I am using Form API to create a form on a page and I ask user to submit CSV File which is then process in _submit function for that form. Kindly suggest me a way to add progress bar with Drupal's way. I tried this actually but did not work.

function userop_form_users($form_state) {

  $form['file'] = array(
    '#type' => 'file',
    '#title' => t("Upload CSV file containing information."),
    '#description' => t('<a href="#">Download sample file</a>.<br>Upload a file, allowed extensions: csv'),
    '#ajax' => array(
        'progress' => array('type' => 'bar', 'message' => t('TestMessage'),'interval' => '1500'),

  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit'),

  $form['#cache'] = FALSE;
  return $form;

The easiest way would be to use the managed_file field type and set the #progress_indicator property to 'bar'.

More details are given in this Drupal Answers answer...

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