javascript – jQuery scrollTo – 垂直中心窗口中的Div

我有一个网站使用页面顶部的固定菜单.

单击链接时,它应垂直滚动,以使该目标div的中心与窗口的垂直中心对齐,偏移标题的高度.
   – 这非常重要,无论显示器的分辨率如何,div都会居中

我正在使用jQuery和scrollTo,但无法弄清楚这需要的数学.

这是我的尝试：

function scrollTo(target) {
var offset;
var scrollSpeed = 600;

if (viewport()["width"] > 767 && !jQuery.browser.mobile) {
    // Offset anchor location and offset navigation bar if navigation is fixed
    offset = $(target).offset().top - document.getElementById('navigation').clientHeight;
} else {
    // Offset anchor location only since navigation bar is Now static
    offset = $(target).offset().top;
}

    $('html, body').animate({scrollTop:offset}, scrollSpeed);
}

解决方法:

最终想通了.只是对数学愚蠢.固定页眉和页脚的偏移也适用于所有分辨率.

    // scrollTo: Smooth scrolls to target id
function scrollTo(target) {
    var offset;
    var scrollSpeed = 600;
        var wheight = $(window).height();
        //var targetname = target;
        //var windowheight = $(window).height();
        //var pagecenterH = windowheight/2;
        //var targetheight = document.getElementById(targetname).offsetHeight;

    if (viewport()["width"] > 767 && !jQuery.browser.mobile) {
        // Offset anchor location and offset navigation bar if navigation is fixed
        //offset = $(target).offset().top - document.getElementById('navigation').clientHeight;
                offset = $(target).offset().top - $(window).height() / 2 + document.getElementById('navigation').clientHeight + document.getElementById('footer').clientHeight;
    } else {
        // Offset anchor location only since navigation bar is Now static
        offset = $(target).offset().top;
    }

    $('html, body').animate({scrollTop:offset}, scrollSpeed);
}