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/docs/todos.html

https://github.com/huangbaihua001/backbone
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  1. <!DOCTYPE html>
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  2. 

  3. <html>
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  4. <head>
    5. 

  5.   <title>todos.js</title>
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    10. 

  10. <body>
    11. 

  11.   <div id="container">
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  14.       <ul id="jump_to">
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    16. 

  16.           <a class="large" href="javascript:void(0);">Jump To &hellip;</a>
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  19.           <div id="jump_page">
    20. 

  20.             
    21. 

  21.               
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  22.               <a class="source" href="backbone.localstorage.html">
    23. 

  23.                 backbone.localstorage.js
    24. 

  24.               </a>
    25. 

  25.             
    26. 

  26.               
    27. 

  27.               <a class="source" href="todos.html">
    28. 

  28.                 todos.js
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  29.               </a>
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  30.             
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  31.           </div>
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  32.         </li>
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  33.       </ul>
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  34.     
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  35.     <ul class="sections">
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  36.         
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  37.           <li id="title">
    38. 

  38.               <div class="annotation">
    39. 

  39.                   <h1>todos.js</h1>
    40. 

  40.               </div>
    41. 

  41.           </li>
    42. 

  42.         
    43. 

  43.         
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  44.         
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  45.         <li id="section-1">
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  46.             <div class="annotation">
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  47.               
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  48.               <div class="pilwrap ">
    49. 

  49.                 <a class="pilcrow" href="#section-1">&#182;</a>
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  50.               </div>
    51. 

  51.               <p>An example Backbone application contributed by
    52. 

  52. <a href="http://jgn.me/">J茅r么me Gravel-Niquet</a>. This demo uses a simple
    53. 

  53. <a href="backbone-localstorage.html">LocalStorage adapter</a>
    54. 

  54. to persist Backbone models within your browser.
    55. 

  55. 

  56. </p>
    57. 

  57. <p>Load the application once the DOM is ready, using <code>jQuery.ready</code>:
    58. 

  58. </p>
    59. 

  59. 

  60.             </div>
    61. 

  61.             
    62. 

  62.             <div class="content"><div class='highlight'><pre>$(<span class="keyword">function</span>(){</pre></div></div>
    63. 

  63.             
    64. 

  64.         </li>
    65. 

  65.         
    66. 

  66.         
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  67.         <li id="section-2">
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  68.             <div class="annotation">
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  69.               
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  70.               <div class="pilwrap for-h2">
    71. 

  71.                 <a class="pilcrow" href="#section-2">&#182;</a>
    72. 

  72.               </div>
    73. 

  73.               <h2>Todo Model</h2>
    74. 

  74. 

  75.             </div>
    76. 

  76.             
    77. 

  77.         </li>
    78. 

  78.         
    79. 

  79.         
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  80.         <li id="section-3">
    81. 

  81.             <div class="annotation">
    82. 

  82.               
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  83.               <div class="pilwrap ">
    84. 

  84.                 <a class="pilcrow" href="#section-3">&#182;</a>
    85. 

  85.               </div>
    86. 

  86.               <p>Our basic <strong>Todo</strong> model has <code>title</code>, <code>order</code>, and <code>done</code> attributes.
    87. 

  87. </p>
    88. 

  88. 

  89.             </div>
    90. 

  90.             
    91. 

  91.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> Todo = Backbone.Model.extend({</pre></div></div>
    92. 

  92.             
    93. 

  93.         </li>
    94. 

  94.         
    95. 

  95.         
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  96.         <li id="section-4">
    97. 

  97.             <div class="annotation">
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  98.               
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  99.               <div class="pilwrap ">
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  100.                 <a class="pilcrow" href="#section-4">&#182;</a>
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  101.               </div>
    102. 

  102.               <p>Default attributes for the todo item.
    103. 

  103. </p>
    104. 

  104. 

  105.             </div>
    106. 

  106.             
    107. 

  107.             <div class="content"><div class='highlight'><pre>    defaults: <span class="keyword">function</span>() {
    108. 

  108.       <span class="keyword">return</span> {
    109. 

  109.         title: <span class="string">"empty todo..."</span>,
    110. 

  110.         order: Todos.nextOrder(),
    111. 

  111.         done: <span class="literal">false</span>
    112. 

  112.       };
    113. 

  113.     },</pre></div></div>
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  114.             
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  115.         </li>
    116. 

  116.         
    117. 

  117.         
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  118.         <li id="section-5">
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  119.             <div class="annotation">
    120. 

  120.               
    121. 

  121.               <div class="pilwrap ">
    122. 

