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Update scrollfix.js #3

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Update scrollfix.js #3

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22 changes: 21 additions & 1 deletion js/scrollfix.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
placeholder = jQuery('<div>'), //创建一个jquery对象
optsTop = opts.distanceTop, //定义到顶部的高度
endfix = 0; //开始停止固定的位置


var originalPosition;
var originalOffsetTop;
Expand Down Expand Up @@ -132,6 +133,25 @@
function onScroll() {
lastOffsetLeft = 1;
var ScrollTop = $(window).scrollTop();

/**Jackie重新计算相关数据start****/
var documentHeight = $(document).height(); //文档高度
var startTop = $(opts.startTop), //开始浮动固定对象
startBottom = $(opts.startBottom),
toBottom, //停止滚动位置距离底部的高度
ScrollHeight; //对象滚动的高度
//计算停在底部的距离
if (!isNaN(opts.endPos))
{
toBottom = opts.endPos;
} else
{
toBottom = parseFloat(documentHeight - $(opts.endPos).offset().top);
}
//计算需要滚动的高度以及停止滚动的高度
ScrollHeight = parseFloat(documentHeight - toBottom - optsTop), endfix = parseFloat(ScrollHeight - outerHeight);
/**Jackie重新计算相关数据end**/

if (opts.bottom != -1) {
ScrollTop = ScrollTop + $(window).height() - outerHeight - opts.bottom;
}
Expand Down Expand Up @@ -217,4 +237,4 @@
zIndex: 0, //z-index值
baseClassName: 'scrollfixed' //开始固定时添加的类
};
})(jQuery);
})(jQuery);