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Backbone.jsAdvent Calendar 2011

Day 24

backbone-localstorage.jsを使うとかなり簡単にデータの保存ができる

Last updated at Posted at 2012-12-26

Backbone.jsのサンプルの一つに上がってるtodos.jsを読んでみると、どうもbackbone-localstorage.jsを使えばかなり簡単にデータを保存できるらしい。

backbone-localstorage.jsとは

A simple module to replace Backbone.sync with localStorage-based persistence. Models are given GUIDS, and saved into a JSON object. Simple as that.
backbone-localstorage.js


window.TodoList = Backbone.Collection.extend({
    model: Todo,
    localStorage: new Store("todos"), // これ
    // ...
});

で、使い方としては件のtodos.jsだと


    initialize: function() {
      this.input    = this.$("#new-todo");

      Todos.bind('add',   this.addOne, this);
      Todos.bind('reset', this.addAll, this);
      Todos.bind('all',   this.render, this);

      Todos.fetch();
    },

こんな感じで初期化処理のときに保存してるtodoをロードしたり、


 createOnEnter: function(e) {
      var text = this.input.val();
      if (!text || e.keyCode != 13) return;
      Todos.create({text: text});
      this.input.val('');
    },

こんな感じでデータをlocalStorageにcreateしたりしている模様。

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