  122.                 <a class="pilcrow" href="#section-5">&#182;</a>
    123. 

  123.               </div>
    124. 

  124.               <p>Toggle the <code>done</code> state of this todo item.
    125. 

  125. </p>
    126. 

  126. 

  127.             </div>
    128. 

  128.             
    129. 

  129.             <div class="content"><div class='highlight'><pre>    toggle: <span class="keyword">function</span>() {
    130. 

  130.       <span class="keyword">this</span>.save({done: !<span class="keyword">this</span>.get(<span class="string">"done"</span>)});
    131. 

  131.     }
    132. 

  132. 

  133.   });</pre></div></div>
    134. 

  134.             
    135. 

  135.         </li>
    136. 

  136.         
    137. 

  137.         
    138. 

  138.         <li id="section-6">
    139. 

  139.             <div class="annotation">
    140. 

  140.               
    141. 

  141.               <div class="pilwrap for-h2">
    142. 

  142.                 <a class="pilcrow" href="#section-6">&#182;</a>
    143. 

  143.               </div>
    144. 

  144.               <h2>Todo Collection</h2>
    145. 

  145. 

  146.             </div>
    147. 

  147.             
    148. 

  148.         </li>
    149. 

  149.         
    150. 

  150.         
    151. 

  151.         <li id="section-7">
    152. 

  152.             <div class="annotation">
    153. 

  153.               
    154. 

  154.               <div class="pilwrap ">
    155. 

  155.                 <a class="pilcrow" href="#section-7">&#182;</a>
    156. 

  156.               </div>
    157. 

  157.               <p>The collection of todos is backed by <em>localStorage</em> instead of a remote
    158. 

  158. server.
    159. 

  159. </p>
    160. 

  160. 

  161.             </div>
    162. 

  162.             
    163. 

  163.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> TodoList = Backbone.Collection.extend({</pre></div></div>
    164. 

  164.             
    165. 

  165.         </li>
    166. 

  166.         
    167. 

  167.         
    168. 

  168.         <li id="section-8">
    169. 

  169.             <div class="annotation">
    170. 

  170.               
    171. 

  171.               <div class="pilwrap ">
    172. 

  172.                 <a class="pilcrow" href="#section-8">&#182;</a>
    173. 

  173.               </div>
    174. 

  174.               <p>Reference to this collection&#39;s model.
    175. 

  175. </p>
    176. 

  176. 

  177.             </div>
    178. 

  178.             
    179. 

  179.             <div class="content"><div class='highlight'><pre>    model: Todo,</pre></div></div>
    180. 

  180.             
    181. 

  181.         </li>
    182. 

  182.         
    183. 

  183.         
    184. 

  184.         <li id="section-9">
    185. 

  185.             <div class="annotation">
    186. 

  186.               
    187. 

  187.               <div class="pilwrap ">
    188. 

  188.                 <a class="pilcrow" href="#section-9">&#182;</a>
    189. 

  189.               </div>
    190. 

  190.               <p>Save all of the todo items under the <code>&quot;todos-backbone&quot;</code> namespace.
    191. 

  191. </p>
    192. 

  192. 

  193.             </div>
    194. 

  194.             
    195. 

  195.             <div class="content"><div class='highlight'><pre>    localStorage: <span class="keyword">new</span> Backbone.LocalStorage(<span class="string">"todos-backbone"</span>),</pre></div></div>
    196. 

  196.             
    197. 

  197.         </li>
    198. 

  198.         
    199. 

  199.         
    200. 

  200.         <li id="section-10">
    201. 

  201.             <div class="annotation">
    202. 

  202.               
    203. 

  203.               <div class="pilwrap ">
    204. 

  204.                 <a class="pilcrow" href="#section-10">&#182;</a>
    205. 

  205.               </div>
    206. 

  206.               <p>Filter down the list of all todo items that are finished.
    207. 

  207. </p>
    208. 

  208. 

  209.             </div>
    210. 

  210.             
    211. 

  211.             <div class="content"><div class='highlight'><pre>    done: <span class="keyword">function</span>() {
    212. 

  212.       <span class="keyword">return</span> <span class="keyword">this</span>.where({done: <span class="literal">true</span>});
    213. 

  213.     },</pre></div></div>
    214. 

  214.             
    215. 

  215.         </li>
    216. 

  216.         
    217. 

  217.         
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  218.         <li id="section-11">
    219. 

  219.             <div class="annotation">
    220. 

  220.               
    221. 

  221.               <div class="pilwrap ">
    222. 

  222.                 <a class="pilcrow" href="#section-11">&#182;</a>
    223. 

