Increment or Decrement number of Fields Dynamically using Form API and Ajax
In this example, we will use a field to get tags list, the number of tags dynamic.
Form
Taxonomy form autocomplete, Create taxonomy term field with FAPI
Simple taxonomy autocomplete field.
Example:$form['tagtest'] = [
'#type' => 'entity_autocomplete',
'#target_type' => 'taxonomy_term',
'#title' => 'Taxonomy Term',
];
Autocomplete function for textfield of Form API
First, Create autocomplete controller and the route
Example of the controller : DefaultController.php
<?php
namespace Drupal\mymodule\Controller;
Avoid Spam form submissions - (Easy way of form Anti-Spam)
Method 1. (Classical way)
Use a captcha system like Math captcha, Image captcha, reCaptcha of google....
Add a Form in to a Basic Controller
NOTE: I don't know this is the best practice, anyway it's working !!!.
Tips for Form API of Drupal 8
Add html after a field
(#field_prefix and #field_suffix).
Add Remove Fields Dynamically using Form API and Ajax
Example: Add/Remove 'test' Field depending on 'switch' field
Form redirection on submit
Example : (Insert this line in to your form submitForm() methode)
Redirect to the user page ( Redirection on form submit)$form_state->setRedirect('user.page');
Show a Form on another page
Example : Display user login form on a page
$output = array();
$output['cache']['#disabled'] = TRUE;
$output['cache']['max_age']['#value'] = 0;