silverstripe-framework/forms/LookupField.php

<?php
use SilverStripe\Model\FieldType\DBField;

use SilverStripe\ORM\DataObjectInterface;

/**
 * Read-only complement of {@link DropdownField}.
 *
 * Shows the "human value" of the dropdown field for the currently selected
 * value.
 *
 * @package forms
 * @subpackage fields-basic
 */
class LookupField extends MultiSelectField {

	/**
	 * @var boolean $readonly
	 */
	protected $readonly = true;

	/**
	 * Returns a readonly span containing the correct value.
	 *
	 * @param array $properties
	 *
	 * @return string
	 */
	public function Field($properties = array()) {
		$source = ArrayLib::flatten($this->getSource());
		$values = $this->getValueArray();

		// Get selected values
		$mapped = array();
		foreach($values as $value) {
			if(isset($source[$value])) {
				$mapped[] = $source[$value];
			}
		}

		// Don't check if string arguments are matching against the source,
		// as they might be generated HTML diff views instead of the actual values
		if($this->value && is_string($this->value) && empty($mapped)) {
			$mapped = array(trim($this->value));
			$values = array();
		}

		if($mapped) {
			$attrValue = implode(', ', array_values($mapped));

			$attrValue = Convert::raw2xml($attrValue);
			$inputValue = implode(', ', array_values($values));
		} else {
			$attrValue = '<i>('._t('FormField.NONE', 'none').')</i>';
			$inputValue = '';
		}

		$properties = array_merge($properties, array(
			'AttrValue' => DBField::create_field('HTMLFragment', $attrValue),
			'InputValue' => $inputValue
		));

		return parent::Field($properties);
	}

	/**
	 * Ignore validation as the field is readonly
	 *
	 * @param Validator $validator
	 * @return bool
	 */
	public function validate($validator) {
		return true;
	}

	/**
	 * Stubbed so invalid data doesn't save into the DB
	 *
	 * @param DataObjectInterface $record DataObject to save data into
	 */
	public function saveInto(DataObjectInterface $record) {
	}

	/**
	 * @return LookupField
	 */
	public function performReadonlyTransformation() {
		$clone = clone $this;
		return $clone;
	}

	public function getHasEmptyDefault() {
		return false;
	}

	/**
	 * @return string
	 */
	public function Type() {
		return "lookup readonly";
	}
}