From 921c3ad847ec085d49c3afdedb4693ef6d2dcc52 Mon Sep 17 00:00:00 2001
From: David Grudl <david@grudl.com>
Date: Mon, 1 Apr 2024 13:46:54 +0200
Subject: [PATCH] RadioList: added setEmptyItem()

---
 src/Forms/Controls/RadioList.php             | 35 +++++++++++++++++++-
 tests/Forms/Controls.RadioList.loadData.phpt | 11 ++++++
 tests/Forms/Controls.RadioList.render.phpt   | 17 ++++++++++
 3 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/src/Forms/Controls/RadioList.php b/src/Forms/Controls/RadioList.php
index a978bbbc..c1b46854 100644
--- a/src/Forms/Controls/RadioList.php
+++ b/src/Forms/Controls/RadioList.php
@@ -27,6 +27,7 @@ class RadioList extends ChoiceControl
 	protected Html $separator;
 	protected Html $container;
 	protected Html $itemLabel;
+	private string|Stringable|false $emptyItem = false;
 
 
 	public function __construct(string|Stringable|null $label = null, ?array $items = null)
@@ -40,6 +41,25 @@ public function __construct(string|Stringable|null $label = null, ?array $items
 	}
 
 
+	/**
+	 * Sets the first N/A item.
+	 */
+	public function setEmptyItem(string|Stringable|false $label): static
+	{
+		$this->emptyItem = $label;
+		return $this;
+	}
+
+
+	/**
+	 * Returns the first N/A item.
+	 */
+	public function getEmptyItem(): string|Stringable|false
+	{
+		return $this->emptyItem;
+	}
+
+
 	public function getControl(): Html
 	{
 		$input = parent::getControl();
@@ -51,12 +71,25 @@ public function getControl(): Html
 			}
 		}
 
+		$selected = $this->value;
+		if ($this->emptyItem !== false) {
+			if ($this->isRequired()) {
+				throw new Nette\InvalidStateException('Required radiolist cannot have empty item.');
+			}
+			$emptyKey = '';
+			while (isset($items[$emptyKey])) {
+				$emptyKey .= "\x1";
+			}
+			$items = [$emptyKey => $this->translate($this->emptyItem)] + $items;
+			$selected ??= $emptyKey;
+		}
+
 		return $this->container->setHtml(
 			Nette\Forms\Helpers::createInputList(
 				$this->translate($items),
 				array_merge($input->attrs, [
 					'id:' => $ids,
-					'checked?' => $this->value,
+					'checked?' => $selected,
 					'disabled:' => $this->disabled,
 					'data-nette-rules:' => [key($items) => $input->attrs['data-nette-rules']],
 				]),
diff --git a/tests/Forms/Controls.RadioList.loadData.phpt b/tests/Forms/Controls.RadioList.loadData.phpt
index 14b24cf0..ba507229 100644
--- a/tests/Forms/Controls.RadioList.loadData.phpt
+++ b/tests/Forms/Controls.RadioList.loadData.phpt
@@ -141,6 +141,17 @@ testException('setValue() and invalid argument', function () use ($series) {
 }, Nette\InvalidArgumentException::class, "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'radio'.");
 
 
+test('empty item selected', function () {
+	$_POST = ['radio' => ''];
+
+	$form = new Form;
+	$input = $form->addRadioList('radio', null, ['a' => 'First'])->setEmptyItem('n/a');
+
+	Assert::true($form->isValid());
+	Assert::null($input->getValue());
+});
+
+
 test('object as value', function () {
 	$form = new Form;
 	$input = $form->addRadioList('radio', null, ['2013-07-05 00:00:00' => 1])
diff --git a/tests/Forms/Controls.RadioList.render.phpt b/tests/Forms/Controls.RadioList.render.phpt
index f43a50cd..d7c1e541 100644
--- a/tests/Forms/Controls.RadioList.render.phpt
+++ b/tests/Forms/Controls.RadioList.render.phpt
@@ -88,6 +88,23 @@ test('Html', function () {
 });
 
 
+test('empty item', function () {
+	$form = new Form;
+	$input = $form->addRadioList('list', 'Label', [
+		'' => 'First',
+	])->setEmptyItem('n/a');
+
+	Assert::same('<label><input type="radio" name="list" checked value="' . "\x01" . '">n/a</label><br><label><input type="radio" name="list" value="">First</label>', (string) $input->getControl());
+
+	$input->setRequired();
+	Assert::exception(
+		fn() => $input->getControl(),
+		Nette\InvalidStateException::class,
+		'Required radiolist cannot have empty item.',
+	);
+});
+
+
 test('validation rules', function () {
 	$form = new Form;
 	$input = $form->addRadioList('list', 'Label', [