RadList中的图像使用ListViewStaggeredLayout的NativeScript Telerik-UI [英] NativeScript Telerik-UI using ListViewStaggeredLayout for images in RadListView

问题描述

我有一个使用Telerik-UI的NativeScript/Angular2应用程序，当我尝试在RadListView中使用ListViewStaggeredLayout指令显示图像时，出现空白页.使用相同的代码显示文本可以正常工作，即2列和交错的布局.使用ListViewGridLayout来显示图像也可以.我看过旧的Telerik文档，表明可以/可以使用图像，但是我不知道要设置什么. HTML代码如下.谢谢.

I have a NativeScript/Angular2 app using Telerik-UI, when I try to display images using ListViewStaggeredLayout directive in a RadListView I get a blank page. Using same code to display text works OK, i.e. 2 columns and staggered layout. Using ListViewGridLayout to display images works as well. I have seen old Telerik documentation showing this is/was possible with images, but I cannot figure out what to set. The HTML code is below. Thanks.

<RadListView [items]="pictures">
    <template tkListItemTemplate let-item="item">
        <GridLayout>
            <Image col="0" src="{{ 'res://listview/layouts/' + item.photo + '.jpg' }}" stretch="aspectFill" loadMode="async"></Image>
            <!-- <Label col="0" [text]="item.title" textWrap="true"></Label> -->
        </GridLayout>
    </template>
    <ListViewStaggeredLayout tkListViewLayout scrollDirection="Vertical" spanCount="2" itemWidth="180"></ListViewStaggeredLayout>
    <!-- <ListViewGridLayout tkListViewLayout scrollDirection="Vertical" itemHeight="200" spanCount="2"></ListViewGridLayout> -->
</RadListView>

推荐答案

您似乎已对tkListItemTemplate中Image的src使用了非Angular 2绑定语法({{ ... }}).只需将其更改为类似[src]="'res://listview/layouts/' + item.photo + '.jpg'"之类的文件，所有文件就可以正常工作.甚至最好删除硬编码的res://listview/layouts/和'.jpg'并将它们添加到数据项对象的.photo属性"，在绑定中使用这种硬编码的字符串不是一个好方法.

It looks like you have used a non Angular 2 binding syntax ( {{ ... }} ) for the src of the Image in the tkListItemTemplate. Simply change it to something like [src]="'res://listview/layouts/' + item.photo + '.jpg'" and all should be working. Or even better remove the hard coded res://listview/layouts/ and '.jpg' and add them to "data item object's .photo property", having such hard coded strings in bindings is not a good approach.

我已经使用此模板对此进行了测试，并且可以正常工作:

I have tested this with this template and all works as expected:

<GridLayout>
    <RadListView [items]="staggeredItems">
        <template tkListItemTemplate let-item="item">
            <GridLayout class="listItemTemplateGrid">
                <Image [src]="item.image" stretch="aspectFill"></Image>
                <GridLayout verticalAlignment="bottom">
                    <StackLayout class="labelsStackLayout">
                        <Label [text]="item.title"></Label>
                        <Label [text]="item.description"></Label>
                    </StackLayout>
                </GridLayout>
            </GridLayout>
        </template>

        <ListViewStaggeredLayout tkListViewLayout scrollDirection="Vertical" spanCount="3"></ListViewStaggeredLayout>
    </RadListView>
</GridLayout>

staggeredItems属于此类:

export class DataItem {
    constructor(public description?: string, public title?: string,  public image?: string) {
    }
}

这篇关于RadList中的图像使用ListViewStaggeredLayout的NativeScript Telerik-UI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！