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Viewing file:     activatables.js (6.57 KB)      -rw-r--r--

/*
Activatables -- Make sets of elements active/inactive through anchors.
Copyright (c) 2009 Andreas Blixt
MIT license

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

/*
!!! Usage notes !!!

This code stores a cache of all anchor elements (<a>), and due to this fact, the
code must not be executed before all anchor elements have been loaded into the
DOM, to avoid any unexpected behavior. Currently, there is no support for
handling anchors added to the DOM after this file has been included.

It is recommended that this file is included before the </body> tag to ensure
that all anchors are cached. Note that the code that calls the activatables()
function needs to be placed after the inclusion of this file.
*/

// Wrapped in a function so as to not pollute the global scope.
var activatables = (function () {
// The CSS classes to use for active/inactive elements.
var activeClass = 'active';
var inactiveClass = 'inactive';

var anchors = {}, activates = {};
var regex = /#([A-Za-z][A-Za-z0-9:._-]*)$/;

// Find all anchors (<a href="#something">.)
var temp = document.getElementsByTagName('a');
for (var i = 0; i < temp.length; i++) {
	var a = temp[i];

	// Make sure the anchor isn't linking to another page.
	if ((a.pathname != location.pathname &&
		'/' + a.pathname != location.pathname) ||
		a.search != location.search) continue;

	// Make sure the anchor has a hash part.
	var match = regex.exec(a.href);
	if (!match) continue;
	var id = match[1];

	// Add the anchor to a lookup table.
	if (id in anchors)
		anchors[id].push(a);
	else
		anchors[id] = [a];
}

// Adds/removes the active/inactive CSS classes depending on whether the
// element is active or not.
function setClass(elem, active) {
	var classes = elem.className.split(/\s+/);
	var cls = active ? activeClass : inactiveClass, found = false;
	for (var i = 0; i < classes.length; i++) {
		if (classes[i] == activeClass || classes[i] == inactiveClass) {
			if (!found) {
				classes[i] = cls;
				found = true;
			} else {
				delete classes[i--];
			}
		}
	}

	if (!found) classes.push(cls);
	elem.className = classes.join(' ');
}

// Functions for managing the hash.
function getParams() {
	var hash = location.hash || '#';
	var parts = hash.substring(1).split('&');

	var params = {};
	for (var i = 0; i < parts.length; i++) {
		var nv = parts[i].split('=');
		if (!nv[0]) continue;
		params[nv[0]] = nv[1] || null;
	}
	
	return params;
}

function setParams(params) {
	var parts = [];
	for (var name in params) {
		parts.push(params[name] ? name + '=' + params[name] : name);
	}

	location.hash = knownHash = '#' + parts.join('&');
}

// Looks for changes to the hash.
var knownHash = location.hash;
function pollHash() {
	var hash = location.hash;
	if (hash != knownHash) {
		var params = getParams();
		for (var name in params) {
			if (!(name in activates)) continue;
			activates[name](params[name]);
		}
		knownHash = hash;
	}
}
setInterval(pollHash, 250);

function getParam(name) {
	var params = getParams();
	return params[name];
}

function setParam(name, value) {
	var params = getParams();
	params[name] = value;
	setParams(params);
}

// If the hash is currently set to something that looks like a single id,
// automatically activate any elements with that id.
var initialId = null;
var match = regex.exec(knownHash);
if (match) {
	initialId = match[1];
	//location.hash = '#';
}

// Takes an array of either element IDs or a hash with the element ID as the key
// and an array of sub-element IDs as the value.
// When activating these sub-elements, all parent elements will also be
// activated in the process.
function makeActivatable(paramName, activatables) {
	var all = {}, first = initialId;

	// Activates all elements for a specific id (and inactivates the others.)
	function activate(id) {
		if (!(id in all)) return false;

		for (var cur in all) {
			if (cur == id) continue;
			for (var i = 0; i < all[cur].length; i++) {
				setClass(all[cur][i], false);
			}
		}

		for (var i = 0; i < all[id].length; i++) {
			setClass(all[id][i], true);
		}

		setParam(paramName, id);

		return true;
	}

	activates[paramName] = activate;

	function attach(item, basePath) {
		if (item instanceof Array) {
			for (var i = 0; i < item.length; i++) {
				attach(item[i], basePath);
			}
		} else if (typeof item == 'object') {
			for (var p in item) {
				var path = attach(p, basePath);
				attach(item[p], path);
			}
		} else if (typeof item == 'string') {
			var path = basePath ? basePath.slice(0) : [];
			var e = document.getElementById(item);
			if (!e) throw 'Could not find "' + item + '".'
			path.push(e);

			if (!first) first = item;

			// Store the elements in a lookup table.
			all[item] = path;

			// Attach a function that will activate the appropriate element
			// to all anchors.
			if (item in anchors) {
				// Create a function that will call the 'activate' function with
				// the proper parameters. It will be used as the event callback.
				var func = (function (id) {
					return function (e) {
						activate(id);

						if (!e) e = window.event;
						if (e.preventDefault) e.preventDefault();
						e.returnValue = false;
						return false;
					};
				})(item);

				for (var i = 0; i < anchors[item].length; i++) {
					var a = anchors[item][i];

					if (a.addEventListener) {
						a.addEventListener('click', func, false);
					} else if (a.attachEvent) {
						a.attachEvent('onclick', func);
					} else {
						throw 'Unsupported event model.';
					}

					all[item].push(a);
				}
			}

			return path;
		} else {
			throw 'Unexpected type.';
		}

		return basePath;
	}

	attach(activatables);

	// Activate an element.
	if (first) activate(getParam(paramName)) || activate(first);
}

return makeActivatable;
})();