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  23.                 backbone.localstorage.js
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    34. 

  34.     
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    36. 

  36.         
    37. 

  37.           <li id="title">
    38. 

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

  39.                   <h1>backbone.localstorage.js</h1>
    40. 

  40.               </div>
    41. 

  41.           </li>
    42. 

  42.         
    43. 

  43.         
    44. 

  44.         
    45. 

  45.         <li id="section-1">
    46. 

  46.             <div class="annotation">
    47. 

  47.               
    48. 

  48.               <div class="pilwrap ">
    49. 

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

  50.               </div>
    51. 

  51.               
    52. 

  52.             </div>
    53. 

  53.             
    54. 

  54.             <div class="content"><div class='highlight'><pre><span class="comment">/**
    55. 

  55.  * Backbone localStorage Adapter
    56. 

  56.  * Version 1.1.0
    57. 

  57.  *
    58. 

  58.  * https://github.com/jeromegn/Backbone.localStorage
    59. 

  59.  */</span>
    60. 

  60. (<span class="function"><span class="keyword">function</span> <span class="params">(root, factory)</span> {</span>
    61. 

  61.    <span class="keyword">if</span> (<span class="keyword">typeof</span> define === <span class="string">"function"</span> &amp;&amp; define.amd) {</pre></div></div>
    62. 

  62.             
    63. 

  63.         </li>
    64. 

  64.         
    65. 

  65.         
    66. 

  66.         <li id="section-2">
    67. 

  67.             <div class="annotation">
    68. 

  68.               
    69. 

  69.               <div class="pilwrap ">
    70. 

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

  71.               </div>
    72. 

  72.               <p>AMD. Register as an anonymous module.
    73. 

  73. </p>
    74. 

  74. 

  75.             </div>
    76. 

  76.             
    77. 

  77.             <div class="content"><div class='highlight'><pre>      define([<span class="string">"underscore"</span>,<span class="string">"backbone"</span>], <span class="keyword">function</span>(_, Backbone) {</pre></div></div>
    78. 

  78.             
    79. 

  79.         </li>
    80. 

  80.         
    81. 

  81.         
    82. 

  82.         <li id="section-3">
    83. 

  83.             <div class="annotation">
    84. 

  84.               
    85. 

  85.               <div class="pilwrap ">
    86. 

  86.                 <a class="pilcrow" href="#section-3">&#182;</a>
    87. 

  87.               </div>
    88. 

  88.               <p>Use global variables if the locals are undefined.
    89. 

  89. </p>
    90. 

  90. 

  91.             </div>
    92. 

  92.             
    93. 

  93.             <div class="content"><div class='highlight'><pre>        <span class="keyword">return</span> factory(_ || root._, Backbone || root.Backbone);
    94. 

  94.       });
    95. 

  95.    } <span class="keyword">else</span> {</pre></div></div>
    96. 

  96.             
    97. 

  97.         </li>
    98. 

  98.         
    99. 

  99.         
    100. 

  100.         <li id="section-4">
    101. 

  101.             <div class="annotation">
    102. 

  102.               
    103. 

  103.               <div class="pilwrap ">
    104. 

  104.                 <a class="pilcrow" href="#section-4">&#182;</a>
    105. 

  105.               </div>
    106. 

  106.               <p>RequireJS isn&#39;t being used. Assume underscore and backbone are loaded in <script> tags
    107. 

  107. </p>
    108. 

  108. 

  109.             </div>
    110. 

  110.             
    111. 

  111.             <div class="content"><div class='highlight'><pre>      factory(_, Backbone);
    112. 

  112.    }
    113. 

  113. }(<span class="keyword">this</span>, <span class="keyword">function</span>(_, Backbone) {</pre></div></div>
    114. 

  114.             
    115. 

  115.         </li>
    116. 

  116.         
    117. 

  117.         
    118. 

  118.         <li id="section-5">
    119. 

  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>A simple module to replace <code>Backbone.sync</code> with <em>localStorage</em>-based
    125. 

  125. persistence. Models are given GUIDS, and saved into a JSON object. Simple
    126. 

  126. as that.
    127. 

  127. 

  128. </p>
    129. 

  129. <p>Hold reference to Underscore.js and Backbone.js in the closure in order
    130. 

  130. to make things work even if they are removed from the global namespace
    131. 

  131. 

  132. </p>
    133. 

  133. <p>Generate four random hex digits.
    134. 

  134. </p>
    135. 

