redash/client/app/components/parameter-settings.html

<div class="modal-header">
    <button type="button" class="close" aria-label="Close" ng-click="$ctrl.close()"><span aria-hidden="true">&times;</span></button>
    <h4 class="modal-title">{{$ctrl.parameter.name}}</h4>
</div>
<div class="modal-body">
    <div class="form">
      <div class="form-group">
        <label>Title</label>
        <input type="text" class="form-control" ng-model="$ctrl.parameter.title">
      </div>
      <div class="form-group">
        <label>Type</label>
        <select ng-model="$ctrl.parameter.type" class="form-control">
          <option value="text">Text</option>
          <option value="number">Number</option>
          <option value="enum">Dropdown List</option>
          <option value="query">Query Based Dropdown List</option>
          <option value="date">Date</option>
          <option value="datetime-local">Date and Time</option>
          <option value="datetime-with-seconds">Date and Time (with seconds)</option>
        </select>
      </div>
      <div class="form-group">
        <label>
          <input type="checkbox" class="form-inline" ng-model="$ctrl.parameter.global">
          Global
        </label>
      </div>
      <div class="form-group" ng-if="$ctrl.parameter.type === 'enum'">
        <label>Dropdown List Values (newline delimited)</label>
        <textarea class="form-control" rows="3" ng-model="$ctrl.parameter.enumOptions"></textarea>
      </div>
      <div class="form-group" ng-if="$ctrl.parameter.type === 'query'">
        <label>Query to load dropdown values from:</label>
        <ui-select ng-model="$ctrl.parameter.queryId" reset-search-input="false">
            <ui-select-match placeholder="Search a query by name">{{$select.selected.name}}</ui-select-match>
            <ui-select-choices repeat="q.id as q in $ctrl.queries"
                               refresh="$ctrl.searchQueries($select.search)"
                               refresh-delay="0">
            <div class="form-group" ng-bind-html="$ctrl.trustAsHtml(q.name | highlight: $select.search)"></div>
            </ui-select-choices>
        </ui-select>
      </div>
    </div>
</div>