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(function($) {
$.fn.timeline = function() {
var selectors = {
id: $(this),
item: $(this).find(".timeline-item"),
activeClass: "timeline-item--active",
img: ".timeline__img"
};
selectors.item.eq(0).addClass(selectors.activeClass);
selectors.id.css(
"background-image",
"url(" +
selectors.item
.first()
.find(selectors.img)
.attr("src") +
")"
);
var itemLength = selectors.item.length;
$(window).scroll(function() {
var max, min;
var pos = $(this).scrollTop();
selectors.item.each(function(i) {
min = $(this).offset().top;
max = $(this).height() + $(this).offset().top;
var that = $(this);
if (i == itemLength - 2 && pos > min + $(this).height() / 2) {
selectors.item.removeClass(selectors.activeClass);
selectors.id.css(
"background-image",
"url(" +
selectors.item
.last()
.find(selectors.img)
.attr("src") +
")"
);
selectors.item.last().addClass(selectors.activeClass);
} else if (pos <= max - 40 && pos >= min) {
selectors.id.css(
"background-image",
"url(" +
$(this)
.find(selectors.img)
.attr("src") +
")"
);
selectors.item.removeClass(selectors.activeClass);
$(this).addClass(selectors.activeClass);
}
});
});
};
})(jQuery);
$("#timeline-1").timeline();
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