2

我想在每个待办事项上使用嵌套待办事项来扩展主干待办事项示例代码)。

我必须使用 Backbone 关系还是有更好或更简单的解决方案?

Edit1:我尝试使用 Backbone 关系来使其工作,但在应用程序视图中的“createOnEnter”函数上出现错误:“未捕获的 TypeError:对象函数(obj){返回新包装器(obj);}没有方法”是对象'"。这是代码:

$(function(){

// ------------------- Todo Model ------------------

var Todo = Backbone.RelationalModel.extend({

  relations: [{
     type: Backbone.HasMany,
     key: "children",
     relatedModel: "Todo",
     collectionType: "TodoList",
     reverseRelation: {
         key: "parent",
         includeInJSON: "id"
     } 
  }],

initialize: function() {
  console.log("MODEL: initialize()");
  if (!this.get("order") && this.get ("parent")) {
    this.set( {order: this.get("parent").nextChildIndex() });
  }
},

defaults: function() {
    console.log("MODEL: defaults()");
  return { 
      done: false,
      content: "default content" };
},

nextChildIndex: function() {
    var children = this.get( 'children' );
    return children && children.length || 0;
},

clear: function() {
  this.destroy();
}
});

// -------------------- 待办事项集合 ------------------

var TodoList = Backbone.Collection.extend({
model: Todo,
// Save all of the todo items under the `"todos"` namespace.
localStorage: new Store("todos-backbone"),

done: function() {
  return this.filter(function(todo){ return todo.get('done'); });
},

});
var Todos = new TodoList;

// ------------------- 待办事项视图 ------------------

var TodoView = Backbone.View.extend({
tagName:  "li",

template: _.template($('#item-template').html()),

events: {
  "keypress input.add-child": "addChild",
  "click .check"              : "toggleDone",
  "dblclick label.todo-content" : "edit",
  "click span.todo-destroy"   : "clear",
  "keypress .todo-input"      : "updateOnEnter",
  "blur .todo-input"          : "close"
},

initialize: function() {
    console.log("TODOVIEW: initialize()");
  this.model.bind('change', this.render);
  this.model.bind('destroy', this.remove);

  this.model.bind("update:children", this.renderChild);
  this.model.bind("add:children", this.renderChild);

  this.el = $( this.el );
  this.childViews = {};
},

render: function() {
  console.log("TODOVIEW: render()");
  $(this.el).html(this.template(this.model.toJSON()));
  this.setText();
  this.input = this.$('.todo-input');

  this.el.append("<ul>", {"class": "children"}).append("<input>", { type: "text", "class": "add-child" });

  _.each(this.get("children"), function(child) {
      this.renderChild(child);
  }, this);      
    return this;
},

  addChild: function(text) {
      console.log("TODOVIEW: addChild()");
      if (e.keyCode == 13){
          var text = this.el.find("input.add-child").text();
          var child = new Todo( { parent: this.model, text: text});
      }
  },

  renderChild: function(model){
      console.log("TODOVIEW: renderChild()");
    var childView = new TodoView({ model: model});
    this.childViews[model.cid] = childView;
    this.el.find("ul.children").append(childView.render());
  },

// Remove the item, destroy the model.
clear: function() {
    console.log("TODOVIEW: clear()");
  this.model.set({parent: null});
  this.model.destroy();
  //this.model.clear();
}
});

// - - - - - - - - - 应用程序 - - - - - - - - - - - -

var AppView = Backbone.View.extend({
el: $("#todoapp"),

statsTemplate: _.template($('#stats-template').html()),

events: {
  "keypress #new-todo":  "createOnEnter",
  "keyup #new-todo":     "showTooltip",
  "click .todo-clear a": "clearCompleted",
  "click .mark-all-done": "toggleAllComplete"
},

initialize: function() {
    console.log("APPVIEW: initialize()");
  _.bindAll(this, 'addOne', 'addAll', 'render', 'toggleAllComplete');

  this.input = this.$("#new-todo");

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

  Todos.fetch();
},

render: function() {

},

addOne: function(todo) {
  var view = new TodoView({model: todo});
  this.$("#todo-list").append(view.render().el);
},

addAll: function() {
  Todos.each(this.addOne);
},

// Generate the attributes for a new Todo item.
newAttributes: function() {
  return {
    content: this.input.val(),
    order:   Todos.nextOrder(),
    done:    false
  };
},

createOnEnter: function(e) {
    console.log("APPVIEW: createOnEnter()");
  if (e.keyCode != 13) return;
  Todos.create( this.newAttributes());
  this.input.val('');
},
});
var App = new AppView;
});
4

2 回答 2

2

在这种情况下,我被分配了一个待办事项集合到新的类别模型属性

像 :

var todo = Backbone.Model.extend({

    defaults:function(){
        return {description:"No item description",done:false };
    },
    ...............
    ............... 
});

var todo_collection = Backbone.Collection.extend({
    model: todo,
    ..............
    ..............
});

var Category = Backbone.Model.extend({
    initialize: function(){
        this.toDoCollection = new todo_collection();
    }
});

如果您需要更多参考,请参阅我在 github 上的示例:todo list with nested items using BACKBONE JS

于 2013-01-09T13:07:34.300 回答
1

我只是将一个模型设置为另一个模型的属性。在你的情况下:

window.app.Todo = Backbone.Model.extend({

        // Default attributes for the todo.
        defaults: {
            title: "empty todo...",
            completed: false
        },

        // Ensure that each todo created has `title`.
        initialize: function() {
            if (!this.get("title")) {
                this.set({"title": this.defaults.title});
            }
        if(this.has("childrecords")){
            var self = this;
            self.set("children",new Array());
            $.each(this.get("childrecords"), function(id, child){
                self.get("children").push(new Todo(child));
            });
        }
    },
// ...

对此的几点说明:

  • 我认为任何孩子都是通过 JSON 加载到一个名为“childrecords”的数组中
  • 我使用 jQuery 来迭代这个数组,使用任何你喜欢的东西
  • 您可能希望使用集合而不是数组
于 2012-07-02T20:51:27.857 回答