Backbone todo, one page

todo.css

html,
body {
  margin: 0;
  padding: 0;
}

button {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font-size: 100%;
  vertical-align: baseline;
  font-family: inherit;
  color: inherit;
  -webkit-appearance: none;
  /*-moz-appearance: none;*/
  -ms-appearance: none;
  -o-appearance: none;
  appearance: none;
}

body {
  font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.4em;
  background-color: #eaeaea;
  color: #4d4d4d;
  width: 550px;
  margin: 0 auto;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  -ms-font-smoothing: antialiased;
  -o-font-smoothing: antialiased;
  font-smoothing: antialiased;
}

#todoapp {
  background: #fff;
  background: rgba(255, 255, 255, 0.9);
  margin: 130px 0 40px 0;
  border: 1px solid #ccc;
  position: relative;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
  box-shadow: 0 2px 6px 0 rgba(0, 0, 0, 0.2),
        0 25px 50px 0 rgba(0, 0, 0, 0.15);
}

#todoapp:before {
  content: '';
  border-left: 1px solid #f5d6d6;
  border-right: 1px solid #f5d6d6;
  width: 2px;
  position: absolute;
  top: 0;
  left: 40px;
  height: 100%;
}

#todoapp input::-webkit-input-placeholder {
  font-style: italic;
}

#todoapp input:-moz-placeholder {
  font-style: italic;
  color: #a9a9a9;
}

#todoapp h1 {
  position: absolute;
  top: -120px;
  width: 100%;
  font-size: 70px;
  font-weight: bold;
  text-align: center;
  color: #b3b3b3;
  color: rgba(255, 255, 255, 0.3);
  text-shadow: -1px -1px rgba(0, 0, 0, 0.2);
  -webkit-text-rendering: optimizeLegibility;
  -moz-text-rendering: optimizeLegibility;
  -ms-text-rendering: optimizeLegibility;
  -o-text-rendering: optimizeLegibility;
  text-rendering: optimizeLegibility;
}

#header {
  padding-top: 15px;
  border-radius: inherit;
}

#header:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 15px;
  z-index: 2;
  border-bottom: 1px solid #6c615c;
  background: #8d7d77;
  background: -webkit-gradient(linear, left top, left bottom, from(rgba(132, 110, 100, 0.8)),to(rgba(101, 84, 76, 0.8)));
  background: -webkit-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
  background: -moz-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
  background: -o-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
  background: -ms-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
  background: linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
  filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,StartColorStr='#9d8b83', EndColorStr='#847670');
  border-top-left-radius: 1px;
  border-top-right-radius: 1px;
}

#new-todo,
.edit {
  position: relative;
  margin: 0;
  width: 100%;
  font-size: 24px;
  font-family: inherit;
  line-height: 1.4em;
  border: 0;
  outline: none;
  color: inherit;
  padding: 6px;
  border: 1px solid #999;
  box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  -ms-font-smoothing: antialiased;
  -o-font-smoothing: antialiased;
  font-smoothing: antialiased;
}

#new-todo {
  padding: 16px 16px 16px 60px;
  border: none;
  background: rgba(0, 0, 0, 0.02);
  z-index: 2;
  box-shadow: none;
}

#main {
  position: relative;
  z-index: 2;
  border-top: 1px dotted #adadad;
}

label[for='toggle-all'] {
  display: none;
}

#toggle-all {
  position: absolute;
  top: -42px;
  left: -4px;
  width: 40px;
  text-align: center;
  border: none; /* Mobile Safari */
}

#toggle-all:before {
  content: '»';
  font-size: 28px;
  color: #d9d9d9;
  padding: 0 25px 7px;
}

#toggle-all:checked:before {
  color: #737373;
}

#todo-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

#todo-list li {
  position: relative;
  font-size: 24px;
  border-bottom: 1px dotted #ccc;
}

#todo-list li:last-child {
  border-bottom: none;
}

#todo-list li.editing {
  border-bottom: none;
  padding: 0;
}

#todo-list li.editing .edit {
  display: block;
  width: 506px;
  padding: 13px 17px 12px 17px;
  margin: 0 0 0 43px;
}

#todo-list li.editing .view {
  display: none;
}

#todo-list li .toggle {
  text-align: center;
  width: 40px;
  /* auto, since non-WebKit browsers doesn't support input styling */
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  border: none; /* Mobile Safari */
  -webkit-appearance: none;
  /*-moz-appearance: none;*/
  -ms-appearance: none;
  -o-appearance: none;
  appearance: none;
}