  135. 

  136.             </div>
    137. 

  137.             
    138. 

  138.             <div class="content"><div class='highlight'><pre><span class="function"><span class="keyword">function</span> <span class="title">S4</span><span class="params">()</span> {</span>
    139. 

  139.    <span class="keyword">return</span> (((<span class="number">1</span>+Math.random())*<span class="number">0x10000</span>)|<span class="number">0</span>).toString(<span class="number">16</span>).substring(<span class="number">1</span>);
    140. 

  140. };</pre></div></div>
    141. 

  141.             
    142. 

  142.         </li>
    143. 

  143.         
    144. 

  144.         
    145. 

  145.         <li id="section-6">
    146. 

  146.             <div class="annotation">
    147. 

  147.               
    148. 

  148.               <div class="pilwrap ">
    149. 

  149.                 <a class="pilcrow" href="#section-6">&#182;</a>
    150. 

  150.               </div>
    151. 

  151.               <p>Generate a pseudo-GUID by concatenating random hexadecimal.
    152. 

  152. </p>
    153. 

  153. 

  154.             </div>
    155. 

  155.             
    156. 

  156.             <div class="content"><div class='highlight'><pre><span class="function"><span class="keyword">function</span> <span class="title">guid</span><span class="params">()</span> {</span>
    157. 

  157.    <span class="keyword">return</span> (S4()+S4()+<span class="string">"-"</span>+S4()+<span class="string">"-"</span>+S4()+<span class="string">"-"</span>+S4()+<span class="string">"-"</span>+S4()+S4()+S4());
    158. 

  158. };</pre></div></div>
    159. 

  159.             
    160. 

  160.         </li>
    161. 

  161.         
    162. 

  162.         
    163. 

  163.         <li id="section-7">
    164. 

  164.             <div class="annotation">
    165. 

  165.               
    166. 

  166.               <div class="pilwrap ">
    167. 

  167.                 <a class="pilcrow" href="#section-7">&#182;</a>
    168. 

  168.               </div>
    169. 

  169.               <p>Our Store is represented by a single JS object in <em>localStorage</em>. Create it
    170. 

  170. with a meaningful name, like the name you&#39;d give a table.
    171. 

  171. window.Store is deprectated, use Backbone.LocalStorage instead
    172. 

  172. </p>
    173. 

  173. 

  174.             </div>
    175. 

  175.             
    176. 

  176.             <div class="content"><div class='highlight'><pre>Backbone.LocalStorage = window.Store = <span class="keyword">function</span>(name) {
    177. 

  177.   <span class="keyword">this</span>.name = name;
    178. 

  178.   <span class="keyword">var</span> store = <span class="keyword">this</span>.localStorage().getItem(<span class="keyword">this</span>.name);
    179. 

  179.   <span class="keyword">this</span>.records = (store &amp;&amp; store.split(<span class="string">","</span>)) || [];
    180. 

  180. };
    181. 

  181. 

  182. _.extend(Backbone.LocalStorage.prototype, {</pre></div></div>
    183. 

  183.             
    184. 

  184.         </li>
    185. 

  185.         
    186. 

  186.         
    187. 

  187.         <li id="section-8">
    188. 

  188.             <div class="annotation">
    189. 

  189.               
    190. 

  190.               <div class="pilwrap ">
    191. 

  191.                 <a class="pilcrow" href="#section-8">&#182;</a>
    192. 

  192.               </div>
    193. 

  193.               <p>Save the current state of the <strong>Store</strong> to <em>localStorage</em>.
    194. 

  194. </p>
    195. 

  195. 

  196.             </div>
    197. 

  197.             
    198. 

  198.             <div class="content"><div class='highlight'><pre>  save: <span class="keyword">function</span>() {
    199. 

  199.     <span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name, <span class="keyword">this</span>.records.join(<span class="string">","</span>));
    200. 

  200.   },</pre></div></div>
    201. 

  201.             
    202. 

  202.         </li>
    203. 

  203.         
    204. 

  204.         
    205. 

  205.         <li id="section-9">
    206. 

  206.             <div class="annotation">
    207. 

  207.               
    208. 

  208.               <div class="pilwrap ">
    209. 

  209.                 <a class="pilcrow" href="#section-9">&#182;</a>
    210. 

  210.               </div>
    211. 

  211.               <p>Add a model, giving it a (hopefully)-unique GUID, if it doesn&#39;t already
    212. 

