Backbone JS将扩展模型添加到其继承的模型类型集合

Question

我刚开始挖掘backboneJS，并已开始构建一个小型文本应用程序（http://codepen.io/azaslavsky/pen/fJghE）。一切都进展顺利，除了我有一个问题：一旦用户点击提交按钮，我想表单容器视图：

1. 解析所有的表单字段。这些是各种模型类型（标题字段，所见即所得文本编辑器等）以及一个集合（tagInput.collection - 用户放入的所有标签）
2. 创建一个标准化的JSON对象所有这些数据的用户给出了应用传递到服务器

目前，我尝试做Backbone.Model延伸到了新的一类，“FormModel，”刚刚包含默认属性“值”。然后，我在包含容器内所有不同模型的主容器上创建一个新的集合。所以，container.collection的模型是FormModel，但是我想要的.add（）的所有实际模型都是扩展类 FormModel。这可能吗？每当我尝试访问集合时，它总是空的！我觉得我缺少了解底层逻辑指导骨干的一些关键部分，但我不能确切地说出什么！

下面附上（我认为是）相关的代码。

//LINE 9 in Full Code 
// Generic, very simply model type for any type of form entry that we can extend 
    var FormModel = Backbone.Model.extend({ 
    defaults: { 
     value: '', 
    } 
    }); 

    //Input class definition 
    var input = {}; 
    input.model = FormModel.extend({ 
    defaults: { 
     placeHolder: 'Enter Title Here...', 
     class: '', 
     warn: 'a title', 
     size: '20px' 
    } 
    }); 
    input.view = Backbone.View.extend({ 
    events: { 
     'keypress input': 'checkKey', 
     'change input': 'updateValue' 
    }, 
    initialize: function() { 
     _.bindAll(this, 'render', 'checkKey', 'doSubmit','updateValue'); 
     this.render(); 
    }, 
    render: function() { 
     if (this.model.get('class')) { 
     $(this.el).addClass(this.model.get('class')); 
     } 
     $(this.el).append('<div class="clearButton inputClear"></div>'); 
     $(this.el).append('<input type="text" placeHolder="'+this.model.get('placeHolder')+'" style="font-size: '+this.model.get('size')+'">'); 
     this.clickable = true; 
     return this; 
    }, 
    checkKey: function(e) { 
     if (e.keyCode === 13) { 
     this.doSubmit(); 
     } 
    }, 
    doSubmit: function() { 
     var thisVal = this.updateValue(); 
     if (thisVal.length > 0) { 
     } else { 
     alert('Hey, you need to '+this.model.get('warn')+' before you can submit this post!'); 
     } 
    }, 
    updateValue: function() { 
     var thisVal = $('input', this.el).val(); 
     this.model.set('value', thisVal); 
     return thisVal; 
    }, 
    }); 



/* 
*[...] 
*/ 



//LINE 132 in Full Code 
//Tag class definition 
    var tag = {}; 
    tag.model = FormModel.extend({ 
    defaults: { 
     title: '', 
     exists: false, 
     parent: $('#container'), 
    } 
    }); 
    tag.view = Backbone.View.extend({ 
    events: { 
     'click .clearButton': 'kill', 
    }, 
    initialize: function() { 
     _.bindAll(this, 'render', 'kill'); 
     this.render(); 
    }, 
    render: function() { 
     $(this.el).addClass('tagRow'); 
     $(this.el).html(this.model.get('title')); 
     $(this.el).append('<div class="clearButton tagClose"></div>'); 
     this.clickable = true; 
     return this; 
    }, 
    kill: function() { 
     if (this.clickable) { 
     this.clickable = false; 
     var that = this; 
     $(this.el).animate({opacity: 0}, 500, function(){ 
      $(that.el).remove(); 
      this.model.destroy(); 
     }); 
     } 
    } 
    }); 
    tag.collection = Backbone.Collection.extend({ 
    model: tag.model, 
    }); 



/* 
*[...] 
*/ 



//LINE 214 in Full Code 
    //Container class definition 
    var container = {}; 
    container.collection = Backbone.Collection.extend({ 
    model: FormModel 
    }); 
    container.model = Backbone.Model.extend({ 
    }); 
    container.view = Backbone.View.extend({ 
    el: $('body'), 
    initialize: function() { 
     _.bindAll(this, 'render', 'appendItem', 'newTag', 'makeTagDialog', 'validate'); 
     this.collection = new container.collection(); 
     this.fields = []; 
     this.render(); 
    }, 
    render: function() { 
     $('body').append('<div id="container"></div>'); 
     this.container = $('body #container'); 

     var title = new input.model({ 
     placeHolder: 'Enter Title Here...', 
     class: 'subArea titleArea', 
     warn: 'a title', 
     }); 
     this.appendItem(new input.view({model: title}).el); 

     this.appendItem(new editor.view({model: new editor.model()}).el); 
     this.makeTagDialog(); 

     var submitButton = new submit.view({model: new submit.model()}); 
     this.listenTo(submitButton.model, 'change:counter', this.validate); 
     $(this.container).append(submitButton.el); 

     return this; 
    }, 
    appendItem: function(view) { 
     this.collection.add(view.model); 
     $(this.container).append(view); 
    }, 
    makeTagDialog: function() { 
     this.container.append('<div class="subArea tagDialog"></div>'); 
     var tags = $('.tagDialog', this.container); 
     tags.append('<div class="tagArea"></div>'); 
     var tagInput = new input.view({ 
     model: new input.model({ 
      placeHolder: 'Tag Your Post...', 
      class: 'tagInput', 
      warn: 'at least one tag', 
      size: '16px', 
      value: '' 
     }) 
     }); 
     tagInput.addTag = function() { 
     if (this.model.get('value').length) { 
      this.collection.add(new tag.model({ 
      title: this.model.get('value') 
      })); 
     } 
     this.clearInput(); 
     }; 
     tagInput.model.on('change:value', tagInput.addTag, tagInput); 
     this.appendItem(tagInput.el); 
     $('.tagInput .clearButton').css('marginTop', '-2px'); 

     tagInput.collection = new tag.collection(); 
     tagInput.collection.on('add', this.newTag); 
    }, 
    newTag: function(model) { 
     thisView = new tag.view({model: model}); 
     thisView.parent = this; 
     $('.tagArea', this.container).append(thisView.el); 
    }, 
    validate: function(){ 
     alert('Form validation launched!'); 
     var form = []; 
     this.collection.each(function(value) { 
     form.push(value); 
     }); 
    } 
    }); 

new container.view({model: container.model}); 
})(jQuery); 

谢谢大家的帮助：我的最新的我“的小应用程序”的版本，完整的代码也是上面链接！

Answer 1

问题在于appendItem方法。 要调用它以这样的方式

this.appendItem(new input.view({model: title}).el); 

但这种方式要传递作为参数的查看El，而不是视图本身，所以view.model是不确定的！

你应该用这种方式重构appendItem：

appendItem: function(view) { 
    this.collection.add(view.model); 
    $(this.container).append(view.el); 
}, 

，并称之为：

this.appendItem(new editor.view({model: new editor.model()}));