jquery - z-index order for draggable div

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jquery - z-index order for draggable div

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

jquery - z-index order for draggable div

I want to create draggable a media player (blue box in my example) in my website and I need to put media player in front of all divs. How can i do this?

My page template is like that:

You can try it: http://jsfiddle.net/krMhY/

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />  
    <title>Popup Test</title>


    <script src="js/jquery.js" type="text/javascript"></script>
    <script src="js/jquery.ui.full.js" type="text/javascript"></script>

    <style type="text/css">
        .contents
        {position:fixed; bottom:0; left: 0; right:0; top:100px;}

        .resizableArea
        {position:absolute; bottom:0; top:0; width:100%;}

        .resizableArea .leftSection
        {position:relative; float:left; width: 150px; height:100%;}

        .resizableArea .splitter
        {position: absolute; left: 150px; width: 4px; height: 100%;}

        .resizableArea .rightSection
        {position: relative; overflow: auto; height: 100%;}    
    </style>
  </head>
  <body                               style="z-index: 1; background-color: purple;">
    <div class="contents"             style="z-index: 2; background-color: black;">
        <div class="resizableArea"    style="z-index: 3; background-color: aqua;">
            <div class="leftSection"  style="z-index: 4; background-color: yellow;">&nbsp;</div>
            <div class="splitter"     style="z-index: 7; background-color: green;">&nbsp;</div>
            <div class="rightSection" style="z-index: 6; background-color: red;">&nbsp;<br />
                <div id="drag"        style="z-index: 8; background-color: blue; width: 100px; height: 100px;">&nbsp;</div>
            </div>
        </div>
    </div>

    <script language="javascript" type="text/javascript">
        $("#drag").draggable();
    </script>
  </body>
</html>

Thanks all...

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:56:12+0000

If none of the other elements have a defined z-index, using z-index: 1 will be fine.

Model: How is the z-index determined?

                                         z-index
<div id=A>                                Auto 1
    <div id=B>                            Auto 1.1
       <div id=C style="z-index:1"></div>          Manual 1
       <div id=D></div>                   Auto 1.1.2
    </div>                                
    <div id=E></div>                      Auto 1.2
</div>
<div id=F></div>                          Auto 2

First, the direct child nodes of the body are walked through. Two elements are encountered: #A and #F. These are assigned a z-index of 1 and 2. This step is repeated for each (child) element in the document.

Then, the manually set z-index properties are checked. If two z-index values equal, their position in the document tree are compared.

Your case:

<div id=X style="z-index:1">          Z-index 1
    <div id=Y style="z-index:3"></div> Z-index 3
</div>
<div id=Z style="z-index:2"></div>    Z-index 2

You'd expect #Y to overlap #Z, because a z-index of 3 is clearly higher than 2. Well, you're wrong: #Y is a child of #X, with a z-index of 1. Two is higher than one, and thus, #Z will be shown over #X (and #Y).

The same concept can be easily visualized in this plunker: http://plnkr.co/edit/CCO4W0NS3XTPsVL9Bqgs?p=preview

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jquery - z-index order for draggable div

jquery - z-index order for draggable div

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1 Answer

Model: How is the z-index determined?

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