform: translate(0, 0) scaleY(-1);
}

.download-container {
background: rgba(40, 39, 39, 0.8);
bottom: 0;
position: absolute;
text-align: center;
width: 100%;
}

.download-container .dropdown-container {
display: inline-block;
position: relative;
}

.download-container .dropdown-container button {
background: #0bb9ab;
color: #fff;
padding: 6px 12px;
}

.template-options-dropdown {
list-style-type: none;
text-align: left;
padding: 0;
position: absolute;
background-color: #111;
visibility: hidden;
}

.template-options-dropdown.open {
visibility: visible;
}

.template-options-dropdown li a {
color: white;
text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
<li>
<div class="download-container">
<div class="dropdown-container">
<button type="button" name="button">Download</button>

<ul class="template-options-dropdown">
<li>
<a href="#">Original</a>
</li>
<li>
<a href="#">Thumb</a>
</li>

...

</li>
</ul>
</div>
</div></li>

...

</li>
</ul>

If removing translate(0,0) proves futile, resorting to JavaScript may be necessary:

  1. Reverse the stacking order by assigning a z-index corresponding to the list index.

  2. Apply position:relative to the li elements.

Explore the demo provided below:

$(document).ready(function() {

// ADDED
$($('ul.boxes > li').get().reverse()).each(function(index){
$(this).css('z-index', index);
});

$('button[name="button"]').click(function(e) {
$(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
});
});
.boxes {
list-style-type: none;
}

.boxes >li {
float: left;
width: 100px;
height: 100px;
background-color: red;
margin: 5px;
transform: translate(0, 0);
position: relative;
}

.download-container {
background: rgba(40, 39, 39, 0.8);
bottom: 0;
position: absolute;
text-align: center;
width: 100%;
}

.download-container .dropdown-container {
display: inline-block;
position: relative;
}

.download-container .dropdown-container button {
background: #0bb9ab;
color: #fff;
padding: 6px 12px;
}

.template-options-dropdown {
list-style-type: none;
text-align: left;
padding: 0;
position: absolute;
background-color: #111;
visibility: hidden;
}

.template-options-dropdown.open {
visibility: visible;
}

.template-options-dropdown li a {
color: white;
text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">

...

</ul>

Answer №2

When using the <code>z-index property, remember that it will only work on elements with a position of absolute, fixed, or relative. Therefore, make sure to set the position of the element to relative.

If you have a fixed number of elements, consider assigning z-index values in the following manner:

.boxes li:nth-child(1) {
  z-index: 8;
}

.boxes li:nth-child(2) {
  z-index: 7;
}

... (continue for the rest of the elements)

Alternatively, for an unknown number of elements, you can use a script to apply z-index dynamically. Here's an example:

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parent().find('.template-options-dropdown').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0);
  position: relative;
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

... (continue with the CSS styles)

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
 ... (example HTML structure)
</ul>

Answer №3

You're almost there, but if it were up to me, I would apply the .open class either to the <li> element or the div.download-container. By setting a high z-index value and utilizing the cascade effect, we can reveal the sub-menu. Remember to include position:relative; on the element with the z-index property for it to take effect.

Here's an example:

$(document).ready(function() {
  $('button[name="button"]').click(function(e) {
    $(e.currentTarget).parents('li').toggleClass('open');
  });
});
.boxes {
  list-style-type: none;
}

.boxes >li {
  float: left;
  width: 100px;
  height: 100px;
  background-color: red;
  margin: 5px;
  transform: translate(0, 0);
  position:relative;
}

.boxes >li.open {
    z-index:500;
}

.download-container {
  background: rgba(40, 39, 39, 0.8);
  bottom: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

.download-container .dropdown-container {
  display: inline-block;
  position: relative;
}

.download-container .dropdown-container button {
  background: #0bb9ab;
  color: #fff;
  padding: 6px 12px;
}

.template-options-dropdown {
  list-style-type: none;
  text-align: left;
  padding: 0;
  position: absolute;
  background-color: #111;
  visibility: hidden;
}

.boxes li.open .template-options-dropdown {
  visibility: visible;
}

.template-options-dropdown li a {
  color: white;
  text-decoration: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="boxes">
  <li>
    <div class="download-container">
      <div class="dropdown-container">
        <button type="button" name="button">Download</button>

        <ul class="template-options-dropdown">
          <li>
            <a href="#">Original</a>
          </li>
          <li>
            <a href="#">Thumb</a>
          </li>
          <li>
            <a href="#">Mobile</a>
          </li>
          <li>
            <a href="#">Tab</a>
          </li>
          <li>
            <a href="#">Web</a>
          </li>
          <li>
            <a href="#">Large web</a>
          </li>
        </ul>
      </div>
    </div>
  </li>

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