I was roaming at digg when i stumble upon this page:CSS+Javascript power. Fancy menu. Inside, i was amazed to see the way the snippets presented. In an expandable box. You can even see the box expanding line by line.

If you see my post yesterday, I tried my best to reproduce the same effect. But I failed.

To successfully create the expandable box, modify the following files of your active WordPress template/theme by adding the snippet:
style.css

.codediv
{
	height:21px; width:470px;
	overflow:hidden;
	border: #333333 thin solid;
	font-size: 11px;
	display: block;
	background-color: #fff;
}
.codeclicker
{
	cursor:pointer;
}

header.php

<script language="javascript" type="text/javascript" src="<?php bloginfo('wpurl') ?>/js/behavior.js" ></script>
<script language="javascript" type="text/javascript" src="<?php bloginfo('wpurl') ?>/js/selector.js" ></script>
<script language="javascript" type="text/javascript">
var myrules = {
	'.codeclicker' : {
		onclick : function() {
			//alert(this.parentNode.tagName);
			var o = this.parentNode;
			if (o.style.overflow == 'hidden') {
				o.style.height = '100%';
				o.style.overflow = 'scroll';
			}
			else {
				o.style.height = '21px';
				o.style.overflow = 'hidden';
			}
		}
	}
};
Behavior.register(myrules);
</script>

Create a folder called “js” on your WordPress installation folder and create the following files on that folder:

selector.js

/* document.getElementsBySelector(selector)
- returns an array of element objects from the current document
matching the CSS selector. Selectors can contain element names,
class names and ids and can be nested. For example:elements = document.getElementsBySelect('div#main p a.external')
Will return an array of all 'a' elements with 'external' in their
class attribute that are contained inside 'p' elements that are
contained inside the 'div' element which has id="main"
New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
See http://www.w3.org/TR/css3-selectors/#attribute-selectors
Version 0.4 - Simon Willison, March 25th 2003
-- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-- Opera 7 fails
*/

function getAllChildren(e) {
	// Returns all children of element. Workaround required for IE5/Windows. Ugh.
	return e.all ? e.all : e.getElementsByTagName('*');
}

document.getElementsBySelector = function(selector) {
	// Attempt to fail gracefully in lesser browsers
	if (!document.getElementsByTagName) {
		return new Array();
	}
	
	// Split selector in to tokens
	var tokens = selector.split(' ');
	var currentContext = new Array(document);
	for (var i = 0; i < tokens.length; i++) {
		token = tokens[i].replace(/^s+/,'').replace(/s+$/,'');
		if (token.indexOf('#') > -1) {
			// Token is an ID selector
			var bits = token.split('#');
			var tagName = bits[0];
			var id = bits[1];
			var element = document.getElementById(id);
			if (tagName && element.nodeName.toLowerCase() != tagName) {
				// tag with that ID not found, return false
				return new Array();
			}
			
			// Set currentContext to contain just this element
			currentContext = new Array(element);
			continue; // Skip to next token
		}
		if (token.indexOf('.') > -1) {
			// Token contains a class selector
			var bits = token.split('.');
			var tagName = bits[0];
			var className = bits[1];
			if (!tagName) {
				tagName = '*';
			}
			
			// Get elements matching tag, filter them for class selector
			var found = new Array;
			var foundCount = 0;
			for (var h = 0; h < currentContext.length; h++) {
				var elements;
				if (tagName == '*') {
					elements = getAllChildren(currentContext[h]);
				} else {
					elements = currentContext[h].getElementsByTagName(tagName);
				}
				
				for (var j = 0; j < elements.length; j++) {
					found[foundCount++] = elements[j];
				}
			}
			currentContext = new Array();
			var currentContextIndex = 0;
			
			for (var k = 0; k < found.length; k++) {
				if (found[k].className && found[k].className.match(new RegExp('b'+className+'b'))) {
					currentContext[currentContextIndex++] = found[k];
				}
			}
			continue; // Skip to next token
		}
		// Code to deal with attribute selectors
		if (token.match(/^(w*)[(w+)([=~|^$*]?)=?"?([^]"]*)"?]$/)) {
			var tagName = RegExp.$1;
			var attrName = RegExp.$2;
			var attrOperator = RegExp.$3;
			var attrValue = RegExp.$4;
			if (!tagName) {
				tagName = '*';
			}
			// Grab all of the tagName elements within current context
			var found = new Array;
			var foundCount = 0;
			for (var h = 0; h < currentContext.length; h++) {
				var elements;
				if (tagName == '*') {
					elements = getAllChildren(currentContext[h]);
				} else {
					elements = currentContext[h].getElementsByTagName(tagName);
				}
				for (var j = 0; j < elements.length; j++) {
					found[foundCount++] = elements[j];
				}
			}
			currentContext = new Array();
			var currentContextIndex = 0;
			var checkFunction; // This function will be used to filter the elements
			switch (attrOperator) {
				case '=': // Equality
					checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
					break;
				case '~': // Match one of space seperated words
					checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('b'+attrValue+'b'))); };
					break;
				case '|': // Match start with value followed by optional hyphen
					checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
					break;
				case '^': // Match starts with value
					checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
					break;
				case '$': // Match ends with value - fails with "Warning" in Opera 7
					checkFunction = function(e) {
						return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); 
					};
					break;
				case '*': // Match ends with value
					checkFunction = function(e) { 
						return (e.getAttribute(attrName).indexOf(attrValue) > -1); 
					};
					break;
				default :
					// Just test for existence of attribute
					checkFunction = function(e) { return e.getAttribute(attrName); };
			}
			currentContext = new Array();
			var currentContextIndex = 0;
			for (var k = 0; k < found.length; k++) {
				if (checkFunction(found[k])) {
					currentContext[currentContextIndex++] = found[k];
				}
			}
			// alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
			continue; // Skip to next token
		}
		
