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I follow this useful howto by Tom Constant on how to add image submit buttons on Drupal forms. Since I got a JavaScript error on drupal.js (line 31: button is undefined), I rewrite Tom’s implementation, and now it works fine on Drupal 10:
this useful howto by Tom Constant
function phptemplate_button($element) { // Make sure not to overwrite classes. if (isset($element['#attributes']['class'])) { $element['#attributes']['class'] = 'form-'. $element['#button_type'] .' '. $element['#attributes']['class']; } else { $element['#attributes']['class'] = 'form-'. $element['#button_type']; } // here the novelty begins: check if #button_type is normal submit // button or image button switch($element['#button_type']) { case 'image': $button_type = 'image'; break; default: $button_type = 'submit'; break; } return '<input id="'. $element['#id'].'" name="'. $element['#name'] .'" type="' . $button_type . '" value="'. check_plain($element['#value']) .'" />