  212. have an id of it&#39;s own.
    213. 

  213. </p>
    214. 

  214. 

  215.             </div>
    216. 

  216.             
    217. 

  217.             <div class="content"><div class='highlight'><pre>  create: <span class="keyword">function</span>(model) {
    218. 

  218.     <span class="keyword">if</span> (!model.id) {
    219. 

  219.       model.id = guid();
    220. 

  220.       model.set(model.idAttribute, model.id);
    221. 

  221.     }
    222. 

  222.     <span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id, JSON.stringify(model));
    223. 

  223.     <span class="keyword">this</span>.records.push(model.id.toString());
    224. 

  224.     <span class="keyword">this</span>.save();
    225. 

  225.     <span class="keyword">return</span> <span class="keyword">this</span>.find(model);
    226. 

  226.   },</pre></div></div>
    227. 

  227.             
    228. 

  228.         </li>
    229. 

  229.         
    230. 

  230.         
    231. 

  231.         <li id="section-10">
    232. 

  232.             <div class="annotation">
    233. 

  233.               
    234. 

  234.               <div class="pilwrap ">
    235. 

  235.                 <a class="pilcrow" href="#section-10">&#182;</a>
    236. 

  236.               </div>
    237. 

  237.               <p>Update a model by replacing its copy in <code>this.data</code>.
    238. 

  238. </p>
    239. 

  239. 

  240.             </div>
    241. 

  241.             
    242. 

  242.             <div class="content"><div class='highlight'><pre>  update: <span class="keyword">function</span>(model) {
    243. 

  243.     <span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id, JSON.stringify(model));
    244. 

  244.     <span class="keyword">if</span> (!_.include(<span class="keyword">this</span>.records, model.id.toString()))
    245. 

  245.       <span class="keyword">this</span>.records.push(model.id.toString()); <span class="keyword">this</span>.save();
    246. 

  246.     <span class="keyword">return</span> <span class="keyword">this</span>.find(model);
    247. 

  247.   },</pre></div></div>
    248. 

  248.             
    249. 

  249.         </li>
    250. 

  250.         
    251. 

  251.         
    252. 

  252.         <li id="section-11">
    253. 

  253.             <div class="annotation">
    254. 

  254.               
    255. 

  255.               <div class="pilwrap ">
    256. 

  256.                 <a class="pilcrow" href="#section-11">&#182;</a>
    257. 

  257.               </div>
    258. 

  258.               <p>Retrieve a model from <code>this.data</code> by id.
    259. 

  259. </p>
    260. 

  260. 

  261.             </div>
    262. 

  262.             
    263. 

  263.             <div class="content"><div class='highlight'><pre>  find: <span class="keyword">function</span>(model) {
    264. 

  264.     <span class="keyword">return</span> <span class="keyword">this</span>.jsonData(<span class="keyword">this</span>.localStorage().getItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id));
    265. 

  265.   },</pre></div></div>
    266. 

  266.             
    267. 

  267.         </li>
    268. 

  268.         
    269. 

  269.         
    270. 

  270.         <li id="section-12">
    271. 

  271.             <div class="annotation">
    272. 

  272.               
    273. 

  273.               <div class="pilwrap ">
    274. 

  274.                 <a class="pilcrow" href="#section-12">&#182;</a>
    275. 

  275.               </div>
    276. 

  276.               <p>Return the array of all models currently in storage.
    277. 

  277. </p>
    278. 

  278. 

  279.             </div>
    280. 

  280.             
    281. 

  281.             <div class="content"><div class='highlight'><pre>  findAll: <span class="keyword">function</span>() {
    282. 

  282.     <span class="keyword">return</span> _(<span class="keyword">this</span>.records).chain()
    283. 

  283.       .map(<span class="keyword">function</span>(id){
    284. 

  284.         <span class="keyword">return</span> <span class="keyword">this</span>.jsonData(<span class="keyword">this</span>.localStorage().getItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+id));
    285. 

  285.       }, <span class="keyword">this</span>)
    286. 

  286.       .compact()
    287. 

  287.       .value();
    288. 

  288.   },</pre></div></div>
    289. 

  289.             
    290. 

  290.         </li>
    291. 

  291.         
    292. 

  292.         
    293. 

  293.         <li id="section-13">
    294. 

  294.             <div class="annotation">
    295. 

  295.               
    296. 

  296.               <div class="pilwrap ">
    297. 

  297.                 <a class="pilcrow" href="#section-13">&#182;</a>
    298. 

