Type in your title and then click on the Submit button.$form = return $form } public function setMessage ( array $form, FormStateInterface $form_state ) Test the input form $form =, ] // Placeholder to put the result of Ajax call, setMessage(). 'textfield', '#title' => $this -> t ( 'Title' ), '#description' => $this -> t ( 'Title must be at least 15 characters in length.' ), '#required' => TRUE, ] // Attach Ajax callback to the Submit button. More information on callbacks is below in 'Setting up a callback to process Ajax'. Here are the details of its elements, all of which are optional: callback: The callback to invoke to handle the server side of the Ajax event. Using curl to query Drupal 8 web service As you can see from this example, the ajax property for a form element is an array. Drupal 8 - Simple example using Batch API to delete Article nodes.Please advice me I created a webform by webform module.My aim is to submit the form without the page load. Drupal 8 - Run Javascript & CSS from form These are my code, I have done the form alter in template.php.
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