backbone todo example
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
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: orange;
border-radius: 10px;
} #todo-list li:hover .destroy {
display: block;
} #todo-list .destroy:hover {
background-position: 0 -20px;
} #todo-list li.editing {
border-bottom: none;
margin-top: -1px;
padding: 0;
} #todo-list li.editing:last-child {
margin-bottom: -1px;
} #todo-list li.editing .edit {
display: block;
width: 444px;
padding: 13px 15px 14px 20px;
margin: 0;
} #todo-list li.editing .view {
display: none;
} #todo-list li .view label {
word-break: break-word;
} #todo-list li .edit {
display: none;
} #todoapp footer {
display: none;
margin: 0 -20px -20px -20px;
overflow: hidden;
color: #555555;
background: #f4fce8;
border-top: 1px solid #ededed;
padding: 0 20px;
line-height: 37px;
-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;
} #clear-completed {
float: right;
line-height: 20px;
text-decoration: none;
background: rgba(0, 0, 0, 0.1);
color: #555555;
font-size: 11px;
margin-top: 8px;
margin-bottom: 8px;
padding: 0 10px 1px;
cursor: pointer;
-webkit-border-radius: 12px;
-moz-border-radius: 12px;
-ms-border-radius: 12px;
-o-border-radius: 12px;
border-radius: 12px;
-webkit-box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 0 0;
-moz-box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 0 0;
-ms-box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 0 0;
-o-box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 0 0;
box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 0 0;
} #clear-completed:hover {
background: rgba(0, 0, 0, 0.15);
-webkit-box-shadow: rgba(0, 0, 0, 0.3) 0 -1px 0 0;
-moz-box-shadow: rgba(0, 0, 0, 0.3) 0 -1px 0 0;
-ms-box-shadow: rgba(0, 0, 0, 0.3) 0 -1px 0 0;
-o-box-shadow: rgba(0, 0, 0, 0.3) 0 -1px 0 0;
box-shadow: rgba(0, 0, 0, 0.3) 0 -1px 0 0;
} #clear-completed:active {
position: relative;
top: 1px;
} #todo-count span {
font-weight: bold;
} #instructions {
margin: 10px auto;
color: #777777;
text-shadow: rgba(255, 255, 255, 0.8) 0 1px 0;
text-align: center;
} #instructions a {
color: #336699;
} #credits {
margin: 30px auto;
color: #999;
text-shadow: rgba(255, 255, 255, 0.8) 0 1px 0;
text-align: center;
} #credits a {
color: #888;
}
</style>
</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> <!-- 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> <script src="lib/json2.js"></script>
<script src="lib/jquery-latest.js"></script>
<script src="lib/underscore.js"></script>
<script src="lib/backbone.js"></script>
<script src="lib/backbone.localStorage.js"></script>
<script src="js/demo20.js"></script>
</body>
</html>
$(function(){
var Todo = Backbone.Model.extend({
defaults: function() {
return {
title: "empty todo...",
order: Todos.nextOrder(),
done: false
};
},
initialize: function() {
if (!this.get("title")) {
this.set({"title": this.defaults().title});
}
},
toggle: function() {
this.save({done: !this.get("done")});
}
});
var TodoList = Backbone.Collection.extend({
model: Todo,
localStorage: new Backbone.LocalStorage("todos-backbone"),
done: function() {
return this.filter(function(todo){ return todo.get('done'); });
},
remaining: function() {
return this.without.apply(this, this.done());
},
nextOrder: function() {
if (!this.length) return 1;
return this.last().get('order') + 1;
},
comparator: function(todo) {
return todo.get('order');
}
});
var Todos = new TodoList;
var TodoView = Backbone.View.extend({
tagName: "li",
template: _.template($('#item-template').html()),
events: {
"click .toggle" : "toggleDone",
"dblclick .view" : "edit",
"click a.destroy" : "clear",
"keypress .edit" : "updateOnEnter",
"blur .edit" : "close"
},
initialize: function() {
this.listenTo(this.model, 'change', this.render);
this.listenTo(this.model, 'destroy', this.remove);
},
render: function() {
this.$el.html(this.template(this.model.toJSON()));
this.$el.toggleClass('done', this.model.get('done'));
this.input = this.$('.edit');
return this;
},
toggleDone: function() {
this.model.toggle();
},
edit: function() {
this.$el.addClass("editing");
this.input.focus();
},
close: function() {
var value = this.input.val();
if (!value) {
this.clear();
} else {
this.model.save({title: value});
this.$el.removeClass("editing");
}
},
updateOnEnter: function(e) {
if (e.keyCode == 13) this.close();
},
clear: function() {
this.model.destroy();
}
});
var AppView = Backbone.View.extend({
el: $("#todoapp"),
statsTemplate: _.template($('#stats-template').html()),
events: {
"keypress #new-todo": "createOnEnter",
"click #clear-completed": "clearCompleted",
"click #toggle-all": "toggleAllComplete"
},
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 = $('#main');
Todos.fetch();
},
render: function() {
var done = Todos.done().length;
var remaining = Todos.remaining().length;
if (Todos.length) {
this.main.show();
this.footer.show();
this.footer.html(this.statsTemplate({done: done, remaining: remaining}));
} else {
this.main.hide();
this.footer.hide();
}
this.allCheckbox.checked = !remaining;
},
addOne: function(todo) {
var view = new TodoView({model: todo});
this.$("#todo-list").append(view.render().el);
},
addAll: function() {
Todos.each(this.addOne, this);
},
createOnEnter: function(e) {
if (e.keyCode != 13) return;
if (!this.input.val()) return;
Todos.create({title: this.input.val()});
this.input.val('');
},
clearCompleted: function() {
_.invoke(Todos.done(), 'destroy');
return false;
},
toggleAllComplete: function () {
var done = this.allCheckbox.checked;
Todos.each(function (todo) { todo.save({'done': done}); });
}
});
var App = new AppView;
});
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