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todos.html
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<!DOCTYPE html>
<html>
<head>
<title>todos.js</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
<link rel="stylesheet" media="all" href="docco.css" />
</head>
<body>
<div id="container">
<div id="background"></div>
<ul id="jump_to">
<li>
<a class="large" href="javascript:void(0);">Jump To …</a>
<a class="small" href="javascript:void(0);">+</a>
<div id="jump_wrapper">
<div id="jump_page_wrapper">
<div id="jump_page">
<a class="source" href="backbone.localStorage.html">
backbone.localStorage.js
</a>
<a class="source" href="todos.html">
todos.js
</a>
</div>
</div>
</li>
</ul>
<ul class="sections">
<li id="title">
<div class="annotation">
<h1>todos.js</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-1">¶</a>
</div>
<p>An example Backbone application contributed by
<a href="http://jgn.me/">Jérôme Gravel-Niquet</a>. This demo uses a simple
<a href="backbone.localstorage.html">LocalStorage adapter</a>
to persist Backbone models within your browser.</p>
</div>
</li>
<li id="section-2">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-2">¶</a>
</div>
<p>Load the application once the DOM is ready, using <code>jQuery.ready</code>:</p>
</div>
<div class="content"><div class='highlight'><pre>$(<span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span></span>{</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-3">¶</a>
</div>
<h2 id="todo-model">Todo Model</h2>
</div>
</li>
<li id="section-4">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-4">¶</a>
</div>
</div>
</li>
<li id="section-5">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-5">¶</a>
</div>
<p>Our basic <strong>Todo</strong> model has <code>title</code>, <code>order</code>, and <code>done</code> attributes.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> Todo = Backbone.Model.extend({</pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-6">¶</a>
</div>
<p>Default attributes for the todo item.</p>
</div>
<div class="content"><div class='highlight'><pre> defaults: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">return</span> {
title: <span class="hljs-string">"empty todo..."</span>,
order: Todos.nextOrder(),
done: <span class="hljs-literal">false</span>
};
},</pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-7">¶</a>
</div>
<p>Toggle the <code>done</code> state of this todo item.</p>
</div>
<div class="content"><div class='highlight'><pre> toggle: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.save({done: !<span class="hljs-keyword">this</span>.get(<span class="hljs-string">"done"</span>)});
}
});</pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-8">¶</a>
</div>
<h2 id="todo-collection">Todo Collection</h2>
</div>
</li>
<li id="section-9">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-9">¶</a>
</div>
</div>
</li>
<li id="section-10">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">¶</a>
</div>
<p>The collection of todos is backed by <em>localStorage</em> instead of a remote
server.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> TodoList = Backbone.Collection.extend({</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">¶</a>
</div>
<p>Reference to this collection’s model.</p>
</div>
<div class="content"><div class='highlight'><pre> model: Todo,</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-12">¶</a>
</div>
<p>Save all of the todo items under the <code>"todos-backbone"</code> namespace.</p>
</div>
<div class="content"><div class='highlight'><pre> localStorage: <span class="hljs-keyword">new</span> Backbone.LocalStorage(<span class="hljs-string">"todos-backbone"</span>),</pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-13">¶</a>
</div>
<p>Filter down the list of all todo items that are finished.</p>
</div>
<div class="content"><div class='highlight'><pre> done: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.where({done: <span class="hljs-literal">true</span>});
},</pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-14">¶</a>
</div>
<p>Filter down the list to only todo items that are still not finished.</p>
</div>
<div class="content"><div class='highlight'><pre> remaining: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.where({done: <span class="hljs-literal">false</span>});
},</pre></div></div>
</li>
<li id="section-15">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-15">¶</a>
</div>
<p>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.</p>
</div>
<div class="content"><div class='highlight'><pre> nextOrder: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.length) <span class="hljs-keyword">return</span> <span class="hljs-number">1</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.last().get(<span class="hljs-string">'order'</span>) + <span class="hljs-number">1</span>;
},</pre></div></div>
</li>
<li id="section-16">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-16">¶</a>
</div>
<p>Todos are sorted by their original insertion order.</p>
</div>
<div class="content"><div class='highlight'><pre> comparator: <span class="hljs-string">'order'</span>
});</pre></div></div>
</li>
<li id="section-17">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-17">¶</a>
</div>
<p>Create our global collection of <strong>Todos</strong>.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> Todos = <span class="hljs-keyword">new</span> TodoList;</pre></div></div>
</li>
<li id="section-18">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-18">¶</a>
</div>
<h2 id="todo-item-view">Todo Item View</h2>
</div>
</li>
<li id="section-19">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-19">¶</a>
</div>
</div>
</li>
<li id="section-20">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-20">¶</a>
</div>
<p>The DOM element for a todo item…</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> TodoView = Backbone.View.extend({</pre></div></div>
</li>
<li id="section-21">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-21">¶</a>
