439 lines
17 KiB
HTML
439 lines
17 KiB
HTML
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backbone.localstorage.js
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todos.js
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<li id="title">
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<div class="annotation">
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<h1>backbone.localstorage.js</h1>
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</div>
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</li>
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<li id="section-1">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-1">¶</a>
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</div>
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</div>
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<div class="content"><div class='highlight'><pre><span class="comment">/**
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* Backbone localStorage Adapter
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* Version 1.1.0
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*
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* https://github.com/jeromegn/Backbone.localStorage
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*/</span>
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(<span class="function"><span class="keyword">function</span> <span class="params">(root, factory)</span> {</span>
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<span class="keyword">if</span> (<span class="keyword">typeof</span> define === <span class="string">"function"</span> && define.amd) {</pre></div></div>
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<li id="section-2">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-2">¶</a>
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</div>
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<p>AMD. Register as an anonymous module.</p>
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</div>
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<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>
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</li>
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<li id="section-3">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-3">¶</a>
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</div>
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<p>Use global variables if the locals are undefined.</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="keyword">return</span> factory(_ || root._, Backbone || root.Backbone);
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});
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} <span class="keyword">else</span> {</pre></div></div>
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</li>
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<li id="section-4">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-4">¶</a>
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</div>
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<p>RequireJS isn't being used. Assume underscore and backbone are loaded in <script> tags</p>
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</div>
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<div class="content"><div class='highlight'><pre> factory(_, Backbone);
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}
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}(<span class="keyword">this</span>, <span class="keyword">function</span>(_, Backbone) {</pre></div></div>
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</li>
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<li id="section-5">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-5">¶</a>
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</div>
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<p>A simple module to replace <code>Backbone.sync</code> with <em>localStorage</em>-based
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persistence. Models are given GUIDS, and saved into a JSON object. Simple
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as that.</p>
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<p>Hold reference to Underscore.js and Backbone.js in the closure in order
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to make things work even if they are removed from the global namespace</p>
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<p>Generate four random hex digits.</p>
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</div>
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<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>
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<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>);
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};</pre></div></div>
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</li>
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<li id="section-6">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-6">¶</a>
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</div>
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<p>Generate a pseudo-GUID by concatenating random hexadecimal.</p>
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</div>
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<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>
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<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());
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};</pre></div></div>
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</li>
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<li id="section-7">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-7">¶</a>
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</div>
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<p>Our Store is represented by a single JS object in <em>localStorage</em>. Create it
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with a meaningful name, like the name you'd give a table.
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window.Store is deprectated, use Backbone.LocalStorage instead</p>
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</div>
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<div class="content"><div class='highlight'><pre>Backbone.LocalStorage = window.Store = <span class="keyword">function</span>(name) {
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<span class="keyword">this</span>.name = name;
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<span class="keyword">var</span> store = <span class="keyword">this</span>.localStorage().getItem(<span class="keyword">this</span>.name);
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<span class="keyword">this</span>.records = (store && store.split(<span class="string">","</span>)) || [];
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};
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_.extend(Backbone.LocalStorage.prototype, {</pre></div></div>
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</li>
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<li id="section-8">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-8">¶</a>
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</div>
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<p>Save the current state of the <strong>Store</strong> to <em>localStorage</em>.</p>
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</div>
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<div class="content"><div class='highlight'><pre> save: <span class="keyword">function</span>() {
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<span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name, <span class="keyword">this</span>.records.join(<span class="string">","</span>));
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},</pre></div></div>
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</li>
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<li id="section-9">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-9">¶</a>
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</div>
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<p>Add a model, giving it a (hopefully)-unique GUID, if it doesn't already
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have an id of it's own.</p>
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</div>
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<div class="content"><div class='highlight'><pre> create: <span class="keyword">function</span>(model) {
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<span class="keyword">if</span> (!model.id) {
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model.id = guid();
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model.set(model.idAttribute, model.id);
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}
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<span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id, JSON.stringify(model));
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<span class="keyword">this</span>.records.push(model.id.toString());
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<span class="keyword">this</span>.save();
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<span class="keyword">return</span> <span class="keyword">this</span>.find(model);
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},</pre></div></div>
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</li>
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<li id="section-10">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-10">¶</a>
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</div>
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<p>Update a model by replacing its copy in <code>this.data</code>.</p>
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</div>
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<div class="content"><div class='highlight'><pre> update: <span class="keyword">function</span>(model) {
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<span class="keyword">this</span>.localStorage().setItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id, JSON.stringify(model));
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<span class="keyword">if</span> (!_.include(<span class="keyword">this</span>.records, model.id.toString()))
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<span class="keyword">this</span>.records.push(model.id.toString()); <span class="keyword">this</span>.save();
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<span class="keyword">return</span> <span class="keyword">this</span>.find(model);
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},</pre></div></div>
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</li>
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<li id="section-11">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-11">¶</a>
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</div>
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<p>Retrieve a model from <code>this.data</code> by id.</p>
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</div>
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<div class="content"><div class='highlight'><pre> find: <span class="keyword">function</span>(model) {
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<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));
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},</pre></div></div>
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</li>
