使用纯 Javascript 滚动到可滚动 DIV 内的元素

Question

我有一个包含overflow: scroll 的 div，并且我在 DIV 中有一些隐藏的元素。单击页面上的按钮时，我想让 DIV 滚动到 DIV 内的特定元素。

我如何做到这一点？

Answer 1

您需要读取需要滚动到的 div 的 offsetTop 属性，然后将该偏移量设置为容器 div 的 scrollTop 属性。将此函数绑定到你想要的事件：

function scrollToElementD(){
    var topPos = document.getElementById('inner-element').offsetTop;
    document.getElementById('container').scrollTop = topPos-10;
}

div {
    height: 200px;
    width: 100px;
    border: 1px solid black;
    overflow: auto;
}

p {
    height: 80px;
    background: blue;
}
#inner-element {
    background: red;
}

<div id="container"><p>A</p><p>B</p><p>C</p><p id="inner-element">D</p><p>E</p><p>F</p></div>
<button onclick="scrollToElementD()">SCROLL TO D</button>

function scrollToElementD(){
  var topPos = document.getElementById('inner-element').offsetTop;
  document.getElementById('container').scrollTop = topPos-10;
}

小提琴：http://jsfiddle.net/p3kar5bb/322/（@rofrischmann 提供）

Answer 2

只是通过在 div 中包含的列表中设置平滑的自动滚动来改进它

https://codepen.io/rebosante/pen/eENYBv

var topPos = elem.offsetTop

document.getElementById('mybutton').onclick = function () {
   console.log('click')
  scrollTo(document.getElementById('container'), topPos-10, 600);   
}

function scrollTo(element, to, duration) {
    var start = element.scrollTop,
        change = to - start,
        currentTime = 0,
        increment = 20;

    var animateScroll = function(){        
        currentTime += increment;
        var val = Math.easeInOutQuad(currentTime, start, change, duration);
        element.scrollTop = val;
        if(currentTime < duration) {
            setTimeout(animateScroll, increment);
        }
    };
    animateScroll();
}

//t = current time
//b = start value
//c = change in value
//d = duration
Math.easeInOutQuad = function (t, b, c, d) {
    t /= d/2;
    if (t < 1) return c/2*t*t + b;
    t--;
    return -c/2 * (t*(t-2) - 1) + b;
};

我想这可能对某人有帮助:)

Answer 3

这是一个简单的纯 JavaScript 解决方案，适用于目标数字（scrollTop 的值）、目标 DOM 元素或一些特殊的字符串情况：

/**
 * target - target to scroll to (DOM element, scrollTop Number, 'top', or 'bottom'
 * containerEl - DOM element for the container with scrollbars
 */
var scrollToTarget = function(target, containerEl) {
    // Moved up here for readability:
    var isElement = target && target.nodeType === 1,
        isNumber = Object.prototype.toString.call(target) === '[object Number]';

    if (isElement) {
        containerEl.scrollTop = target.offsetTop;
    } else if (isNumber) {
        containerEl.scrollTop = target;
    } else if (target === 'bottom') {
        containerEl.scrollTop = containerEl.scrollHeight - containerEl.offsetHeight;
    } else if (target === 'top') {
        containerEl.scrollTop = 0;
    }
};

以下是一些用法示例：

// Scroll to the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget('top', scrollableDiv);

或

// Scroll to 200px from the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget(200, scrollableDiv);

或

// Scroll to targetElement
var scrollableDiv = document.getElementById('scrollable_div');
var targetElement= document.getElementById('target_element');
scrollToTarget(targetElement, scrollableDiv);