Windows uses tooltips; they're also commonly found on web pages. This article shows you how to use dojo to render tooltips with some very useful and unusual effects.
How to Use the Dojo Tooltip Widget - Creating a tooltip dynamically (Page 7 of 7 )
You can declare an object variable, assign it to a dojo type tooltip, and then use that tooltip to be attached to an element as shown in the example. The <span/> element contains an animated gif image of an elephant as shown. Notice the syntax used in creating the widget by code. You specify the type of dojo widget, then within curly braces you specify the attributes, the most important of which is the id of the HTML tag to which you want to attach the tooltip. The code for this page is shown in the next paragraph. Notice that the alt attribute which is also added to the image tag runs together with the tooltip as shown in the displayed page.
<html>
<head>
<title>Create a dojo tooltip</title>
<script type="text/javascript">
var djConfig = { isDebug: true };
</script>
<script type="text/javascript"
src="http://images.devshed.com/da/stories/
http://localhost/DoAjax/dojo.js">
</script>
<script type="text/javascript">
dojo.require("dojo.widget.Button");
dojo.require("dojo.widget.Tooltip");
dojo.addOnLoad(init);
var ttip;
function init(){
ttip=dojo.widget.createWidget
("tooltip",
{connectId:"four", caption:"Elephas maximus"});
}
</script>
<body style="background-color:#efeffe;"><h3>Tooltip created by code</h3>
<span id="four">
<img alt="Elephant" src="http://images.devshed.com/da/stories/
../DojoAjax/Elephant.gif"/>
</span>
</body>
</html>
The displayed output on IE 7.0 with tooltip showing is as follows. Notice the alt showing on the same image.
Summary
One should seriously consider using Dojo for rich Internet client scripting. While the API is huge, the documentation is sparse. With more detailed documentation and clear examples of usage, dojo toolkit can play a dominant role in rich client applications and will find widespread use. This tutorial just described an extremely small item in an extremely large package. Most of the tests were verified with the three browsers IE 7.0, FireFox2.0 and Opera 9.01. All of the examples worked with the three browsers with some very minor display differences, except that the sliding show did not bring up the images in FireFox 2.0.
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JavaScript 
Rich Internet Applications with Dojo Toolkit 101
