单击时平滑滚动到特定的 div

Question

我想要做的是，如果你点击一个按钮，它会向下（平滑）滚动到页面上的特定 div。

我需要的是，如果您单击按钮，它会平滑滚动到 div 'second'。

.first {
    width: 100%;
    height: 1000px;
    background: #ccc;
}

.second {
    width: 100%;
    height: 1000px;
    background: #999;
}

<div class="first"><button type="button">Click Me!</button></div>
<div class="second">Hi</div>

Answer 1

做：

$("button").click(function() {
    $('html,body').animate({
        scrollTop: $(".second").offset().top},
        'slow');
});

更新Jsfiddle

Answer 2

有很多使用 jQuery、Mootools、Prototype 等 JS 库实现平滑滚动的示例。

以下示例基于纯 JavaScript。如果您在页面上没有 jQuery/Mootools/Prototype，或者您不想使用繁重的 JS 库来重载页面，那么该示例将会有所帮助。

http://jsfiddle.net/rjSfP/

HTML 部分：

<div class="first"><button type="button" onclick="smoothScroll(document.getElementById('second'))">Click Me!</button></div>
<div class="second" id="second">Hi</div>

CSS 部分：

.first {
    width: 100%;
    height: 1000px;
    background: #ccc;
}

.second {
    width: 100%;
    height: 1000px;
    background: #999;
}

JS部分：

window.smoothScroll = function(target) {
    var scrollContainer = target;
    do { //find scroll container
        scrollContainer = scrollContainer.parentNode;
        if (!scrollContainer) return;
        scrollContainer.scrollTop += 1;
    } while (scrollContainer.scrollTop == 0);

    var targetY = 0;
    do { //find the top of target relatively to the container
        if (target == scrollContainer) break;
        targetY += target.offsetTop;
    } while (target = target.offsetParent);

    scroll = function(c, a, b, i) {
        i++; if (i > 30) return;
        c.scrollTop = a + (b - a) / 30 * i;
        setTimeout(function(){ scroll(c, a, b, i); }, 20);
    }
    // start scrolling
    scroll(scrollContainer, scrollContainer.scrollTop, targetY, 0);
}

Answer 3

如果你使用 scrollIntoView 功能呢？

var elmntToView = document.getElementById("sectionId");
elmntToView.scrollIntoView(); 

{behavior: "smooth"} 也有.... ;) https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView

Answer 4

我玩弄了一下 nico 的回答，感觉很紧张。做了一些调查，发现window.requestAnimationFrame 这是一个在每个重绘周期中调用的函数。这允许看起来更干净的动画。仍在尝试调整步长的良好默认值，但对于我的示例，使用此实现看起来相当不错。

var smoothScroll = function(elementId) {
    var MIN_PIXELS_PER_STEP = 16;
    var MAX_SCROLL_STEPS = 30;
    var target = document.getElementById(elementId);
    var scrollContainer = target;
    do {
        scrollContainer = scrollContainer.parentNode;
        if (!scrollContainer) return;
        scrollContainer.scrollTop += 1;
    } while (scrollContainer.scrollTop == 0);

    var targetY = 0;
    do {
        if (target == scrollContainer) break;
        targetY += target.offsetTop;
    } while (target = target.offsetParent);

    var pixelsPerStep = Math.max(MIN_PIXELS_PER_STEP,
                                 (targetY - scrollContainer.scrollTop) / MAX_SCROLL_STEPS);

    var stepFunc = function() {
        scrollContainer.scrollTop =
            Math.min(targetY, pixelsPerStep + scrollContainer.scrollTop);

        if (scrollContainer.scrollTop >= targetY) {
            return;
        }

        window.requestAnimationFrame(stepFunc);
    };

    window.requestAnimationFrame(stepFunc);
}

Answer 5

对我有用的解决方案：

var element = document.getElementById("box");

element.scrollIntoView({behavior: "smooth"});

您可以探索更多选项here

Answer 6

你可以使用基本的css来实现平滑滚动

html {
  scroll-behavior: smooth;
}

Answer 7

我采用了Ned Rockson 的版本并对其进行了调整以允许向上滚动。

var smoothScroll = function(elementId) {
  var MIN_PIXELS_PER_STEP = 16;
  var MAX_SCROLL_STEPS = 30;
  var target = document.getElementById(elementId);
  var scrollContainer = target;
  do {
    scrollContainer = scrollContainer.parentNode;
    if (!scrollContainer) return;
    scrollContainer.scrollTop += 1;
  } while (scrollContainer.scrollTop === 0);

  var targetY = 0;
  do {
    if (target === scrollContainer) break;
    targetY += target.offsetTop;
  } while (target = target.offsetParent);

  var pixelsPerStep = Math.max(MIN_PIXELS_PER_STEP,
    Math.abs(targetY - scrollContainer.scrollTop) / MAX_SCROLL_STEPS);

  var isUp = targetY < scrollContainer.scrollTop;

  var stepFunc = function() {
    if (isUp) {
      scrollContainer.scrollTop = Math.max(targetY, scrollContainer.scrollTop - pixelsPerStep);
      if (scrollContainer.scrollTop <= targetY) {
        return;
      }
    } else {
        scrollContainer.scrollTop = Math.min(targetY, scrollContainer.scrollTop + pixelsPerStep);

      if (scrollContainer.scrollTop >= targetY) {
        return;
      }
    }

    window.requestAnimationFrame(stepFunc);
  };

  window.requestAnimationFrame(stepFunc);
};

Answer 8

Ned Rockson 基本上回答了这个问题。然而，他的解决方案存在一个致命的缺陷。当目标元素比视口高度更靠近页面底部时，该函数不会到达其退出语句并将用户困在页面底部。这可以通过限制迭代次数来解决。

var smoothScroll = function(elementId) {
    var MIN_PIXELS_PER_STEP = 16;
    var MAX_SCROLL_STEPS = 30;
    var target = document.getElementById(elementId);
    var scrollContainer = target;
    do {
        scrollContainer = scrollContainer.parentNode;
        if (!scrollContainer) return;
        scrollContainer.scrollTop += 1;
    } while (scrollContainer.scrollTop == 0);

    var targetY = 0;
    do {
        if (target == scrollContainer) break;
        targetY += target.offsetTop;
    } while (target = target.offsetParent);

    var pixelsPerStep = Math.max(MIN_PIXELS_PER_STEP,
                                 (targetY - scrollContainer.scrollTop) / MAX_SCROLL_STEPS);

    var iterations = 0;
    var stepFunc = function() {
        if(iterations > MAX_SCROLL_STEPS){
            return;
        }
        scrollContainer.scrollTop =
            Math.min(targetY, pixelsPerStep + scrollContainer.scrollTop);

        if (scrollContainer.scrollTop >= targetY) {
            return;
        }

        window.requestAnimationFrame(stepFunc);
    };

    window.requestAnimationFrame(stepFunc);
}