backbone-filtered-collection/examples/map/js/backbone.marionette.js

Create a filtered version of a backbone collection that stays in sync.

// MarionetteJS (Backbone.Marionette)
// ----------------------------------
// v1.1.0
//
// Copyright (c)2013 Derick Bailey, Muted Solutions, LLC.
// Distributed under MIT license
//
// http://marionettejs.com



/*!
 * Includes BabySitter
 * https://github.com/marionettejs/backbone.babysitter/
 *
 * Includes Wreqr
 * https://github.com/marionettejs/backbone.wreqr/
 */

// Backbone.BabySitter
// -------------------
// v0.0.6
//
// Copyright (c)2013 Derick Bailey, Muted Solutions, LLC.
// Distributed under MIT license
//
// http://github.com/babysitterjs/backbone.babysitter

// Backbone.ChildViewContainer
// ---------------------------
//
// Provide a container to store, retrieve and
// shut down child views.

Backbone.ChildViewContainer = (function(Backbone, _){
  
  // Container Constructor
  // ---------------------

  var Container = function(views){
    this._views = {};
    this._indexByModel = {};
    this._indexByCustom = {};
    this._updateLength();

    _.each(views, this.add, this);
  };

  // Container Methods
  // -----------------

  _.extend(Container.prototype, {

    // Add a view to this container. Stores the view
    // by `cid` and makes it searchable by the model
    // cid (and model itself). Optionally specify
    // a custom key to store an retrieve the view.
    add: function(view, customIndex){
      var viewCid = view.cid;

      // store the view
      this._views[viewCid] = view;

      // index it by model
      if (view.model){
        this._indexByModel[view.model.cid] = viewCid;
      }

      // index by custom
      if (customIndex){
        this._indexByCustom[customIndex] = viewCid;
      }

      this._updateLength();
    },

    // Find a view by the model that was attached to
    // it. Uses the model's `cid` to find it.
    findByModel: function(model){
      return this.findByModelCid(model.cid);
    },

    // Find a view by the `cid` of the model that was attached to
    // it. Uses the model's `cid` to find the view `cid` and
    // retrieve the view using it.
    findByModelCid: function(modelCid){
      var viewCid = this._indexByModel[modelCid];
      return this.findByCid(viewCid);
    },

    // Find a view by a custom indexer.
    findByCustom: function(index){
      var viewCid = this._indexByCustom[index];
      return this.findByCid(viewCid);
    },

    // Find by index. This is not guaranteed to be a
    // stable index.
    findByIndex: function(index){
      return _.values(this._views)[index];
    },

    // retrieve a view by it's `cid` directly
    findByCid: function(cid){
      return this._views[cid];
    },

    // Remove a view
    remove: function(view){
      var viewCid = view.cid;

      // delete model index
      if (view.model){
        delete this._indexByModel[view.model.cid];
      }

      // delete custom index
      _.any(this._indexByCustom, function(cid, key) {
        if (cid === viewCid) {
          delete this._indexByCustom[key];
          return true;
        }
      }, this);

      // remove the view from the container
      delete this._views[viewCid];

      // update the length
      this._updateLength();
    },

    // Call a method on every view in the container,
    // passing parameters to the call method one at a
    // time, like `function.call`.
    call: function(method){
      this.apply(method, _.tail(arguments));
    },

    // Apply a method on every view in the container,
    // passing parameters to the call method one at a
    // time, like `function.apply`.
    apply: function(method, args){
      _.each(this._views, function(view){
        if (_.isFunction(view[method])){
          view[method].apply(view, args || []);
        }
      });
    },

    // Update the `.length` attribute on this container
    _updateLength: function(){
      this.length = _.size(this._views);
    }
  });

  // Borrowing this code from Backbone.Collection:
  // http://backbonejs.org/docs/backbone.html#section-106
  //
  // Mix in methods from Underscore, for iteration, and other
  // collection related features.
  var methods = ['forEach', 'each', 'map', 'find', 'detect', 'filter', 
    'select', 'reject', 'every', 'all', 'some', 'any', 'include', 
    'contains', 'invoke', 'toArray', 'first', 'initial', 'rest', 
    'last', 'without', 'isEmpty', 'pluck'];

  _.each(methods, function(method) {
    Container.prototype[method] = function() {
      var views = _.values(this._views);
      var args = [views].concat(_.toArray(arguments));
      return _[method].apply(_, args);
    };
  });

  // return the public API
  return Container;
})(Backbone, _);

// Backbone.Wreqr (Backbone.Marionette)
// ----------------------------------
// v0.2.0
//
// Copyright (c)2013 Derick Bailey, Muted Solutions, LLC.
// Distributed under MIT license
//
// http://github.com/marionettejs/backbone.wreqr


Backbone.Wreqr = (function(Backbone, Marionette, _){
  "use strict";
  var Wreqr = {};

  // Handlers
// --------
// A registry of functions to call, given a name

Wreqr.Handlers = (function(Backbone, _){
  "use strict";
  
  // Constructor
  // -----------

  var Handlers = function(options){
    this.options = options;
    this._wreqrHandlers = {};
    
    if (_.isFunction(this.initialize)){
      this.initialize(options);
    }
  };

  Handlers.extend = Backbone.Model.extend;

  // Instance Members
  // ----------------

  _.extend(Handlers.prototype, Backbone.Events, {

    // Add multiple handlers using an object literal configuration
    setHandlers: function(handlers){
      _.each(handlers, function(handler, name){
        var context = null;

        if (_.isObject(handler) && !_.isFunction(handler)){
          context = handler.context;
          handler = handler.callback;
        }

        this.setHandler(name, handler, context);
      }, this);
    },

    // Add a handler for the given name, with an
    // optional context to run the handler within
    setHandler: function(name, handler, context){
      var config = {
        callback: handler,
        context: context
      };

      this._wreqrHandlers[name] = config;

      this.trigger("handler:add", name, handler, context);
    },

    // Determine whether or not a handler is registered
    hasHandler: function(name){
      return !! this._wreqrHandlers[name];
    },