</div>
<p>… is a list tag.</p>
</div>
<div class="content"><div class='highlight'><pre> tagName: <span class="hljs-string">"li"</span>,</pre></div></div>
</li>
<li id="section-22">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-22">¶</a>
</div>
<p>Cache the template function for a single item.</p>
</div>
<div class="content"><div class='highlight'><pre> template: _.template($(<span class="hljs-string">'#item-template'</span>).html()),</pre></div></div>
</li>
<li id="section-23">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-23">¶</a>
</div>
<p>The DOM events specific to an item.</p>
</div>
<div class="content"><div class='highlight'><pre> events: {
<span class="hljs-string">"click .toggle"</span> : <span class="hljs-string">"toggleDone"</span>,
<span class="hljs-string">"dblclick .view"</span> : <span class="hljs-string">"edit"</span>,
<span class="hljs-string">"click a.destroy"</span> : <span class="hljs-string">"clear"</span>,
<span class="hljs-string">"keypress .edit"</span> : <span class="hljs-string">"updateOnEnter"</span>,
<span class="hljs-string">"blur .edit"</span> : <span class="hljs-string">"close"</span>
},</pre></div></div>
</li>
<li id="section-24">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-24">¶</a>
</div>
<p>The TodoView listens for changes to its model, re-rendering. Since there’s
a one-to-one correspondence between a <strong>Todo</strong> and a <strong>TodoView</strong> in this
app, we set a direct reference on the model for convenience.</p>
</div>
<div class="content"><div class='highlight'><pre> initialize: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.listenTo(<span class="hljs-keyword">this</span>.model, <span class="hljs-string">'change'</span>, <span class="hljs-keyword">this</span>.render);
<span class="hljs-keyword">this</span>.listenTo(<span class="hljs-keyword">this</span>.model, <span class="hljs-string">'destroy'</span>, <span class="hljs-keyword">this</span>.remove);
},</pre></div></div>
</li>
<li id="section-25">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-25">¶</a>
</div>
<p>Re-render the titles of the todo item.</p>
</div>
<div class="content"><div class='highlight'><pre> render: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.$el.html(<span class="hljs-keyword">this</span>.template(<span class="hljs-keyword">this</span>.model.toJSON()));
<span class="hljs-keyword">this</span>.$el.toggleClass(<span class="hljs-string">'done'</span>, <span class="hljs-keyword">this</span>.model.get(<span class="hljs-string">'done'</span>));
<span class="hljs-keyword">this</span>.input = <span class="hljs-keyword">this</span>.$(<span class="hljs-string">'.edit'</span>);
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
},</pre></div></div>
</li>
<li id="section-26">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-26">¶</a>
</div>
<p>Toggle the <code>"done"</code> state of the model.</p>
</div>
<div class="content"><div class='highlight'><pre> toggleDone: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.model.toggle();
},</pre></div></div>
</li>
<li id="section-27">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-27">¶</a>
</div>
<p>Switch this view into <code>"editing"</code> mode, displaying the input field.</p>
</div>
<div class="content"><div class='highlight'><pre> edit: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.$el.addClass(<span class="hljs-string">"editing"</span>);
<span class="hljs-keyword">this</span>.input.focus();
},</pre></div></div>
</li>
<li id="section-28">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-28">¶</a>
</div>
<p>Close the <code>"editing"</code> mode, saving changes to the todo.</p>
</div>
<div class="content"><div class='highlight'><pre> close: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">var</span> value = <span class="hljs-keyword">this</span>.input.val();
<span class="hljs-keyword">if</span> (!value) {
<span class="hljs-keyword">this</span>.clear();
} <span class="hljs-keyword">else</span> {
<span class="hljs-keyword">this</span>.model.save({title: value});
<span class="hljs-keyword">this</span>.$el.removeClass(<span class="hljs-string">"editing"</span>);
}
},</pre></div></div>
</li>
<li id="section-29">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-29">¶</a>
</div>
<p>If you hit <code>enter</code>, we’re through editing the item.</p>
</div>
<div class="content"><div class='highlight'><pre> updateOnEnter: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(e)</span> </span>{
<span class="hljs-keyword">if</span> (e.keyCode == <span class="hljs-number">13</span>) <span class="hljs-keyword">this</span>.close();
},</pre></div></div>
</li>
<li id="section-30">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-30">¶</a>
</div>
<p>Remove the item, destroy the model.</p>
</div>
<div class="content"><div class='highlight'><pre> clear: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.model.destroy();
}
});</pre></div></div>
</li>
<li id="section-31">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-31">¶</a>
</div>
<h2 id="the-application">The Application</h2>
</div>
</li>
<li id="section-32">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-32">¶</a>
</div>
</div>
</li>
<li id="section-33">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-33">¶</a>
</div>
<p>Our overall <strong>AppView</strong> is the top-level piece of UI.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> AppView = Backbone.View.extend({</pre></div></div>
</li>
<li id="section-34">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-34">¶</a>
</div>
<p>Instead of generating a new element, bind to the existing skeleton of
the App already present in the HTML.</p>
</div>
<div class="content"><div class='highlight'><pre> el: $(<span class="hljs-string">"#todoapp"</span>),</pre></div></div>
</li>
<li id="section-35">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-35">¶</a>
</div>
<p>Our template for the line of statistics at the bottom of the app.</p>
