<!doctype html>
<html ng-app="ui.bootstrap.demo">
  <head>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-animate.js"></script>
    <script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.14.3.js"></script>
    <script src="example.js"></script>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
  </head>
  <body>

<div ng-controller="DropdownCtrl" class="col-md-3">
    <input value="{{selectedValue}}" class="form-control">
    <!-- Single button -->
    <div class="btn-group" uib-dropdown is-open="status.isopen">
      <button id="single-button" type="button" class="btn btn-primary" uib-dropdown-toggle ng-disabled="disabled">
        Button dropdown <span class="caret"></span>
      </button>
      <ul class="uib-dropdown-menu" role="menu" aria-labelledby="single-button">
        <li role="menuitem"><a href="#" ng-click="change($event)">Action</a></li>
        <li role="menuitem"><a href="#" ng-click="change($event)">Another action</a></li>
        <li role="menuitem"><a href="#" ng-click="change($event)">Something else here</a></li>
        <li class="divider"></li>
        <li role="menuitem"><a href="#" ng-click="change($event)">Separated link</a></li>
      </ul>
    </div>

    <script type="text/ng-template" id="dropdown.html">
        <ul class="uib-dropdown-menu" role="menu" aria-labelledby="button-template-url">
          <li role="menuitem"><a href="#">Action in Template</a></li>
          <li role="menuitem"><a href="#">Another action in Template</a></li>
          <li role="menuitem"><a href="#">Something else here</a></li>
          <li class="divider"></li>
          <li role="menuitem"><a href="#">Separated link in Template</a></li>
        </ul>
    </script>
</div>
  </body>
</html>
angular.module('ui.bootstrap.demo', ['ngAnimate', 'ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('DropdownCtrl', function ($scope, $log) {
  $scope.items = [
    'The first choice!',
    'And another choice for you.',
    'but wait! A third!'
  ];

  $scope.status = {
    isopen: false
  };
  $scope.selectedValue = 0;
  $scope.change = function(arg) {
    $scope.selectedValue = arg.target.textContent;
  }
});
# Bootstrap Dropdown AngularJs as combobox
Simple showls how to handle dropdown click as value change in AngularJs
Based on http://angular-ui.github.io/bootstrap/ demo