Nativescript Vue条件v模板不工作

Nativescript Vue条件v模板不工作,nativescript,nativescript-vue,Nativescript,Nativescript Vue,我有一个列表视图,它呈现以下内容: <ListView v-for="(item, index) in items" height="500"> <v-template v-if="index < items.length - 1"> <GridLayout rows="*, *", columns="220,130,*"> <TextField hint="Project I

我有一个列表视图,它呈现以下内容:

    <ListView v-for="(item, index) in items" height="500">
       <v-template v-if="index < items.length - 1">
          <GridLayout rows="*, *", columns="220,130,*"> 
              <TextField hint="Project Item" row="0" col="0" />
              <TextField hint="Price" row="0" col="1" />
              <Button text="X" row="0" col="2" />
          </GridLayout>
       </v-template>                         

 <!-- render if index reaches last element -->

       <v-template v-if="index == items.length - 1">
          <GridLayout rows="*, *", columns="220,130,*"> 
            <TextField hint="Project Item" row="0" col="0" />
            <TextField hint="Price" row="0" col="1" />
            <Button text="index" row="0" col="2" />
          </GridLayout>
       </v-template>           

    </ListView> 
页面上呈现的是每个元素的值:
1,2,3,1…
在文本字段中,没有在我的代码中定义任何按钮

如何使条件生效?
使用
if
,而不是
v-if
。此外,如果(如上所述),则无法访问中的项目。 此外,您应该使用
for
而不是
v-for

这就是你能做的:

1-将模板更改为:

    <ListView for="(item, index) in listItems" height="500">
       <v-template if="!item.isLast">
          <GridLayout rows="*, *", columns="220,130,*"> 
              <TextField hint="Project Item" row="0" col="0" />
              <TextField hint="Price" row="0" col="1" />
              <Button text="X" row="0" col="2" />
          </GridLayout>
       </v-template>                         

 <!-- render if index reaches last element -->

       <v-template if="!item.isLast">
          <GridLayout rows="*, *", columns="220,130,*"> 
            <TextField hint="Project Item" row="0" col="0" />
            <TextField hint="Price" row="0" col="1" />
            <Button text="index" row="0" col="2" />
          </GridLayout>
       </v-template>           

    </ListView> 

您应该使用
for
而不是
v-for
。另外,对于
ListView
中的索引,有一个默认的
$index
变量,因此您可以按如下方式使用它

<ListView for="item in items" height="500">
   <v-template v-if="$index < items.length - 1">
      <GridLayout rows="*, *", columns="220,130,*"> 
          <TextField hint="Project Item" row="0" col="0" />
          <TextField hint="Price" row="0" col="1" />
          <Button text="X" row="0" col="2" />
      </GridLayout>
   </v-template>                         



你能分享一个游乐场的样本吗?他应该只使用
for
而不是
v-for
computed: {
  listItems() {
    return this.items.map((item, index) => {
      item.isLast = index === items.length - 1;
      return item;
    });
  }
}
<ListView for="item in items" height="500">
   <v-template v-if="$index < items.length - 1">
      <GridLayout rows="*, *", columns="220,130,*"> 
          <TextField hint="Project Item" row="0" col="0" />
          <TextField hint="Price" row="0" col="1" />
          <Button text="X" row="0" col="2" />
      </GridLayout>
   </v-template>                         
   <v-template v-if="$index == items.length - 1">
      <GridLayout rows="*, *", columns="220,130,*"> 
        <TextField hint="Project Item" row="0" col="0" />
        <TextField hint="Price" row="0" col="1" />
        <Button text="index" row="0" col="2" />
      </GridLayout>
   </v-template>           

</ListView>