更改ListView中当前选定项目的背景颜色时出现问题-Nativescript/Angular2 [英] Issues changing the background colour of the currently selected item in a ListView - Nativescript/Angular2

问题描述

我正忙于Nativescript/Angular2应用程序，在该应用程序中，我在ListView中显示有效库存清单.我正在尝试更改ListView中当前选定的库存盘点项目的背景颜色，以显示当前选定的StockTake.我将css类添加到ng-template内的StackLayout中，但是由于某些原因，当我点击某个项目时未应用css.知道这里可能出什么问题/如何解决这个问题吗?我没有任何错误，所以我完全不知道这里可能是什么问题...

I am busy with a Nativescript/Angular2 app where I display a list of active stock takes in a ListView. I am trying to change the background color lf the current selected stock take item in the ListView to show the currently selected StockTake. I add the css class to the StackLayout inside the ng-template but for some reason the css isn't applied when I tap on a item. Any idea what could be going wrong here/how I can fix this? I don't get any errors so i'm completely lost as to what the issue might be here...

    my ListView xml code:

    <ListView [items]="activeStockTakes" class="list-group">
                        <ng-template let-activeStockTake="item" let-i="index">
                            <StackLayout [class.highlight]="item.isSelected" (tap)="selectActiveStockTake(item, index)">
                                <Label class="list-group-item" [text]="activeStockTake.UserCode + ' - ' + activeStockTake.Comment"></Label>
                            </StackLayout>
                        </ng-template>
                    </ListView>


    my css code:

    .highlight {
        background-color: red !important;
        border-radius: 3;
    }

    my selectActiveStockTake event:

selectActiveStockTake(item, index) {
    //console.log(args.index);
    this.selectedActiveStockTake = this.activeStockTakes[index];
    this.selectedActiveStockTake.isSelected = true;
    console.log(this.selectedActiveStockTake.UserCode);
}

推荐答案

尝试

<ListView [items]="activeStockTakes" class="list-group">
    <ng-template let-activeStockTake="item" let-i="index">
        <StackLayout [class.highlight]="item.isSelected" (tap)="selectActiveStockTake(item, i)">
            <Label class="list-group-item" [text]="activeStockTake.UserCode + ' - ' + activeStockTake.Comment"></Label>
        </StackLayout>
    </ng-template>
</ListView>

然后:

selectActiveStockTake(item, i) {
  item.isSelected = !item.isSelected;
}

这是一个更干净的解决方案，应该可以正常工作.

This is a much cleaner solution and should work perfectly.

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