    // Get the currently registered handler for
    // the specified name. Throws an exception if
    // no handler is found.
    getHandler: function(name){
      var config = this._wreqrHandlers[name];

      if (!config){
        throw new Error("Handler not found for '" + name + "'");
      }

      return function(){
        var args = Array.prototype.slice.apply(arguments);
        return config.callback.apply(config.context, args);
      };
    },

    // Remove a handler for the specified name
    removeHandler: function(name){
      delete this._wreqrHandlers[name];
    },

    // Remove all handlers from this registry
    removeAllHandlers: function(){
      this._wreqrHandlers = {};
    }
  });

  return Handlers;
})(Backbone, _);

  // Wreqr.CommandStorage
// --------------------
//
// Store and retrieve commands for execution.
Wreqr.CommandStorage = (function(){
  "use strict";

  // Constructor function
  var CommandStorage = function(options){
    this.options = options;
    this._commands = {};

    if (_.isFunction(this.initialize)){
      this.initialize(options);
    }
  };

  // Instance methods
  _.extend(CommandStorage.prototype, Backbone.Events, {

    // Get an object literal by command name, that contains
    // the `commandName` and the `instances` of all commands
    // represented as an array of arguments to process
    getCommands: function(commandName){
      var commands = this._commands[commandName];

      // we don't have it, so add it
      if (!commands){

        // build the configuration
        commands = {
          command: commandName, 
          instances: []
        };

        // store it
        this._commands[commandName] = commands;
      }

      return commands;
    },

    // Add a command by name, to the storage and store the
    // args for the command
    addCommand: function(commandName, args){
      var command = this.getCommands(commandName);
      command.instances.push(args);
    },

    // Clear all commands for the given `commandName`
    clearCommands: function(commandName){
      var command = this.getCommands(commandName);
      command.instances = [];
    }
  });

  return CommandStorage;
})();

  // Wreqr.Commands
// --------------
//
// A simple command pattern implementation. Register a command
// handler and execute it.
Wreqr.Commands = (function(Wreqr){
  "use strict";

  return Wreqr.Handlers.extend({
    // default storage type
    storageType: Wreqr.CommandStorage,

    constructor: function(options){
      this.options = options || {};

      this._initializeStorage(this.options);
      this.on("handler:add", this._executeCommands, this);

      var args = Array.prototype.slice.call(arguments);
      Wreqr.Handlers.prototype.constructor.apply(this, args);
    },

    // Execute a named command with the supplied args
    execute: function(name, args){
      name = arguments[0];
      args = Array.prototype.slice.call(arguments, 1);

      if (this.hasHandler(name)){
        this.getHandler(name).apply(this, args);
      } else {
        this.storage.addCommand(name, args);
      }

    },

    // Internal method to handle bulk execution of stored commands
    _executeCommands: function(name, handler, context){
      var command = this.storage.getCommands(name);

      // loop through and execute all the stored command instances
      _.each(command.instances, function(args){
        handler.apply(context, args);
      });

      this.storage.clearCommands(name);
    },

    // Internal method to initialize storage either from the type's
    // `storageType` or the instance `options.storageType`.
    _initializeStorage: function(options){
      var storage;

      var StorageType = options.storageType || this.storageType;
      if (_.isFunction(StorageType)){
        storage = new StorageType();
      } else {
        storage = StorageType;
      }

      this.storage = storage;
    }
  });

})(Wreqr);

  // Wreqr.RequestResponse
// ---------------------
//
// A simple request/response implementation. Register a
// request handler, and return a response from it
Wreqr.RequestResponse = (function(Wreqr){
  "use strict";

  return Wreqr.Handlers.extend({
    request: function(){
      var name = arguments[0];
      var args = Array.prototype.slice.call(arguments, 1);

      return this.getHandler(name).apply(this, args);
    }
  });

})(Wreqr);

  // Event Aggregator
// ----------------
// A pub-sub object that can be used to decouple various parts
// of an application through event-driven architecture.

Wreqr.EventAggregator = (function(Backbone, _){
  "use strict";
  var EA = function(){};

  // Copy the `extend` function used by Backbone's classes
  EA.extend = Backbone.Model.extend;

  // Copy the basic Backbone.Events on to the event aggregator
  _.extend(EA.prototype, Backbone.Events);

  return EA;
})(Backbone, _);


  return Wreqr;
})(Backbone, Backbone.Marionette, _);

var Marionette = (function(global, Backbone, _){
  "use strict";

  // Define and export the Marionette namespace
  var Marionette = {};
  Backbone.Marionette = Marionette;

  // Get the DOM manipulator for later use
  Marionette.$ = Backbone.$;

// Helpers
// -------

// For slicing `arguments` in functions
var protoSlice = Array.prototype.slice;
function slice(args) {
  return protoSlice.call(args);
}

function throwError(message, name) {
  var error = new Error(message);
  error.name = name || 'Error';
  throw error;
}

// Marionette.extend
// -----------------

// Borrow the Backbone `extend` method so we can use it as needed
Marionette.extend = Backbone.Model.extend;

// Marionette.getOption
// --------------------

// Retrieve an object, function or other value from a target
// object or its `options`, with `options` taking precedence.
Marionette.getOption = function(target, optionName){
  if (!target || !optionName){ return; }
  var value;

  if (target.options && (optionName in target.options) && (target.options[optionName] !== undefined)){
    value = target.options[optionName];
  } else {
    value = target[optionName];
  }

  return value;
};

