Bootstrap dropdown using accordion is not working - angularjs

Question

I am implementing bootstrap dropdown in my Angular application using accordion. When I click on accordion toggle, it is not sliding down and up.
This is my code:
<div class="container-fluid mt100 mr5 ml5">
<div class="row">
<table class='table s12'>
<tr style="background: #e4e9eb;">
<td>Name</td>
<td>Address</td>
<td>City</td>
<td>Edit</td>
<td></td>
</tr>
<tr ng-repeat="listItem in Items">
<td>
{{listItem.name}}
</td>
<td>
{{listItem.address}}
</td>
<td>
{{listItem.city}}
</td>
<td>
<a class="dropdown-toggle" ng-click="isCollapsed = !isCollapsed" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<span class="caret"></span>
</a>
</td>
</tr>
<tr>
<td colspan="3" class="hiddenRow">
<div class="collapse" collapse="isCollapsed">
<table class="table display" style="border-collapse:collapse;">
<thead>
<tr class='pix2' style="background: #e4e9eb;">
<th>First</th>
<th>Second</th>
<th>Third</th>
</tr>
</thead>
<tbody>
<tr ng-repeat='item in listItem.subItems'>
<td>{{item.first}}</td>
<td>{{item.second}}</td>
<td>{{item.third}}</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</table>
</div>
</div>
What is causing the issue?