function rafAsync() {
    return new Promise(resolve => {
        requestAnimationFrame(resolve); //faster than set time out
    });
}


function checkElement(selector)	{
	if (document.querySelector(selector) === null) {
		return rafAsync().then(() => checkElement(selector));
	} else {
		return Promise.resolve(true);
	}
}

var slideIndex = 1;
var slideIndex2 = 1;
var slideIndex3 = 1;

function stop_vids() {
	for (var video of document.querySelectorAll("video")) {
    	video.pause();
	}
}


// Next/previous controls
function plusSlides(n, className = "mySlides", counter = "slideIndex", dotclass = "dot") {
  console.log("changing slides");
  showSlides(window[counter] += n, className, counter, dotclass);
  stop_vids();
}

// Thumbnail image controls
function currentSlide(n, className = "mySlides", counter = "slideIndex", dotclass = "dot") {
  showSlides(window[counter] = n, className, counter, dotclass);
  stop_vids()
}

function showSlides(n, className = "mySlides", counter = "slideIndex", dotclass = "dot") {
  var i;
  var slides = document.getElementsByClassName(className);
  var dots = document.getElementsByClassName(dotclass);
  if (n > slides.length) {window[counter] = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" carousel-active", "");
  }
  slides[window[counter]-1].style.display = "block";
  dots[window[counter]-1].className += " carousel-active";
}

checkElement('.mySlides') //use whichever selector you want
.then((element) => {
	console.log("sldaldsaldsa");
	showSlides(slideIndex);
});

checkElement('.mySlides2') //use whichever selector you want
.then((element) => {
	console.log("sldaldsaldsa");
	showSlides(slideIndex2, "mySlides2", "slideIndex2");
});

checkElement('.mySlides3') //use whichever selector you want
.then((element) => {
	console.log("sldaldsaldsa");
	showSlides(slideIndex3, "mySlides3", "slideIndex3");
});