Expand/collapse odd row in AngularJs - angularjs

Question

I want to expand/collapse a row, I want to hide all odd rows and on clicking '+' button those hidden row should get visible, my current code is allowing me hide all the odd rows but on clicking '+' button all row are getting visible, my use case is to show only the odd row which is next to clicked even row.
<table class="table table-bordered">
<thead>
<tr>
<th></th>
<th>Name</th>
<th>Type</th>
</tr>
</thead>
<tbody ng-repeat="test in ctrl.SearchResults">
<tr ng-if="$even">
<td>
<button ng-click="ctrl.expanded = !ctrl.expanded" expand>
<span ng-bind="ctrl.expanded ? '-' : '+'"></span>
</button></td>
<td>{{test.apName}}</td>
<td>{{test.type}}</td>
</tr>
<tr ng-show="ctrl.expanded" ng-if="$odd">
<td></td>
<td>{{test.apName}}</td>
<td>{{test.type}}</td>
</tr>
</tbody>
</table>

Answer 1

The reason all the rows expand when you hit the plus, is that the variable expanded is on the controller. So all the rows are 'listening' to the same variable.
As atfornes pointed out in his answer, you could use the $index to identify each row. Another solution is to keep track of the current index on the controller and check for per row if he must be showed:
<tr ng-show="ctrl.expanded == $index" ng-if="$odd">
And on the click event of the plus sign you could have
ctrl.expanded = $index
Or you could handle this in the controller. In this case you can create a method on the controller which accepts the index and then set this index value to the controller's variable expanded.

Answer 2

At the button ng-click code, you could store the current $index with a code like:
<button ng-click="ctrl.expanded = !ctrl.expanded; ctrl.index = $index" expand>
then, you can change the ng-show condition to only display the item if ctrl.expanded and $index === ctrl.index + 1:
<tr ng-show="ctrl.expanded && $index === ctrl.index +1" ng-if="$odd">