ambari-web/app/templates/main.hbs

{{!
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
}}

{{#if isClusterDataLoaded}}
  <div id="main-nav">
    <div class="navbar">
      <div class="navbar-inner">
        {{view App.MainMenuView}}
      </div>
    </div>
  </div>
  {{outlet}}
{{/if}}
{{#unless isClusterDataLoaded}}
  <h2>{{t app.loadingPlaceholder}} </h2>
  <div class="progress progress-striped active">
    <div class="bar" {{bindAttr style="controller.clusterDataLoadedPercent"}}></div>
  </div>
{{/unless}}