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Get a field value before Save

  • Hello,

    I would like to be able to read a field value before saving the form to apply it in another field in an acf_form

    I have a “starting_date” date field and an “ending_date” date field for events.
    In case “ending_date” is emplty, I would like to copy “starting_date” value in “ending_date” field.

    I’m pretty sure I’ll get a solution with an “update_value” filter function. I can set a value to a field, but I didn’t found any solution in documentation to get a field value before saving in a acf_form.

    Do you have any clue by chance ?


  • it was easy in fact, even if getting field value is easier after the save of the post 🙂

    function argu19_set_ending_date_if_empty( $post_id ) {
    	if ( !isset($_POST['acf']['field_5bd0266e9f955']) ) :
    		$value = get_field('event_startingdate');
    		update_field('event_endingdate', $value);
    // Apply to all fields.
    add_filter('acf/save_post', 'argu19_set_ending_date_if_empty', 10, 3);
  • Thank you for this thread!

    The strangest thing –
    I can see the field updated only after I refresh the page….
    Any Idea?

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