Implement a color overlay effect by adjusting the z-index property when a checkbox is selected

There is a checkbox that will select a table containing product information. When this item is selected, a CSS style overlays the table with a 30% color tint to indicate it has been chosen.

By using only CSS and jQuery, I can apply a style with a higher z-index than the image being used for the visual overlay. The overlay style correctly displays the z-index, but does not appear over the image.

Even after setting the z-index of the image to a -10 value in jQuery, it still remains on top of the colored div. I attempted to force the div to a z-index of 105 within the same jQuery code, but it does not display over the lower-z-indexed image.

I suspect that the issue lies in the fact that the div with the higher z-index is repositioning everything inside it, causing the nested image to also move up in z-index level.

In this case, what would be the best approach to overlay a series of dynamically generated tables with a 30% opacity style?

UPDATED WORKING CODE:

 $(function ()
    {          
        $("input[type='checkbox']").change(function ()
        {
            if ($(this).is(":checked"))
            {
                $(this).parent().addClass("jobSelected");
            } else
            {
                $(this).parent().removeClass("jobSelected");
            }
        });
    });   
</script>

<style type="text/css">
.jobSelected {
    background-color: hsla(0,0%,0%,0.50);
    position: relative;
}
</style>

UPDATED WORKING CODE:

<div>
  <table  cellpadding="6" cellspacing="0" border="0" width="100%">
    <thead>
      <tr>
        <td> Item 1 </td>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><img src="http://sgdesign.com/temp/temp1.png" alt="" style="z-index:-1; position:relative;"></td>
      </tr>
    </tbody>
  </table>
  <input type="checkbox" name="checkbox" id="checkbox">
  Select </div>


<br>
<br>


<div>
  <table  cellpadding="6" cellspacing="0" border="0" width="100%">
    <thead>
      <tr>
        <td > Item 2 </td>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td valign="top" style="border-left:0px none;padding-left:12px;"><img src="http://sgdesign.com/temp/temp2.png" alt="" style="z-index:-1; position:relative;"></td>
      </tr>
    </tbody>
  </table>

    <input type="checkbox" name="checkbox2" id="checkbox2">
  Select </div>

The provided code successfully sets the expected values as seen through browser Inspect Element, but the desired results are not achieved.

Answer №1

Indeed, the Z-index adjustments do not flow down in a cascading manner when you are working with a table structure. To overcome this limitation, it is advisable to directly modify the z-index on the specific div element where it is required.

You can experiment with changing your CSS code as follows:

.jobSelected {
    background-color: hsla(0,0%,0%,0.30);
    position: relative;
}

.jobSelected div.overlay {
    z-index: 50;
}

Don't forget to update your HTML accordingly:

    <tr>
    <td valign="top" style="border-left:0px none;padding-left:12px;">
        <div style="z-index:100; position:relative;" class="overlay">
            <img src="http://sgdesign.com/temp/temp1.png" alt="" style="z-index:-1; position:relative;">
        </div>
    </td>
    </tr>

Answer №2

To ensure success, it is essential to eliminate any elements that may have a higher z-value than the dynamically updated value in your selection.

For example:

  <tr>
    <td valign="top" style="border-left:0px none;padding-left:12px;">
        <div style="z-index:100; position:relative;" class="overlay">
            <img src="http://sgdesign.com/temp/temp1.png" alt="" style="z-index:-1; position:relative;">
        </div>
    </td>
    </tr>

In this scenario, there is a div wrapping the image with a z-index of 100, whereas the jquery-assigned css has a value of 50. By removing the div with the z-index of 100, the updated css from jquery at 50 can overlay correctly.

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