Created
January 5, 2011 17:42
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Experimenting with JavaScript's custom event model
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function EventDispatcher() { | |
this._listeners = {}; | |
} | |
EventDispatcher.prototype = { | |
constructor: EventDispatcher, | |
addEventListener: function (type, listener) { | |
if ( typeof this._listeners[type] == "undefined" ) { | |
this._listeners[type] = []; | |
} | |
this._listeners[type].push(listener); | |
}, | |
dispatchEvent: function(event) { | |
if (typeof event == "string"){ | |
event = { type: event }; | |
} | |
if (!event.target){ | |
event.target = this; | |
} | |
if (!event.type){ | |
throw new Error("Event object missing 'type' property."); | |
} | |
if (this._listeners[event.type] instanceof Array){ | |
var listeners = this._listeners[event.type]; | |
for (var i=0, len=listeners.length; i < len; i++){ | |
listeners[i].call(this, event); | |
} | |
} | |
} | |
}; | |
Projects.prototype = new EventDispatcher(); | |
Projects.prototype.constructor = Projects; | |
function Projects() { | |
EventDispatcher.call(this); | |
this._list = []; | |
}; | |
Projects.prototype.load = function() { | |
var that = this; | |
function build_list(data, parent) { | |
var value = eval(data); | |
for ( index in value ) { | |
var project = new Object(); | |
project.name = value[index].fields.name; | |
project.archived = value[index].fields.archived; | |
project.visible = value[index].fields.visible; | |
project.file_path_0 = value[index].fields.file_path_0; | |
project.file_path_1 = value[index].fields.file_path_1; | |
project.file_path_2 = value[index].fields.file_path_2; | |
project.file_path_3 = value[index].fields.file_path_3; | |
project.file_path_4 = value[index].fields.file_path_4; | |
project.file_path_5 = value[index].fields.file_path_5; | |
project.file_path_6 = value[index].fields.file_path_6; | |
project.file_path_7 = value[index].fields.file_path_7; | |
project.file_path_8 = value[index].fields.file_path_8; | |
project.file_path_9 = value[index].fields.file_path_9; | |
parent._list.push(project); | |
} // end for | |
parent.dispatchEvent("data_loaded"); | |
}; | |
$.get("/html/portfolio/", function(data) { | |
build_list(data, that); | |
// displatch data loaded event. | |
}); | |
}; | |
Projects.prototype.get_archives = function() { | |
_archive = {}; | |
for ( var i = 0; i < this._list.length; i++ ) { | |
if ( this._list[i].name == "ARCHIVES" ) { | |
_archive = this._list[i]; | |
} | |
} | |
return _archive; | |
}; | |
Projects.prototype.get_active_projects = function() { | |
_active_p = []; | |
for ( var i = 0; i < this._list.length; i++ ) { | |
if ( this._list[i].visible == true ) { | |
_active_p.push(this._list[i]); | |
} | |
} | |
return _active_p; | |
}; | |
// End result | |
var p = new Projects(); | |
p.load(); | |
p.addEventListener("data_loaded", function(e) { | |
alert(e.target.get_archives().name); | |
}); |
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