Show the value of a node-form field inside an AJAX field added via hook_form_alter()
function myresa_callback($form, $form_state) {
  $element = $form[‘box’] ;
  $element[‘#markup’] = «The price for » . $form_element


No wonder this doesn't work, where does $form_element come from? Also fields tend to be structured like $form[field name][$node-&gt;language][columname] (the latter being value in your case IMO)