Reply To: Using acf/validate_value to validate repeater field

• ituk

• September 23, 2016 at 9:09 pm

although this is old, for those who look for a good solution for this issue of validating the first row’s fields in a repeater, here is what I just figured out:

//validate first step
add_filter('acf/validate_value/key=field_57bc841e7f973', 'itamar_acf_validate_value__fs', 10, 4);
function itamar_acf_validate_value__fs( $valid, $value, $field, $input ){
	
	// bail early if value is already invalid
	if( !$valid ) {
		return $valid;
	}

 	// load data
	$repeater_field = $_POST['acf']['field_57bc841e7f973']; //repater parent key
	reset($repeater_field); //reset repeater array to the rist row
	$first_field = key($repeater_field); //get first key in the repeater array
	$my_text_field = $_POST['acf']['field_57bc841e7f973'][$first_field]['field_57bc8a5447d06']; //specific field
	$characters = mb_strlen($my_text_field, 'utf-8');
	if ( $characters < 100 ) {
		$valid = 'כתבת '.$characters.' תווים בלבד בתוכן השלב הראשון. עליך לכתוב לפחות 100 תווים.';
	} 
		
	// return
	return $valid; 
}

in this case the validation is for a specific field under the first row in a specific repeater. you can change the characters count to 1 and then you get a real “required” field.