/** * @namespace Singleton object for holding the Elgg javascript library */ var elgg = elgg || {}; /** * Pointer to the global context * * @see elgg.require * @see elgg.provide */ elgg.global = this; /** * Convenience reference to an empty function. * * Save memory by not generating multiple empty functions. */ elgg.nullFunction = function() {}; /** * * @example * AbstractClass.prototype.toBeImplemented = elgg.abstractMethod; * * Now this forces an inheriting class to implement the method or * it will throw an error. */ elgg.abstractMethod = function() { throw new Error("Oops... you forgot to implement an abstract method!"); }; /** * Check if the value is an array. * * No sense in reinventing the wheel! * * @return boolean */ elgg.isArray = jQuery.isArray; /** * Check if the value is a function. * * No sense in reinventing the wheel! * * @return boolean */ elgg.isFunction = jQuery.isFunction; /** * Check if the value is a "plain" object (i.e., created by {} or new Object()) * * No sense in reinventing the wheel! * * @return boolean */ elgg.isPlainObject = jQuery.isPlainObject; /** * Check if the value is a string * * @param {*} val * * @return boolean */ elgg.isString = function(val) { return typeof val === 'string'; }; /** * Check if the value is an object * * @note This returns true for functions and arrays! If you want to return true only * for "plain" objects (created using {} or new Object()) use elgg.isPlainObject. * * @param {*} val * * @return boolean */ elgg.isObject = function(val) { return typeof val === 'object'; }; /** * Check if the value is undefined * * @param {*} val * * @return boolean */ elgg.isUndefined = function(val) { return val === undefined; }; /** * Check if the value is null * * @param {*} val * * @return boolean */ elgg.isNull = function(val) { return val === null; }; /** * Check if the value is either null or undefined * * @param {*} val * * @return boolean */ elgg.isNullOrUndefined = function(val) { return val == null; }; /** * Throw an exception of the type doesn't match * * @todo Might be more appropriate for debug mode only? */ elgg.assertTypeOf = function(type, val) { if (typeof val !== type) { throw new TypeError("Expecting param of " + arguments.caller + "to be a(n) " + type + "." + " Was actually a(n) " + typeof val + "."); } }; /** * Throw an error if the required package isn't present * * @param {String} pkg The required package (e.g., 'elgg.package') */ elgg.require = function(pkg) { elgg.assertTypeOf('string', pkg); var parts = pkg.split('.'), cur = elgg.global, part, i; for (i = 0; i < parts.length; i += 1) { part = parts[i]; cur = cur[part]; if (elgg.isUndefined(cur)) { throw new Error("Missing package: " + pkg); } } }; /** * Generate the skeleton for a package. * *
 * elgg.provide('elgg.package.subpackage');
 * 
* * is equivalent to * *
 * elgg = elgg || {};
 * elgg.package = elgg.package || {};
 * elgg.package.subpackage = elgg.package.subpackage || {};
 * 
* * @example elgg.provide('elgg.config.translations') * * @param {string} pkg The package name. */ elgg.provide = function(pkg, opt_context) { elgg.assertTypeOf('string', pkg); var parts = pkg.split('.'), context = opt_context || elgg.global, part, i; for (i = 0; i < parts.length; i += 1) { part = parts[i]; context[part] = context[part] || {}; context = context[part]; } }; /** * Inherit the prototype methods from one constructor into another. * * @example *
 * function ParentClass(a, b) { }
 * 
 * ParentClass.prototype.foo = function(a) { alert(a); }
 *
 * function ChildClass(a, b, c) {
 *     //equivalent of parent::__construct(a, b); in PHP
 *     ParentClass.call(this, a, b);
 * }
 *
 * elgg.inherit(ChildClass, ParentClass);
 *
 * var child = new ChildClass('a', 'b', 'see');
 * child.foo('boo!'); // alert('boo!');
 * 
* * @param {Function} childCtor Child class. * @param {Function} parentCtor Parent class. */ elgg.inherit = function(Child, Parent) { Child.prototype = new Parent(); Child.prototype.constructor = Child; }; /** * Prepend elgg.config.wwwroot to a url if the url doesn't already have it. * * @param {String} url The url to extend * @return {String} The extended url * @private */ elgg.normalize_url = function(url) { url = url || ''; elgg.assertTypeOf('string', url); // jslint complains if you use /regexp/ shorthand here... ?!?! if ((new RegExp("^(https?:)?//")).test(url)) { return url; } return elgg.config.wwwroot + url; }; /** * Displays system messages via javascript rather than php. * * @param {String} msgs The message we want to display * @param {Number} delay The amount of time to display the message in milliseconds. Defaults to 6 seconds. * @param {String} type The type of message (typically 'error' or 'message') * @private */ elgg.system_messages = function(msgs, delay, type) { if (elgg.isUndefined(msgs)) { return; } var classes = [], messages_html = [], i; //validate delay. Must be a positive integer. delay = parseInt(delay, 10); if (isNaN(delay) || delay <= 0) { delay = 6000; } classes = ['elgg_system_message', 'radius8']; if (type === 'error') { classes.push('messages_error'); } //Handle non-arrays if (!elgg.isArray(msgs)) { msgs = [msgs]; } for (i in msgs) { messages_html.push('

' + msgs[i] + '

'); } $(messages_html.join('')).appendTo('#elgg_system_messages') .animate({opacity: '1.0'}, delay).fadeOut('slow'); }; /** * Wrapper function for system_messages. Specifies "messages" as the type of message * @param {String} msg The message to display * @param {Number} delay How long to display the message (milliseconds) */ elgg.system_message = function(msgs, delay) { elgg.system_messages(msgs, delay, "message"); }; /** * Wrapper function for system_messages. Specifies "errors" as the type of message * @param {String} error The error message to display * @param {Number} delay How long to dispaly the error message (milliseconds) */ elgg.register_error = function(errors, delay) { elgg.system_messages(errors, delay, "error"); }; /** * Meant to mimic the php forward() function by simply redirecting the * user to another page. * * @param {String} url The url to forward to */ elgg.forward = function(url) { location.href = elgg.normalize_url(url); };