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/*
* jquery.subscribe.1.2.3
*
* Implementation of publish/subcription framework for jQuery
* Requires use of jQuery. Tested with jQuery 1.4 and above
*
*
* Copyright (c) 2008 Eric Chijioke (obinna a-t g mail dot c o m)
* Copyright (c) 2012 Johannes Geppert http://www.jgeppert.com
*
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Release Notes:
*
* version 1.1:
*
* Fixed unexpected behavior which can occur when a script in a embedded page (page loaded in div,tab etc.) subscribes a handler for a topic using
* the jQuery subscribe ($.subscribe) or a no-id element but this subscribe plugin is not reloaded within that embedded page (for example, when
* script is included in containing page) . In this case, if the embedded page is reloaded without reloading the entire page (and plugin), the
* subscription could be made multiple times for the topic, which will call the handler multiple times each time the topic is published.
* Code has been added to prevent this when the subscription is made using the non-element subscribe ($.subscribe()), which assures that only one
* subscription is made for a topic for a given window/frame. To prevent this from happening for an element subscription ($elem.subscribe()), make
* sure that the element has an id attribute.
*
* version 1.2
* Added the isSubscribed() method
*
* version 1.2.1
* Fixed to work with jQuery 1.4 changes
* - changed $() syntax to $(document)
*
* version 1.2.2
* Added subscribe overwrite property (default = false) to handle 1.4.2 changes and
* allow for multiple subscriptions by the same element to the same topic
* - changed $() syntax to $(document)
*
* version 1.2.3
* jslint fixes
*
* Added protection to variables when file is loaded multiple times
*/
/*global jQuery, window, document */
( function($) {
var _subscribe_topics, _subscribe_handlers, _subscribe_getDocumentWindow, i;
if(!window._subscribe_topics) {
_subscribe_topics = {};
_subscribe_handlers = {};
}
_subscribe_getDocumentWindow = function(document){
return document.parentWindow || document.defaultView;
};
$.fn.extend({
/**
* Creates a new topic without any subscribers.
* Not usually used explicitly
*/
createTopic : function(topic) {
if(topic && !_subscribe_topics[topic]) {
_subscribe_topics[topic] = {};
_subscribe_topics[topic].objects = {};
_subscribe_topics[topic].objects.__noId__ = [];
}
return this;
},
/**
* Destroy an existing topic and unsubscribe all subscribers
*/
destroyTopic : function(topic) {
if(topic && _subscribe_topics[topic]) {
$.each( _subscribe_topics[topic].objects, function(i, object){
if($.isArray(object)) { // handle '__noId__' elements
$.each( object, function(j, obj){
//typeof(object) check in case someone has added methods to Array.protoype
if(!$.isFunction(obj)) {
obj.unbind(topic);
}
});
} else {
object.unbind(topic);
}
});
}
delete _subscribe_topics[topic];
return this;
},
/**
* Subscribes an object to particular topic with a handler.
* When the topic is published, this handler will be executed.
*
* Parameters:
* -topic- is the string name of the topic
* -handler- is a handler function and is of the form function(event, data), in which the 'this' refers to the element itself.
* handler can be a function or can be a string referring to a function previously registered using the $.subscribeHandler() function
* Note: returning 'false' from the handler will prevent subsequent handlers from being executed on this element during
* this call.
* -data- (optional) is additional data that is passed to the event handler as event.data when the topic is published
*
* Note: Unexpected behavior can occur when a script in a embedded page (page loaded in div,tab etc.) subscribes a handler for a topic using
* the global jQuery subscribe ($.subscribe) or a no-id element but this subscribe plugin .js is not reloaded within that embedded page (for example, when
* script is included in container page) . In this case, if the embedded page is reloaded without reloading the container page (and plugin), the
* subscription could be made multiple times for the topic, which will call the handler multiple times each time the topic is published.
* Code has been added to prevent this when the subscription is made using the non-element subscribe ($.subscribe()), which assures that only one
* subscription is made for a topic for a given window/frame. To prevent this from happening for an element subscription ($elem.subscribe()), make
* sure that the element has an id attribute.
