anchor.diff:  
         <div class="modal-body">
           <label class="control-label"><%= t('ec2_instances.protocol') %></label>
  -        <select v-model="protocol" v-on="change: change_listener_protocol()" class="form-control">
  -          <option value="HTTP">HTTP</option>
  -          <option value="HTTPS">HTTPS(Secure HTTP)</option>
  -          <option value="TCP">TCP</option>
  -          <option value="SSL">SSL(Secure TCP)</option>
  -        </select>
  -      </div>
  -      
  +        <select v-model="protocol" @change="change_listener_protocol()" class="form-control">
  +          <option value="HTTP">HTTP</option>
  +          <option value="HTTPS">HTTPS(Secure HTTP)</option>
  +          <option value="TCP">TCP</option>
  +          <option value="SSL">SSL(Secure TCP)</option>
  +        </select>
  +      </div>
  +
         <div class="modal-body">
           <label class="control-label"><%= t('ec2_instances.lb_port') %></label>
           <input type="number" min="0" max="65535" v-model="load_balancer_port" class="form-control" />
         </div>
  -      
  +
         <div class="modal-body">
           <label class="control-label"><%= t('ec2_instances.instance_protocol') %></label>
           <select v-model="instance_protocol" class="form-control">
  
positive.code: 
        <div class="modal-body">
          <label class="control-label"><%= t('ec2_instances.protocol') %></label>
          <select v-model="protocol" v-on="change: change_listener_protocol()" id="edit_listener_protocol" class="form-control">
            <option value="HTTP">HTTP</option>
            <option value="HTTPS">HTTPS(Secure HTTP)</option>
            <option value="TCP">TCP</option>
            <option value="SSL">SSL(Secure TCP)</option>
          </select>
        </div>
        
        <div class="modal-body">
          <label class="control-label"><%= t('ec2_instances.lb_port') %></label>
          <input type="number" min="0" max="65535" v-model="load_balancer_port" id="edit_listener_load_balancer_port" class="form-control" />
        </div>
        
        <div class="modal-body">
          <label class="control-label"><%= t('ec2_instances.instance_protocol') %></label>
          <select v-model="instance_protocol" id="edit_listener_instance_protocol" class="form-control">
  
negative.code: 
  <div class="col-sm-12">
    <h4 class="page-header">DNS name</h4>
    <a :href="'http://' + dns_name" target="_blank">{{dns_name}}</a>
  
    <h4 class="page-header"><%=t('ec2_instances.listeners')%></h4>
    <table class="table table-striped">
  