diff --git a/core/lib/Drupal/Core/Render/Element/Radio.php b/core/lib/Drupal/Core/Render/Element/Radio.php
index 8687a9d..d7f2607 100644
--- a/core/lib/Drupal/Core/Render/Element/Radio.php
+++ b/core/lib/Drupal/Core/Render/Element/Radio.php
@@ -37,6 +37,22 @@ public function getInfo() {
];
}
+ /**
+ * Casts passed boolean and integer values to string type.
+ *
+ * @param mixed $value
+ * A value to cast.
+ *
+ * @return mixed
+ * The cast value of the parameter.
+ */
+ protected static function castValue($value) {
+ if (is_bool($value) || (int) (bool) $value === (int) $value) {
+ return (string) (int) $value;
+ }
+ return $value;
+ }
+
/**
* Prepares a #type 'radio' render element for input.html.twig.
*
@@ -54,8 +70,16 @@ public static function preRenderRadio($element) {
$element['#attributes']['type'] = 'radio';
Element::setAttributes($element, ['id', 'name', '#return_value' => 'value']);
- if (isset($element['#return_value']) && $element['#value'] !== FALSE && $element['#value'] == $element['#return_value']) {
- $element['#attributes']['checked'] = 'checked';
+ if (isset($element['#return_value']) && $element['#value'] !== FALSE) {
+ // To avoid auto-casting during '==' we convert int 0 to '0' for both
+ // operands. It will prevent wrong true-checking for both cases: 0 ==
+ // 'string' and 'string' == 0.
+ $element['#value'] = static::castValue($element['#value']);
+ $element['#return_value'] = static::castValue($element['#return_value']);
+
+ if ($element['#value'] == $element['#return_value']) {
+ $element['#attributes']['checked'] = 'checked';
+ }
}
static::setAttributes($element, ['form-radio']);
diff --git a/core/modules/system/src/Tests/Form/ElementTest.php b/core/modules/system/src/Tests/Form/ElementTest.php
index 0e1c3ce..75de8c8 100644
--- a/core/modules/system/src/Tests/Form/ElementTest.php
+++ b/core/modules/system/src/Tests/Form/ElementTest.php
@@ -89,6 +89,26 @@ public function testOptions() {
}
/**
+ * Tests correct checked attribute for radios element.
+ */
+ public function testRadiosChecked() {
+ // Verify that there is only one radio option checked.
+ $this->drupalGet('form-test/radios-checked');
+ $elements = $this->xpath('//input[@name="radios" and @checked]');
+ $this->assertEqual(count($elements), 1);
+ $this->assertIdentical((string) $elements[0]['value'], '0');
+ $elements = $this->xpath('//input[@name="radios-string" and @checked]');
+ $this->assertEqual(count($elements), 1);
+ $this->assertIdentical((string) $elements[0]['value'], 'bar');
+ $elements = $this->xpath('//input[@name="radios-boolean-true" and @checked]');
+ $this->assertEqual(count($elements), 1);
+ $this->assertIdentical((string) $elements[0]['value'], '1');
+ // A default value of FALSE indicates that nothing is set.
+ $elements = $this->xpath('//input[@name="radios-boolean-false" and @checked]');
+ $this->assertEqual(count($elements), 0);
+ }
+
+ /**
* Tests wrapper ids for checkboxes and radios.
*/
public function testWrapperIds() {
diff --git a/core/modules/system/tests/modules/form_test/form_test.routing.yml b/core/modules/system/tests/modules/form_test/form_test.routing.yml
index 2250a0b..0ee125c 100644
--- a/core/modules/system/tests/modules/form_test/form_test.routing.yml
+++ b/core/modules/system/tests/modules/form_test/form_test.routing.yml
@@ -294,6 +294,14 @@ form_test.checkboxes_radios:
requirements:
_access: 'TRUE'
+form_test.radios_checked:
+ path: '/form-test/radios-checked'
+ defaults:
+ _form: '\Drupal\form_test\Form\FormTestRadiosCheckedForm'
+ _title: 'Radios checked defalt value'
+ requirements:
+ _access: 'TRUE'
+
form_test.email:
path: '/form-test/email'
defaults:
diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php
new file mode 100644
index 0000000..75b52d5
--- /dev/null
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php
@@ -0,0 +1,82 @@
+ 'radios',
+ '#title' => 'Radios',
+ '#options' => [
+ 0 => 'Zero',
+ 'foo' => 'Foo',
+ 1 => 'One',
+ 'bar' => 'Bar - radios',
+ '>' => "Special Char",
+ ],
+ '#default_value' => 0,
+ ];
+ $form['radios-string'] = [
+ '#type' => 'radios',
+ '#title' => 'Radios',
+ '#options' => [
+ 0 => 'Zero',
+ 'foo' => 'Foo',
+ 1 => 'One',
+ 'bar' => 'Bar - radios',
+ '>' => "Special Char",
+ ],
+ '#default_value' => 'bar',
+ ];
+ $form['radios-boolean-true'] = [
+ '#type' => 'radios',
+ '#title' => 'Radios',
+ '#options' => [
+ 'All' => '- Any -',
+ 1 => 'True',
+ 0 => 'False',
+ ],
+ '#default_value' => TRUE,
+ ];
+ $form['radios-boolean-false'] = [
+ '#type' => 'radios',
+ '#title' => 'Radios',
+ '#options' => [
+ 'All' => '- Any -',
+ 1 => 'True',
+ 0 => 'False',
+ ],
+ '#default_value' => FALSE,
+ ];
+
+ $form['submit'] = ['#type' => 'submit', '#value' => 'Submit'];
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $form_state->setResponse(new JsonResponse($form_state->getValues()));
+ }
+
+}