Knockoutjs - 与映射插件订阅

Question

我使用的是淘汰赛映射插件，以前我都会设定一个订阅像这样

self.selectedProduct.subscribe(function (name) { 

} 
    but I'm unsure of how to do this in this format below. The message I get is 

“丢失：物业编号后”

var viewModel = { 

    products: ko.mapping.fromJS([]), 
    productOptions: ko.mapping.fromJS([]), 
    productOptions.subscribe = function (name) { 
     alert('somthing change'); 
    }, 
    loadInitialData: function() { 
     ko.mapping.fromJS(serverData, viewModel.productOptions); 
    } 
    } 

Answer 1

如果您将视图模型定义为对象字面值，则不能像进行内联操作那样进行函数调用。您必须在创建视图模型之后执行此操作，或以不同方式创建视图模型。

如果你做了以后，那么它看起来是这样的：

var viewModel = { 
    products: ko.mapping.fromJS([]), 
    productOptions: ko.mapping.fromJS([]), 
    loadInitialData: function() { 
     ko.mapping.fromJS(serverData, viewModel.productOptions); 
    } 
    }; 

    viewModel.productOptions.subscribe = function (name) { 
     alert('somthing change'); 
    }; 

，如果您使用一个构造函数您的视图模式，那么它看起来像：

var ViewModel = function() { 
    this.products = ko.mapping.fromJS([]); 
    this.productOptions = ko.mapping.fromJS([]); 
    this.productOptions.subscribe = function(name) { 
     alert("something change"); 
    }; 

    this.loadInitialData = function() { 
     ko.mapping.fromJS(serverData, this.productOptions); 
    }; 
}; 


var viewModel = new ViewModel();