Question

How would I use the following code to run a function on any div with the class of .p11button which also has display:block?

if (VARIABLE = true) {
    $('div .p11-button').css('display') == 'block'
    FUNCTION HERE
}

Answer 1

Try the following:

if (VARIABLE) {
  $('div.p11-button').filter(function() {
   return $(this).css('display' === 'block');
  }).each(function() {
    var self = $(this);
    //FUNCTION HERE
  });
}

In your code example you were assigning variable to true in the condition – this would always evaluate to true! Also, the space in your selector means you will select descendents of divs with class p11-button.