Question

i would like to add a class to my html (.complete) with php:

if( get_field('to-do-repeater') )
{
    Add (complete) class to <div class="to-do to-do-wrap"> should be <div class="to-do to-do-wrap complete">
}
else
{
    Do nothing
}

Answer 1

Try this code :

<div class="to-do to-do-wrap<?php echo get_field('to-do-repeater') ? ' complete' : '' ?>"></div>