onmouseover (HTML attribute)
| IE5.5+ | FF1+ | Saf1.3+ | Op9.2+ |
|---|---|---|---|
| Full | Full | Full | Full |
| Depr. | Version |
|---|---|
| No | HTML 4 |
Example
The example below shows a simple image swap technique, whereby mousing over the image causes the image to change to one that reveals a location on a map:
<div>
<img src="map.gif" alt="Hover to reveal the location on the map"
onmouseover="this.src='map_location_revealed.gif';"
onmouseout="this.src='map.gif';"/>Figures for February’s racing.
</div>
Description
The
onmouseover attribute is one of the most commonly
used event attributes. It captures the moment that a cursor crosses the
boundary of an element, moving from outside to inside the element to which
the attribute is applied. It differs from the onmousemove attribute, which is used to detect movement
within the element’s boundaries. Once the cursor is positioned over the
element, the onmouseover event remains active until
the cursor is moved beyond the element’s boundaries—an event that the
onmouseout attribute would capture.
The
onmouseover attribute is mostly used to render
visual effects such as image swapping or color changes, and has been used
in this way for almost as long as JavaScript has been
around.
Value
This attribute has no fixed value.
It’s up to the author to decide on the scripting that’s included here, be
that a call to one or more defined functions, or a simple
alert() statement.
Compatibility
| IE | 5.5 | Full |
|---|---|---|
| 6.0 | Full | |
| 7.0 | Full | |
| Firefox | 1.0 | Full |
| 1.5 | Full | |
| 2.0 | Full | |
| Safari | 1.3 | Full |
| 2.0 | Full | |
| 3.0 | Full | |
| Opera | 9.2 | Full |
Every browser listed supports this attribute. However, it should be avoided as it encourages the mixing of content and behavior.
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