  298.               </div>
    299. 

  299.               <p>Delete a model from <code>this.data</code>, returning it.
    300. 

  300. </p>
    301. 

  301. 

  302.             </div>
    303. 

  303.             
    304. 

  304.             <div class="content"><div class='highlight'><pre>  destroy: <span class="keyword">function</span>(model) {
    305. 

  305.     <span class="keyword">if</span> (model.isNew())
    306. 

  306.       <span class="keyword">return</span> <span class="literal">false</span>
    307. 

  307.     <span class="keyword">this</span>.localStorage().removeItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id);
    308. 

  308.     <span class="keyword">this</span>.records = _.reject(<span class="keyword">this</span>.records, <span class="keyword">function</span>(id){
    309. 

  309.       <span class="keyword">return</span> id === model.id.toString();
    310. 

  310.     });
    311. 

  311.     <span class="keyword">this</span>.save();
    312. 

  312.     <span class="keyword">return</span> model;
    313. 

  313.   },
    314. 

  314. 

  315.   localStorage: <span class="keyword">function</span>() {
    316. 

  316.     <span class="keyword">return</span> localStorage;
    317. 

  317.   },</pre></div></div>
    318. 

  318.             
    319. 

  319.         </li>
    320. 

  320.         
    321. 

  321.         
    322. 

  322.         <li id="section-14">
    323. 

  323.             <div class="annotation">
    324. 

  324.               
    325. 

  325.               <div class="pilwrap ">
    326. 

  326.                 <a class="pilcrow" href="#section-14">&#182;</a>
    327. 

  327.               </div>
    328. 

  328.               <p>fix for &quot;illegal access&quot; error on Android when JSON.parse is passed null
    329. 

  329. </p>
    330. 

  330. 

  331.             </div>
    332. 

  332.             
    333. 

  333.             <div class="content"><div class='highlight'><pre>  jsonData: <span class="function"><span class="keyword">function</span> <span class="params">(data)</span> {</span>
    334. 

  334.       <span class="keyword">return</span> data &amp;&amp; JSON.parse(data);
    335. 

  335.   }
    336. 

  336. 

  337. });</pre></div></div>
    338. 

  338.             
    339. 

  339.         </li>
    340. 

  340.         
    341. 

  341.         
    342. 

  342.         <li id="section-15">
    343. 

  343.             <div class="annotation">
    344. 

  344.               
    345. 

  345.               <div class="pilwrap ">
    346. 

  346.                 <a class="pilcrow" href="#section-15">&#182;</a>
    347. 

  347.               </div>
    348. 

  348.               <p>localSync delegate to the model or collection&#39;s
    349. 

  349. <em>localStorage</em> property, which should be an instance of <code>Store</code>.
    350. 

  350. window.Store.sync and Backbone.localSync is deprectated, use Backbone.LocalStorage.sync instead
    351. 

  351. </p>
    352. 

  352. 

  353.             </div>
    354. 

  354.             
    355. 

  355.             <div class="content"><div class='highlight'><pre>Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = <span class="keyword">function</span>(method, model, options) {
    356. 

  356.   <span class="keyword">var</span> store = model.localStorage || model.collection.localStorage;
    357. 

  357. 

  358.   <span class="keyword">var</span> resp, errorMessage, syncDfd = $.Deferred &amp;&amp; $.Deferred(); <span class="comment">//If $ is having Deferred - use it.</span>
    359. 

  359. 

  360.   <span class="keyword">try</span> {
    361. 

  361. 

  362.     <span class="keyword">switch</span> (method) {
    363. 

  363.       <span class="keyword">case</span> <span class="string">"read"</span>:
    364. 

  364.         resp = model.id != <span class="literal">undefined</span> ? store.find(model) : store.findAll();
    365. 

  365.         <span class="keyword">break</span>;
    366. 

  366.       <span class="keyword">case</span> <span class="string">"create"</span>:
    367. 

  367.         resp = store.create(model);
    368. 

  368.         <span class="keyword">break</span>;
    369. 

  369.       <span class="keyword">case</span> <span class="string">"update"</span>:
    370. 

  370.         resp = store.update(model);
    371. 

  371.         <span class="keyword">break</span>;
    372. 

  372.       <span class="keyword">case</span> <span class="string">"delete"</span>:
    373. 

  373.         resp = store.destroy(model);
    374. 

  374.         <span class="keyword">break</span>;
    375. 

