diff --git a/core/lib/Drupal/Core/Form/FormBuilder.php b/core/lib/Drupal/Core/Form/FormBuilder.php
index df716e3..5ff1db9 100644
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -561,6 +561,23 @@ public function processForm($form_id, &$form, FormStateInterface &$form_state) {
     $unprocessed_form = $form;
     $form = $this->doBuildForm($form_id, $form, $form_state);
 
+    // Allow an ajax callback while the form is operating in GET mode.
+    // For example when using HOOK_form_views_exposed_form_alter.
+    if ($form_state->isMethodType('get')) {
+      $triggered = $this->requestStack->getCurrentRequest()->request->get('_triggering_element_name');
+      if ($triggered && isset($form[$triggered]) && isset($form[$triggered]['#ajax'])) {
+        $form_state->setTriggeringElement($form[$triggered]);
+        throw new FormAjaxException($form, $form_state);
+      }
+      //Allow an ajax callback on Page views.
+      if (isset($form['secondary'])) {
+        if ($triggered && isset($form['secondary'][$triggered]) && isset($form['secondary'][$triggered]['#ajax'])) {
+          $form_state->setTriggeringElement($form['secondary'][$triggered]);
+          throw new FormAjaxException($form, $form_state);
+        }
+      }
+    }
+
     // Only process the input if we have a correct form submission.
     if ($form_state->isProcessingInput()) {
       // Form values for programmed form submissions typically do not include a
diff --git a/core/modules/views/src/ViewExecutable.php b/core/modules/views/src/ViewExecutable.php
index 9ee3704..91a3fe1 100644
--- a/core/modules/views/src/ViewExecutable.php
+++ b/core/modules/views/src/ViewExecutable.php
@@ -689,7 +689,8 @@ public function getExposedInput() {
       // Ensure that we can call the method at any point in time.
       $this->initDisplay();
 
-      $this->exposed_input = \Drupal::request()->query->all();
+      $request = \Drupal::request();
+      $this->exposed_input = $request->isMethod('get') ? $request->query->all() : $request->request->all();
       // unset items that are definitely not our input:
       foreach (['page', 'q'] as $key) {
         if (isset($this->exposed_input[$key])) {
diff --git a/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php b/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
index 0ab4277..8b804d7 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
@@ -19,7 +19,13 @@ class ExposedFilterAJAXTest extends WebDriverTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_test_modal'];
+  public static $modules = ['node', 'views', 'views_test_modal', 'views_test_config'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $testViews = ['test_content_ajax'];
+
 
   /**
    * {@inheritdoc}
@@ -146,4 +152,36 @@ public function testExposedFiltersInModal() {
     $this->assertNotContains('Page Two', $html);
   }
 
+  /**
+   * Tests if AJAX events can be attached to the exposed filter form.
+   */
+  public function testExposedFilterAjaxCallback() {
+    ViewTestData::createTestViews(self::class, ['views_test_config']);
+
+    // Attach an AJAX event to all 'title' fields in the exposed filter form.
+    \Drupal::service('module_installer')->install(['views_test_exposed_filter']);
+    $this->resetAll();
+    $this->rebuildContainer();
+    $this->container->get('module_handler')->reload();
+
+    // Create a user privileged enough to view content.
+    $user = $this->drupalCreateUser([
+      'administer site configuration',
+      'access content',
+      'access content overview',
+    ]);
+    $this->drupalLogin($user);
+
+    $this->drupalGet('test-content-ajax');
+
+    $page = $this->getSession()->getPage();
+    $this->assertSession()->pageTextContains('Default prefix');
+
+    $page->fillField('title', 'value');
+    $this->assertSession()->assertWaitOnAjaxRequest();
+
+    $this->assertSession()->pageTextContains('Callback called.');
+  }
+
 }
+