  223.               </div>
    224. 

  224.               <p>Filter down the list to only todo items that are still not finished.
    225. 

  225. </p>
    226. 

  226. 

  227.             </div>
    228. 

  228.             
    229. 

  229.             <div class="content"><div class='highlight'><pre>    remaining: <span class="keyword">function</span>() {
    230. 

  230.       <span class="keyword">return</span> <span class="keyword">this</span>.without.apply(<span class="keyword">this</span>, <span class="keyword">this</span>.done());
    231. 

  231.     },</pre></div></div>
    232. 

  232.             
    233. 

  233.         </li>
    234. 

  234.         
    235. 

  235.         
    236. 

  236.         <li id="section-12">
    237. 

  237.             <div class="annotation">
    238. 

  238.               
    239. 

  239.               <div class="pilwrap ">
    240. 

  240.                 <a class="pilcrow" href="#section-12">&#182;</a>
    241. 

  241.               </div>
    242. 

  242.               <p>We keep the Todos in sequential order, despite being saved by unordered
    243. 

  243. GUID in the database. This generates the next order number for new items.
    244. 

  244. </p>
    245. 

  245. 

  246.             </div>
    247. 

  247.             
    248. 

  248.             <div class="content"><div class='highlight'><pre>    nextOrder: <span class="keyword">function</span>() {
    249. 

  249.       <span class="keyword">if</span> (!<span class="keyword">this</span>.length) <span class="keyword">return</span> <span class="number">1</span>;
    250. 

  250.       <span class="keyword">return</span> <span class="keyword">this</span>.last().get(<span class="string">'order'</span>) + <span class="number">1</span>;
    251. 

  251.     },</pre></div></div>
    252. 

  252.             
    253. 

  253.         </li>
    254. 

  254.         
    255. 

  255.         
    256. 

  256.         <li id="section-13">
    257. 

  257.             <div class="annotation">
    258. 

  258.               
    259. 

  259.               <div class="pilwrap ">
    260. 

  260.                 <a class="pilcrow" href="#section-13">&#182;</a>
    261. 

  261.               </div>
    262. 

  262.               <p>Todos are sorted by their original insertion order.
    263. 

  263. </p>
    264. 

  264. 

  265.             </div>
    266. 

  266.             
    267. 

  267.             <div class="content"><div class='highlight'><pre>    comparator: <span class="string">'order'</span>
    268. 

  268. 

  269.   });</pre></div></div>
    270. 

  270.             
    271. 

  271.         </li>
    272. 

  272.         
    273. 

  273.         
    274. 

  274.         <li id="section-14">
    275. 

  275.             <div class="annotation">
    276. 

  276.               
    277. 

  277.               <div class="pilwrap ">
    278. 

  278.                 <a class="pilcrow" href="#section-14">&#182;</a>
    279. 

  279.               </div>
    280. 

  280.               <p>Create our global collection of <strong>Todos</strong>.
    281. 

  281. </p>
    282. 

  282. 

  283.             </div>
    284. 

  284.             
    285. 

  285.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> Todos = <span class="keyword">new</span> TodoList;</pre></div></div>
    286. 

  286.             
    287. 

  287.         </li>
    288. 

  288.         
    289. 

  289.         
    290. 

  290.         <li id="section-15">
    291. 

  291.             <div class="annotation">
    292. 

  292.               
    293. 

  293.               <div class="pilwrap for-h2">
    294. 

  294.                 <a class="pilcrow" href="#section-15">&#182;</a>
    295. 

  295.               </div>
    296. 

  296.               <h2>Todo Item View</h2>
    297. 

  297. 

  298.             </div>
    299. 

  299.             
    300. 

  300.         </li>
    301. 

  301.         
    302. 

  302.         
    303. 

  303.         <li id="section-16">
    304. 

  304.             <div class="annotation">
    305. 

  305.               
    306. 

  306.               <div class="pilwrap ">
    307. 

  307.                 <a class="pilcrow" href="#section-16">&#182;</a>
    308. 

  308.               </div>
    309. 

  309.               <p>The DOM element for a todo item...
    310. 

  310. </p>
    311. 

  311. 

  312.             </div>
    313. 

  313.             
    314. 

  314.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> TodoView = Backbone.View.extend({</pre></div></div>
    315. 

  315.             
    316. 

  316.         </li>
    317. 

  317.         
    318. 

  318.         
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  319.         <li id="section-17">
    320. 

  320.             <div class="annotation">
    321. 

  321.               
    322. 

  322.               <div class="pilwrap ">
    323. 

  323.                 <a class="pilcrow" href="#section-17">&#182;</a>
    324. 

