swipe slider 3.4.2 limited nav items

 //timeline
        var timelineLimit = 7;
        var timelineHalf = 3;

        var timelineTotal = 0;
        var timelineLimitO = 0;
        var timelineHalfO = 0;
		var timelineActive = 0;
		var timelineSwiper = new Swiper ('.timeline .swiper-container', {
			direction: 'vertical',
			loop: false,
			speed: 1600,
			pagination: '.swiper-pagination',
			paginationBulletRender: function (swiper, index, className) {
				var year = document.querySelectorAll('.swiper-slide')[index].getAttribute('data-year');
                timelineTotal++;
				return '<span class="' + className + '">' + year + '</span>';
			},
			paginationClickable: true,
            /*renderFraction: function (currentClass, totalClass) {
                return '<span class="' + currentClass + '"></span>' +
                    ' of ' +
                    '<span class="' + totalClass + '"></span>';
            },
            renderProgressbar: function (progressbarFillClass) {
                return '<span class="' + progressbarFillClass + '"></span>';
            },
            */
            /*renderBullet: function (index, className) {
                return '<span class="' + className + '">' + (index + 1) + '</span>';
            },*/
			nextButton: '.swiper-button-next',
			prevButton: '.swiper-button-prev',
			breakpoints: {
				768: {
					direction: 'horizontal',
				}
			},
            onSlideNextEnd: function (s) {
                //console.log('next');

                timelineHalfO = timelineTotal - timelineHalf;
                timelineLimitO = timelineTotal - timelineLimit;

                timelineActive = $('.swiper-pagination-bullets').find('.swiper-pagination-bullet.swiper-pagination-bullet-active').index();
                timelineActive = timelineActive+1;

                timelinePagi(timelineTotal, timelineLimit, timelineLimitO, timelineActive, timelineHalfO, timelineHalf);

                /*if(timelineTotal > timelineLimit){
                    if(timelineActive <= timelineLimit){
                        $('.swiper-pagination-bullets .swiper-pagination-bullet').each(function (index, element) {
                            var $current = index+1;
                            if($current <= timelineLimit) $(element).show();
                            else $(element).hide();
                        });
                    }
                    else if(timelineActive >= timelineLimitO){
                        $('.swiper-pagination-bullets .swiper-pagination-bullet').each(function (index, element) {
                            var $current = index+1;
                            if($current > timelineLimitO) $(element).show();
                            else $(element).hide();
                        });
                    }
                    else{

                    }
                }//end*/

            },
            onSlidePrevEnd: function (s) {
            	//console.log('prev');

                timelineHalfO = timelineTotal - timelineHalf;
                timelineLimitO = timelineTotal - timelineLimit;


                timelineActive = $('.swiper-pagination-bullets').find('.swiper-pagination-bullet.swiper-pagination-bullet-active').index();
                timelineActive = timelineActive+1;

                timelinePagi(timelineTotal, timelineLimit, timelineLimitO, timelineActive, timelineHalfO, timelineHalf);


            },
            //onPaginationRendered: function (s) {
            onInit: function (s) {
                //console.log('onPaginationRendered');

                timelineHalfO = timelineTotal - timelineHalf;
                timelineLimitO = timelineTotal - timelineLimit;


                timelineActive = $('.swiper-pagination-bullets').find('.swiper-pagination-bullet.swiper-pagination-bullet-active').index();
                timelineActive = timelineActive+1;

                timelinePagi(timelineTotal, timelineLimit, timelineLimitO, timelineActive, timelineHalfO, timelineHalf);


            }

		});

		function  timelinePagi(timelineTotal, timelineLimit, timelineLimitO, timelineActive, timelineHalfO, timelineHalf) {
            if(timelineTotal > timelineLimit){
                if(timelineActive <= timelineLimit){
                    $('.swiper-pagination-bullets .swiper-pagination-bullet').each(function (index, element) {
                        var $current = index+1;
                        if($current <= timelineLimit) $(element).show();
                        else $(element).hide();
                    });
                }
                else if(timelineActive >= timelineLimitO){
                    $('.swiper-pagination-bullets .swiper-pagination-bullet').each(function (index, element) {
                        var $current = index+1;
                        if($current > timelineLimitO) $(element).show();
                        else $(element).hide();
                    });
                }
                else{
                    $('.swiper-pagination-bullets .swiper-pagination-bullet').each(function (index, element) {
                        var $current = index+1;
                        if($current < (timelineActive-timelineHalf)) $(element).hide();
                        else if($current > (timelineActive+timelineHalf)) $(element).hide();
                        else if($current == timelineActive) $(element).show();
                        else $(element).show();
                    });
                }
            }//end
        }