Use YAHOO.env.ua to identify the user's browser and to branch JavaScript logic based on what browser is being used.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>User Agent Detection</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/dragdrop/dragdrop-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
#dd1,#dd2 {
position: relative;
margin: 1em 1em 0;
width: 175px;
float: left;
cursor: move;
}
#demo p {
position: relative;
padding: 1em;
height: 100%;
margin: 0;
font-weight: bold;
text-align: center;
z-index: 20;
}
#dd1 p {
border: 10px solid #ccc;
background-color: #eee;
}
#dd2 p {
border: 10px solid #e76300;
background-color: #fff5df;
}
#demo .shim {
position: absolute;
top: 0;
left: 0;
width: 100%;
margin: 0;
padding: 0;
border: 0;
z-index: 10;
}
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>User Agent Detection</h1>
<div class="exampleIntro">
<p>This example demonstrates the use of <code>YAHOO.env.ua</code> to identify the user's browser and to branch JavaScript logic based on what browser is being used. (<strong>Note:</strong> We strongly recommend using feature detection rather than user-agent sniffing to fork code; only use this technique where it is absolutely necessary to do so — for example, in cases where browsers do not report their own capabilities accurately.)</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<div id="demo">
<select name="foo">
<option value="NONE" selected="selected">This is a very long select element for the example</option>
<option value="1">Apple</option>
<option value="2">Rutabaga</option>
<option value="3">Motor oil</option>
</select>
<hr>
<div id="dd1">
<p>
NO IFRAME<br>
Drag over the select
</p>
</div>
<div id="dd2">
<p>
IFRAME<br>
Drag over the select
</p>
</div>
</div>
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
var dd1 = new YAHOO.util.DD('dd1');
var dd2 = new YAHOO.util.DD('dd2');
dd1.startDrag = function (x,y) {
YAHOO.log("Drag started for element with no protection from the display bug", "info", "example");
}
if (YAHOO.env.ua.ie > 5 && YAHOO.env.ua.ie < 7) {
// Create an iframe shim
var shim = document.createElement('iframe');
shim.src = 'about:blank';
shim.className = 'shim';
// Add the shim to the dragging element on the first startDrag
dd2.startDrag = function (x,y) {
var d = this.getEl();
if (d.firstChild !== shim) {
YAHOO.util.Dom.setStyle(shim, 'height',d.offsetHeight);
d.insertBefore(shim, d.firstChild);
YAHOO.log("Your browser is IE " + YAHOO.env.ua.ie + ". Shim added.", "info","example");
} else {
YAHOO.log("Your browser is IE " + YAHOO.env.ua.ie + ", but the shim was already added", "info","example");
}
}
} else { // Not shim worthy
dd2.startDrag = function (x,y) {
YAHOO.log("Your browser is NOT IE. No shim added.", "info", "example");
}
}
});
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
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