Backbone training - session 1

HTML

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.0.0/backbone-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/backbone-localstorage.js/1.1.0/backbone.localStorage-min.js"></script>
<body>
    <div id="todoapp">
        <header>
             <h1>Todos</h1>

            <input id="new-todo" type="text" placeholder="What needs to be done?">
        </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> <a id="clear-completed">Clear completed</a>

            <div id="todo-count"></div>
        </footer>
    </div>
    <div id="instructions">Double-click to edit a todo.</div>
    <div id="credits">Created by
        <br /> <a href="http://jgn.me/">J&eacute;r&ocirc;me Gravel-Niquet</a>.
        <br />Rewritten by: <a href="http://addyosmani.github.com/todomvc">TodoMVC</a>.</div>
    <!-- Templates -->
    <script type="text/template" id="item-template">
        < div class = "view" > < input class = "toggle"
        type = "checkbox" <%= done ? 'checked="checked"' : '' %> />
      <label><%- title %></label > < a class = "destroy" > < /a>
     </div > < input class = "edit"
        type = "text"
        value = "<%- title %>" / >
    </script>
    <script type="text/template" id="stats-template">
        <%
        if (done) { %> < a id = "clear-completed" > Clear <%= done %> completed <%= done == 1 ? 'item' : 'items' %> < /a>
    <% } %>
    <div class="todo-count"><b><%= remaining %></b > <%= remaining == 1 ? 'item' : 'items' %> left < /div>
    </script>
</body>

</html>

CSS

html, body {
    margin: 0;
    padding: 0;
}
body {
    font: 14px"Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.4em;
    background: #eeeeee;
    color: #333333;
    width: 520px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
}
#todoapp {
    background: #fff;
    padding: 20px;
    margin-bottom: 40px;
    -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0 2px 6px 0;
    -moz-box-shadow: rgba(0, 0, 0, 0.2) 0 2px 6px 0;
    -ms-box-shadow: rgba(0, 0, 0, 0.2) 0 2px 6px 0;
    -o-box-shadow: rgba(0, 0, 0, 0.2) 0 2px 6px 0;
    box-shadow: rgba(0, 0, 0, 0.2) 0 2px 6px 0;
    -webkit-border-radius: 0 0 5px 5px;
    -moz-border-radius: 0 0 5px 5px;
    -ms-border-radius: 0 0 5px 5px;
    -o-border-radius: 0 0 5px 5px;
    border-radius: 0 0 5px 5px;
}
#todoapp h1 {
    font-size: 36px;
    font-weight: bold;
    text-align: center;
    padding: 0 0 10px 0;
}
#todoapp input[type="text"] {
    width: 466px;
    font-size: 24px;
    font-family: inherit;
    line-height: 1.4em;
    border: 0;
    outline: none;
    padding: 6px;
    border: 1px solid #999999;
    -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0 1px 2px 0 inset;
    -moz-box-shadow: rgba(0, 0, 0, 0.2) 0 1px 2px 0 inset;
    -ms-box-shadow: rgba(0, 0, 0, 0.2) 0 1px 2px 0 inset;
    -o-box-shadow: rgba(0, 0, 0, 0.2) 0 1px 2px 0 inset;
    box-shadow: rgba(0, 0, 0, 0.2) 0 1px 2px 0 inset;
}
#todoapp input::-webkit-input-placeholder {
    font-style: italic;
}
#main {
    display: none;
}
#todo-list {
    margin: 10px 0;
    padding: 0;
    list-style: none;
}
#todo-list li {
    padding: 18px 20px 18px 0;
    position: relative;
    font-size: 24px;
    border-bottom: 1px solid #cccccc;
}
#todo-list li:last-child {
    border-bottom: none;
}
#todo-list li.done label {
    color: #777777;
    text-decoration: line-through;
}
#todo-list .destroy {
    position: absolute;
    right: 5px;
    top: 20px;
    display: none;
    cursor: pointer;
    width: 20px;
    height: 20px;
    background:...

JavaScript

$(function () {

    var ToDo = Backbone.Model.extend({
        defaults: function () {
            return {
                title: "What to do?",
                done: false
            };
        },
        /*
        localStorage: new Backbone.LocalStorage("backbone-todos"),*/
        toggleDone: function () {
            this.save({
                "done": !this.get("done")
            });
        }
    });

    //var todo = new ToDo();

    var ToDoView = Backbone.View.extend({
        initialize: function () {
            this.listenTo(this.model, "change", this.render);
        },
        events: {
            'click .toggle': "toggleDone",
                'dblclick .view': "edit",
                'keypress .edit': "editDone"
        },
        template: _.template($("#item-template").html()),
        tagName: "li",
        render: function () {
            this.$el.empty();
            this.$el.append(this.template(this.model.toJSON()));
            this.input = this.$el.find(".edit");
            return this;
        },
        toggleDone: function () {
            this.model.toggleDone();
            this.$el.toggleClass("done", this.model.get("done"));
        },
        edit: function () {
            this.$el.addClass("editing");
            this.input.focus();
        },
        editDone: function (e) {
            if (e.keyCode == 13) {
                this.model.save({
                    "title": this.input.val()
                });
                this.$el.removeClass("editing");
            }

        }
    });

    var ToDoCollection = Backbone.Collection.extend({
        model: ToDo,
        localStorage: new Backbone.LocalStorage("backbone-todos")
    });

    var toDos = new ToDoCollection();

    var AppView = Backbone.View.extend({
        el: $("#todoapp"),
        events: {
            "keypress #new-todo": "createTodo"
              //  "click #toggle-all": "toggleAll"
        },
        initialize: function () {
            this.input...