我觉得我错过了一些非常基本的东西,但我无法使用 Knockout.js 使下拉菜单按照我的预期工作。
我想在菜单中显示一组对象,我需要找到选定的选项并将其发布到服务器。我可以渲染菜单,但似乎无法获取所选项目的值。我的视图模型如下所示:
function ProjectFilterItem( name, id ) {
this.Name = name;
this.Id = id;
}
function FilterViewModel() {
this.projectFilters = ko.observableArray([
new ProjectFilterItem( "foo", "1" ),
new ProjectFilterItem( "bar", "2" ),
new ProjectFilterItem( "baz", "3" )
]);
this.selectedProject = ko.observable();
}
ko.applyBindings( new FilterViewModel() );
我的视图标记如下所示:
<select
id = "projectMenu"
name = "projectMenu"
data-bind = "
options: projectFilters,
optionsText: 'Name', /* I have to enquote the value or I get a JS error */
optionsValue: 'Id', /* If I put 'selectedProject here, nothing is echoed in the span below */
optionsCaption: '-- Select Project --'
"
></select>
<b>Selected Project:</b> <span data-bind="text: selectedProject"></span>
如何让选定的菜单项显示在跨度中,并发布到服务器? (我假设我在跨度中渲染的可观察值与我发布的相同。)我是否需要另一个属性ProjectFilterItem
, like this.selected = ko.observable(false);
?如果是这样,我如何将其声明为值的目标?