Native js Touch simple Slider class for mobile

nativetouchslide.js

function NativeTouchSlide(selector, minMoveX) {
	this.domSelector = document.querySelector(selector) || selector;
	this.sCh = this.domSelector.children;
	this.checkSelector = !!this.domSelector && this.sCh && this.sCh.length>1;
	this.minMoveX = minMoveX || 30;

	if (this.checkSelector) {
		this.domSelector.addEventListener('touchstart', this.onTouchStart.bind(this));
		this.addClass(this.sCh[0], "current");
	}
	else throw new Error("Place initialization code inside the DOMContentLoaded event or similar\n
					and fill in the container width enough elements!");
}
NativeTouchSlide.prototype = {
	cancelTouch : function() {
	 	this.domSelector.removeEventListener('touchmove', this.onTouchMove);
	 	this.startX = null;
	 	this.isMoving = false;
	},
	onTouchStart : function(e) {
		if (!this.checkSelector || e.touches.length != 1) return;

		this.startX = e.touches[0].pageX; //clientX
		this.isMoving = true;
		this.domSelector.addEventListener('touchmove', this.onTouchMove.bind(this), false);
	},
	onTouchMove : function(e) {
		if (!this.checkSelector || !this.isMoving) return;

		var x = e.touches[0].pageX, //clientX
			dx = this.startX - x;
		if (Math.abs(dx) >= this.minMoveX) {
			this.cancelTouch();
	        if (dx > 0) {
	            //left swipe
	            this.nextSlide("left");
	        }
	        else {
	            //right swipe
	            this.nextSlide("right");
	        }
		}
	},
	addClass : function(el, cl) {
		if (el.className.indexOf(cl) == -1)
			el.className += (el.className ? ' ' : '') + cl;
	},
	removeClass : function(el, cl) {
		if (el.className.indexOf(cl) == -1) return;

		var classList = el.className.split(" "),
			newClass = '';
		for (var i=0; i < classList.length; i++) {
			if classList[i] && classList[i] != cl)
				newClass += classList[i] + " ";
		}
		el.className = newClass;
	},
	nextSlide : function(flag) {
		var current = this.domSelector.querySelector(".current");
		if (!current) return;

		var check1 = (flag == "left"
					? current.nextElementSibling
					: current.previousElementSibling),
			check2 = (flag == "left"
					? !current.nextElementSibling
					: !current.previousElementSibling);
		if (check1) {
			this.addClass((flag == "left"
						? current.nextElementSibling
						: current.previousElementSibling),
				"current");
		}
		else if (check2) {
			this.addClass((flag == "left"
						? this.sCh[0]
						: this.sCh[this.sCh.length-1]),
				"current");
		}
		this.removeClass(current, "current");
	}
}


//implementation
document.addEventListener("DOMContentLoaded", function(){
	
	var mySlider = new NativeTouchSlide("#my-carousel");

}, false);