  324.               </div>
    325. 

  325.               <p>... is a list tag.
    326. 

  326. </p>
    327. 

  327. 

  328.             </div>
    329. 

  329.             
    330. 

  330.             <div class="content"><div class='highlight'><pre>    tagName:  <span class="string">"li"</span>,</pre></div></div>
    331. 

  331.             
    332. 

  332.         </li>
    333. 

  333.         
    334. 

  334.         
    335. 

  335.         <li id="section-18">
    336. 

  336.             <div class="annotation">
    337. 

  337.               
    338. 

  338.               <div class="pilwrap ">
    339. 

  339.                 <a class="pilcrow" href="#section-18">&#182;</a>
    340. 

  340.               </div>
    341. 

  341.               <p>Cache the template function for a single item.
    342. 

  342. </p>
    343. 

  343. 

  344.             </div>
    345. 

  345.             
    346. 

  346.             <div class="content"><div class='highlight'><pre>    template: _.template($(<span class="string">'#item-template'</span>).html()),</pre></div></div>
    347. 

  347.             
    348. 

  348.         </li>
    349. 

  349.         
    350. 

  350.         
    351. 

  351.         <li id="section-19">
    352. 

  352.             <div class="annotation">
    353. 

  353.               
    354. 

  354.               <div class="pilwrap ">
    355. 

  355.                 <a class="pilcrow" href="#section-19">&#182;</a>
    356. 

  356.               </div>
    357. 

  357.               <p>The DOM events specific to an item.
    358. 

  358. </p>
    359. 

  359. 

  360.             </div>
    361. 

  361.             
    362. 

  362.             <div class="content"><div class='highlight'><pre>    events: {
    363. 

  363.       <span class="string">"click .toggle"</span>   : <span class="string">"toggleDone"</span>,
    364. 

  364.       <span class="string">"dblclick .view"</span>  : <span class="string">"edit"</span>,
    365. 

  365.       <span class="string">"click a.destroy"</span> : <span class="string">"clear"</span>,
    366. 

  366.       <span class="string">"keypress .edit"</span>  : <span class="string">"updateOnEnter"</span>,
    367. 

  367.       <span class="string">"blur .edit"</span>      : <span class="string">"close"</span>
    368. 

  368.     },</pre></div></div>
    369. 

  369.             
    370. 

  370.         </li>
    371. 

  371.         
    372. 

  372.         
    373. 

  373.         <li id="section-20">
    374. 

  374.             <div class="annotation">
    375. 

  375.               
    376. 

  376.               <div class="pilwrap ">
    377. 

  377.                 <a class="pilcrow" href="#section-20">&#182;</a>
    378. 

  378.               </div>
    379. 

  379.               <p>The TodoView listens for changes to its model, re-rendering. Since there&#39;s
    380. 

  380. a one-to-one correspondence between a <strong>Todo</strong> and a <strong>TodoView</strong> in this
    381. 

  381. app, we set a direct reference on the model for convenience.
    382. 

  382. </p>
    383. 

  383. 

  384.             </div>
    385. 

  385.             
    386. 

  386.             <div class="content"><div class='highlight'><pre>    initialize: <span class="keyword">function</span>() {
    387. 

  387.       <span class="keyword">this</span>.listenTo(<span class="keyword">this</span>.model, <span class="string">'change'</span>, <span class="keyword">this</span>.render);
    388. 

  388.       <span class="keyword">this</span>.listenTo(<span class="keyword">this</span>.model, <span class="string">'destroy'</span>, <span class="keyword">this</span>.remove);
    389. 

  389.     },</pre></div></div>
    390. 

  390.             
    391. 

  391.         </li>
    392. 

  392.         
    393. 

  393.         
    394. 

  394.         <li id="section-21">
    395. 

  395.             <div class="annotation">
    396. 

  396.               
    397. 

  397.               <div class="pilwrap ">
    398. 

  398.                 <a class="pilcrow" href="#section-21">&#182;</a>
    399. 

  399.               </div>
    400. 

  400.               <p>Re-render the titles of the todo item.
    401. 

  401. </p>
    402. 

  402. 

  403.             </div>
    404. 

  404.             
    405. 

  405.             <div class="content"><div class='highlight'><pre>    render: <span class="keyword">function</span>() {
    406. 

  406.       <span class="keyword">this</span>.$el.html(<span class="keyword">this</span>.template(<span class="keyword">this</span>.model.toJSON()));
    407. 

  407.       <span class="keyword">this</span>.$el.toggleClass(<span class="string">'done'</span>, <span class="keyword">this</span>.model.get(<span class="string">'done'</span>));
    408. 

