title: Display button only when option is selected
body: <p>I want my button to display only when one of the options is selected in the select area. </p>
  
  <pre><code>&lt;div class="row" ng-controller='ctrl1'&gt;
          &lt;div class ="form_group"&gt;
              &lt;select class="form-control" ng-options='item as item.hotel_name for item in hotels.data' ng-model='current_Hotel' ng-click="selectHotel()"&gt;&lt;option value="" selected disabled&gt;Choose a hotel&lt;/option&gt;
              &lt;/select&gt;
          &lt;/div&gt;
  
          &lt;div class="col-md-6"&gt;      
              &lt;h1&gt;{{current_Hotel.hotel_name}}&lt;/h1&gt;
              &lt;p&gt;{{current_Hotel.hotel_description}}&lt;/p&gt;
              &lt;img class="img img-responsive" ng-src="{{current_Hotel.image_url}}"&gt;
              &lt;btn class="btn btn-primary"&gt;Book a room &lt;/btn&gt;
          &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I tried using ng-show and ng-hide but it didn't worked as I wanted. </p>