  375.     }
    376. 

  376. 

  377.   } <span class="keyword">catch</span>(error) {
    378. 

  378.     <span class="keyword">if</span> (error.code === DOMException.QUOTA_EXCEEDED_ERR &amp;&amp; window.localStorage.length === <span class="number">0</span>)
    379. 

  379.       errorMessage = <span class="string">"Private browsing is unsupported"</span>;
    380. 

  380.     <span class="keyword">else</span>
    381. 

  381.       errorMessage = error.message;
    382. 

  382.   }
    383. 

  383. 

  384.   <span class="keyword">if</span> (resp) {
    385. 

  385.     model.trigger(<span class="string">"sync"</span>, model, resp, options);
    386. 

  386.     <span class="keyword">if</span> (options &amp;&amp; options.success)
    387. 

  387.       options.success(resp);
    388. 

  388.     <span class="keyword">if</span> (syncDfd)
    389. 

  389.       syncDfd.resolve(resp);
    390. 

  390. 

  391.   } <span class="keyword">else</span> {
    392. 

  392.     errorMessage = errorMessage ? errorMessage
    393. 

  393.                                 : <span class="string">"Record Not Found"</span>;
    394. 

  394. 

  395.     <span class="keyword">if</span> (options &amp;&amp; options.error)
    396. 

  396.       options.error(errorMessage);
    397. 

  397.     <span class="keyword">if</span> (syncDfd)
    398. 

  398.       syncDfd.reject(errorMessage);
    399. 

  399.   }</pre></div></div>
    400. 

  400.             
    401. 

  401.         </li>
    402. 

  402.         
    403. 

  403.         
    404. 

  404.         <li id="section-16">
    405. 

  405.             <div class="annotation">
    406. 

  406.               
    407. 

  407.               <div class="pilwrap ">
    408. 

  408.                 <a class="pilcrow" href="#section-16">&#182;</a>
    409. 

  409.               </div>
    410. 

  410.               <p>add compatibility with $.ajax
    411. 

  411. always execute callback for success and error
    412. 

  412. </p>
    413. 

  413. 

  414.             </div>
    415. 

  415.             
    416. 

  416.             <div class="content"><div class='highlight'><pre>  <span class="keyword">if</span> (options &amp;&amp; options.complete) options.complete(resp);
    417. 

  417. 

  418.   <span class="keyword">return</span> syncDfd &amp;&amp; syncDfd.promise();
    419. 

  419. };
    420. 

  420. 

  421. Backbone.ajaxSync = Backbone.sync;
    422. 

  422. 

  423. Backbone.getSyncMethod = <span class="keyword">function</span>(model) {
    424. 

  424.   <span class="keyword">if</span>(model.localStorage || (model.collection &amp;&amp; model.collection.localStorage)) {
    425. 

  425.     <span class="keyword">return</span> Backbone.localSync;
    426. 

  426.   }
    427. 

  427. 

  428.   <span class="keyword">return</span> Backbone.ajaxSync;
    429. 

  429. };</pre></div></div>
    430. 

  430.             
    431. 

  431.         </li>
    432. 

  432.         
    433. 

  433.         
    434. 

  434.         <li id="section-17">
    435. 

  435.             <div class="annotation">
    436. 

  436.               
    437. 

  437.               <div class="pilwrap ">
    438. 

  438.                 <a class="pilcrow" href="#section-17">&#182;</a>
    439. 

  439.               </div>
    440. 

  440.               <p>Override &#39;Backbone.sync&#39; to default to localSync,
    441. 

  441. the original &#39;Backbone.sync&#39; is still available in &#39;Backbone.ajaxSync&#39;
    442. 

  442. </p>
    443. 

  443. 

  444.             </div>
    445. 

  445.             
    446. 

  446.             <div class="content"><div class='highlight'><pre>Backbone.sync = <span class="keyword">function</span>(method, model, options) {
    447. 

  447.   <span class="keyword">return</span> Backbone.getSyncMethod(model).apply(<span class="keyword">this</span>, [method, model, options]);
    448. 

  448. };
    449. 

  449. 

  450. <span class="keyword">return</span> Backbone.LocalStorage;
    451. 

  451. }));</pre></div></div>
    452. 

  452.             
    453. 

  453.         </li>
    454. 

  454.         
    455. 

  455.     </ul>
    456. 

  456.   </div>
    457. 

  457. </body>
    458. 

  458. </html>
    459. 

  459.