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/**
* @author Evan Winslow
*
* $Id: elgglib.js 76 2010-07-17 02:08:02Z evan.b.winslow $
*/
/**
* @namespace Namespace for elgg javascript functions
*/
var elgg = elgg || {};
elgg.init = function() {
//if the user clicks a system message, make it disappear
$('.elgg_system_message').live('click', function() {
$(this).stop().fadeOut('fast');
});
};
/**
* Pointer to the global context
* {@see elgg.require} and {@see elgg.provide}
*/
elgg.global = this;
/**
* Throw an error if the required package isn't present
*
* @param {String} pkg The required package (e.g., 'elgg.package')
*/
elgg.require = function(pkg) {
var parts = pkg.split('.'),
cur = elgg.global,
part;
for (var i = 0; i < parts.length; i++) {
part = parts[i];
cur = cur[part];
if(typeof cur == 'undefined') {
throw new Error("Missing package: " + pkg);
}
}
};
/**
* Generate the skeleton for a package.
*
* <pre>
* elgg.provide('elgg.package.subpackage');
* </pre>
*
* is equivalent to
*
* <pre>
* elgg = elgg || {};
* elgg.package = elgg.package || {};
* elgg.package.subpackage = elgg.package.subpackage || {};
* </pre>
*/
elgg.provide = function(pkg) {
var parts = pkg.split('.'),
cur = elgg.global,
part;
for (var i = 0; i < parts.length; i++) {
part = parts[i];
cur[part] = cur[part] || {};
cur = cur[part];
}
};
/**
* Inherit the prototype methods from one constructor into another.
*
* @example
* <pre>
* 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!');
* </pre>
*
* @param {Function} childCtor Child class.
* @param {Function} parentCtor Parent class.
*/
elgg.inherit = function(Child, Parent) {
Child.prototype = Parent;
};
/**
* 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.extendUrl = function(url) {
url = url || '';
if(url.indexOf(elgg.config.wwwroot) == -1) {
url = elgg.config.wwwroot + url;
}
return 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 (msgs == undefined) {
return;
}
//validate delay. Must be a positive integer.
delay = parseInt(delay);
if (isNaN(delay) || delay <= 0) {
delay = 6000;
}
var messages_class = 'messages';
if (type == 'error') {
messages_class = 'messages_error';
}
//Handle non-arrays
if (msgs.constructor.toString().indexOf("Array") == -1) {
msgs = [msgs];
}
var messages_html = '<div class="' + messages_class + '">'
+ '<span class="closeMessages">'
+ '<a href="#">'
+ elgg.echo('systemmessages:dismiss')
+ '</a>'
+ '</span>'
+ '<p>' + msgs.join('</p><p>') + '</p>'
+ '</div>';
$(messages_html).appendTo('#elgg_system_messages').show().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.extendUrl(url);
};
/**
* Initialise Elgg
* @todo How should plugins, etc. initialize themselves?
*/
$(function() {
elgg.init();
});
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