SHARE THIS PAGE

JS & DOM Reference

Overview

JavaScript Objects

JS Array JS Boolean JS Date JS Math JS Number JS String JS RegExp JS Global

Browser Objects

Window Navigator Screen History Location

Core DOM Objects

DOM Node DOM NodeList DOM NamedNodeMap DOM Document DOM Element DOM Attr

HTML DOM Objects

DOM Document DOM Events DOM Elements
DOM Anchor DOM Area DOM Base DOM Body DOM Button DOM Form DOM Frame/IFrame DOM Frameset DOM Image DOM Input Button DOM Input Checkbox DOM Input File DOM Input Hidden DOM Input Password DOM Input Radio DOM Input Reset DOM Input Submit DOM Input Text DOM Link DOM Meta DOM Object DOM Option DOM Select DOM Style DOM Table DOM td / th DOM tr DOM Textarea

Style zIndex Property

Style Object

Definition and Usage

The zIndex property sets or returns the stack order of a positioned element.

An element with greater stack order (1) is always in front of another element with lower stack order (0).

Tip: A positioned element is an element with the position property set to: relative, absolute, or fixed.

Syntax

Set the zIndex property:

Object.style.zIndex="auto|number|inherit"

Return the zIndex property:

Object.style.zIndex

Value	Description
auto	The browser determines the stack order of the element (based on its order in the document). This is default
number	An integer that defines the stack order of the element. Negative values are allowed
inherit	The value of the zIndex property is inherited from parent element

Browser Support

The zIndex property is supported in all major browsers.

Tips and Notes

Tip: This property is useful if you want to create overlapping elements.

Example

Change the stack order of an <img> element:

<html>
<head>
<style type="text/css">
#img1
{
position:absolute;
left:0px;
top:0px;
z-index:-1
}
</style>
<script>
function changeStackOrder()
{
document.getElementById("img1").style.zIndex="1";
}
</script>
</head>
<body>

<h1>This is a Heading</h1>

<img id="img1" src="bulbon.gif" width="100" height="180">

<input type="button" onclick="changeStackOrder()" value="Change stack order">

<p>Default z-index is 0. Z-index -1 has lower priority.</p>

</body>
</html>

Try it yourself »

Style Object