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After Build use in Drupal

/ Published in: PHP
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  1. function yourmodulename_form_alter(&$form, $form_state, $form_id) {
  2.   if($form_id == 'thisformid'){
  3.     $form['field']['#prefix'] = 'This text gets overwritten by the after build'; 
  4.     $form['#after_build'][] = 'yourmodulename_after_build'; //Calls function
  5.     //drupal_add_css('hello.css'); This line does not work when validation fails
  6.   }
  7. }
  8.  
  9. function yourmodulename_after_build($form, &$form_state) {
  10.   $form['field']['#prefix'] = 'This text will rule them all!'; 
  11.   drupal_add_css('hello.css'); //This line works even after validation fails.
  12.   return $form;
  13. }

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