Backbone event Events Subscribe to and publish source code small read

Nodejs has Eventemitter class, think backbone have an event module can do events binding and triggering, is the core module of backbone.

Backbone Event Module

• On Add custom events
• Off Delete custom events
• Trigger Send a custom event
• Once add a custom event that executes only once (internally dependent on _.once)
• Listento Adding an Observation object
• Listentoonce add an Observation object that executes only once
• Stoplistening deleting an added observation object

------------------------------------

   On:function (name, callback, context) {      if (!eventsapi (this, ' on ', name, [callback, context]) | |!callback) return THI s;      this._events | | (this._events = {});      var events = This._events[name] | | (This._events[name] = []);      Events.push ({callback:callback, context:context, Ctx:context | | this});      return this;    },

The _events attribute is added to the current instance of Bancbone.event, and all time subscribed through backbone.events is found on this property.

    _events={        name:[{callback:function () {}, Context:object, Ctx:object}],        name:[{callback:function () {}, Context:object, Ctx:object}]    }

　　

    Trigger:function (name) {      if (!this._events) return this;      var args = slice.call (arguments, 1);      if (!eventsapi (this, ' Trigger ', name, args)] return this;      var events = This._events[name];      var allevents = This._events.all;      if (events) triggerevents (events, args);      if (allevents) triggerevents (allevents, arguments);      return this;    }

Object {callback:function, context:object, Ctx:object}

  var triggerevents = function (events, args) {    var ev, i =-1, L = events.length, a1 = Args[0], a2 = args[1], a3 = args[ 2];    Switch (args.length) {case      0:while (++i < L) (ev = Events[i]). Callback.call (ev.ctx); return;      Case 1:while (++i < L) (ev = Events[i]). Callback.call (Ev.ctx, A1); return;      Case 2:while (++i < L) (ev = Events[i]). Callback.call (Ev.ctx, a1, A2); return;      Case 3:while (++i < L) (ev = Events[i]). Callback.call (Ev.ctx, A1, A2, A3); return;      Default:while (++i < L) (ev = Events[i]). callback.apply (Ev.ctx, args); return;    }  };

　　

Backbone event Events Subscribe to and publish source code small read