我有一个div,只有300像素大,我希望它在页面加载时滚动到内容的底部。这个div有动态添加的内容,需要一直向下滚动。现在如果用户决定向上滚动,我不希望它跳回底部,直到用户再次向下滚动

是否有可能有一个div,将保持滚动到底部,除非用户向上滚动,当用户滚动回底部时,它需要保持自己在底部,即使添加了新的动态内容。我该怎么做呢。


当前回答

这可能对你有帮助:

var element = document.getElementById("yourDivID");
element.scrollTop = element.scrollHeight;

[编辑],为了匹配注释…

function updateScroll(){
    var element = document.getElementById("yourDivID");
    element.scrollTop = element.scrollHeight;
}

每当添加内容时,调用函数updateScroll(),或设置一个计时器:

//once a second
setInterval(updateScroll,1000);

如果你只想在用户没有移动的情况下更新:

var scrolled = false;
function updateScroll(){
    if(!scrolled){
        var element = document.getElementById("yourDivID");
        element.scrollTop = element.scrollHeight;
    }
}

$("#yourDivID").on('scroll', function(){
    scrolled=true;
});

其他回答

$('#div1').scrollTop($('#div1')[0].scrollHeight);

Or animated:

$("#div1").animate({ scrollTop: $('#div1')[0].scrollHeight}, 1000);

我发现最友好的解决方案是将滚动-快照-对齐方法与少量Javascript结合起来。前一种解决方案本身的问题是,抓拍太强了,你必须滚动很远才能摆脱它。

相反,我们可以在容器滚动到底部时使用捕捉动态,然后在用户向上滚动超过某个阈值时禁用它。

这个解决方案还有一个额外的好处,那就是它是一个渐进的增强:如果用户禁用了Javascript,它就会退回到只使用css的方法。

const container = document.getElementById("container"); const snap = document.getElementById("snap"); // Scroll the view to the bottom once initially container.scrollTop = container.scrollHeight; container.addEventListener("scroll", (event) => { const target = event.currentTarget; const scroll = target.scrollTop; const maxScroll = target.scrollHeight - target.clientHeight; const threshold = 50; // px isScrollBottomedOut = maxScroll - scroll < threshold; // If the user scrolls up more than the threshold, disable snapping // If the user scrolls down again, reenable snapping snap.style.display = isScrollBottomedOut ? "block" : "none"; }); #container { width: 200px; height: 500px; overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch; -ms-scroll-chaining: none; overscroll-behavior: contain; -ms-scroll-snap-type: y proximity; scroll-snap-type: y proximity; border: 2px solid black; } #snap { scroll-snap-align: end; } <div id="container"> <ol> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> <li>item</li> </ol> <!-- This is the snapping target, if visible --> <div id="snap"></div> </div>

我试着用Bootstrap 5来做同样的事情。我正在编写的页面是一个单窗口html工具,我想要两列具有可滚动内容,其中一列需要反向,因为它是一个日志(另一列不太可能滚动,除非故意这么做)。列表和它们的标题也是底部锚定的,我很难让标题保持在一个灵活的可滚动列表的顶部。

多亏了上面的例子,我才能够找出我所缺少的内容并获得正确的类类型。

下面是完整的例子。在我实际的应用程序中,有其他两个类mh-100 col overflow-auto的第三列,不需要内部行/列,因为没有标题贴在顶部(如果视口太小,它只会正常滚动)。列表有一个ID,我使用它来选择并添加到它们前面或删除顶部元素(这是反向列表中的bottom <li>项)。

这里提供了一个较小的版本:

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous"> <div class="vh-100 w-75 container-fluid"> <h1>2nd Level Scrolling Example</h1> <div class="h-75 row align-items-end"> <div class="mh-100 col d-flex flex-column"> <div class="row align-items-end"> <div class="col"><h3>Normal scroll list, grow on top</h3></div> </div> <div class="row align-items-end overflow-auto"> <div class="mh-100 col"> <ul class="list-group"> <li>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ut</li> <li>tortor eu ex tincidunt pretium non eu nisl. Ut eu libero ac velit</li> <li>ultricies dapibus. Donec id augue scelerisque, gravida est ut,</li> <li>commodo sapien. Interdum et malesuada fames ac ante ipsum primis</li> <li>in faucibus. Suspendisse volutpat fermentum finibus. Cras egestas</li> <li>tempor tempor. Suspendisse potenti. Mauris ac tellus ultrices lectus</li> <li>accumsan pellentesque. Nullam semper, nisi nec euismod ultrices, leo</li> <li>sem bibendum sapien, in rutrum sapien massa id mi.</li> </ul> </div> </div> </div> <div class="mh-100 col d-flex flex-column"> <div class="row align-items-end"> <div class="col"><h3>Reverse scroll list, grow on bottom</h3></div> </div> <div class="row align-items-end d-flex flex-column-reverse overflow-auto"> <div class="mh-100 col"> <ul class="list-group"> <li>sem bibendum sapien, in rutrum sapien massa id mi.</li> <li>accumsan pellentesque. Nullam semper, nisi nec euismod ultrices, leo</li> <li>tempor tempor. Suspendisse potenti. Mauris ac tellus ultrices lectus</li> <li>in faucibus. Suspendisse volutpat fermentum finibus. Cras egestas</li> <li>commodo sapien. Interdum et malesuada fames ac ante ipsum primis</li> <li>ultricies dapibus. Donec id augue scelerisque, gravida est ut,</li> <li>tortor eu ex tincidunt pretium non eu nisl. Ut eu libero ac velit</li> <li>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ut</li> </ul> </div> </div> </div> </div> </div>