		// If we get here, token is JUST an element (not a class or ID selector)
		tagName = token;
		var found = new Array();
		var foundCount = 0;
		for (var h = 0; h < currentContext.length; h++) {
			var elements = currentContext[h].getElementsByTagName(tagName);
			for (var j = 0; j < elements.length; j++) {
				found[foundCount++] = elements[j];
			}
		}
		
		currentContext = found;
	}
	return currentContext;	
}

/* That revolting regular expression explained
/^(w+)[(w+)([=~|^$*]?)=?"?([^]"]*)"?]$/
---/  ---/-------------/    -------/
|      |         |               |
|      |         |           The value
|      |    ~,|,^,$,* or =
|   Attribute
Tag
*/

behavior.js

// behavior.js - by Dave Herman
// Copyright (C) 2005 by Dave Herman
//
// Based on behaviour.js by Ben Nolan, June 2005
// and getElementBySelector.js by Simon Willison, 2004.
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// =============================================================================
// Class: HandlerSet
// =============================================================================

function HandlerSet() {
	this.clearHandlers();
}

HandlerSet.prototype = {
	addHandler : function(f, key) {
		key = key || this.uniqueID++;
		this.installedHandlers[key] = f;
		return key;
	},
	removeHandler : function(key) {
		delete this.installedHandlers[key];
	},
	clearHandlers : function() {
		this.installedHandlers = { };
		this.uniqueID = 0;
	},
	replaceHandlers : function(f, key) {
		clearHandlers();
		return addHandler(f, key);
	},
	applyAll : function(object, arguments) {
		for (var handler in this.installedHandlers) {
			this.installedHandlers[handler].apply(object, arguments);
		}
	},
	debug : function() {
		var str = "";
		for (var p in this.installedHandlers) {
			str += p + " => " + this.installedHandlers[p] + "n";
		}
		alert(str);
	}
};

// =============================================================================
// Function Class: EventHandler
// =============================================================================
function isEventHandler(x) {
	return (typeof x == 'function' && 
		x.handlers &&
		x.handlers.constructor == HandlerSet);
}

function makeEventHandler(original) {
	var handlers = new HandlerSet();
	if (typeof original == 'function') {
		handlers.addHandler(original);
	}
	
	// The event handler is a function, so it can be used with the DOM.
	// But when it's called, we apply all the handlers in the set.
	var result = function() {
		handlers.applyAll(this, arguments);
	};
	
	// We also expose its handler set so we can get at it later.
	result.handlers = handlers;
	return result;
}

// =============================================================================
// Module: Behavior
// =============================================================================
var Behavior = {
	registry : new Array,
	register : function(sheet) {
		Behavior.registry.push(sheet);
	},
	registerEventHandlers : function(element, handlers) {
		for (var event in handlers) {
			if (!isEventHandler(element[event])) {
				element[event] = makeEventHandler(element[event]);
			}
			element[event].handlers.addHandler(handlers[event]);
		}
	},
	apply : function() {
		for (var i = 0; i < Behavior.registry.length; i++) {
			var sheet = Behavior.registry[i];
			for (var selector in sheet) {
				var list = document.getElementsBySelector(selector);
				if (!list) {
					continue;
				}
				for (var j = 0; j < list.length; j++) {
					Behavior.registerEventHandlers(list[j], sheet[selector]);
				}
			}
		}
	},
	addLoadHandler : function(handler) {
		var oldHandler = window.onload;
		if (typeof oldHandler != 'function') {
			window.onload = handler;
		}
		else {
			window.onload = function() {
				oldHandler();
				handler();
			};
		}
	}
};

Behavior.addLoadHandler(function() { Behavior.apply(); });

To use create the snippets use the following structure:

<pre class="codediv"><img src="/images/codeclicker.gif?x74012" class="codeclicker" border="0" />
<!-- put your snippet content here -->
</pre>

Don’t forget to create the “codeclicker.gif” that will be put on folder “images” in your WordPress installation folder (use bloginfo(‘wpurl’); ) the image height should be 20px (if more the image will be hidden since its overflow the “pre” tag)

Note: I tried to add changing the background color using CSS “background-color = “#bbbbbb”;” on the onclick event handler, but somehow it prevents the script running. Any idea? I also have yet to be able to slowly scroll the snippet box. Again, any idea??
Thank you for reading. Critics and comments are welcome 🙂

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