openproject/public/templates/components/toggled_multiselect.html

<div>
  <select ng-show="!isMultiselect"
          name="v_{{name}}"
          ng-model="values"
          id="values-{{name}}"
          class="select-small"
          style="vertical-align: top;"
          ng-options="value[1] as value[0] for value in availableFilterValues"
          require/>

  <select multiple
          ng-show="isMultiselect"
          name="v_{{name}}"
          ng-model="values"
          id="values-{{name}}"
          class="select-small"
          style="vertical-align: top;"
          ng-options="value[1] as value[0] for value in availableFilterValues"
          require/>

  <a alt="Toggle multiselect" href="#" style="vertical-align: bottom;" title="Toggle multiselect" ng-click="toggleMultiselect()">
    <img alt="Bullet_toggle_plus" src="/assets/bullet_toggle_plus.png"/>
  </a>
</div>