I found that there is a way to add javascript files in the form validation function as stated in "drupal_add_js not work in form validation failed".
However, I would like to know how to add javascript using the drupal_add_js function with the inline option. I would just like to execute some javascript code while I am in the validation function of the Drupal Form API.
See the docs @https://www.drupal.org/docs/7/api/javascript-api/managing-javascript-in-drupal-7
drupal_add_js() example:
drupal_add_js( 'jQuery(document).ready(function () { alert("Hello!"); });', array( 'type' => 'inline', 'scope' => 'footer', 'group' => JS_THEME, 'weight' => 5, ) );#attached example:
$element['#attached']['js'][] = array( 'type' => 'inline', 'data' => 'jQuery(document).ready(function () { alert("Hello!"); });', 'scope' => 'footer', 'group' => JS_THEME, 'weight' => 5, );
Just replace $element by $form.
Original source: https://web.archive.org/web/20160502205421/http://www.failover.co/snippets/drupal-7-attaching-css-and-javascript-forms-or-form-elements
Use the #attached property to add your JS file instead of drupal_add_js function
More info: FAPI #attached