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<li id="section-12">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-12">¶</a>
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</div>
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<p>Return the array of all models currently in storage.</p>
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</div>
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<div class="content"><div class='highlight'><pre> findAll: <span class="keyword">function</span>() {
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<span class="keyword">return</span> _(<span class="keyword">this</span>.records).chain()
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.map(<span class="keyword">function</span>(id){
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<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));
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}, <span class="keyword">this</span>)
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.compact()
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.value();
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},</pre></div></div>
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</li>
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<li id="section-13">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-13">¶</a>
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</div>
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<p>Delete a model from <code>this.data</code>, returning it.</p>
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</div>
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<div class="content"><div class='highlight'><pre> destroy: <span class="keyword">function</span>(model) {
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<span class="keyword">if</span> (model.isNew())
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<span class="keyword">return</span> <span class="literal">false</span>
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<span class="keyword">this</span>.localStorage().removeItem(<span class="keyword">this</span>.name+<span class="string">"-"</span>+model.id);
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<span class="keyword">this</span>.records = _.reject(<span class="keyword">this</span>.records, <span class="keyword">function</span>(id){
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<span class="keyword">return</span> id === model.id.toString();
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});
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<span class="keyword">this</span>.save();
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<span class="keyword">return</span> model;
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},
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localStorage: <span class="keyword">function</span>() {
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<span class="keyword">return</span> localStorage;
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},</pre></div></div>
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</li>
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<li id="section-14">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-14">¶</a>
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</div>
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<p>fix for "illegal access" error on Android when JSON.parse is passed null</p>
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</div>
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<div class="content"><div class='highlight'><pre> jsonData: <span class="function"><span class="keyword">function</span> <span class="params">(data)</span> {</span>
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<span class="keyword">return</span> data && JSON.parse(data);
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}
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});</pre></div></div>
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</li>
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<li id="section-15">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-15">¶</a>
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</div>
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<p>localSync delegate to the model or collection's
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<em>localStorage</em> property, which should be an instance of <code>Store</code>.
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window.Store.sync and Backbone.localSync is deprectated, use Backbone.LocalStorage.sync instead</p>
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</div>
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<div class="content"><div class='highlight'><pre>Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = <span class="keyword">function</span>(method, model, options) {
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<span class="keyword">var</span> store = model.localStorage || model.collection.localStorage;
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<span class="keyword">var</span> resp, errorMessage, syncDfd = $.Deferred && $.Deferred(); <span class="comment">//If $ is having Deferred - use it.</span>
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<span class="keyword">try</span> {
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<span class="keyword">switch</span> (method) {
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<span class="keyword">case</span> <span class="string">"read"</span>:
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resp = model.id != <span class="literal">undefined</span> ? store.find(model) : store.findAll();
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<span class="keyword">break</span>;
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<span class="keyword">case</span> <span class="string">"create"</span>:
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resp = store.create(model);
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<span class="keyword">break</span>;
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<span class="keyword">case</span> <span class="string">"update"</span>:
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resp = store.update(model);
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<span class="keyword">break</span>;
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<span class="keyword">case</span> <span class="string">"delete"</span>:
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resp = store.destroy(model);
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<span class="keyword">break</span>;
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}
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} <span class="keyword">catch</span>(error) {
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<span class="keyword">if</span> (error.code === DOMException.QUOTA_EXCEEDED_ERR && window.localStorage.length === <span class="number">0</span>)
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errorMessage = <span class="string">"Private browsing is unsupported"</span>;
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<span class="keyword">else</span>
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errorMessage = error.message;
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}
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<span class="keyword">if</span> (resp) {
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model.trigger(<span class="string">"sync"</span>, model, resp, options);
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<span class="keyword">if</span> (options && options.success)
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options.success(resp);
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<span class="keyword">if</span> (syncDfd)
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syncDfd.resolve(resp);
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} <span class="keyword">else</span> {
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errorMessage = errorMessage ? errorMessage
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: <span class="string">"Record Not Found"</span>;
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<span class="keyword">if</span> (options && options.error)
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options.error(errorMessage);
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<span class="keyword">if</span> (syncDfd)
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syncDfd.reject(errorMessage);
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}</pre></div></div>
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</li>
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<li id="section-16">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-16">¶</a>
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</div>
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<p>add compatibility with $.ajax
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always execute callback for success and error</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> (options && options.complete) options.complete(resp);
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<span class="keyword">return</span> syncDfd && syncDfd.promise();
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};
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Backbone.ajaxSync = Backbone.sync;
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Backbone.getSyncMethod = <span class="keyword">function</span>(model) {
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<span class="keyword">if</span>(model.localStorage || (model.collection && model.collection.localStorage)) {
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<span class="keyword">return</span> Backbone.localSync;
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}
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<span class="keyword">return</span> Backbone.ajaxSync;
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};</pre></div></div>
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</li>
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<li id="section-17">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-17">¶</a>
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</div>
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<p>Override 'Backbone.sync' to default to localSync,
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the original 'Backbone.sync' is still available in 'Backbone.ajaxSync'</p>
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</div>
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<div class="content"><div class='highlight'><pre>Backbone.sync = <span class="keyword">function</span>(method, model, options) {
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<span class="keyword">return</span> Backbone.getSyncMethod(model).apply(<span class="keyword">this</span>, [method, model, options]);
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};
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<span class="keyword">return</span> Backbone.LocalStorage;
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}));</pre></div></div>
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</li>
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</ul>
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</div>
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</body>
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</html>
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