淘汰赛更新 ViewModel 单选框更改

Question

情景。 我有一个来自数据库的查找对象的单选列表。选择不同的单选按钮时，我需要更新屏幕上的文本。我设法更新了值，但我无法更新显示。最好的方法是什么？

这里是 jsfiddle： http://jsfiddle.net/CassiusKillay/P42fA/

HTML：

<div data-bind="foreach: workExperienceLookupList">
<li> 
    <input data-bind="attr: {value: Id}, checked: $root.WorkExperienceType.Id" type="radio" name="WorkExperienceType" /> 
    <span data-bind="text: Description"> </span>
</li>
</div>   
<span data-bind="text: WorkExperienceType.Id"></span>
<span data-bind="text: WorkExperienceType.Description"></span>

脚本：

function ViewModel() {
this.WorkExperienceType = new Lookup(initialLookup); //From database
this.workExperienceLookupList = lookupList; //From database
}

function Lookup(data) {
this.Id = ko.observable(data.Id);
this.Description = ko.observable(data.Description);
this.EnDescription = data.EnDescription;
this.CyDescription = data.CyDescription;
this.IsActive = data.IsActive;
this.SortOrder = data.SortOrder;
}

var lookupList = [{
"Id": 1,
"Description": "Description 1"
}, {
"Id": 2,
"Description": "Description 2"
}, {
"Id": 3,
"Description": "Description 3"
}, {
"Id": 4,
"Description": "Description 4"
}];

var initialLookup = {
"Id": 3,
"Description": "Description 3",
};

ko.applyBindings(new ViewModel());

Answer 1

只有 Select 可以按照您要查找的方式绑定到对象，请参阅this relevant answer。但是，您至少可以通过两种方式完成您正在寻找的内容，如下文详细描述的方式，或使用自定义绑定。

我所做的是：

• 已将 WorkExperienceType 更改为可观察并相应更新的视图
• 更新了视图以引用新的 SelectedWorkExperienceType observable，它存储了所选工作类型的 ID。
• Added a subscription to SelectedWorkExperienceType such that when a new value is selected, we search for the appropriate value in the list and set the WorkExperienceType accordingly.

主要变化在于 ViewModel：

function ViewModel() {
var self = this;

self.WorkExperienceType = ko.observable(new Lookup(initialLookup)); //From database
self.workExperienceLookupList = lookupList; //From database
self.SelectedWorkExperienceType = ko.observable();
self.SelectedWorkExperienceType.subscribe(function (newVal) {
    var item = ko.utils.arrayFirst(self.workExperienceLookupList, function(item) { 
        return item.Id == newVal; 
    });

    self.WorkExperienceType(item);
});

}

我已经相应地修改了你的小提琴：http://jsfiddle.net/P42fA/22/