Platinum Edition Using XHTML™, XML, and Java™ 2

Form Field Event Handlers

The W3C has also added a number of scripting event handlers to work with many of the form elements to facilitate the execution of script code while a user fills out a form. These event handlers include

• onfocus

• onblur

• onselect

• onchange

Two of the most widely usable event handlers are onfocus and onblur. Recall that a field receives focus when you've tabbed to it or clicked it to make it active. At the moment a field receives focus, you can choose to execute a script by setting the onfocus attribute of the corresponding form field element equal to the name of a script defined in the document.

When you tab out of a form field that has focus, the field is said to blur. You can execute a script when a blur event occurs by setting ...