// Trigger an event and/or a corresponding method name. Examples:
//
// `this.triggerMethod("foo")` will trigger the "foo" event and
// call the "onFoo" method.
//
// `this.triggerMethod("foo:bar") will trigger the "foo:bar" event and
// call the "onFooBar" method.
Marionette.triggerMethod = (function(){

  // split the event name on the :
  var splitter = /(^|:)(\w)/gi;

  // take the event section ("section1:section2:section3")
  // and turn it in to uppercase name
  function getEventName(match, prefix, eventName) {
    return eventName.toUpperCase();
  }

  // actual triggerMethod name
  var triggerMethod = function(event) {
    // get the method name from the event name
    var methodName = 'on' + event.replace(splitter, getEventName);
    var method = this[methodName];

    // trigger the event, if a trigger method exists
    if(_.isFunction(this.trigger)) {
      this.trigger.apply(this, arguments);
    }

    // call the onMethodName if it exists
    if (_.isFunction(method)) {
      // pass all arguments, except the event name
      return method.apply(this, _.tail(arguments));
    }
  };

  return triggerMethod;
})();

// DOMRefresh
// ----------
//
// Monitor a view's state, and after it has been rendered and shown
// in the DOM, trigger a "dom:refresh" event every time it is
// re-rendered.

Marionette.MonitorDOMRefresh = (function(){
  // track when the view has been shown in the DOM,
  // using a Marionette.Region (or by other means of triggering "show")
  function handleShow(view){
    view._isShown = true;
    triggerDOMRefresh(view);
  }

  // track when the view has been rendered
  function handleRender(view){
    view._isRendered = true;
    triggerDOMRefresh(view);
  }

  // Trigger the "dom:refresh" event and corresponding "onDomRefresh" method
  function triggerDOMRefresh(view){
    if (view._isShown && view._isRendered){
      if (_.isFunction(view.triggerMethod)){
        view.triggerMethod("dom:refresh");
      }
    }
  }

  // Export public API
  return function(view){
    view.listenTo(view, "show", function(){
      handleShow(view);
    });

    view.listenTo(view, "render", function(){
      handleRender(view);
    });
  };
})();


// Marionette.bindEntityEvents & unbindEntityEvents
// ---------------------------
//
// These methods are used to bind/unbind a backbone "entity" (collection/model) 
// to methods on a target object. 
//
// The first parameter, `target`, must have a `listenTo` method from the
// EventBinder object.
//
// The second parameter is the entity (Backbone.Model or Backbone.Collection)
// to bind the events from.
//
// The third parameter is a hash of { "event:name": "eventHandler" }
// configuration. Multiple handlers can be separated by a space. A
// function can be supplied instead of a string handler name. 

(function(Marionette){
  "use strict";

  // Bind the event to handlers specified as a string of
  // handler names on the target object
  function bindFromStrings(target, entity, evt, methods){
    var methodNames = methods.split(/\s+/);

    _.each(methodNames,function(methodName) {

      var method = target[methodName];
      if(!method) {
        throwError("Method '"+ methodName +"' was configured as an event handler, but does not exist.");
      }

      target.listenTo(entity, evt, method, target);
    });
  }

  // Bind the event to a supplied callback function
  function bindToFunction(target, entity, evt, method){
      target.listenTo(entity, evt, method, target);
  }

  // Bind the event to handlers specified as a string of
  // handler names on the target object
  function unbindFromStrings(target, entity, evt, methods){
    var methodNames = methods.split(/\s+/);

    _.each(methodNames,function(methodName) {
      var method = target[methodName];
      target.stopListening(entity, evt, method, target);
    });
  }

  // Bind the event to a supplied callback function
  function unbindToFunction(target, entity, evt, method){
      target.stopListening(entity, evt, method, target);
  }

  
  // generic looping function
  function iterateEvents(target, entity, bindings, functionCallback, stringCallback){
    if (!entity || !bindings) { return; }

    // allow the bindings to be a function
    if (_.isFunction(bindings)){
      bindings = bindings.call(target);
    }

    // iterate the bindings and bind them
    _.each(bindings, function(methods, evt){

      // allow for a function as the handler, 
      // or a list of event names as a string
      if (_.isFunction(methods)){
        functionCallback(target, entity, evt, methods);
      } else {
        stringCallback(target, entity, evt, methods);
      }

    });
  }
 
  // Export Public API
  Marionette.bindEntityEvents = function(target, entity, bindings){
    iterateEvents(target, entity, bindings, bindToFunction, bindFromStrings);
  };

  Marionette.unbindEntityEvents = function(target, entity, bindings){
    iterateEvents(target, entity, bindings, unbindToFunction, unbindFromStrings);
  };

})(Marionette);


// Callbacks
// ---------

// A simple way of managing a collection of callbacks
// and executing them at a later point in time, using jQuery's
// `Deferred` object.
Marionette.Callbacks = function(){
  this._deferred = Marionette.$.Deferred();
  this._callbacks = [];
};

_.extend(Marionette.Callbacks.prototype, {

  // Add a callback to be executed. Callbacks added here are
  // guaranteed to execute, even if they are added after the 
  // `run` method is called.
  add: function(callback, contextOverride){
    this._callbacks.push({cb: callback, ctx: contextOverride});

    this._deferred.done(function(context, options){
      if (contextOverride){ context = contextOverride; }
      callback.call(context, options);
    });
  },

