如何访问和使用ng-repeat中每个项目的索引

I have a table where the last column in each row contains a little loading icon which I would like to display when a button inside the table is clicked.

我有一个表，其中每行的最后一列包含一个小的加载图标，当我点击表格中的按钮时，我想显示该图标。

When each table row is generated with ng-repeat, the loader shows up in every row rather than the individual one. How can I set ng-show to true or false for only the current index clicked?

当使用ng-repeat生成每个表行时，加载器将显示在每一行而不是单独的一行中。如何仅针对当前单击的索引将ng-show设置为true或false？

Template:

模板：

<tr ng-repeat="record in records">
  <td>{{ record.name }}</td>
  <td><a ng-click="someAction(record.name)">Some Action</a></td>
  <td ng-show="loading">Loading...</td>
</tr>

Controller:

控制器：

$scope.someAction = function(recordName) {
  $scope.loading = true;
};

3 个解决方案

#1

You can pass in the $index parameter and set/use the corresponding index. $index is automatically available in the scope of an ng-repeat.

您可以传入$ index参数并设置/使用相应的索引。 $ index在ng-repeat范围内自动可用。

<td><a ng-click="someAction(record.name, $index)">Some Action</a></td>
<td ng-show="loading[$index]">Loading...</td>


$scope.someAction = function(recordName, $index) {
  $scope.loading[$index] = true;
};

Here's a generic sample with all the logic in the view for convenience: Live demo (click).

这是一个通用示例，为方便起见，视图中包含所有逻辑：现场演示（单击）。

<div ng-repeat="foo in ['a','b','c']" ng-init="loading=[]">
  <p ng-click="loading[$index]=true">Click me! Item Value: {{foo}}<p>
  <p ng-show="loading[$index]">Item {{$index}} loading...</p>
</div>

#2

There are many ways to handle this.

有很多方法可以解决这个问题。

The problem here is that your variable loading is sharing the scope between the rows.

这里的问题是你的变量加载是在行之间共享范围。

One approach could be use $index

一种方法可以是使用$ index

HTML

HTML

<tr ng-repeat="record in records">
    <td>{{ record.name }}</td>
    <td><a ng-click="someAction(record.name, $index)">Some Action</a></td>
    <td ng-show="loading">Loading...</td>
</tr>

JS

JS

$scope.someAction = function(recordName, $index) {
    $scope.loading[$index] = true;
};

Using a property in your object record:

在对象记录中使用属性：

HTML

HTML

<tr ng-repeat="record in records">
    <td>{{ record.name }}</td>
    <td><a ng-click="someAction(record)">Some Action</a></td>
    <td ng-show="record.loading">Loading...</td>
</tr>

JS

JS

$scope.someAction = function(record) {
   var name = record.name; 
   record.loading = true;
};

Best regards

最好的祝福

#3

The scope inside ng-repeat is different form the one outside. Actually the scope outside ng-repeat is the parent of the one inside. So the html code goes here

ng-repeat中的范围与外部的范围不同。实际上，ng-repeat之外的范围是内部范围的父级。所以html代码就在这里

<tr ng-repeat="record in records">
    <td>{{ record.name }}</td>
    <td><a ng-click="someAction(record)">Some Action</a></td>
    <td ng-show="$parent.loading">Loading...</td>
</tr>