ambari/ambari-web/app/templates/installer/step1.hbs

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<h2>{{t installer.step1.body.header}}</h2>
<p class="alert alert-info">
  {{t installer.step1.body}}
</p>
<div {{bindAttr class="view.onError:error :control-group"}}>
  <label class="control-label" for="cluster-name">{{t installer.step1.clusterName}}
    <a href="javascript:void(null)"
       rel="popover"
      {{translateAttr title="installer.step1.clusterName.tooltip.title"
       data-content="installer.step1.clusterName.tooltip.content"}}>Learn more</a>
  </label>

  <div class="controls">
    {{view Ember.TextField id="cluster-name" valueBinding="clusterName" placeholder="cluster name" target="controller"}}
    <p class="help-inline">{{clusterNameError}}</p>
  </div>
</div>

<div class="btn-area">
  <a class="btn btn-success pull-right" {{bindAttr disabled= "invalidClusterName"}} {{action "submit" target="controller"}}>Next &rarr;</a>
</div>