覆盖骨干“设定”的方法 [英] Override backbone 'set' method

问题描述

我要重写骨干一套方法，以便每当我一值设置为骨干示范该属性登记被调用回调，不检查该属性的同一previous值。

  VAR模型= Backbone.Model.extend（{
     默认值：{
         为prop1：真
     }
}）;VAR视图= Backbone.View.extend（{
     初始化：功能（）{
        this.listenTo（this.model，改变：为prop1，this.callback）;     }，
     回调：函数（）{
        //集合呼吁为prop1
     }
}）;VAR M1 =新模式（）;
VAR V1 =新的视图（{型号：M1}）;
m1.set（为prop1，真正的）; //它不会触发回调，因为我设置相同的值，为prop1
 

解决方案

您可以写这样设置骨干模型的新方法：

  VAR模型= Backbone.Model.extend（{
     默认值：{
         为prop1：真实的;
     }，     //重载集
     设置：功能（属性，选项）{
        //将被触发每当一套被称为
        如果（attributes.hasOwnProperty（为prop1））{
           this.trigger（'的变化：为prop1'）;
        }        返回Backbone.Model.prototype.set.call（此，属性选项）;
     }
}）;
 

I want to override backbone set method so that whenever I set a value to backbone Model the callbacks registered on that attribute get called without checking for same previous value of that attribute .

var model = Backbone.Model.extend({
     defaults : {
         prop1 : true 
     }
});

var view = Backbone.View.extend({
     initialize : function(){
        this.listenTo(this.model,"change:prop1", this.callback);

     },
     callback : function(){
        // set is called on prop1
     }
});

var m1 = new model();
var v1 = new view({model:m1});
m1.set("prop1",true); // It doesn't trigger callback because I'm setting the same value to prop1

解决方案

You can write a new method in backbone model set like this :

var model = Backbone.Model.extend({
     defaults: {
         prop1: true;
     },

     // Overriding set
     set: function(attributes, options) {
        // Will be triggered whenever set is called
        if (attributes.hasOwnProperty(prop1)) {
           this.trigger('change:prop1');
        }  

        return Backbone.Model.prototype.set.call(this, attributes, options);
     }
});   

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