#todo-list li .toggle:after {
  content: '✔';
  line-height: 43px; /* 40 + a couple of pixels visual adjustment */
  font-size: 20px;
  color: #d9d9d9;
  text-shadow: 0 -1px 0 #bfbfbf;
}

#todo-list li .toggle:checked:after {
  color: #85ada7;
  text-shadow: 0 1px 0 #669991;
  bottom: 1px;
  position: relative;
}

#todo-list li label {
  word-break: break-word;
  padding: 15px;
  margin-left: 45px;
  display: block;
  line-height: 1.2;
  -webkit-transition: color 0.4s;
  -moz-transition: color 0.4s;
  -ms-transition: color 0.4s;
  -o-transition: color 0.4s;
  transition: color 0.4s;
}

#todo-list li.completed label {
  color: #a9a9a9;
  text-decoration: line-through;
}

#todo-list li .destroy {
  display: none;
  position: absolute;
  top: 0;
  right: 10px;
  bottom: 0;
  width: 40px;
  height: 40px;
  margin: auto 0;
  font-size: 22px;
  color: #a88a8a;
  -webkit-transition: all 0.2s;
  -moz-transition: all 0.2s;
  -ms-transition: all 0.2s;
  -o-transition: all 0.2s;
  transition: all 0.2s;
}

#todo-list li .destroy:hover {
  text-shadow: 0 0 1px #000,
         0 0 10px rgba(199, 107, 107, 0.8);
  -webkit-transform: scale(1.3);
  -moz-transform: scale(1.3);
  -ms-transform: scale(1.3);
  -o-transform: scale(1.3);
  transform: scale(1.3);
}

#todo-list li .destroy:after {
  content: '✖';
}

#todo-list li:hover .destroy {
  display: block;
}

#todo-list li .edit {
  display: none;
}

#todo-list li.editing:last-child {
  margin-bottom: -1px;
}

#footer {
  color: #777;
  padding: 0 15px;
  position: absolute;
  right: 0;
  bottom: -31px;
  left: 0;
  height: 20px;
  z-index: 1;
  text-align: center;
}

#footer:before {
  content: '';
  position: absolute;
  right: 0;
  bottom: 31px;
  left: 0;
  height: 50px;
  z-index: -1;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.3),
        0 6px 0 -3px rgba(255, 255, 255, 0.8),
        0 7px 1px -3px rgba(0, 0, 0, 0.3),
        0 43px 0 -6px rgba(255, 255, 255, 0.8),
        0 44px 2px -6px rgba(0, 0, 0, 0.2);
}

#todo-count {
  float: left;
  text-align: left;
}

#filters {
  margin: 0;
  padding: 0;
  list-style: none;
  position: absolute;
  right: 0;
  left: 0;
}

#filters li {
  display: inline;
}

#filters li a {
  color: #83756f;
  margin: 2px;
  text-decoration: none;
}

#filters li a.selected {
  font-weight: bold;
}

#clear-completed {
  float: right;
  position: relative;
  line-height: 20px;
  text-decoration: none;
  background: rgba(0, 0, 0, 0.1);
  font-size: 11px;
  padding: 0 10px;
  border-radius: 3px;
  box-shadow: 0 -1px 0 0 rgba(0, 0, 0, 0.2);
}

#clear-completed:hover {
  background: rgba(0, 0, 0, 0.15);
  box-shadow: 0 -1px 0 0 rgba(0, 0, 0, 0.3);
}

#info {
  margin: 65px auto 0;
  color: #a6a6a6;
  font-size: 12px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
  text-align: center;
}

#info a {
  color: inherit;
}

/*
  Hack to remove background from Mobile Safari.
  Can't use it globally since it destroys checkboxes in Firefox and Opera
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
  #toggle-all,
  #todo-list li .toggle {
    background: none;
  }

  #todo-list li .toggle {
    height: 40px;
  }

  #toggle-all {
    top: -56px;
    left: -15px;
    width: 65px;
    height: 41px;
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
    -webkit-appearance: none;
    appearance: none;
  }
}

.hidden{
  display:none;
}

todo.html

<section id="todoapp">
  <header id="header">
		<h1>todos</h1>
		<input id="new-todo" placeholder="What needs to be done?" autofocus>
	</header>
	<section id="main">
		<input id="toggle-all" type="checkbox">
		<label for="toggle-all">Mark all as complete</label>
		<ul id="todo-list"></ul>
	</section>
	<footer id="footer"></footer>
</section>
<div id="info">
	<p>Double-click to edit a todo</p>
	<p>Written by <a href="https://github.com/addyosmani">Addy Osmani</a></p>
	<p>Part of <a href="http://todomvc.com">TodoMVC</a></p>
</div>
<script type="text/template" id="item-template">
	<div class="view">
		<input class="toggle" type="checkbox" <%= completed ? 'checked' : '' %>>
		<label><%- title %></label>
		<button class="destroy"></button>
	</div>
	<input class="edit" value="<%- title %>">
</script>
<script type="text/template" id="stats-template">
	<span id="todo-count"><strong><%= remaining %></strong> <%= remaining === 1 ? 'item' : 'items' %> left</span>
	<ul id="filters">
		<li>
			<a class="selected" href="#/">All</a>
		</li>
		<li>
			<a href="#/active">Active</a>
		</li>
		<li>
			<a href="#/completed">Completed</a>
		</li>
	</ul>
	<% if (completed) { %>
	<button id="clear-completed">Clear completed (<%= completed %>)</button>
	<% } %>
</script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/lodash.js/0.9.2/lodash.underscore.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.10/backbone-min.js"></script>

todo.js

var app = app || {};

(function() {
  'use strict';

  // Todo Model
  // ----------

  // Our basic **Todo** model has `title`, `order`, and `completed` attributes.
  app.Todo = Backbone.Model.extend({

    // Default attributes for the todo
    // and ensure that each todo created has `title` and `completed` keys.
    defaults: {
      title: '',
      completed: false
    },

    // Toggle the `completed` state of this todo item.
    toggle: function() {
      this.save({
        completed: !this.get('completed')
      });
    }

  });

}());

var app = app || {};

(function() {
  'use strict';

  // Todo Collection
  // ---------------

  // The collection of todos is backed by *localStorage* instead of a remote
  // server.
  var TodoList = Backbone.Collection.extend({

    // Reference to this collection's model.
    model: app.Todo,

    url: '/api/todos',

    // Filter down the list of all todo items that are finished.
    completed: function() {
      return this.filter(function( todo ) {
        return todo.get('completed');
      });
    },

    // Filter down the list to only todo items that are still not finished.
    remaining: function() {
      return this.without.apply( this, this.completed() );
    },

    // We keep the Todos in sequential order, despite being saved by unordered
    // GUID in the database. This generates the next order number for new items.
    nextOrder: function() {
      if ( !this.length ) {
        return 1;
      }
      return this.last().get('order') + 1;
    },

    // Todos are sorted by their original insertion order.
    comparator: function( todo ) {
      return todo.get('order');
    }
  });

  // Create our global collection of **Todos**.
  app.Todos = new TodoList();

}());

var app = app || {};

$(function() {
  'use strict';

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

  // The DOM element for a todo item...
  app.TodoView = Backbone.View.extend({

    //... is a list tag.
    tagName:  'li',

    // Cache the template function for a single item.
    template: _.template( $('#item-template').html() ),

    // The DOM events specific to an item.
    events: {
      'click .toggle':  'togglecompleted',
      'dblclick label': 'edit',
      'click .destroy': 'clear',
      'keypress .edit': 'updateOnEnter',
      'blur .edit':   'close'
    },

    // The TodoView listens for changes to its model, re-rendering. Since there's
    // a one-to-one correspondence between a **Todo** and a **TodoView** in this
    // app, we set a direct reference on the model for convenience.
    initialize: function() {
      this.model.on( 'change', this.render, this );
      this.model.on( 'destroy', this.remove, this );
      this.model.on( 'visible', this.toggleVisible, this );
    },

    // Re-render the titles of the todo item.
    render: function() {
      this.$el.html( this.template( this.model.toJSON() ) );
      this.$el.toggleClass( 'completed', this.model.get('completed') );

      this.toggleVisible();
      this.input = this.$('.edit');
      return this;
    },

    toggleVisible : function () {
      this.$el.toggleClass( 'hidden',  this.isHidden());
    },

    isHidden : function () {
      var isCompleted = this.model.get('completed');
      return ( // hidden cases only
        (!isCompleted && app.TodoFilter === 'completed')
        || (isCompleted && app.TodoFilter === 'active')
      );
    },

    // Toggle the `"completed"` state of the model.
    togglecompleted: function() {
      this.model.toggle();
    },

    // Switch this view into `"editing"` mode, displaying the input field.
    edit: function() {
      this.$el.addClass('editing');
      this.input.focus();
    },