  // Run all registered callbacks with the context specified. 
  // Additional callbacks can be added after this has been run 
  // and they will still be executed.
  run: function(options, context){
    this._deferred.resolve(context, options);
  },

  // Resets the list of callbacks to be run, allowing the same list
  // to be run multiple times - whenever the `run` method is called.
  reset: function(){
    var callbacks = this._callbacks;
    this._deferred = Marionette.$.Deferred();
    this._callbacks = [];
    
    _.each(callbacks, function(cb){
      this.add(cb.cb, cb.ctx);
    }, this);
  }
});


// Marionette Controller
// ---------------------
//
// A multi-purpose object to use as a controller for
// modules and routers, and as a mediator for workflow
// and coordination of other objects, views, and more.
Marionette.Controller = function(options){
  this.triggerMethod = Marionette.triggerMethod;
  this.options = options || {};

  if (_.isFunction(this.initialize)){
    this.initialize(this.options);
  }
};

Marionette.Controller.extend = Marionette.extend;

// Controller Methods
// --------------

// Ensure it can trigger events with Backbone.Events
_.extend(Marionette.Controller.prototype, Backbone.Events, {
  close: function(){
    this.stopListening();
    this.triggerMethod("close");
    this.unbind();
  }
});

// Region 
// ------
//
// Manage the visual regions of your composite application. See
// http://lostechies.com/derickbailey/2011/12/12/composite-js-apps-regions-and-region-managers/

Marionette.Region = function(options){
  this.options = options || {};

  this.el = Marionette.getOption(this, "el");

  if (!this.el){
    var err = new Error("An 'el' must be specified for a region.");
    err.name = "NoElError";
    throw err;
  }

  if (this.initialize){
    var args = Array.prototype.slice.apply(arguments);
    this.initialize.apply(this, args);
  }
};


// Region Type methods
// -------------------

_.extend(Marionette.Region, {

  // Build an instance of a region by passing in a configuration object
  // and a default region type to use if none is specified in the config.
  //
  // The config object should either be a string as a jQuery DOM selector,
  // a Region type directly, or an object literal that specifies both
  // a selector and regionType:
  //
  // ```js
  // {
  //   selector: "#foo",
  //   regionType: MyCustomRegion
  // }
  // ```
  //
  buildRegion: function(regionConfig, defaultRegionType){

    var regionIsString = (typeof regionConfig === "string");
    var regionSelectorIsString = (typeof regionConfig.selector === "string");
    var regionTypeIsUndefined = (typeof regionConfig.regionType === "undefined");
    var regionIsType = (typeof regionConfig === "function");

    if (!regionIsType && !regionIsString && !regionSelectorIsString) {
      throw new Error("Region must be specified as a Region type, a selector string or an object with selector property");
    }

    var selector, RegionType;
   
    // get the selector for the region
    
    if (regionIsString) {
      selector = regionConfig;
    } 

    if (regionConfig.selector) {
      selector = regionConfig.selector;
    }

    // get the type for the region
    
    if (regionIsType){
      RegionType = regionConfig;
    }

    if (!regionIsType && regionTypeIsUndefined) {
      RegionType = defaultRegionType;
    }

    if (regionConfig.regionType) {
      RegionType = regionConfig.regionType;
    }
    
    // build the region instance
    var region = new RegionType({
      el: selector
    });

    // override the `getEl` function if we have a parentEl
    // this must be overridden to ensure the selector is found
    // on the first use of the region. if we try to assign the
    // region's `el` to `parentEl.find(selector)` in the object
    // literal to build the region, the element will not be
    // guaranteed to be in the DOM already, and will cause problems
    if (regionConfig.parentEl){

      region.getEl = function(selector) {
        var parentEl = regionConfig.parentEl;
        if (_.isFunction(parentEl)){
          parentEl = parentEl();
        }
        return parentEl.find(selector);
      };
    }

    return region;
  }

});

// Region Instance Methods
// -----------------------

_.extend(Marionette.Region.prototype, Backbone.Events, {

  // Displays a backbone view instance inside of the region.
  // Handles calling the `render` method for you. Reads content
  // directly from the `el` attribute. Also calls an optional
  // `onShow` and `close` method on your view, just after showing
  // or just before closing the view, respectively.
  show: function(view){

    this.ensureEl();

    var isViewClosed = view.isClosed || _.isUndefined(view.$el);

    var isDifferentView = view !== this.currentView;

    if (isDifferentView) {
      this.close();
    }

    view.render();

    if (isDifferentView || isViewClosed) {
      this.open(view);
    }
    
    this.currentView = view;

    Marionette.triggerMethod.call(this, "show", view);
    Marionette.triggerMethod.call(view, "show");
  },

  ensureEl: function(){
    if (!this.$el || this.$el.length === 0){
      this.$el = this.getEl(this.el);
    }
  },

  // Override this method to change how the region finds the
  // DOM element that it manages. Return a jQuery selector object.
  getEl: function(selector){
    return Marionette.$(selector);
  },

  // Override this method to change how the new view is
  // appended to the `$el` that the region is managing
  open: function(view){
    this.$el.empty().append(view.el);
  },

  // Close the current view, if there is one. If there is no
  // current view, it does nothing and returns immediately.
  close: function(){
    var view = this.currentView;
    if (!view || view.isClosed){ return; }

    // call 'close' or 'remove', depending on which is found
    if (view.close) { view.close(); }
    else if (view.remove) { view.remove(); }

    Marionette.triggerMethod.call(this, "close");

    delete this.currentView;
  },

  // Attach an existing view to the region. This 
  // will not call `render` or `onShow` for the new view, 
  // and will not replace the current HTML for the `el`
  // of the region.
  attachView: function(view){
    this.currentView = view;
  },

