Using StyleSheet to create a page theme
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* Douglas Crockford's JSON parsing and stringifying methods: In the JSON Utility, Douglas Crockford's JSON parsing and stringifying methods are adapted from work published at JSON.org. The adapted work is in the public domain.
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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>Using StyleSheet to create a page theme</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/slider/assets/skins/sam/slider.css" />
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/colorpicker/assets/skins/sam/colorpicker.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>
<script type="text/javascript" src="yui_2.7.0b-lib/slider/slider-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/element/element-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/colorpicker/colorpicker-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/stylesheet/stylesheet-min.js"></script>
<!--there is no custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Using StyleSheet to create a page theme</h1>
<div class="exampleIntro">
<p>In this example, we'll change some colors in this page's color theme. Enter any valid CSS color value into the inputs and submit the cahnges to see them applied to the page.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<div id="demo">
<form id="demo_form" action="#" method="get">
<fieldset>
<p>Example values: #123456 or #123 or rgb(0,10,30) or red</p>
<label for="demo_headings">Headings and labels</label>
<input type="text" size="7" id="demo_headings" value="#e76300">
<pre><code>h1,h2,h3,h4,h5,h6,
#demo label {
color: <em id="demo_heading_value">#e76300</em>;
}</code></pre>
<label for="demo_bg">Demo background</label>
<input type="text" size="7" id="demo_bg" value="#89d">
<pre><code>.example .promo {
background-color: <em id="demo_background_value">#89d</em>;
}</code></pre>
<label for="demo_highlight">Left nav highlight</label>
<input type="text" size="7" id="demo_highlight" value="#f82">
<pre><code>#toc ul li.active,
#toc ul li a:hover {
background-color: <em id="demo_highlight_value">#f82</em>;
}</code></pre>
</fieldset>
<p>
<input type="submit" id="update" value="Update theme">
</p>
</form>
</div>
<script type="text/javascript">
(function () {
// Some shortcuts
var Dom = YAHOO.util.Dom,
trim = YAHOO.lang.trim,
Demo;
Demo = YAHOO.namespace('demo').PageTheme = {
theme : null,
headings : null,
background : null,
highlight : null,
isValidColor : function (v) {
return /^#[0-9a-f]{3}(?:[0-9a-f]{3})?$/i.test(v) ||
/^rgb\(\s*\d+\s*,\s*\d+\s*,\s*\d+\s*\)$/.test(v) ||
/^[a-z]+$/i.test(v);
},
init : function () {
// Create a new StyleSheet instance for us to override some current
// page styles. For illustration, seed it with the CSS to style the
// demo form
Demo.theme = YAHOO.util.StyleSheet("\
#demo form,\
#demo fieldset {\
border: none; padding: 0; margin: 0;\
}\
#demo fieldset p {\
background: #fff;\
border: 1px solid #ccc;\
padding: 1em 1ex;\
}\
#demo pre code {\
background: #fff;\
border: 1px solid #ccc;\
color: #555;\
display: block;\
font-weight: normal;\
margin: 1ex 0 1em;\
padding: 1ex;\
}\
#demo label {\
font-weight: bold;\
color: #e76300;\
}\
#demo pre code em {\
color: #000;\
font-weight: bold;\
}\
");
// Store the input fields for value retrieval
Demo.headings = Dom.get('demo_headings');
Demo.background = Dom.get('demo_bg');
Demo.highlight = Dom.get('demo_highlight');
// Set up the submit handler to update the page styles
YAHOO.util.Event.on('demo_form','submit', function (e) {
YAHOO.util.Event.stopEvent(e);
Demo.update();
});
},
update : function () {
var v = trim(Demo.headings.value);
if (Demo.isValidColor(v)) {
// multiple selectors are delimited by commas
Demo.theme.set('h1,h2,h3,h4,h5,h6, #demo label', { color : v });
Dom.get('demo_heading_value').innerHTML = v;
}
v = trim(Demo.background.value);
if (Demo.isValidColor(v)) {
// use camelCase for style property names
Demo.theme.set('.example .promo', { backgroundColor : v });
Dom.get('demo_background_value').innerHTML = v;
}
v = trim(Demo.highlight.value);
if (Demo.isValidColor(v)) {
Demo.theme.set(
'#toc ul li.selected,'+
'#toc ul li a:hover', { backgroundColor : v });
Dom.get('demo_highlight_value').innerHTML = v;
}
}
};
// Initialize the interface when the DOM is ready
YAHOO.util.Event.onDOMReady(Demo.init);
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
<!-- presentbright.corp.yahoo.com uncompressed/chunked Thu Feb 19 10:53:19 PST 2009 -->
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