grafana/panels/stringquery/module.html

<div ng-controller='stringquery'>
  <h4 ng-hide="_.isUndefined(panel.title)">{{panel.title}}</h4>
    <form class="form-search">
      <input type="text" class="input-medium search-query" ng-model="query" style="width:90%">
      <button type="submit" class="btn" ng-click="send_query(query)">Search</button>
    </form>
</div>