getTitleField(); $items = $this->getItems(); $titleArray = []; foreach ($items as $item) { $titleArray[] = $item->$titleField; } $titleList = implode(", ", $titleArray); // Build list of values $itemIDs = []; foreach ($items as $item) { $itemIDs[] = $item->ID; } $itemIDsList = implode(",", $itemIDs); // Readonly field for display $field = new ReadonlyField($this->name . '_ReadonlyValue', $this->title); $field->setValue($titleList); $field->setForm($this->form); // Store values to hidden field $valueField = new HiddenField($this->name); $valueField->setValue($itemIDsList); $valueField->setForm($this->form); return $field->Field() . $valueField->Field(); } }