</div>
<div class="content"><div class='highlight'><pre> statsTemplate: _.template($(<span class="hljs-string">'#stats-template'</span>).html()),</pre></div></div>
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<p>Delegated events for creating new items, and clearing completed ones.</p>
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<div class="content"><div class='highlight'><pre> events: {
<span class="hljs-string">"keypress #new-todo"</span>: <span class="hljs-string">"createOnEnter"</span>,
<span class="hljs-string">"click #clear-completed"</span>: <span class="hljs-string">"clearCompleted"</span>,
<span class="hljs-string">"click #toggle-all"</span>: <span class="hljs-string">"toggleAllComplete"</span>
},</pre></div></div>
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<p>At initialization we bind to the relevant events on the <code>Todos</code>
collection, when items are added or changed. Kick things off by
loading any preexisting todos that might be saved in <em>localStorage</em>.</p>
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<div class="content"><div class='highlight'><pre> initialize: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">this</span>.input = <span class="hljs-keyword">this</span>.$(<span class="hljs-string">"#new-todo"</span>);
<span class="hljs-keyword">this</span>.allCheckbox = <span class="hljs-keyword">this</span>.$(<span class="hljs-string">"#toggle-all"</span>)[<span class="hljs-number">0</span>];
<span class="hljs-keyword">this</span>.listenTo(Todos, <span class="hljs-string">'add'</span>, <span class="hljs-keyword">this</span>.addOne);
<span class="hljs-keyword">this</span>.listenTo(Todos, <span class="hljs-string">'reset'</span>, <span class="hljs-keyword">this</span>.addAll);
<span class="hljs-keyword">this</span>.listenTo(Todos, <span class="hljs-string">'all'</span>, <span class="hljs-keyword">this</span>.render);
<span class="hljs-keyword">this</span>.footer = <span class="hljs-keyword">this</span>.$(<span class="hljs-string">'footer'</span>);
<span class="hljs-keyword">this</span>.main = $(<span class="hljs-string">'#main'</span>);
Todos.fetch();
},</pre></div></div>
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<p>Re-rendering the App just means refreshing the statistics — the rest
of the app doesn’t change.</p>
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<div class="content"><div class='highlight'><pre> render: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">var</span> done = Todos.done().length;
<span class="hljs-keyword">var</span> remaining = Todos.remaining().length;
<span class="hljs-keyword">if</span> (Todos.length) {
<span class="hljs-keyword">this</span>.main.show();
<span class="hljs-keyword">this</span>.footer.show();
<span class="hljs-keyword">this</span>.footer.html(<span class="hljs-keyword">this</span>.statsTemplate({done: done, remaining: remaining}));
} <span class="hljs-keyword">else</span> {
<span class="hljs-keyword">this</span>.main.hide();
<span class="hljs-keyword">this</span>.footer.hide();
}
<span class="hljs-keyword">this</span>.allCheckbox.checked = !remaining;
},</pre></div></div>
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<p>Add a single todo item to the list by creating a view for it, and
appending its element to the <code><ul></code>.</p>
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<div class="content"><div class='highlight'><pre> addOne: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(todo)</span> </span>{
<span class="hljs-keyword">var</span> view = <span class="hljs-keyword">new</span> TodoView({model: todo});
<span class="hljs-keyword">this</span>.$(<span class="hljs-string">"#todo-list"</span>).append(view.render().el);
},</pre></div></div>
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<p>Add all items in the <strong>Todos</strong> collection at once.</p>
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<div class="content"><div class='highlight'><pre> addAll: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
Todos.each(<span class="hljs-keyword">this</span>.addOne, <span class="hljs-keyword">this</span>);
},</pre></div></div>
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<p>If you hit return in the main input field, create new <strong>Todo</strong> model,
persisting it to <em>localStorage</em>.</p>
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<div class="content"><div class='highlight'><pre> createOnEnter: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(e)</span> </span>{
<span class="hljs-keyword">if</span> (e.keyCode != <span class="hljs-number">13</span>) <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.input.val()) <span class="hljs-keyword">return</span>;
Todos.create({title: <span class="hljs-keyword">this</span>.input.val()});
<span class="hljs-keyword">this</span>.input.val(<span class="hljs-string">''</span>);
},</pre></div></div>
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<p>Clear all done todo items, destroying their models.</p>
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<div class="content"><div class='highlight'><pre> clearCompleted: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
_.invoke(Todos.done(), <span class="hljs-string">'destroy'</span>);
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
},
toggleAllComplete: <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">var</span> done = <span class="hljs-keyword">this</span>.allCheckbox.checked;
Todos.each(<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-params">(todo)</span> </span>{ todo.save({<span class="hljs-string">'done'</span>: done}); });
}
});</pre></div></div>
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<p>Finally, we kick things off by creating the <strong>App</strong>.</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">var</span> App = <span class="hljs-keyword">new</span> AppView;
});</pre></div></div>
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