todomvc/examples/canjs_require/bower_components/canjs-localstorage/can.localstorage.js

> Helping you select an MV\* framework

(function(define) {
  if (typeof define == "undefined") {
    define = function(deps, fn) {
      can.Model.LocalStorage = fn(can.Model);
    }
  }

  define(['can/model'], function(Model) {
    return Model.extend({
      // Implement local storage handling
      localStore: function(cb) {
        var name = this.name,
          data = JSON.parse(window.localStorage[name] || (window.localStorage[name] = '[]')),
          res = cb.call(this, data);
        if (res !== false) {
          can.each(data, function(todo) {
            delete todo.editing;
          });
          window.localStorage[name] = JSON.stringify(data);
        }
      },

      findAll: function(params) {
        var def = new can.Deferred();
        this.localStore(function(todos) {
          var instances = [],
            self = this;
          can.each(todos, function(todo) {
            instances.push(new self(todo));
          });
          def.resolve({data: instances});
        });
        return def;
      },

      destroy: function(id) {
        var def = new can.Deferred();
        this.localStore(function(todos) {
          for (var i = 0; i < todos.length; i++) {
            if (todos[i].id === id) {
              todos.splice(i, 1);
              break;
            }
          }
          def.resolve({});
        });
        return def;
      },

      create: function(attrs) {
        var def = new can.Deferred();
        this.localStore(function(todos) {
          attrs.id = attrs.id || parseInt(100000 * Math.random(), 10);
          todos.push(attrs);
        });
        def.resolve({id: attrs.id});
        return def;
      },

      update: function(id, attrs) {
        var def = new can.Deferred(), todo;
        this.localStore(function(todos) {
          for (var i = 0; i < todos.length; i++) {
            if (todos[i].id === id) {
              todo = todos[i];
              break;
            }
          }
          can.extend(todo, attrs);
        });
        def.resolve({});
        return def;
      }
    }, {});
  });
})(window.define);