  408.       <span class="keyword">this</span>.input = <span class="keyword">this</span>.$(<span class="string">'.edit'</span>);
    409. 

  409.       <span class="keyword">return</span> <span class="keyword">this</span>;
    410. 

  410.     },</pre></div></div>
    411. 

  411.             
    412. 

  412.         </li>
    413. 

  413.         
    414. 

  414.         
    415. 

  415.         <li id="section-22">
    416. 

  416.             <div class="annotation">
    417. 

  417.               
    418. 

  418.               <div class="pilwrap ">
    419. 

  419.                 <a class="pilcrow" href="#section-22">&#182;</a>
    420. 

  420.               </div>
    421. 

  421.               <p>Toggle the <code>&quot;done&quot;</code> state of the model.
    422. 

  422. </p>
    423. 

  423. 

  424.             </div>
    425. 

  425.             
    426. 

  426.             <div class="content"><div class='highlight'><pre>    toggleDone: <span class="keyword">function</span>() {
    427. 

  427.       <span class="keyword">this</span>.model.toggle();
    428. 

  428.     },</pre></div></div>
    429. 

  429.             
    430. 

  430.         </li>
    431. 

  431.         
    432. 

  432.         
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  433.         <li id="section-23">
    434. 

  434.             <div class="annotation">
    435. 

  435.               
    436. 

  436.               <div class="pilwrap ">
    437. 

  437.                 <a class="pilcrow" href="#section-23">&#182;</a>
    438. 

  438.               </div>
    439. 

  439.               <p>Switch this view into <code>&quot;editing&quot;</code> mode, displaying the input field.
    440. 

  440. </p>
    441. 

  441. 

  442.             </div>
    443. 

  443.             
    444. 

  444.             <div class="content"><div class='highlight'><pre>    edit: <span class="keyword">function</span>() {
    445. 

  445.       <span class="keyword">this</span>.$el.addClass(<span class="string">"editing"</span>);
    446. 

  446.       <span class="keyword">this</span>.input.focus();
    447. 

  447.     },</pre></div></div>
    448. 

  448.             
    449. 

  449.         </li>
    450. 

  450.         
    451. 

  451.         
    452. 

  452.         <li id="section-24">
    453. 

  453.             <div class="annotation">
    454. 

  454.               
    455. 

  455.               <div class="pilwrap ">
    456. 

  456.                 <a class="pilcrow" href="#section-24">&#182;</a>
    457. 

  457.               </div>
    458. 

  458.               <p>Close the <code>&quot;editing&quot;</code> mode, saving changes to the todo.
    459. 

  459. </p>
    460. 

  460. 

  461.             </div>
    462. 

  462.             
    463. 

  463.             <div class="content"><div class='highlight'><pre>    close: <span class="keyword">function</span>() {
    464. 

  464.       <span class="keyword">var</span> value = <span class="keyword">this</span>.input.val();
    465. 

  465.       <span class="keyword">if</span> (!value) {
    466. 

  466.         <span class="keyword">this</span>.clear();
    467. 

  467.       } <span class="keyword">else</span> {
    468. 

  468.         <span class="keyword">this</span>.model.save({title: value});
    469. 

  469.         <span class="keyword">this</span>.$el.removeClass(<span class="string">"editing"</span>);
    470. 

  470.       }
    471. 

  471.     },</pre></div></div>
    472. 

  472.             
    473. 

  473.         </li>
    474. 

  474.         
    475. 

  475.         
    476. 

  476.         <li id="section-25">
    477. 

  477.             <div class="annotation">
    478. 

  478.               
    479. 

  479.               <div class="pilwrap ">
    480. 

  480.                 <a class="pilcrow" href="#section-25">&#182;</a>
    481. 

  481.               </div>
    482. 

  482.               <p>If you hit <code>enter</code>, we&#39;re through editing the item.
    483. 

  483. </p>
    484. 

  484. 

  485.             </div>
    486. 

  486.             
    487. 

  487.             <div class="content"><div class='highlight'><pre>    updateOnEnter: <span class="keyword">function</span>(e) {
    488. 

  488.       <span class="keyword">if</span> (e.keyCode == <span class="number">13</span>) <span class="keyword">this</span>.close();
    489. 

  489.     },</pre></div></div>
    490. 

  490.             
    491. 

  491.         </li>
    492. 

  492.         
    493. 

  493.         
    494. 

  494.         <li id="section-26">
    495. 

  495.             <div class="annotation">
    496. 

  496.               
    497. 

