HiddenField: added setNullable() and addFilter() [Closes #171]

Author: MilanPala

src/Forms/Controls/HiddenField.php

@@ -20,6 +20,9 @@ class HiddenField extends BaseControl
 	/** @var bool */
 	private $persistValue;
 
+	/** @var bool */
+	private $nullable = false;
+
 
 	public function __construct($persistentValue = null)
 	{
@@ -53,6 +56,38 @@ public function setValue($value)
 	}
 
 
+	/**
+	 * Returns control's value.
+	 * @return mixed
+	 */
+	public function getValue()
+	{
+		return $this->nullable && $this->value === '' ? null : $this->value;
+	}
+
+
+	/**
+	 * Sets whether getValue() returns null instead of empty string.
+	 * @return static
+	 */
+	public function setNullable(bool $value = true)
+	{
+		$this->nullable = $value;
+		return $this;
+	}
+
+
+	/**
+	 * Appends input string filter callback.
+	 * @return static
+	 */
+	public function addFilter(callable $filter)
+	{
+		$this->getRules()->addFilter($filter);
+		return $this;
+	}
+
+
 	/**
 	 * Generates control's HTML element.
 	 */

tests/Forms/Controls.HiddenField.loadData.phpt

@@ -74,6 +74,21 @@ test(function () { // object
 });
 
 
+test(function () { // object from string by filter
+	$date = new Nette\Utils\DateTime('2013-07-05');
+	$_POST = ['text' => (string) $date];
+	$form = new Form;
+	$input = $form->addHidden('text');
+	$input->addFilter(function ($value) {
+		return $value ? new \Nette\Utils\DateTime($value) : $value;
+	});
+
+	Assert::same((string) $date, $input->getValue());
+	$input->validate();
+	Assert::equal($date, $input->getValue());
+});
+
+
 test(function () { // int from string
 	$_POST = ['text' => '10'];
 	$form = new Form;
@@ -93,3 +108,21 @@ test(function () { // persistent
 
 	Assert::same('persistent', $input->getValue());
 });
+
+
+test(function () { // nullable
+	$form = new Form;
+	$input = $form->addHidden('hidden');
+	$input->setValue('');
+	$input->setNullable();
+	Assert::null($input->getValue());
+});
+
+
+test(function () { // nullable
+	$form = new Form;
+	$input = $form->addHidden('hidden');
+	$input->setValue(null);
+	$input->setNullable();
+	Assert::null($input->getValue());
+});