Question

我正在使用Knockout这样的选择：

<hr class="light" />

在HTML部分中是：

   function journal(data) {
        this.id = ko.observable(data.ID);
        this.name = ko.observable(data.Name);
   }

   var self = this;
   self.journals = ko.observableArray([]);

   $.getJSON("/JournalEntries/GetJournalsList", function (data) {
            var mappedJournals = $.map(data, function (item) { return new journal(item) });
            self.journals(mappedJournals);
   });

   self.getData = function(journalid) {
        alert(journalid);
   };

它不带有ID，只是'[Object object]'

我做错了什么？

Answer 1

你通常不想在淘汰赛中以这种方式对事件作出反应。

如果您想对<select>中所选值的更改作出反应，请将所选值保存到observable（通过value绑定）并订阅该observable（或基本计算值）在那个可观察的）。

＆＃13;

function Journal(data) {
    this.id = ko.observable(data.ID);
    this.name = ko.observable(data.Name);
}

function ViewModel() {
    var self = this;

    // data
    self.journals = ko.observableArray();
    self.selectedJournal = ko.observable();

    // subscriptions
    self.selectedJournal.subscribe(function (journal) {
       if (journal) alert( journal.id() );
    });

    // init
    var newJournals = ko.utils.arrayMap([
        {ID: 1, Name: "Item 1"},
        {ID: 2, Name: "Item 2"},
        {ID: 3, Name: "Item 3"},
        {ID: 4, Name: "Item 4"},
    ], function(item) { return new Journal(item); });

    self.journals(newJournals);
}

ko.applyBindings(new ViewModel());

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>

<select data-bind="
  options: journals,
  optionsCaption: 'Choose...',
  optionsText: 'name',
  value: selectedJournal
"></select>

<hr>
<pre data-bind="text: ko.toJSON($root, null, 2)"></pre>

＆＃13;

Answer 2

self.journals是一个Observable数组，就像你需要推送的javascript中的普通数组一样，项目进入数组

 self.journals.push(mappedJournals);

Knockout Javascript select返回Object对象

2 个答案: