Question

我试图将<select>与Knockout绑定。在我的ViewModel中，我有两个不同的对象，每个对象都有可观察的属性。

第一个对象是Property，headquarter_id为ko.observable()。第二个对象是Headquarter，其中id和name都为ko.observable()。

我要尝试做的是将select与ko.observableArray()个Headquarter对象绑定，如下所示：

<select id="headquarters" data-bind="options: HeadquarterOptions, optionsText: name, optionsValue: id, optionsCaption: '--Select--', value: Property().headquarter_id"></select>

但我一直在接受：

Uncaught ReferenceError: Unable to process binding "options: function (){return HeadquarterOptions }"
Message: id is not defined

以下是我的ViewModel的样子：

var Property = function () {
    var self = this;
    self.headquarter_id = ko.observable();
}

var Headquarter = function (id, name) {
    var self = this;
    self.id = ko.observable(id);
    self.name = ko.observable(name);
}

var headquarterOptions = [
        new Headquarter(1, "hq 1"),
        new Headquarter(2, "hq 2"),
        new Headquarter(3, "hq 3"),
    ]

var PropertiesViewModel = function (app, dataModel) {
    var self = this;
    self.Property = ko.observable(new Property());
    self.HeadquarterOptions = ko.observableArray(headquarterOptions);
}

ko.applyBindings(PropertiesViewModel);

我怎样才能做到这一点？这是我现在的小提琴：http://jsfiddle.net/juandozco/dzwnb05b/

Answer 1

optionsValue和optionsText应声明为函数而不是值（http://knockoutjs.com/documentation/options-binding.html）：

optionsText: function(item) {return item.name; }
optionsValue: function(item){ return item.id; }

查看更新后的小提琴：http://jsfiddle.net/dzwnb05b/3/

Answer 2

你去http://jsfiddle.net/dzwnb05b/4/

<select class="form-control" id="headquarter" data-bind="options: HeadquarterOptions, optionsText: 'name', optionsValue: 'id', optionsCaption: '--Select--', value: Property().headquarter_id"></select>

您在名称和ID周围缺少单引号。

Knockout使用具有可观察属性的自定义对象绑定select

2 个答案: