KnockoutJS - 創建對象不起作用

我正在做一個包含菜單和子菜單的導航列表。KnockoutJS - 創建對象不起作用

我有以下結構：

function Menu(navigation) { 

    this.NavigationUrl = ko.observable(navigation.NavigationUrl); 
    this.NavigationTitle = ko.observable(navigation.NavigationTitle); 
    this.NavigationDescription = ko.observable(navigation.NavigationDescription); 

    var mappedChildren = ko.utils.arrayMap(navigation.Children, function (child) { 
     return new Menu(child); 
    }); 

    this.Children = ko.observableArray(mappedChildren); 
} 

function DashboardViewModel() { 

    var self = this; 
    self.LoggedUser = ko.observable(""); 
    self.Navigations = ko.observableArray([]); 

    $.get('/Home/DashboardDependencies', {}, function (result) { 

     self.LoggedUser(result.LoggedUser); 

     var mappedNavigations = ko.utils.arrayMap(result.Navigations, function (item) { 
      var menu = new Menu(item); 

      // When I alert item, the result appears properly: 
      // { "NavigationTitle": "blah", "NavigationDescription": "bleh" [...] } 
      alert(JSON.stringify(item)); 

      // But when I alert the new menu object, the result doesn't appear: 
      // Just: "{}" 
      alert(JSON.stringify(menu)); 

      return menu; 
     }); 
     self.Navigations = mappedNavigations; 
    }); 
} 

ko.applyBindings(new DashboardViewModel());

因此，檢查出來。當我嘗試提醒項目變量時，結果顯示正確。當我嘗試提醒新的Menu對象時，結果只顯示{}。爲什麼這個'發生？

謝謝大家的幫助！

來源

2013-10-20 Kiwanax

[Observable的設置值在Knockout中未更新]（http://stackoverflow.com/questions/19391415/setting-value-of-observable-not-updating-in-knockout） –

self.Navigations = ..確實不是更新現有的可觀察數組。因此，視圖綁定的可觀察數組永遠不會更新，並且視圖永遠不會更新。代替self.Navigations(..)。

來源

2013-10-20 15:55:49 user2864740

工程像一個魅力！謝謝！ – Kiwanax

KnockoutJS - 創建對象不起作用

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