Relationships Among zIndex Values (W3C) : Layer « HTML « JavaScript DHTML

Relationships Among zIndex Values (W3C)

JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001

function setZ(field) {
    switch ( {
        case "top" :
            document.getElementById("topLayer").style.zIndex = parseInt(field.value)
        case "mid" :
            document.getElementById("middleLayer").style.zIndex = parseInt(field.value)
        case "bot" :
            document.getElementById("bottomLayer").style.zIndex = parseInt(field.value)
function showValues() {
    var botLayer = document.getElementById("bottomLayer")
    var midLayer = document.getElementById("middleLayer")
    var topLayer = document.getElementById("topLayer")
    document.forms[0].bot.value =
    document.forms[1].mid.value =
    document.forms[2].top.value =
<BODY onLoad="showValues()">
<H1><TT></TT> Property of Sibling Layers</H1>
Enter new zIndex values to see the effect on three layers.<P>
<DIV STYLE="position:absolute; top:140; width:240; background-color:coral">
Control Original Bottom Layer:<BR>

<TR><TD ALIGN="right">Layer zIndex:</TD><TD><INPUT TYPE="text" NAME="bot" SIZE=3
<DIV STYLE="position:absolute; top:220; width:240; background-color:aquamarine">
Control Original Middle Layer:<BR>
<TR><TD ALIGN="right">Layer zIndex:</TD><TD><INPUT TYPE="text" NAME="mid" SIZE=3
<DIV STYLE="position:absolute; top:300; width:240; background-color:yellow">
Control Original Top Layer:<BR>
<TR><TD ALIGN="right">Layer zIndex:</TD><TD><INPUT TYPE="text" NAME="top" SIZE=3
<DIV ID="bottomLayer" STYLE="position:absolute; top:140; left:260; width:300;
 height:190; z-Index:0; background-color:coral">
    <SPAN><B>Original Bottom Layer</B></SPAN>
<DIV ID="middleLayer" STYLE="position:absolute; top:160; left:280; width:300;
 height:190; z-Index:0; background-color:aquamarine">
    <SPAN><B>Original Middle DIV</B></SPAN>
<DIV ID="topLayer" STYLE="position:absolute; top:180; left:300; width:300;
 height:190; z-Index:0; background-color:yellow">
    <SPAN><B>Original Top Layer</B></SPAN>


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