javascript - 向上和向下调整滚动位置到最近的包装器 div

Question

我已经阅读了很多线程，但仍然无法找到不使用快速滚动插件的解决方案( https://github.com/wtm/jquery.snapscroll )。

我试图遵循这个

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);
}

}

我正在尝试让它滚动到 View 中

<div class="projectWrap"> 

fiddle :http://jsfiddle.net/Dar_T/2h2wjp2L/1/

很像这个网站 http://www.takumitaniguchi.com/tokyoblue/让它滚动查看其容器。

Answer 1

首先您必须找到元素的offset()。然后将其与 $(window.scrollTop()) 进行比较，然后您可以进行任何您想要的更改。以下是一些代码:

var project1 = $(".projectWrap").offset();
if($(window).scrollTop() >= project1.top){ // compare window scrolltop to element offset()
    $("#tlos1").css("color","blue"); // change navigation
    $("#tlos2").css("color","black");
    $("#tlos3").css("color","black");
}

这是DEMO