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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // A simple module to replace `Backbone.sync` with *localStorage*-based | ||
| // persistence. Models are given GUIDS, and saved into a JSON object. Simple | ||
| // as that. | ||
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| // Generate four random hex digits. | ||
| function S4() { | ||
| return (((1+Math.random())*0x10000)|0).toString(16).substring(1); | ||
| }; | ||
|
|
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| // Generate a pseudo-GUID by concatenating random hexadecimal. | ||
| function guid() { | ||
| return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4()); | ||
| }; | ||
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| // Our Store is represented by a single JS object in *localStorage*. Create it | ||
| // with a meaningful name, like the name you'd give a table. | ||
| var Store = function(name) { | ||
| this.name = name; | ||
| var store = localStorage.getItem(this.name); | ||
| this.data = (store && JSON.parse(store)) || {}; | ||
| }; | ||
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| _.extend(Store.prototype, { | ||
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| // Save the current state of the **Store** to *localStorage*. | ||
| save: function() { | ||
| localStorage.setItem(this.name, JSON.stringify(this.data)); | ||
| }, | ||
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| // Add a model, giving it a (hopefully)-unique GUID, if it doesn't already | ||
| // have an id of it's own. | ||
| create: function(model) { | ||
| if (!model.id) model.id = model.attributes.id = guid(); | ||
| this.data[model.id] = model; | ||
| this.save(); | ||
| return model; | ||
| }, | ||
|
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| // Update a model by replacing its copy in `this.data`. | ||
| update: function(model) { | ||
| this.data[model.id] = model; | ||
| this.save(); | ||
| return model; | ||
| }, | ||
|
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| // Retrieve a model from `this.data` by id. | ||
| find: function(model) { | ||
| return this.data[model.id]; | ||
| }, | ||
|
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| // Return the array of all models currently in storage. | ||
| findAll: function() { | ||
| return _.values(this.data); | ||
| }, | ||
|
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| // Delete a model from `this.data`, returning it. | ||
| destroy: function(model) { | ||
| delete this.data[model.id]; | ||
| this.save(); | ||
| return model; | ||
| } | ||
|
|
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| }); | ||
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| // Override `Backbone.sync` to use delegate to the model or collection's | ||
| // *localStorage* property, which should be an instance of `Store`. | ||
| Backbone.sync = function(method, model, success, error) { | ||
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| var resp; | ||
| var store = model.localStorage || model.collection.localStorage; | ||
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| switch (method) { | ||
| case "read": resp = model.id ? store.find(model) : store.findAll(); break; | ||
| case "create": resp = store.create(model); break; | ||
| case "update": resp = store.update(model); break; | ||
| case "delete": resp = store.destroy(model); break; | ||
| } | ||
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||
| if (resp) { | ||
| success(resp); | ||
| } else { | ||
| error("Record not found"); | ||
| } | ||
| }; |
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