  497.               <div class="pilwrap ">
    498. 

  498.                 <a class="pilcrow" href="#section-26">&#182;</a>
    499. 

  499.               </div>
    500. 

  500.               <p>Remove the item, destroy the model.
    501. 

  501. </p>
    502. 

  502. 

  503.             </div>
    504. 

  504.             
    505. 

  505.             <div class="content"><div class='highlight'><pre>    clear: <span class="keyword">function</span>() {
    506. 

  506.       <span class="keyword">this</span>.model.destroy();
    507. 

  507.     }
    508. 

  508. 

  509.   });</pre></div></div>
    510. 

  510.             
    511. 

  511.         </li>
    512. 

  512.         
    513. 

  513.         
    514. 

  514.         <li id="section-27">
    515. 

  515.             <div class="annotation">
    516. 

  516.               
    517. 

  517.               <div class="pilwrap for-h2">
    518. 

  518.                 <a class="pilcrow" href="#section-27">&#182;</a>
    519. 

  519.               </div>
    520. 

  520.               <h2>The Application</h2>
    521. 

  521. 

  522.             </div>
    523. 

  523.             
    524. 

  524.         </li>
    525. 

  525.         
    526. 

  526.         
    527. 

  527.         <li id="section-28">
    528. 

  528.             <div class="annotation">
    529. 

  529.               
    530. 

  530.               <div class="pilwrap ">
    531. 

  531.                 <a class="pilcrow" href="#section-28">&#182;</a>
    532. 

  532.               </div>
    533. 

  533.               <p>Our overall <strong>AppView</strong> is the top-level piece of UI.
    534. 

  534. </p>
    535. 

  535. 

  536.             </div>
    537. 

  537.             
    538. 

  538.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> AppView = Backbone.View.extend({</pre></div></div>
    539. 

  539.             
    540. 

  540.         </li>
    541. 

  541.         
    542. 

  542.         
    543. 

  543.         <li id="section-29">
    544. 

  544.             <div class="annotation">
    545. 

  545.               
    546. 

  546.               <div class="pilwrap ">
    547. 

  547.                 <a class="pilcrow" href="#section-29">&#182;</a>
    548. 

  548.               </div>
    549. 

  549.               <p>Instead of generating a new element, bind to the existing skeleton of
    550. 

  550. the App already present in the HTML.
    551. 

  551. </p>
    552. 

  552. 

  553.             </div>
    554. 

  554.             
    555. 

  555.             <div class="content"><div class='highlight'><pre>    el: $(<span class="string">"#todoapp"</span>),</pre></div></div>
    556. 

  556.             
    557. 

  557.         </li>
    558. 

  558.         
    559. 

  559.         
    560. 

  560.         <li id="section-30">
    561. 

  561.             <div class="annotation">
    562. 

  562.               
    563. 

  563.               <div class="pilwrap ">
    564. 

  564.                 <a class="pilcrow" href="#section-30">&#182;</a>
    565. 

  565.               </div>
    566. 

  566.               <p>Our template for the line of statistics at the bottom of the app.
    567. 

  567. </p>
    568. 

  568. 

  569.             </div>
    570. 

  570.             
    571. 

  571.             <div class="content"><div class='highlight'><pre>    statsTemplate: _.template($(<span class="string">'#stats-template'</span>).html()),</pre></div></div>
    572. 

  572.             
    573. 

  573.         </li>
    574. 

  574.         
    575. 

  575.         
    576. 

  576.         <li id="section-31">
    577. 

  577.             <div class="annotation">
    578. 

  578.               
    579. 

  579.               <div class="pilwrap ">
    580. 

  580.                 <a class="pilcrow" href="#section-31">&#182;</a>
    581. 

  581.               </div>
    582. 

  582.               <p>Delegated events for creating new items, and clearing completed ones.
    583. 

  583. </p>
    584. 

  584. 

  585.             </div>
    586. 

  586.             
    587. 

  587.             <div class="content"><div class='highlight'><pre>    events: {
    588. 

  588.       <span class="string">"keypress #new-todo"</span>:  <span class="string">"createOnEnter"</span>,
    589. 

  589.       <span class="string">"click #clear-completed"</span>: <span class="string">"clearCompleted"</span>,
    590. 

  590.       <span class="string">"click #toggle-all"</span>: <span class="string">"toggleAllComplete"</span>
    591. 

  591.     },</pre></div></div>
    592. 

  592.             
    593. 

  593.         </li>
    594. 

  594.         
    595. 

  595.         
    596. 

  596.         <li id="section-32">
    597. 

  597.             <div class="annotation">
    598. 