  // Reset the region by closing any existing view and
  // clearing out the cached `$el`. The next time a view
  // is shown via this region, the region will re-query the
  // DOM for the region's `el`.
  reset: function(){
    this.close();
    delete this.$el;
  }
});

// Copy the `extend` function used by Backbone's classes
Marionette.Region.extend = Marionette.extend;

// Marionette.RegionManager
// ------------------------
//
// Manage one or more related `Marionette.Region` objects.
Marionette.RegionManager = (function(Marionette){

  var RegionManager = Marionette.Controller.extend({
    constructor: function(options){
      this._regions = {};
      Marionette.Controller.prototype.constructor.call(this, options);
    },

    // Add multiple regions using an object literal, where
    // each key becomes the region name, and each value is
    // the region definition.
    addRegions: function(regionDefinitions, defaults){
      var regions = {};

      _.each(regionDefinitions, function(definition, name){
        if (typeof definition === "string"){
          definition = { selector: definition };
        }

        if (definition.selector){
          definition = _.defaults({}, definition, defaults);
        }

        var region = this.addRegion(name, definition);
        regions[name] = region;
      }, this);

      return regions;
    },

    // Add an individual region to the region manager,
    // and return the region instance
    addRegion: function(name, definition){
      var region;

      var isObject = _.isObject(definition);
      var isString = _.isString(definition);
      var hasSelector = !!definition.selector;

      if (isString || (isObject && hasSelector)){
        region = Marionette.Region.buildRegion(definition, Marionette.Region);
      } else if (_.isFunction(definition)){
        region = Marionette.Region.buildRegion(definition, Marionette.Region);
      } else {
        region = definition;
      }

      this._store(name, region);
      this.triggerMethod("region:add", name, region);
      return region;
    },

    // Get a region by name
    get: function(name){
      return this._regions[name];
    },

    // Remove a region by name
    removeRegion: function(name){
      var region = this._regions[name];
      this._remove(name, region);
    },

    // Close all regions in the region manager, and
    // remove them
    removeRegions: function(){
      _.each(this._regions, function(region, name){
        this._remove(name, region);
      }, this);
    },

    // Close all regions in the region manager, but
    // leave them attached
    closeRegions: function(){
      _.each(this._regions, function(region, name){
        region.close();
      }, this);
    },

    // Close all regions and shut down the region
    // manager entirely
    close: function(){
      this.removeRegions();
      var args = Array.prototype.slice.call(arguments);
      Marionette.Controller.prototype.close.apply(this, args);
    },

    // internal method to store regions
    _store: function(name, region){
      this._regions[name] = region;
      this._setLength();
    },

    // internal method to remove a region
    _remove: function(name, region){
      region.close();
      delete this._regions[name];
      this._setLength();
      this.triggerMethod("region:remove", name, region);
    },

    // set the number of regions current held
    _setLength: function(){
      this.length = _.size(this._regions);
    }

  });

  // Borrowing this code from Backbone.Collection:
  // http://backbonejs.org/docs/backbone.html#section-106
  //
  // Mix in methods from Underscore, for iteration, and other
  // collection related features.
  var methods = ['forEach', 'each', 'map', 'find', 'detect', 'filter', 
    'select', 'reject', 'every', 'all', 'some', 'any', 'include', 
    'contains', 'invoke', 'toArray', 'first', 'initial', 'rest', 
    'last', 'without', 'isEmpty', 'pluck'];

  _.each(methods, function(method) {
    RegionManager.prototype[method] = function() {
      var regions = _.values(this._regions);
      var args = [regions].concat(_.toArray(arguments));
      return _[method].apply(_, args);
    };
  });

  return RegionManager;
})(Marionette);


// Template Cache
// --------------

// Manage templates stored in `<script>` blocks,
// caching them for faster access.
Marionette.TemplateCache = function(templateId){
  this.templateId = templateId;
};

// TemplateCache object-level methods. Manage the template
// caches from these method calls instead of creating 
// your own TemplateCache instances
_.extend(Marionette.TemplateCache, {
  templateCaches: {},

  // Get the specified template by id. Either
  // retrieves the cached version, or loads it
  // from the DOM.
  get: function(templateId){
    var cachedTemplate = this.templateCaches[templateId];

    if (!cachedTemplate){
      cachedTemplate = new Marionette.TemplateCache(templateId);
      this.templateCaches[templateId] = cachedTemplate;
    }

    return cachedTemplate.load();
  },

  // Clear templates from the cache. If no arguments
  // are specified, clears all templates:
  // `clear()`
  //
  // If arguments are specified, clears each of the 
  // specified templates from the cache:
  // `clear("#t1", "#t2", "...")`
  clear: function(){
    var i;
    var args = slice(arguments);
    var length = args.length;

    if (length > 0){
      for(i=0; i<length; i++){
        delete this.templateCaches[args[i]];
      }
    } else {
      this.templateCaches = {};
    }
  }
});

// TemplateCache instance methods, allowing each
// template cache object to manage its own state
// and know whether or not it has been loaded
_.extend(Marionette.TemplateCache.prototype, {

  // Internal method to load the template
  load: function(){
    // Guard clause to prevent loading this template more than once
    if (this.compiledTemplate){
      return this.compiledTemplate;
    }

