Question

我有几个视图，我有一些常见的代码要抽象到自定义的Backbone.View类中。这样做有什么最佳做法吗？

是一个很好的模式来做这样的事情？：

 // Base Grid view
 var GridView = Backbone.View.extend({
     initialize : function(){
                 //common view init code .. 

                 //do the plug in overrides
                 if (options.addHandler)
                     this.addHandler = options.addHandler;
                 if (options.events)
                     //?? extend default events or override? 
                     this.events = $.extend(this.events, options.events);
                 }, 
     addHandler : function() { 
                //defaulthandler this code can be overridden
                });
});


// in another object create some views from the GridView base
....
var overrides = { events:"xxx yyy", el: ulElement addHandler: myAddFunction } 
var UserList = GridView.extend(overrides)
var userList = new UserList(users, options);
....

var coursesOverrides : {addHandler:  ...}
var coursesOptions:    {el: courseElement, ...}
var CourseList = GridView.extend(coursesOverrides)
var courseList= new CourseList (courses, coursesOptions)

// along the same lines  maybe there's an abstraction for toolbar views 
var ClassToolbarView = ToolbarBase.extend(toolOverrides)
var classtoolbar = new ClassToolbarView(actions, toolbaropts)

对于扩展View以重构公共视图代码的任何指示，我们都很感激。

Answer 1

首先，我没有看到您initializer()中传递的选项，因此这是一个错误。

其次，.extend()方法是继承的：

var GridView = Backbone.View.extend({ ... })
var GridViewWithNewFunctionsAndEvents = GridView.extend({ ... })

您可以替换或扩展GridView的功能，并调用new GridViewWithNewFunctionsAndEvents()并在您需要的新对象中获得额外的功能，就像扩展Backbone stock View类一样。

如果需要扩展初始化程序，可以这样做来调用超类的初始化程序：

 var GridViewWithNewFunctionsAndEvents = GridView.extend({
    initializer: function(options) {
        GridView.prototype.initializer.call(this, options);
        /* Your stuff goes here */
    }
  });

Subclassing Backbone.View

1 个答案: