C.11 Event-Handler Attributes

title

This attribute represents textual information de scribing the ele ment it belon gs to, typ-

ically in the fo rm of a tooltip.

One way that HTML elements c an get notiﬁed of events (e.g., mouse clicks or key

presses) is to specify an event handler using the corresponding HTML attribute on

an element that needs to respond to the event. Event-handler attribute names b egin

with on and are the same as the nam es of the event-handler properties deﬁned by the

JavaScript Element object. You can ﬁnd some of them in the table on page 402.

Using HTM L event-handler attributes to specify event handlers is not in line with go od

practice. Nam ely, it requires mixing structure (HTML) and behavior (JavaScript). A

much better approach is using the analogous properties of the Element JavaScript

object, or even the addEventListener() method of the EventTarget object. The

latter is not covered in this book , though.

Example

<!-- A click on the following <p> element will trigger the

JavaScript alert() method. -->

<p onclick="alert(’Don’t you ever listen?’)">Don’t click me!</p>

338 HTML Reference

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