The onmouseover event handler is used for generating various kinds of interactivity on web pages. It’s most often used for image rollovers. Image change on mouse over is actually quite simple once we understand the logic.
Here are the two images I made:
icon1.gif: Image for Mouse Out
icon2.gif: Image for Mouse Over
We’ll now construct an image tag and give the image a name using its NAME attribute.
<IMG SRC="icon1.gif" NAME="but" WIDTH="100" HEIGHT="50" BORDER="0" ALT="...">
We use icon1.gif as the value for the SRC attribute since this is the image used for mouseout. The image is named but.
The two event handlers are placed inside the starting <A> tag.
<A HREF="some.html" onmouseover="document.but.src='icon2.gif'" onmouseout="document.but.src='icon1.gif'"> <IMG SRC="icon1.gif" NAME="but" WIDTH="100" HEIGHT="50" BORDER="0" ALT="..."> </A>
As you would have guessed, images are a part the document object. The src property of the image object determines the source of the image.
The email message in which Marc Andreessen announced the release of NCSA X Mosaic browser hasn't been lost in time. It still exists! Though there were other web browser before it, Mosaic is generally credited to have made the "WWW explosion". [more...]