tdoumas

// Greek Tax Registration Number Validation (AFM)
// Αλγόριθμος ορθότητας ΑΦΜ
function validateAFM(afm) {
    if (!afm.match(/^\d{9}$/) || afm == '000000000')
        return false;

    var m = 1, sum = 0;
    for (var i = 7; i >= 0; i--) {
        m *= 2;
        sum += afm.charAt(i) * m;

chrisjhoughton

var waitForEl = function(selector, callback) {
  if (jQuery(selector).length) {
    callback();
  } else {
    setTimeout(function() {
      waitForEl(selector, callback);
    }, 100);
  }
};

lirenyeo

Bootstrap 4 Utilities Cheatsheet

Media Queries

1. up

Bootstrap 4 Mixins	Compiled into
@include media-breakpoint-up(xs)	@media (min-width: 0px)
@include media-breakpoint-up(sm)	@media (min-width: 576px)
@include media-breakpoint-up(md)	@media (min-width: 768px)