    // Close the `"editing"` mode, saving changes to the todo.
    close: function() {
      var value = this.input.val().trim();

      if ( value ) {
        this.model.save({ title: value });
      } else {
        this.clear();
      }

      this.$el.removeClass('editing');
    },

    // If you hit `enter`, we're through editing the item.
    updateOnEnter: function( e ) {
      if ( e.which === ENTER_KEY ) {
        this.close();
      }
    },

    // Remove the item, destroy the model from *localStorage* and delete its view.
    clear: function() {
      this.model.destroy();
    }
  });
});

var app = app || {};

$(function( $ ) {
  'use strict';

  // The Application
  // ---------------

  // Our overall **AppView** is the top-level piece of UI.
  app.AppView = Backbone.View.extend({

    // Instead of generating a new element, bind to the existing skeleton of
    // the App already present in the HTML.
    el: '#todoapp',

    // Our template for the line of statistics at the bottom of the app.
    statsTemplate: _.template( $('#stats-template').html() ),

    // Delegated events for creating new items, and clearing completed ones.
    events: {
      'keypress #new-todo': 'createOnEnter',
      'click #clear-completed': 'clearCompleted',
      'click #toggle-all': 'toggleAllComplete'
    },

    // At initialization we bind to the relevant events on the `Todos`
    // collection, when items are added or changed. Kick things off by
    // loading any preexisting todos that might be saved in *localStorage*.
    initialize: function() {
      this.input = this.$('#new-todo');
      this.allCheckbox = this.$('#toggle-all')[0];
      this.$footer = this.$('#footer');
      this.$main = this.$('#main');

      app.Todos.on( 'add', this.addOne, this );
      app.Todos.on( 'reset', this.addAll, this );
      app.Todos.on( 'change:completed', this.filterOne, this );
      app.Todos.on( 'filter', this.filterAll, this );
      app.Todos.on( 'all', this.render, this );

      app.Todos.fetch();
    },

    // Re-rendering the App just means refreshing the statistics -- the rest
    // of the app doesn't change.
    render: function() {
      var completed = app.Todos.completed().length;
      var remaining = app.Todos.remaining().length;

      if ( app.Todos.length ) {
        this.$main.show();
        this.$footer.show();

        this.$footer.html(this.statsTemplate({
          completed: completed,
          remaining: remaining
        }));

        this.$('#filters li a')
          .removeClass('selected')
          .filter('[href="#/' + ( app.TodoFilter || '' ) + '"]')
          .addClass('selected');
      } else {
        this.$main.hide();
        this.$footer.hide();
      }

      this.allCheckbox.checked = !remaining;
    },

    // Add a single todo item to the list by creating a view for it, and
    // appending its element to the `<ul>`.
    addOne: function( todo ) {
      var view = new app.TodoView({ model: todo });
      $('#todo-list').append( view.render().el );
    },

    // Add all items in the **Todos** collection at once.
    addAll: function() {
      this.$('#todo-list').html('');
      app.Todos.each(this.addOne, this);
    },

    filterOne : function (todo) {
      todo.trigger('visible');
    },

    filterAll : function () {
      app.Todos.each(this.filterOne, this);
    },

    // Generate the attributes for a new Todo item.
    newAttributes: function() {
      return {
        title: this.input.val().trim(),
        order: app.Todos.nextOrder(),
        completed: false
      };
    },

    // If you hit return in the main input field, create new **Todo** model,
    // persisting it to *localStorage*.
    createOnEnter: function( e ) {
      if ( e.which !== ENTER_KEY || !this.input.val().trim() ) {
        return;
      }

      app.Todos.create( this.newAttributes() );
      this.input.val('');
    },

    // Clear all completed todo items, destroying their models.
    clearCompleted: function() {
      _.each( app.Todos.completed(), function( todo ) {
        todo.destroy();
      });

      return false;
    },

    toggleAllComplete: function() {
      var completed = this.allCheckbox.checked;

      app.Todos.each(function( todo ) {
        todo.save({
          'completed': completed
        });
      });
    }
  });
});

var app = app || {};

(function() {
  'use strict';

  // Todo Router
  // ----------

  var Workspace = Backbone.Router.extend({
    routes:{
      '*filter': 'setFilter'
    },

    setFilter: function( param ) {
      // Set the current filter to be used
      app.TodoFilter = param.trim() || '';

      // Trigger a collection filter event, causing hiding/unhiding
      // of Todo view items
      app.Todos.trigger('filter');
    }
  });

  app.TodoRouter = new Workspace();
  Backbone.history.start();

}());

var app = app || {};
var ENTER_KEY = 13;

$(function() {

  // Kick things off by creating the **App**.
  new app.AppView();

});