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I have webform created via Webform UI, and it's multi-step webform.

In second step ('personal information') I add custom button using HOOK_form_alter with following code

'generate_pdf' => [
    '#type' => 'submit',
    '#value' => t('Generate PDF'),
    '#limit_validation_errors' => [],
    '#submit' => ['generate_pdf_template'],
]

function generate_pdf_template takes values from $form, $form_state inserts them into twig templat, creates PDF and automatically downloads it.

My issue is, that this generate_pdf button submits the form and user is not able to send form via original submit button. Can I somehow prevent submission when generate_pdf is clicked so user can download PDF and still be able to send webform with original button and webform's handlers.

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Something like this may work.

#name and #submit are required.

The name makes sure the button does not get confused with other submit buttons.

The #submit value calls a custom function you have to create.

#limit_validation_errors prevents form validation, which may or may not be useful.

  $form['generate_pdf'] = [
    '#type' => 'submit',
    '#value' => $this->t('Generate PDF'),
    '#name' => 'generatepdf',
    '#submit' => ['::generatepdf'],
    '#limit_validation_errors' => array(),
  ];
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