JAVASCRIPT

slick slider multiple sliders on one page

$('.slider-for').each(function(key, item) {

  var sliderIdName = 'slider' + key;
  var sliderNavIdName = 'sliderNav' + key;

  this.id = sliderIdName;
  $('.slider-nav')[key].id = sliderNavIdName;

  var sliderId = '#' + sliderIdName;
  var sliderNavId = '#' + sliderNavIdName;

  $(sliderId).slick({
    slidesToShow: 1,
    slidesToScroll: 1,
    arrows: false,
    fade: true,
    asNavFor: sliderNavId
  });

  $(sliderNavId).slick({
    slidesToShow: 4,
    slidesToScroll: 1,
    asNavFor: sliderId,
    dots: true,
    arrows: true,
    centerMode: false,
    focusOnSelect: true
  });

});

Multiple Slick Sliders On Same Page with same classes

$(document).ready(function() {
    var myCarousel = $(".slider-for:not(.slick-initialized)");
    myCarousel.each(function() {
        $(this).slick({});
    });
});

Multiple Slick Sliders On Same Page with same classes

$(function () {
    $('.slider-for').each(function(num, elem) {
        elem = $(elem);
        elem.slick({
            slidesToShow: 1,
            slidesToScroll: 1,
            arrows: false,
            draggable: false,
            fade: true,
            asNavFor: '.slider-nav'
        });

        elem.next('.slider-nav-thumbnails').slick({
            slidesToShow: 3,
            slidesToScroll: 1,
            asNavFor: '.slider-for',
            dots: false,
            arrows: false,
            vertical: true,
            draggable: false,
            centerMode: false,
            focusOnSelect: true,
            responsive: [
                {
                    breakpoint: 769,
                    settings: {
                        vertical: false
                    }
                }
            ]
        });
    });
});