    // Load the template and compile it
    var template = this.loadTemplate(this.templateId);
    this.compiledTemplate = this.compileTemplate(template);

    return this.compiledTemplate;
  },

  // Load a template from the DOM, by default. Override
  // this method to provide your own template retrieval
  // For asynchronous loading with AMD/RequireJS, consider
  // using a template-loader plugin as described here: 
  // https://github.com/marionettejs/backbone.marionette/wiki/Using-marionette-with-requirejs
  loadTemplate: function(templateId){
    var template = Marionette.$(templateId).html();

    if (!template || template.length === 0){
      throwError("Could not find template: '" + templateId + "'", "NoTemplateError");
    }

    return template;
  },

  // Pre-compile the template before caching it. Override
  // this method if you do not need to pre-compile a template
  // (JST / RequireJS for example) or if you want to change
  // the template engine used (Handebars, etc).
  compileTemplate: function(rawTemplate){
    return _.template(rawTemplate);
  }
});


// Renderer
// --------

// Render a template with data by passing in the template
// selector and the data to render.
Marionette.Renderer = {

  // Render a template with data. The `template` parameter is
  // passed to the `TemplateCache` object to retrieve the
  // template function. Override this method to provide your own
  // custom rendering and template handling for all of Marionette.
  render: function(template, data){

    if (!template) {
      var error = new Error("Cannot render the template since it's false, null or undefined.");
      error.name = "TemplateNotFoundError";
      throw error;
    }

    var templateFunc;
    if (typeof template === "function"){
      templateFunc = template;
    } else {
      templateFunc = Marionette.TemplateCache.get(template);
    }

    return templateFunc(data);
  }
};



// Marionette.View
// ---------------

// The core view type that other Marionette views extend from.
Marionette.View = Backbone.View.extend({

  constructor: function(){
    _.bindAll(this, "render");

    var args = Array.prototype.slice.apply(arguments);
    Backbone.View.prototype.constructor.apply(this, args);

    Marionette.MonitorDOMRefresh(this);
    this.listenTo(this, "show", this.onShowCalled, this);
  },

  // import the "triggerMethod" to trigger events with corresponding
  // methods if the method exists 
  triggerMethod: Marionette.triggerMethod,

  // Get the template for this view
  // instance. You can set a `template` attribute in the view
  // definition or pass a `template: "whatever"` parameter in
  // to the constructor options.
  getTemplate: function(){
    return Marionette.getOption(this, "template");
  },

  // Mix in template helper methods. Looks for a
  // `templateHelpers` attribute, which can either be an
  // object literal, or a function that returns an object
  // literal. All methods and attributes from this object
  // are copies to the object passed in.
  mixinTemplateHelpers: function(target){
    target = target || {};
    var templateHelpers = Marionette.getOption(this, "templateHelpers");
    if (_.isFunction(templateHelpers)){
      templateHelpers = templateHelpers.call(this);
    }
    return _.extend(target, templateHelpers);
  },

  // Configure `triggers` to forward DOM events to view
  // events. `triggers: {"click .foo": "do:foo"}`
  configureTriggers: function(){
    if (!this.triggers) { return; }

    var triggerEvents = {};

    // Allow `triggers` to be configured as a function
    var triggers = _.result(this, "triggers");

    // Configure the triggers, prevent default
    // action and stop propagation of DOM events
    _.each(triggers, function(value, key){

      // build the event handler function for the DOM event
      triggerEvents[key] = function(e){

        // stop the event in its tracks
        if (e && e.preventDefault){ e.preventDefault(); }
        if (e && e.stopPropagation){ e.stopPropagation(); }

        // build the args for the event
        var args = {
          view: this,
          model: this.model,
          collection: this.collection
        };

        // trigger the event
        this.triggerMethod(value, args);
      };

    }, this);

    return triggerEvents;
  },

  // Overriding Backbone.View's delegateEvents to handle 
  // the `triggers`, `modelEvents`, and `collectionEvents` configuration
  delegateEvents: function(events){
    this._delegateDOMEvents(events);
    Marionette.bindEntityEvents(this, this.model, Marionette.getOption(this, "modelEvents"));
    Marionette.bindEntityEvents(this, this.collection, Marionette.getOption(this, "collectionEvents"));
  },

  // internal method to delegate DOM events and triggers
  _delegateDOMEvents: function(events){
    events = events || this.events;
    if (_.isFunction(events)){ events = events.call(this); }

    var combinedEvents = {};
    var triggers = this.configureTriggers();
    _.extend(combinedEvents, events, triggers);

    Backbone.View.prototype.delegateEvents.call(this, combinedEvents);
  },

  // Overriding Backbone.View's undelegateEvents to handle unbinding
  // the `triggers`, `modelEvents`, and `collectionEvents` config
  undelegateEvents: function(){
    var args = Array.prototype.slice.call(arguments);
    Backbone.View.prototype.undelegateEvents.apply(this, args);

    Marionette.unbindEntityEvents(this, this.model, Marionette.getOption(this, "modelEvents"));
    Marionette.unbindEntityEvents(this, this.collection, Marionette.getOption(this, "collectionEvents"));
  },

  // Internal method, handles the `show` event.
  onShowCalled: function(){},

  // Default `close` implementation, for removing a view from the
  // DOM and unbinding it. Regions will call this method
  // for you. You can specify an `onClose` method in your view to
  // add custom code that is called after the view is closed.
  close: function(){
    if (this.isClosed) { return; }

    // allow the close to be stopped by returning `false`
    // from the `onBeforeClose` method
    var shouldClose = this.triggerMethod("before:close");
    if (shouldClose === false){
      return;
    }

    // mark as closed before doing the actual close, to
    // prevent infinite loops within "close" event handlers
    // that are trying to close other views
    this.isClosed = true;
    this.triggerMethod("close");

    // unbind UI elements
    this.unbindUIElements();

    // remove the view from the DOM
    this.remove();
  },

  // This method binds the elements specified in the "ui" hash inside the view's code with
  // the associated jQuery selectors.
  bindUIElements: function(){
    if (!this.ui) { return; }

