Enhance your webpage by incorporating a CSS subclass using jQuery's addClass

Attempting to apply a subclass to a class using jQuery has proven tricky. The CSS in question is as follows:

.block:nth-child(7) .permahover {
   top: 0 !important; 
   left: 0 !important;
   opacity: 0;
   filter: alpha(opacity=0);
  -webkit-transform: translate(0, 0) !important;
      -ms-transform: translate(0, 0) !important;
          transform: translate(0, 0) !important
}

Meanwhile, here is the corresponding JavaScript for reference:

$(".block:nth-child(7)").mouseenter(function () {
    $(".block:nth-child(7)").addClass("permahover");
});

An issue arises when attempting to remove the ".block:nth-child(7)" from the class name and leaving it simply as ".permahover." While this workaround does work, it is necessary for the subclass to remain intact. I have attempted replacing ".addClass("permahover")" with ".addClass("block:nth-child(7) .permahover")," but as anticipated, it did not yield the desired outcome. Is there a potential solution to this dilemma? If not, are there any alternative methods available (even if they necessitate abandoning the use of jQuery)?

javascriptjquerycsssubclassaddclass

Answer №1

Adding a pseudo-class to a DOM element is not possible. It would be impractical to add the ":nth-child(7)" class to an element that is not the seventh child of its parent.

For your issue, you don't need it at all. Just remove the space before ".permahover".

.block:nth-child(7).permahover {
   top: 0 !important; 
   left: 0 !important;
   opacity: 0;
   filter: alpha(opacity=0);
  -webkit-transform: translate(0, 0) !important;
      -ms-transform: translate(0, 0) !important;
          transform: translate(0, 0) !important
}

If you keep the space there, your CSS rule will target a child element with the permahover class inside the 7th block.

<div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block permahover"></div> <!-- .block:nth-child(7).permahover  { ... } -->
</div>

<div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block">
        <div class="permahover"></div> <!-- .block:nth-child(7) .permahover { ... } -->
    </div>
</div>

Avoid duplicating the jQuery query as well:

$(".block:nth-child(7)").mouseenter(function () {
    $(this).addClass("permahover");
});

If you want to add the .permahover class to a child element, you can achieve this by:

$(".block:nth-child(7)").mouseenter(function () {
    $(" > *", this).addClass("permahover");
});

Answer №2

The CSS rule you have indicates a .block class which is the 7th child containing a child element with class .permahover. To achieve this, you should use:

.block:nth-child(7).permahover { ... }

This targets an element that has both .block and .permahover classes and is the 7th child.

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