*/
subscribe : function(topic, handler, data, multiple) {
if(this[0] && topic && handler) {
this.createTopic(topic);
if(this.attr('id')) {
_subscribe_topics[topic].objects[this.attr('id')] = this;
} else {
//do not subscribe the same window/frame document multiple times, this causes unexpected behavior of executing embedded scripts multiple times
var noIdObjects = _subscribe_topics[topic].objects.__noId__;
if(this[0].nodeType === 9) { //if document is being bound (the case for non-element jQuery subscribing ($.subscribe)
jQuery.each(noIdObjects, function(j, noIdObject) {
//typeof(noIdObject) check in case someone has added methods to Array.protoype
if(!$.isFunction(noIdObject) && noIdObject[0].nodeType === 9 && _subscribe_getDocumentWindow(this[0]).frameElement === _subscribe_getDocumentWindow(noIdObject[0]).frameElement ) {
return this;
}
});
}
var exists = false;
for(i = 0; i < noIdObjects.length; i++) {
if(noIdObjects[i] === this){
exists = true;
break;
}
}
if(!exists) {
_subscribe_topics[topic].objects.__noId__.push(this);
}
}
if(true === multiple) { //allow multiple topic handlers to be bound to topic for same object
if($.isFunction(handler)) {
this.bind(topic, data, handler);
} else if(typeof(handler) === 'string' && $.isFunction(_subscribe_handlers[handler])) {
this.bind(topic, data, _subscribe_handlers[handler]);
}
} else {
var events = this.data('events');
if(events) {
var eventsTopic = events[topic];
if(eventsTopic && eventsTopic.length > 0) { //already bound to this topic
//replace with new one
this.unbind(topic);
}
}
if($.isFunction(handler)) {
this.bind(topic, data, handler);
} else if(typeof(handler) === 'string' && $.isFunction(_subscribe_handlers[handler])) {
this.bind(topic, data, _subscribe_handlers[handler]);
}
}
}
return this;
},
/**
* Remove a subscription of an element to a topic.
* This will unbind stop all handlers from executing on this element when the topic
* is published
*/
unsubscribe : function(topic) {
if(topic) {
if(_subscribe_topics[topic]) {
if(this.attr('id')) {
var object = _subscribe_topics[topic].objects[this.attr('id')];
if(object) {
delete _subscribe_topics[topic].objects[this.attr('id')];
}
} else {
var noIdObjects = _subscribe_topics[topic].objects.__noId__;
for(i = 0; i < noIdObjects.length; i++){
//typeof(noIdObject) check in case someone has added methods to Array.protoype
if(!$.isFunction(noIdObjects[i]) && noIdObjects[i] === this){
_subscribe_topics[topic].objects.__noId__.splice(i,1);
break;
}
}
}
}
this.unbind(topic);
}
return this;
},
/**
* Determine if an element has already subscribed to a topics
* returns true if so, otherwise false
*/
isSubscribed : function(topic) {
if(topic) {
if(_subscribe_topics[topic]) {
if(this.attr('id')) {
var object = _subscribe_topics[topic].objects[this.attr('id')];
if(object) {
return true;
}
} else {
var noIdObjects = _subscribe_topics[topic].objects.__noId__;
for(i = 0; i < noIdObjects.length; i++){
//typeof(noIdObject) check in case someone has added methods to Array.protoype
if(!$.isFunction(noIdObjects[i]) && noIdObjects[i] === this){
return true;
}
}
}
}
}
return false;
},
/**
* Publishes a topic (triggers handlers on all topic subscribers)
* This ends up calling any subscribed handlers which are functions of the form function (event, data)
* where: event - is a standard jQuery event object
* data - is the data parameter that was passed to this publish() method
* event.data - is the data parameter passed to the subscribe() function when this published topic was subscribed to
* event.target - is the dom element that subscribed to the event (or the document element if $.subscribe() was used)
*
* Parameters:
* -topic- is the string name of the topic
* -data- (optional) is additional data that is passed to the event handler 'data' parameter when the topic is published
* handler can be a function or can be a string referring to a function previously registered using the $.subscribeHandler() function
* -originalEvent- (optional) may be passed in a reference to an event which triggered this publishing. This will be passed as the
* 'originalEvent' field of the triggered event which will allow for controlling the propagation of higher level events
* from within the topic handler. In other words, this allows one to cancel execution of all subsequent handlers on the originalEvent
* for this element by return 'false' from a handler that is subscribed to the topic published here. This can be especially useful
* in conjunction with publishOnEvent(), where a topic is published when an event executes (such as a click) and we want our
* handler logic prevent additional topics from being published (For example if our topic displays a 'delete confirm' dialog on click and
* the user cancels, we may want to prevent subsequent topics bound to the original click event from being published).