    // store the ui hash in _uiBindings so they can be reset later
    // and so re-rendering the view will be able to find the bindings
    if (!this._uiBindings){
      this._uiBindings = this.ui;
    }

    // get the bindings result, as a function or otherwise
    var bindings = _.result(this, "_uiBindings");

    // empty the ui so we don't have anything to start with
    this.ui = {};

    // bind each of the selectors
    _.each(_.keys(bindings), function(key) {
      var selector = bindings[key];
      this.ui[key] = this.$(selector);
    }, this);
  },

  // This method unbinds the elements specified in the "ui" hash
  unbindUIElements: function(){
    if (!this.ui || !this._uiBindings){ return; }

    // delete all of the existing ui bindings
    _.each(this.ui, function($el, name){
      delete this.ui[name];
    }, this);

    // reset the ui element to the original bindings configuration
    this.ui = this._uiBindings;
    delete this._uiBindings;
  }
});

// Item View
// ---------

// A single item view implementation that contains code for rendering
// with underscore.js templates, serializing the view's model or collection,
// and calling several methods on extended views, such as `onRender`.
Marionette.ItemView = Marionette.View.extend({
  
  // Setting up the inheritance chain which allows changes to 
  // Marionette.View.prototype.constructor which allows overriding
  constructor: function(){
    Marionette.View.prototype.constructor.apply(this, slice(arguments));
  },

  // Serialize the model or collection for the view. If a model is
  // found, `.toJSON()` is called. If a collection is found, `.toJSON()`
  // is also called, but is used to populate an `items` array in the
  // resulting data. If both are found, defaults to the model.
  // You can override the `serializeData` method in your own view
  // definition, to provide custom serialization for your view's data.
  serializeData: function(){
    var data = {};

    if (this.model) {
      data = this.model.toJSON();
    }
    else if (this.collection) {
      data = { items: this.collection.toJSON() };
    }

    return data;
  },

  // Render the view, defaulting to underscore.js templates.
  // You can override this in your view definition to provide
  // a very specific rendering for your view. In general, though,
  // you should override the `Marionette.Renderer` object to
  // change how Marionette renders views.
  render: function(){
    this.isClosed = false;

    this.triggerMethod("before:render", this);
    this.triggerMethod("item:before:render", this);

    var data = this.serializeData();
    data = this.mixinTemplateHelpers(data);

    var template = this.getTemplate();
    var html = Marionette.Renderer.render(template, data);

    this.$el.html(html);
    this.bindUIElements();

    this.triggerMethod("render", this);
    this.triggerMethod("item:rendered", this);

    return this;
  },

  // Override the default close event to add a few
  // more events that are triggered.
  close: function(){
    if (this.isClosed){ return; }

    this.triggerMethod('item:before:close');

    Marionette.View.prototype.close.apply(this, slice(arguments));

    this.triggerMethod('item:closed');
  }
});

// Collection View
// ---------------

// A view that iterates over a Backbone.Collection
// and renders an individual ItemView for each model.
Marionette.CollectionView = Marionette.View.extend({
  // used as the prefix for item view events
  // that are forwarded through the collectionview
  itemViewEventPrefix: "itemview",

  // constructor
  constructor: function(options){
    this._initChildViewStorage();

    Marionette.View.prototype.constructor.apply(this, slice(arguments));

    this._initialEvents();
  },

  // Configured the initial events that the collection view
  // binds to. Override this method to prevent the initial
  // events, or to add your own initial events.
  _initialEvents: function(){
    if (this.collection){
      this.listenTo(this.collection, "add", this.addChildView, this);
      this.listenTo(this.collection, "remove", this.removeItemView, this);
      this.listenTo(this.collection, "reset", this.render, this);
    }
  },

  // Handle a child item added to the collection
  addChildView: function(item, collection, options){
    this.closeEmptyView();
    var ItemView = this.getItemView(item);
    var index = this.collection.indexOf(item);
    this.addItemView(item, ItemView, index);
  },

  // Override from `Marionette.View` to guarantee the `onShow` method
  // of child views is called.
  onShowCalled: function(){
    this.children.each(function(child){
      Marionette.triggerMethod.call(child, "show");
    });
  },

  // Internal method to trigger the before render callbacks
  // and events
  triggerBeforeRender: function(){
    this.triggerMethod("before:render", this);
    this.triggerMethod("collection:before:render", this);
  },

  // Internal method to trigger the rendered callbacks and
  // events
  triggerRendered: function(){
    this.triggerMethod("render", this);
    this.triggerMethod("collection:rendered", this);
  },

  // Render the collection of items. Override this method to
  // provide your own implementation of a render function for
  // the collection view.
  render: function(){
    this.isClosed = false;
    this.triggerBeforeRender();
    this._renderChildren();
    this.triggerRendered();
    return this;
  },

  // Internal method. Separated so that CompositeView can have
  // more control over events being triggered, around the rendering
  // process
  _renderChildren: function(){
    this.closeEmptyView();
    this.closeChildren();

    if (this.collection && this.collection.length > 0) {
      this.showCollection();
    } else {
      this.showEmptyView();
    }
  },

  // Internal method to loop through each item in the
  // collection view and show it
  showCollection: function(){
    var ItemView;
    this.collection.each(function(item, index){
      ItemView = this.getItemView(item);
      this.addItemView(item, ItemView, index);
    }, this);
  },

  // Internal method to show an empty view in place of
  // a collection of item views, when the collection is
  // empty
  showEmptyView: function(){
    var EmptyView = Marionette.getOption(this, "emptyView");

    if (EmptyView && !this._showingEmptyView){
      this._showingEmptyView = true;
      var model = new Backbone.Model();
      this.addItemView(model, EmptyView, 0);
    }
  },

