openproject/frontend/app/components/wp-relations/wp-relations-create/wp-relations-autocomplete/wp-relations-autocomplete.template.html

<form name="add_relation_form" class="form">
  <input type="text"
         class="wp-relations--autocomplete"
         ng-model="selectedWp"
         typeahead-append-to-body="true"
         typeahead-on-select="onSelect($model)"
         typeahead-wait-ms="100"
         typeahead-input-formatter="getIdentifier($model)"
         typeahead-is-open="autocompleteIsOpen"
         placeholder="{{ ::text.placeholder }}"
         uib-typeahead="item as getIdentifier(item) for item in autocompleteWorkPackages($viewValue)">
</form>