I am setting another webform on Drupal 8. I want to enable some fields based on the day of the week selected. I used JS on a site with Drupal 7, it is working fine, thanks to JSDrupal.

I would like to implement it on the Drupal 8 site with a regexp. I am using the HTML5 date field, not the Jquery datepicker. My concern is the same than before :

if the Day selected on field DATE_D( a Date field) is Tuesday OR Thursday then hide SELECT( select field).

Thank you


The Webform module for Drupal 8 supports patterns in the #states API (aka Conditional logic).

Example of pattern in conditional logic

  • Thanks for the tip. Sorry for the delay, had a busy day with students. But i am not using a select, i am using the HTML5 datepicker ( not jquery). It is not working with it or do i need to do additional things ? May 7 '18 at 22:10
  • You would have to write custom JS and PHP and calculate the day of the week and then conditionally hide/show the element
    – jrockowitz
    May 7 '18 at 22:29
  • Thank you. So bottom line is, I have to use a select or write custom js and PHP. Thank for your help May 7 '18 at 22:31

I doubt that you can achieve this without some JS involved.

You can use JS RegExp.

You could try Form API #states and try to hide the desired select field if some other field's value matches your conditions.

$form['my_select_element'] = [
  '#type' => 'select',
  '#states' => [
    // Hide this field when the 'weekday' radio has 'tuesday' or 'thursday' selected.
    'invisible' => [
      ':input[name="field_weekday[und]"]' => ['value' => 'tuesday'],
      ':input[name="field_weekday[und]"]' => ['value' => 'thursday'],

(#states with multiple conditions, Source.)

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