  598.               
    599. 

  599.               <div class="pilwrap ">
    600. 

  600.                 <a class="pilcrow" href="#section-32">&#182;</a>
    601. 

  601.               </div>
    602. 

  602.               <p>At initialization we bind to the relevant events on the <code>Todos</code>
    603. 

  603. collection, when items are added or changed. Kick things off by
    604. 

  604. loading any preexisting todos that might be saved in <em>localStorage</em>.
    605. 

  605. </p>
    606. 

  606. 

  607.             </div>
    608. 

  608.             
    609. 

  609.             <div class="content"><div class='highlight'><pre>    initialize: <span class="keyword">function</span>() {
    610. 

  610. 

  611.       <span class="keyword">this</span>.input = <span class="keyword">this</span>.$(<span class="string">"#new-todo"</span>);
    612. 

  612.       <span class="keyword">this</span>.allCheckbox = <span class="keyword">this</span>.$(<span class="string">"#toggle-all"</span>)[<span class="number">0</span>];
    613. 

  613. 

  614.       <span class="keyword">this</span>.listenTo(Todos, <span class="string">'add'</span>, <span class="keyword">this</span>.addOne);
    615. 

  615.       <span class="keyword">this</span>.listenTo(Todos, <span class="string">'reset'</span>, <span class="keyword">this</span>.addAll);
    616. 

  616.       <span class="keyword">this</span>.listenTo(Todos, <span class="string">'all'</span>, <span class="keyword">this</span>.render);
    617. 

  617. 

  618.       <span class="keyword">this</span>.footer = <span class="keyword">this</span>.$(<span class="string">'footer'</span>);
    619. 

  619.       <span class="keyword">this</span>.main = $(<span class="string">'#main'</span>);
    620. 

  620. 

  621.       Todos.fetch();
    622. 

  622.     },</pre></div></div>
    623. 

  623.             
    624. 

  624.         </li>
    625. 

  625.         
    626. 

  626.         
    627. 

  627.         <li id="section-33">
    628. 

  628.             <div class="annotation">
    629. 

  629.               
    630. 

  630.               <div class="pilwrap ">
    631. 

  631.                 <a class="pilcrow" href="#section-33">&#182;</a>
    632. 

  632.               </div>
    633. 

  633.               <p>Re-rendering the App just means refreshing the statistics -- the rest
    634. 

  634. of the app doesn&#39;t change.
    635. 

  635. </p>
    636. 

  636. 

  637.             </div>
    638. 

  638.             
    639. 

  639.             <div class="content"><div class='highlight'><pre>    render: <span class="keyword">function</span>() {
    640. 

  640.       <span class="keyword">var</span> done = Todos.done().length;
    641. 

  641.       <span class="keyword">var</span> remaining = Todos.remaining().length;
    642. 

  642. 

  643.       <span class="keyword">if</span> (Todos.length) {
    644. 

  644.         <span class="keyword">this</span>.main.show();
    645. 

  645.         <span class="keyword">this</span>.footer.show();
    646. 

  646.         <span class="keyword">this</span>.footer.html(<span class="keyword">this</span>.statsTemplate({done: done, remaining: remaining}));
    647. 

  647.       } <span class="keyword">else</span> {
    648. 

  648.         <span class="keyword">this</span>.main.hide();
    649. 

  649.         <span class="keyword">this</span>.footer.hide();
    650. 

  650.       }
    651. 

  651. 

  652.       <span class="keyword">this</span>.allCheckbox.checked = !remaining;
    653. 

  653.     },</pre></div></div>
    654. 

  654.             
    655. 

  655.         </li>
    656. 

  656.         
    657. 

  657.         
    658. 

  658.         <li id="section-34">
    659. 

  659.             <div class="annotation">
    660. 

  660.               
    661. 

  661.               <div class="pilwrap ">
    662. 

  662.                 <a class="pilcrow" href="#section-34">&#182;</a>
    663. 

  663.               </div>
    664. 

  664.               <p>Add a single todo item to the list by creating a view for it, and
    665. 

  665. appending its element to the <code>&lt;ul&gt;</code>.
    666. 

  666. </p>
    667. 

  667. 

  668.             </div>
    669. 

  669.             
    670. 

  670.             <div class="content"><div class='highlight'><pre>    addOne: <span class="keyword">function</span>(todo) {
    671. 

  671.       <span class="keyword">var</span> view = <span class="keyword">new</span> TodoView({model: todo});
    672. 

  672.       <span class="keyword">this</span>.$(<span class="string">"#todo-list"</span>).append(view.render().el);
    673. 

  673.     },</pre></div></div>
    674. 

