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<h1>DHTML Event Handlers</h1>
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<p class="intro">HTML events can trigger actions in the browser, like starting a
JavaScript when a user clicks on an element.</p>
<h2 style="color:red" onclick="this.innerHTML='Ooops!'">Don't Click On This Text</h2>
<hr />
<h2>Examples</h2>
<p><a target="_blank" href="tryit.asp@filename=trydhtml_examples_image">onclick</a><br />Turn on the light! How
to change an image when the user clicks it.</p>
<p><a target="_blank" href="tryit.asp@filename=trydhtml_event_onmousedown">onmousedown & onmouseup</a><br />This time the light
is on only when the user holds down the mouse button.</p>
<p><a target="_blank" href="tryit.asp@filename=trydhtml_event_onload">onload</a><br />
Displays an alert box when the page has finished loading.</p>
<hr />
<h2>Event handlers</h2>
<p>An event handler allows you to execute code when an event
occurs.</p>
<p>Events are generated by the browser when the user clicks an element, when the page loads, when a form is submitted,
etc.</p>
<h3>Example</h3>
<p>A header changes when the user clicks it:</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tbody>
<tr>
<td>
<pre><h1 onclick="this.innerHTML='Ooops!'">Click on this text</h1></pre>
</td>
</tr>
</tbody>
</table>
<p><a target="_blank" href="tryit.asp@filename=trydhtml_event_onclick2">Try it yourself</a></p>
<p>You can also add a script in the head section of
the page and then call the function from the event handler:</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tbody>
<tr>
<td>
<pre><html>
<head>
<script type="text/javascript">
function changetext(id)
{
id.innerHTML="Ooops!";
}
</script>
</head>
<body>
<h1 onclick="changetext(this)">Click on this text</h1>
</body>
</html></pre>
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<h2>HTML 4.0 Event Handlers</h2>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<th width="30%" align="left">Event</th>
<th width="70%" align="left">Occurs when...</th>
</tr>
<tr>
<td>onabort</td>
<td>a user aborts page loading</td>
</tr>
<tr>
<td>onblur</td>
<td>a user leaves an object</td>
</tr>
<tr>
<td>onchange</td>
<td>a user changes the value of an object</td>
</tr>
<tr>
<td>onclick</td>
<td>a user clicks on an object</td>
</tr>
<tr>
<td>ondblclick</td>
<td>a user double-clicks on an object</td>
</tr>
<tr>
<td>onfocus</td>
<td>a user makes an object active</td>
</tr>
<tr>
<td>onkeydown</td>
<td>a keyboard key is on its way down</td>
</tr>
<tr>
<td>onkeypress</td>
<td>a keyboard key is pressed</td>
</tr>
<tr>
<td>onkeyup</td>
<td>a keyboard key is released</td>
</tr>
<tr>
<td>onload</td>
<td>a page is finished loading</td>
</tr>
<tr>
<td>onmousedown</td>
<td>a user presses a mouse-button</td>
</tr>
<tr>
<td>onmousemove</td>
<td>a cursor moves on an object</td>
</tr>
<tr>
<td>onmouseover</td>
<td>a cursor moves over an object</td>
</tr>
<tr>
<td>onmouseout</td>
<td>a cursor moves off an object</td>
</tr>
<tr>
<td>onmouseup</td>
<td>a user releases a mouse-button</td>
</tr>
<tr>
<td>onreset</td>
<td>a user resets a form</td>
</tr>
<tr>
<td>onselect</td>
<td>a user selects content on a page</td>
</tr>
<tr>
<td>onsubmit</td>
<td>a user submits a form</td>
</tr>
<tr>
<td>onunload</td>
<td>a user closes a page</td>
</tr>
</table>
<br />
<hr />
<h2>More About HTML Events</h2>
<p>For a full overview please refer to the complete
<a href="../htmldom/dom_obj_event.asp">DOM Event Object Reference</a> in our HTML
DOM tutorial.</p>
<hr />
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