[转]backbone.js 示例 todos
本文转自：http://www.css88.com/doc/backbone/examples/todos/index.html
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="utf-8">
<title>Backbone.js Todos</title>
<link rel="stylesheet" href="todos.css"/>
</head> <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/">Jérôme Gravel-Niquet</a>.
<br />Rewritten by: <a href="http://addyosmani.github.com/todomvc">TodoMVC</a>.
</div> <script src="../../test/vendor/json2.js"></script>
<script src="../../test/vendor/jquery.js"></script>
<script src="../../test/vendor/underscore.js"></script>
<script src="../../backbone.js"></script>
<script src="../backbone.localStorage.js"></script>
<script src="todos.js"></script> <!-- 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>
// An example Backbone application contributed by
// [Jérôme Gravel-Niquet](http://jgn.me/). This demo uses a simple
// [LocalStorage adapter](backbone-localstorage.html)
// to persist Backbone models within your browser. // Load the application once the DOM is ready, using `jQuery.ready`:
$(function(){ // Todo Model
// ---------- // Our basic **Todo** model has `title`, `order`, and `done` attributes.
var Todo = Backbone.Model.extend({ // Default attributes for the todo item.
defaults: function() {
return {
title: "empty todo...",
order: Todos.nextOrder(),
done: false
};
}, // Toggle the `done` state of this todo item.
toggle: function() {
this.save({done: !this.get("done")});
} }); // Todo Collection
// --------------- // The collection of todos is backed by *localStorage* instead of a remote
// server.
var TodoList = Backbone.Collection.extend({ // Reference to this collection's model.
model: Todo, // Save all of the todo items under the `"todos-backbone"` namespace.
localStorage: new Backbone.LocalStorage("todos-backbone"), // Filter down the list of all todo items that are finished.
done: function() {
return this.where({done: true});
}, // Filter down the list to only todo items that are still not finished.
remaining: function() {
return this.where({done: false});
}, // We keep the Todos in sequential order, despite being saved by unordered
// GUID in the database. This generates the next order number for new items.
nextOrder: function() {
if (!this.length) return 1;
return this.last().get('order') + 1;
}, // Todos are sorted by their original insertion order.
comparator: 'order' }); // Create our global collection of **Todos**.
var Todos = new TodoList; // Todo Item View
// -------------- // The DOM element for a todo item...
var TodoView = Backbone.View.extend({ //... is a list tag.
tagName: "li", // Cache the template function for a single item.
template: _.template($('#item-template').html()), // The DOM events specific to an item.
events: {
"click .toggle" : "toggleDone",
"dblclick .view" : "edit",
"click a.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.listenTo(this.model, 'change', this.render);
this.listenTo(this.model, 'destroy', this.remove);
}, // Re-render the titles of the todo item.
render: function() {
this.$el.html(this.template(this.model.toJSON()));
this.$el.toggleClass('done', this.model.get('done'));
this.input = this.$('.edit');
return this;
}, // Toggle the `"done"` state of the model.
toggleDone: function() {
this.model.toggle();
}, // Switch this view into `"editing"` mode, displaying the input field.
edit: function() {
this.$el.addClass("editing");
this.input.focus();
}, // Close the `"editing"` mode, saving changes to the todo.
close: function() {
var value = this.input.val();
if (!value) {
this.clear();
} else {
this.model.save({title: value});
this.$el.removeClass("editing");
}
}, // If you hit `enter`, we're through editing the item.
updateOnEnter: function(e) {
if (e.keyCode == 13) this.close();
}, // Remove the item, destroy the model.
clear: function() {
this.model.destroy();
} }); // The Application
// --------------- // Our overall **AppView** is the top-level piece of UI.
var 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.listenTo(Todos, 'add', this.addOne);
this.listenTo(Todos, 'reset', this.addAll);
this.listenTo(Todos, 'all', this.render); this.footer = this.$('footer');
this.main = $('#main'); Todos.fetch();
}, // Re-rendering the App just means refreshing the statistics -- the rest
// of the app doesn't change.
render: function() {
var done = Todos.done().length;
var remaining = Todos.remaining().length; if (Todos.length) {
this.main.show();
this.footer.show();
this.footer.html(this.statsTemplate({done: done, remaining: remaining}));
} else {
this.main.hide();
this.footer.hide();
} this.allCheckbox.checked = !remaining;
}, // Add a single todo item to the list by creating a view for it, and
// appending its element to the `<ul>`.
addOne: function(todo) {
var view = new TodoView({model: todo});
this.$("#todo-list").append(view.render().el);
}, // Add all items in the **Todos** collection at once.
addAll: function() {
Todos.each(this.addOne, this);
}, // If you hit return in the main input field, create new **Todo** model,
// persisting it to *localStorage*.
createOnEnter: function(e) {
if (e.keyCode != 13) return;
if (!this.input.val()) return; Todos.create({title: this.input.val()});
this.input.val('');
}, // Clear all done todo items, destroying their models.
clearCompleted: function() {
_.invoke(Todos.done(), 'destroy');
return false;
}, toggleAllComplete: function () {
var done = this.allCheckbox.checked;
Todos.each(function (todo) { todo.save({'done': done}); });
} }); // Finally, we kick things off by creating the **App**.
var App = new AppView; });
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