*/
publish : function(topic, data, originalEvent) {
if(topic) {
this.createTopic(topic);
//if an orginal event exists, need to modify the event object to prevent execution of all
//other handlers if the result of the handler is false (which calls stopPropagation())
var subscriberStopPropagation = function(){
this.isImmediatePropagationStopped = function(){
return true;
};
this.isPropagationStopped = function(){
return true;
};
//(new $.Event).stopPropagation();
if(this.originalEvent) {
this.originalEvent.isImmediatePropagationStopped = function(){
return true;
};
this.originalEvent.stopPropagation = subscriberStopPropagation;
}
};
var event = jQuery.Event(topic);
$.extend(event,{originalEvent: originalEvent, stopPropagation: subscriberStopPropagation});
jQuery.each(_subscribe_topics[topic].objects, function(i, object) {
if($.isArray(object)) { // handle '__noId__' elements (if any)
if(object.length > 0) {
jQuery.each(object, function(j, obj) {
//typeof(object) check in case someone has added methods to Array.protoype
if(!$.isFunction(obj)) {
obj.trigger( event,data);
}
});
}
} else {
object.trigger( event,data);
}
});
}
return this;
},
/**
* Binds an objects event handler to a publish call
*
* Upon the event triggering, this ends up calling any subscribed handlers which are functions of the form function (event, data)
* where: event- is a standard jQuery event object
* event.data- is the data parameter passed to the subscribe() function when this published topic was subscribed to
* data- is the data parameter that was passed to this publishOnEvent() method
* Parameters:
* -event- is the string name of the event upon which to publish the topic
* -topic- is the string name of the topic to publish when the event occurs
* -data- (optional) is additional data which will be passed in to the publish() method ant hen available as the second ('data')
* parameter to the topic handler
*/
publishOnEvent : function(event, topic, data) {
if(event && topic) {
this.createTopic(topic);
this.bind(event, data, function (e) {
$(this).publish(topic, e.data, e);
});
}
return this;
}
});
/**
* Make publish(), createTopic() and destroyTopic() callable without an element context
* Often don't need a context to subscribe, publish, create or destroy a topic.
* We will call from the document context
*/
$.extend({
/**
* Subscribe an event handler to a topic without an element context
*
* Note: Caution about subscribing using same document to topic multiple time (maybe by loading subscribe script multiple times)
*
*/
subscribe : function(topic, handler, data) {
return $(document).subscribe(topic, handler, data);
},
/**
* Unsubscribe an event handler for a topic without an element context
*
*/
unsubscribe : function(topic, handler, data) {
return $(document).unsubscribe(topic, handler, data);
},
/**
* Register a handler function which can then be referenced by name when calling subscribe()
*/
subscribeHandler: function(name, handler) {
if(name && handler && $.isFunction(handler)) {
_subscribe_handlers[name] = handler;
}
return $(document);
},
publish: function(topic, data) {
return $(document).publish(topic,data);
},
createTopic: function(topic) {
return $(document).createTopic(topic);
},
destroyTopic: function(topic) {
return $(document).destroyTopic(topic);
}
});
})(jQuery);