  674.             
    675. 

  675.         </li>
    676. 

  676.         
    677. 

  677.         
    678. 

  678.         <li id="section-35">
    679. 

  679.             <div class="annotation">
    680. 

  680.               
    681. 

  681.               <div class="pilwrap ">
    682. 

  682.                 <a class="pilcrow" href="#section-35">&#182;</a>
    683. 

  683.               </div>
    684. 

  684.               <p>Add all items in the <strong>Todos</strong> collection at once.
    685. 

  685. </p>
    686. 

  686. 

  687.             </div>
    688. 

  688.             
    689. 

  689.             <div class="content"><div class='highlight'><pre>    addAll: <span class="keyword">function</span>() {
    690. 

  690.       Todos.each(<span class="keyword">this</span>.addOne, <span class="keyword">this</span>);
    691. 

  691.     },</pre></div></div>
    692. 

  692.             
    693. 

  693.         </li>
    694. 

  694.         
    695. 

  695.         
    696. 

  696.         <li id="section-36">
    697. 

  697.             <div class="annotation">
    698. 

  698.               
    699. 

  699.               <div class="pilwrap ">
    700. 

  700.                 <a class="pilcrow" href="#section-36">&#182;</a>
    701. 

  701.               </div>
    702. 

  702.               <p>If you hit return in the main input field, create new <strong>Todo</strong> model,
    703. 

  703. persisting it to <em>localStorage</em>.
    704. 

  704. </p>
    705. 

  705. 

  706.             </div>
    707. 

  707.             
    708. 

  708.             <div class="content"><div class='highlight'><pre>    createOnEnter: <span class="keyword">function</span>(e) {
    709. 

  709.       <span class="keyword">if</span> (e.keyCode != <span class="number">13</span>) <span class="keyword">return</span>;
    710. 

  710.       <span class="keyword">if</span> (!<span class="keyword">this</span>.input.val()) <span class="keyword">return</span>;
    711. 

  711. 

  712.       Todos.create({title: <span class="keyword">this</span>.input.val()});
    713. 

  713.       <span class="keyword">this</span>.input.val(<span class="string">''</span>);
    714. 

  714.     },</pre></div></div>
    715. 

  715.             
    716. 

  716.         </li>
    717. 

  717.         
    718. 

  718.         
    719. 

  719.         <li id="section-37">
    720. 

  720.             <div class="annotation">
    721. 

  721.               
    722. 

  722.               <div class="pilwrap ">
    723. 

  723.                 <a class="pilcrow" href="#section-37">&#182;</a>
    724. 

  724.               </div>
    725. 

  725.               <p>Clear all done todo items, destroying their models.
    726. 

  726. </p>
    727. 

  727. 

  728.             </div>
    729. 

  729.             
    730. 

  730.             <div class="content"><div class='highlight'><pre>    clearCompleted: <span class="keyword">function</span>() {
    731. 

  731.       _.invoke(Todos.done(), <span class="string">'destroy'</span>);
    732. 

  732.       <span class="keyword">return</span> <span class="literal">false</span>;
    733. 

  733.     },
    734. 

  734. 

  735.     toggleAllComplete: <span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span>
    736. 

  736.       <span class="keyword">var</span> done = <span class="keyword">this</span>.allCheckbox.checked;
    737. 

  737.       Todos.each(<span class="function"><span class="keyword">function</span> <span class="params">(todo)</span> {</span> todo.save({<span class="string">'done'</span>: done}); });
    738. 

  738.     }
    739. 

  739. 

  740.   });</pre></div></div>
    741. 

  741.             
    742. 

  742.         </li>
    743. 

  743.         
    744. 

  744.         
    745. 

  745.         <li id="section-38">
    746. 

  746.             <div class="annotation">
    747. 

  747.               
    748. 

  748.               <div class="pilwrap ">
    749. 

  749.                 <a class="pilcrow" href="#section-38">&#182;</a>
    750. 

  750.               </div>
    751. 

  751.               <p>Finally, we kick things off by creating the <strong>App</strong>.
    752. 

  752. </p>
    753. 

  753. 

  754.             </div>
    755. 

  755.             
    756. 

  756.             <div class="content"><div class='highlight'><pre>  <span class="keyword">var</span> App = <span class="keyword">new</span> AppView;
    757. 

  757. 

  758. });</pre></div></div>
    759. 

  759.             
    760. 

  760.         </li>
    761. 

  761.         
    762. 

  762.     </ul>
    763. 

  763.   </div>
    764. 

  764. </body>
    765. 

  765. </html>
    766. 

  766.