IE7 z-index issue with incorrect stacking order

Visit this jsFiddle link.

When using IE7, the code in the jsFiddle above shows the dropdown (.sbOptions) positioned beneath the next selectbox element (.sbHolder).

Even though .sbOptions has a z-index: 100;, it is still being displayed under .sbHolder.

While this functions properly in most browsers, except for IE7, do you have any suggestions on resolving this issue?

Answer №1

Encountering an issue in IE7: When z-index is not set and hasLayout is true, a positioned element gets a stacking context assigned. The width and height of .sbHolder serve as hasLayout triggers. Consequently, the second .sbHolder appears on top.

IE7 modifies your CSS rule to:

.sbHolder {
    position: relative;
    width: 130px;
    height: 30px;
    display: block;
    margin-bottom: 20px;
    z-index: 0; /* ! */
}

This disrupts your intention to raise the z-index of .sbOptions due to it being affected by the inconsistent stacking context of .sbHolder.

I have devised a workaround for IE version 7 and below where only one .sbOptions dropdown is displayed at a time. Does this solution meet expectations? Let's hope so!

Give it a try: http://jsfiddle.net/HRubx/

The erratic stacking context is now generated when necessary:

li:hover {
    position: relative;
}

Answer №2

For me, getting jsfiddle to work in IE7 required continuously adding Z-index 1.

Have you experimented with using zoom:auto in various places? It might help - consider adding it to the css.

Additionally, the relationship between z-index and absolute positioning can be contradictory. Absolute positioning removes the element from the document flow, making z-index distinctions less clear-cut.

It could be worth exploring alternative positioning techniques...

Answer №3

Check out this helpful article for a solution to IE7 z-index issues.

To summarize, the article suggests using jQuery to rearrange z-index values of elements:

An effective way to address IE7 issues is to dynamically reverse the default z-index stacking order of elements on your page. This strategy ensures that elements higher in the HTML source will also have a higher z-index order, resolving most of the stacking problems in IE.

$(function() {
    var zIndexNumber = 1000;
    $('div').each(function() {
        $(this).css('zIndex', zIndexNumber);
        zIndexNumber -= 10;
    });
});

Answer №4

Hey there buddy, if you're looking to make a small change in your markup, just include a z-index in the parent div like this:

<div class="holderBox" style="z-index:11">
    <a href="#" class="toggleButton"></a>
    <a href="#" class="selectorButton">1</a>

    <ul class="optionsList">
         <li><a href="#1">1</a></li>
         <li><a href="#2">2</a></li>
         <li><a href="#3">3</a></li>
         <li><a href="#4">4</a></li>
    </ul>
</div>

<div class="holderBox" style="z-index:10">
    <a href="#" class="toggleButton"></a>
    <a href="#" class="selectorButton">A</a>

    <ul class="optionsList">
        <li><a href="#1">A</a></li>
        <li><a href="#2">B</a></li>
        <li><a href="#3">C</a></li>
        <li><a href="#4">D</a></li>
    </ul>
</div>

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