  // Internal method to close an existing emptyView instance
  // if one exists. Called when a collection view has been
  // rendered empty, and then an item is added to the collection.
  closeEmptyView: function(){
    if (this._showingEmptyView){
      this.closeChildren();
      delete this._showingEmptyView;
    }
  },

  // Retrieve the itemView type, either from `this.options.itemView`
  // or from the `itemView` in the object definition. The "options"
  // takes precedence.
  getItemView: function(item){
    var itemView = Marionette.getOption(this, "itemView");

    if (!itemView){
      throwError("An `itemView` must be specified", "NoItemViewError");
    }

    return itemView;
  },

  // Render the child item's view and add it to the
  // HTML for the collection view.
  addItemView: function(item, ItemView, index){
    // get the itemViewOptions if any were specified
    var itemViewOptions = Marionette.getOption(this, "itemViewOptions");
    if (_.isFunction(itemViewOptions)){
      itemViewOptions = itemViewOptions.call(this, item, index);
    }

    // build the view 
    var view = this.buildItemView(item, ItemView, itemViewOptions);
    
    // set up the child view event forwarding
    this.addChildViewEventForwarding(view);

    // this view is about to be added
    this.triggerMethod("before:item:added", view);

    // Store the child view itself so we can properly
    // remove and/or close it later
    this.children.add(view);

    // Render it and show it
    this.renderItemView(view, index);

    // call the "show" method if the collection view
    // has already been shown
    if (this._isShown){
      Marionette.triggerMethod.call(view, "show");
    }

    // this view was added
    this.triggerMethod("after:item:added", view);
  },

  // Set up the child view event forwarding. Uses an "itemview:"
  // prefix in front of all forwarded events.
  addChildViewEventForwarding: function(view){
    var prefix = Marionette.getOption(this, "itemViewEventPrefix");

    // Forward all child item view events through the parent,
    // prepending "itemview:" to the event name
    this.listenTo(view, "all", function(){
      var args = slice(arguments);
      args[0] = prefix + ":" + args[0];
      args.splice(1, 0, view);

      Marionette.triggerMethod.apply(this, args);
    }, this);
  },

  // render the item view
  renderItemView: function(view, index) {
    view.render();
    this.appendHtml(this, view, index);
  },

  // Build an `itemView` for every model in the collection.
  buildItemView: function(item, ItemViewType, itemViewOptions){
    var options = _.extend({model: item}, itemViewOptions);
    return new ItemViewType(options);
  },

  // get the child view by item it holds, and remove it
  removeItemView: function(item){
    var view = this.children.findByModel(item);
    this.removeChildView(view);
    this.checkEmpty();
  },

  // Remove the child view and close it
  removeChildView: function(view){

    // shut down the child view properly,
    // including events that the collection has from it
    if (view){
      this.stopListening(view);

      // call 'close' or 'remove', depending on which is found
      if (view.close) { view.close(); }
      else if (view.remove) { view.remove(); }

      this.children.remove(view);
    }

    this.triggerMethod("item:removed", view);
  },

  // helper to show the empty view if the collection is empty
  checkEmpty: function() {
    // check if we're empty now, and if we are, show the
    // empty view
    if (!this.collection || this.collection.length === 0){
      this.showEmptyView();
    }
  },

  // Append the HTML to the collection's `el`.
  // Override this method to do something other
  // then `.append`.
  appendHtml: function(collectionView, itemView, index){
    collectionView.$el.append(itemView.el);
  },

  // Internal method to set up the `children` object for
  // storing all of the child views
  _initChildViewStorage: function(){
    this.children = new Backbone.ChildViewContainer();
  },

  // Handle cleanup and other closing needs for
  // the collection of views.
  close: function(){
    if (this.isClosed){ return; }

    this.triggerMethod("collection:before:close");
    this.closeChildren();
    this.triggerMethod("collection:closed");

    Marionette.View.prototype.close.apply(this, slice(arguments));
  },

  // Close the child views that this collection view
  // is holding on to, if any
  closeChildren: function(){
    this.children.each(function(child){
      this.removeChildView(child);
    }, this);
    this.checkEmpty();
  }
});


// Composite View
// --------------

// Used for rendering a branch-leaf, hierarchical structure.
// Extends directly from CollectionView and also renders an
// an item view as `modelView`, for the top leaf
Marionette.CompositeView = Marionette.CollectionView.extend({

  // Setting up the inheritance chain which allows changes to
  // Marionette.CollectionView.prototype.constructor which allows overriding
  constructor: function(){
    Marionette.CollectionView.prototype.constructor.apply(this, slice(arguments));
  },

  // Configured the initial events that the composite view
  // binds to. Override this method to prevent the initial
  // events, or to add your own initial events.
  _initialEvents: function(){
    if (this.collection){
      this.listenTo(this.collection, "add", this.addChildView, this);
      this.listenTo(this.collection, "remove", this.removeItemView, this);
      this.listenTo(this.collection, "reset", this._renderChildren, this);
    }
  },

  // Retrieve the `itemView` to be used when rendering each of
  // the items in the collection. The default is to return
  // `this.itemView` or Marionette.CompositeView if no `itemView`
  // has been defined
  getItemView: function(item){
    var itemView = Marionette.getOption(this, "itemView") || this.constructor;

    if (!itemView){
      throwError("An `itemView` must be specified", "NoItemViewError");
    }

    return itemView;
  },

  // Serialize the collection for the view.
  // You can override the `serializeData` method in your own view
  // definition, to provide custom serialization for your view's data.
  serializeData: function(){
    var data = {};

    if (this.model){