如果你的视口高度小于整体内容,标题应该位于列表的顶部,而所有内容都位于页面的底部(实际上是视口高度的75%,但在这个例子中,标题并没有占据它设计的空间)。

注:我不是一个真正的web开发人员,只是编写一些方便的基于html的工具来处理日常工作,所以非常欢迎评论。

Jim Hall的答案更可取,因为当你向上滚动时,它确实不会滚动到底部,它也是纯CSS。

然而,非常不幸的是,这不是一个稳定的解决方案:在chrome(可能是由于1像素的问题由dotnetCarpenter上面描述),scrollTop行为不准确的1像素,即使没有用户交互(在元素添加)。你可以设置scrollTop = scrollHeight - clientHeight,但是当另一个元素被添加时,这将保持div的位置,也就是“保持自己在底部”功能不再工作了。

所以,简而言之,添加少量Javascript(唉)将修复这个问题并满足所有要求:

类似于https://codepen.io/anon/pen/pdrLEZ this(示例由Coo),在添加一个元素到列表后,还可以执行以下操作:

container = ...
if(container.scrollHeight - container.clientHeight - container.scrollTop <= 29) {
    container.scrollTop = container.scrollHeight - container.clientHeight;
}

29是直线的高度。

因此,当用户向上滚动半行时(如果可能的话?),Javascript将忽略它并滚动到底部。但我想这是可以忽略的。而且,它修复了Chrome 1px的东西。

以下是你所需要的(我尽了最大的努力,一路上进行了大量的谷歌搜索):

<html>
<head>
  <script>
    // no jquery, or other craziness. just
    // straight up vanilla javascript functions
    // to scroll a div's content to the bottom
    // if the user has not scrolled up.  Includes
    // a clickable "alert" for when "content" is
    // changed.

    // this should work for any kind of content
    // be it images, or links, or plain text
    // simply "append" the new element to the
    // div, and this will handle the rest as
    // proscribed.

    let scrolled = false; // at bottom?
    let scrolling = false; // scrolling in next msg?
    let listener = false; // does element have content changed listener?
    let contentChanged = false; // kind of obvious
    let alerted = false; // less obvious

    function innerHTMLChanged() {
      // this is here in case we want to
      // customize what goes on in here.
      // for now, just:
      contentChanged = true;
    }

    function scrollToBottom(id) {
      if (!id) { id = "scrollable_element"; }
      let DEBUG = 0; // change to 1 and open console
      let dstr = "";

      let e = document.getElementById(id);
      if (e) {
        if (!listener) {
          dstr += "content changed listener not active\n";
          e.addEventListener("DOMSubtreeModified", innerHTMLChanged);
          listener = true;
        } else {
          dstr += "content changed listener active\n";
        }
        let height = (e.scrollHeight - e.offsetHeight); // this isn't perfect
        let offset = (e.offsetHeight - e.clientHeight); // and does this fix it? seems to...
        let scrollMax = height + offset;

        dstr += "offsetHeight: " + e.offsetHeight + "\n";
        dstr += "clientHeight: " + e.clientHeight + "\n";
        dstr += "scrollHeight: " + e.scrollHeight + "\n";
        dstr += "scrollTop: " + e.scrollTop + "\n";
        dstr += "scrollMax: " + scrollMax + "\n";
        dstr += "offset: " + offset + "\n";
        dstr += "height: " + height + "\n";
        dstr += "contentChanged: " + contentChanged + "\n";

