javascript - 将滚动位置调整到最近的容器

Question

我目前正在寻找一个 JavaScript（例如 Jquery lib）解决方案来将滚动的位置调整为特定的 css 类。目标是将滚动条重新定位在最近的容器上。

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感谢 JUJU

Answer 1

如果您使用 JQuery，如果我正确理解您的问题，则相对容易实现。大致如下我会怎么做：

function scrollTo(a){
    //Get current scroll position
    var current = (document.all ? document.scrollTop : window.pageYOffset);
    //Define variables for data collection
    var target = undefined;
    var targetpos = undefined;
    var dif = 0;
    //check each selected element to see witch is closest
    $(a).each(function(){
        //Save the position of the element to avoid repeated property lookup
        var t = $(this).position().top;
        //check if there is an element to check against
        if (target != undefined){
            //save the difference between the current element's position and the current scroll position to avoid repeated calculations
            var tdif = Math.abs(current - t);
            //check if its closer than the selected element
            if(tdif < dif){
                //set the current element to be selected
                target = this;
                targetpos = t;
                dif = tdif;
            }
        } else {
            //set the current element to be selected
            target = this;
            targetpos = t;
            dif = Math.abs(current - t);
        }
    });
    //check if an element has been selected
    if (target != undefined){
        //animate scroll to the elements position
        $('html,body').animate({scrollTop: targetpos}, 2000);
    }
}

这可能不是最好的方法，但它应该有效。只需调用该函数并将 JQuery 选择作为第一个参数传递。