I have this text box element.
<input type="text" name="textbox" class="box-input ng-pristine ng-scope md-input ng-empty ng-valid ng-valid-required ng-touched" ng-required="field.required" ng-model="$ctrl.model[field.nameField.uuid]" ng-disabled="::field.readOnly" id="input_15" aria-invalid="false" style="">
In protractor how should I use it to locate the element? I am not quite sure how to use ng-model="$ctrl.model[field.nameField.uuid]"