class freezingTable {
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constructor(containId, freeClass, headSelect, freeType) {//constructor是一个构造方法，用来接收参数
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this.tdLefts = [];
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this.tdWidths = [];
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this.freeLeft = document.getElementById(containId).offsetLeft;
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this.$free = $("#" + containId);
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this.$frist = this.$free.find("." + freeClass);
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headSelect = headSelect || "table thead td";
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this.$head = $(headSelect);
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//this.freeType = freeType || 1;
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this.freeClass = freeClass;
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}
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freezing() {
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var _this = this;
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var _$free = _this.$free;
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_this.freezingHead();//固定头部
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var scroLeft = _$free.scrollLeft(); //向左滚动的距离
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_this.$frist.each(function (index, first) {
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if (!_this.tdLefts[index]) {
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if (index > 0) {
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_this.tdLefts[index] = first.offsetLeft - _this.tdWidths[index - 1];
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_this.tdWidths[index] = _this.tdWidths[index - 1] + first.offsetWidth;
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}
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else {
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_this.tdLefts[index] = first.offsetLeft;
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_this.tdWidths[index] = first.offsetWidth;
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}
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}
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_this.moveAllFreezing(first, _this.tdLefts[index], scroLeft);
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});
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}
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//table表头固定
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freezingHead() {
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var _this = this;
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var $free = _this.$free;
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var $head = _this.$head;
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var scroTop = $free.scrollTop(); //向下滚动的距离
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var starTop = 0; //开始滚动距离
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var scroDis = scroTop;//滚动距离
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if (scroDis > starTop)
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$head.css("top", scroDis);
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else
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$head.css("top", 0);
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var thHeight = $head.height();
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var step = thHeight / 5;//分5次过渡，每step像素过渡一次
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var tol = Math.ceil(scroDis / step);
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if (scroTop == 0) {
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$head.removeClass("isScrolling").css("opacity", 1);
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} else if (scroDis > 0 && scroDis < thHeight) {
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$head.addClass("isScrolling").css("opacity", 0.2 * tol);
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if ($head.hasClass("")) {
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}
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} else {
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$head.addClass("isScrolling").css("opacity", 1);
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}
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}
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//只需在标题添加first就可以固定一列
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moveAllFreezing(first, firstLeft, scroLeft) {
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var _this = this;
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var $free = _this.$free;
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var freeLeft = _this.freeLeft;
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var $first = $(first);
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var index = $first.index() + 1;
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var $columns = $free.find(`thead th.${_this.freeClass}:nth-child(${index}),tbody .payment:nth-child(${index})`);
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var starLeft = firstLeft - freeLeft + 5; //开始滚动距离
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var scroDis = scroLeft - starLeft;//滚动距离
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if (scroDis > 0) {
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$columns.css("left", scroDis);
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}
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else {
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$columns.css("left", 0);
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}
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var thWidth = $first.width();
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var step = thWidth / 5;//分5次过渡，每step像素过渡一次
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var tol = Math.ceil(scroDis / step);
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if (scroDis <= 0) {
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$columns.removeClass("isScrolling").css("opacity", 1);
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} else if (scroDis > 0 && scroDis < thWidth) {
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$columns.addClass("isScrolling").css("opacity", 0.2 * tol);
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} else {
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$columns.addClass("isScrolling").css("opacity", 1);
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}
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}
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}
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