spolky/static/js/carousel.js

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;


// Next/previous controls
function plusSlides(n, className = "mySlides") {
  console.log("changing slides");
  showSlides(slideIndex += n, className);
}

// Thumbnail image controls
function currentSlide(n, className = "mySlides") {
  showSlides(slideIndex = n, className);
}

function showSlides(n, className = "mySlides") {
  var i;
  var slides = document.getElementsByClassName(className);
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 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[slideIndex-1].style.display = "block";
  dots[slideIndex-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(slideIndex, "mySlides2");
});

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

checkElement('.mySlides4') //use whichever selector you want
.then((element) => {
	console.log("sldaldsaldsa");
	showSlides(slideIndex, "mySlides4");
});

checkElement('.mySlides5') //use whichever selector you want
.then((element) => {
	console.log("sldaldsaldsa");
	showSlides(slideIndex, "mySlides5");
});