portainer/app/docker/components/imageRegistry/porImageRegistry.html

<div class="form-group">
  <label for="image_name" ng-class="$ctrl.labelClass" class="control-label text-left">Image</label>
  <div ng-class="$ctrl.inputClass">
    <input type="text" class="form-control" uib-typeahead="image for image in $ctrl.availableImages | filter:$viewValue | limitTo:5"
      ng-model="$ctrl.image" name="image_name" placeholder="e.g. myImage:myTag" required>
  </div>
  <label for="image_registry" class="margin-sm-top control-label text-right" ng-class="$ctrl.labelClass">
    Registry
  </label>
  <div ng-class="$ctrl.inputClass" class="margin-sm-top">
    <select ng-options="registry as registry.Name for registry in $ctrl.availableRegistries" ng-model="$ctrl.registry" id="image_registry"
      class="form-control"></select>
  </div>
</div>
<div class="form-group" ng-show="$ctrl.form.image_name.$invalid">
  <div class="col-sm-12 small text-warning">
    <div ng-messages="$ctrl.form.image_name.$error">
      <p ng-message="required"><i class="fa fa-exclamation-triangle" aria-hidden="true"></i> Image name is required.</p>
    </div>
  </div>
</div>