javascript - 如何访问中继器内的外部元素？

Question

Javascript

var pageData = new Observable({
    appointmentsList: appointmentsList,
    user_role: ''
});

exports.onLoaded = function (args) {
    page = args.object;
    page.bindingContext = pageData;
    pageData.set('user_role', appSettings.getString('role'));

XML

<Repeater items="{{appointmentsList.booking_dates.bookings}}">
    <Repeater.itemsLayout>
        <StackLayout class="appointment-rows" />
    </Repeater.itemsLayout>
    <Repeater.itemTemplate>
        <StackLayout>
            <WrapLayout visibility="{{ user_role === 'agency' ? 'visible' : 'collapse' }}">
                <Label text="{{user_name}}" class="row-client-name row-client-name-new" />
            </WrapLayout>
        </StackLayout>
    </Repeater.itemTemplate>
 </Repeater>

在上面的代码片段中，问题是我无法访问 Repeater 中的 user_role。 谁能帮我如何访问 Repeater 中的外部元素？

谢谢。

Answer 1

基于此https://docs.nativescript.org/core-concepts/data-binding#example-4-creating-listview-child-items-based-on-the-itemtemplate ，你可以尝试这样的事情:

<WrapLayout visibility="{{$parents['Repeater'].user_role,$parents['Repeater'].user_role === 'agency' ? 'visibile' : 'collapse' }}">

或者这样

<WrapLayout visibility="{{$parents['Page'].user_role,$parents['Page'].user_role === 'agency' ? 'visibile' : 'collapse' }}">