使用阵列里面的基因敲除可观察

Question

我有可观察的数组绑定到UI上的html字段。

但是，UI上这些字段的更改没有反映在视图模型中，因为按照Knockout文档，observableArray会跟踪数组中的哪些对象，而不是这些对象的状态。

代码看起来如下：

var RewardMissionModel = function() { 
    var self = this; 
    self.achievementID = ko.observable(); 
    self.rewardAsset = ko.observable(); 
    self.rewards = ko.observableArray([new Reward("Points", "Qty", "", "Item", "")]); 

    self.isDirty = false; 

    //Add reward 
    self.addReward = function() { 
     //var self = this; 
     var tempRewardType = "Points"; 
     self.rewards.push(new Reward(tempRewardType, "Qty", "", "Item", "", 0)); 
    }; 

    //Remove reward 
    self.removeReward = function (reward) { 
     if (self.rewards().length > 1) 
      self.rewards.remove(reward); 
    }; 
    //------------------------------------------------------------------------------ 
}; 

function Reward(rewardType, quantityLabel, rewardQuantity, itemLabel, item, itemID) { 
    var self = this; 
    //self.viewModel = viewModel; 
    self.rewardTypes = ["Points", "Coins", "Items"];  
    self.rewardType = ko.observable(rewardType); 
    self.itemLabel = ko.observable(itemLabel); 
    self.itemText = ko.observable(item); 
    self.quantityLabel = ko.observable(quantityLabel); 
    self.rewardQuantity = ko.observable(rewardQuantity); 
    this.selectedRewardType = ko.observable(rewardType); 
    self.isItemType = function (selectedRewardType) { 
     return selectedRewardType === this.selectedRewardType(); 
    } 

    self.itemID = ko.observable(itemID); 

} 

HTML代码：

<div data-bind="template: { name: 'rewards-template', foreach: rewards }"></div> 
       <script type="text/html" id="rewards-template"> 
        <span style="margin-left:30px">Reward Type</span> 
        <select class="dropdown" data-bind="options: rewardTypes, value: selectedRewardType"></select> 
        <span data-bind="text: itemLabel, visible: isItemType('Items')"></span> 

当添加或移除对象到可观察到的阵列的视图模型脏标志置位，但是当我修改上它不被考虑。

其中一种方法可能是将普通数组放入可观察对象中。

是否有任何代码示例来说明这个或任何更好的方法？

请帮忙。

Answer 1

我认为让可观察数组对象的属性作为可观察对象的最好方法是使它们也可观察，以便创建包含可观察对象的可观察数组。例如::

var viewModel = { 
    accounts: ko.observableArray([]), 
    init: function() { 
     this.accounts.push({ 
      Property1: ko.observable("some value"), 
      Property2: ko.observable("some value"), 
      Property3: ko.observable("some value") 
      }); 
     } 
    }; 

查收这个问题，我认为这是你在找什么

Updating of object inside observable array is done but changes are not coming on browser

Answer 2

function MyObject(val1, val2) 
{ 
    this.firstProperty = ko.observable(val1); 
    this.secondProperty = ko.observable(val1); 
} 

var myViewModel = new function() 
{ 
    var self = this; 
    self.values = ko.observableArray([]); 
    self.values.push(new MyObject("value11", "value12")); 
    self.values.push(new MyObject("value21", "value22")); 
}