        if (!scrolled && !scrolling) {
          dstr += "user has not scrolled\n";
          if (e.scrollTop != scrollMax) {
            dstr += "scroll not at bottom\n";
            e.scroll({
              top: scrollMax,
              left: 0,
              behavior: "auto"
            })
            e.scrollTop = scrollMax;
            scrolling = true;
          } else {
            if (alerted) {
              dstr += "alert exists\n";
            } else {
              dstr += "alert does not exist\n";
            }
            if (contentChanged) { contentChanged = false; }
          }
        } else {
          dstr += "user scrolled away from bottom\n";
          if (!scrolling) {
            dstr += "not auto-scrolling\n";

            if (e.scrollTop >= scrollMax) {
              dstr += "scroll at bottom\n";
              scrolled = false;

              if (alerted) {
                dstr += "alert exists\n";
                let n = document.getElementById("alert");
                n.remove();
                alerted = false;
                contentChanged = false;
                scrolled = false;
              }
            } else {
              dstr += "scroll not at bottom\n";
              if (contentChanged) {
                dstr += "content changed\n";
                if (!alerted) {
                  dstr += "alert not displaying\n";
                  let n = document.createElement("div");
                  e.append(n);
                  n.id = "alert";
                  n.style.position = "absolute";
                  n.classList.add("normal-panel");
                  n.classList.add("clickable");
                  n.classList.add("blink");
                  n.innerHTML = "new content!";

                  let nposy = parseFloat(getComputedStyle(e).height) + 18;
                  let nposx = 18 + (parseFloat(getComputedStyle(e).width) / 2) - (parseFloat(getComputedStyle(n).width) / 2);
                  dstr += "nposx: " + nposx + "\n";
                  dstr += "nposy: " + nposy + "\n";
                  n.style.left = nposx;
                  n.style.top = nposy;

                  n.addEventListener("click", () => {
                    dstr += "clearing alert\n";
                    scrolled = false;
                    alerted = false;
                    contentChanged = false;
                    n.remove();
                  });

                  alerted = true;
                } else {
                  dstr += "alert already displayed\n";
                }
              } else {
                alerted = false;
              }
            }
          } else {
            dstr += "auto-scrolling\n";
            if (e.scrollTop >= scrollMax) {
              dstr += "done scrolling";
              scrolling = false;
              scrolled = false;
            } else {
              dstr += "still scrolling...\n";
            }
          }
        }
      }

      if (DEBUG && dstr) console.log("stb:\n" + dstr);

      setTimeout(() => { scrollToBottom(id); }, 50);
    }

    function scrollMessages(id) {
      if (!id) { id = "scrollable_element"; }
      let DEBUG = 1;
      let dstr = "";

      if (scrolled) {
        dstr += "already scrolled";
      } else {
        dstr += "got scrolled";
        scrolled = true;
      }
      dstr += "\n";

      if (contentChanged && alerted) {
        dstr += "content changed, and alerted\n";
        let n = document.getElementById("alert");
        if (n) {
          dstr += "alert div exists\n";
          let e = document.getElementById(id);
          let nposy = parseFloat(getComputedStyle(e).height) + 18;
          dstr += "nposy: " + nposy + "\n";
          n.style.top = nposy;
        } else {
          dstr += "alert div does not exist!\n";
        }
      } else {
        dstr += "content NOT changed, and not alerted";
      }

      if (DEBUG && dstr) console.log("sm: " + dstr);
    }

    setTimeout(() => { scrollToBottom("messages"); }, 1000);

    /////////////////////
    // HELPER FUNCTION
    //   simulates adding dynamic content to "chat" div
    let count = 0;
    function addContent() {
      let e = document.getElementById("messages");
      if (e) {
        let br = document.createElement("br");
        e.append("test " + count);
        e.append(br);
        count++;
      }
    }
  </script>

  <style>
    button {
      border-radius: 5px;
    }

    #container {
      padding: 5px;
    }

    #messages {
      background-color: blue;
      border: 1px inset black;
      border-radius: 3px;
      color: white;
      padding: 5px;
      overflow-x: none;
      overflow-y: auto;
      max-height: 100px;
      width: 100px;
      margin-bottom: 5px;
      text-align: left;
    }

    .bordered {
      border: 1px solid black;
      border-radius: 5px;
    }

    .inline-block {
      display: inline-block;
    }

    .centered {
      text-align: center;
    }

    .normal-panel {
      background-color: #888888;
      border: 1px solid black;
      border-radius: 5px;
      padding: 2px;
    }

    .clickable {
      cursor: pointer;
    }
  </style>
</head>
<body>
<div id="container" class="bordered inline-block centered">
  <div class="inline-block">My Chat</div>

  <div id="messages" onscroll="scrollMessages('messages')">
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
    test<br>
  </div>

  <button onclick="addContent();">Add Content</button>
</div>
</body>
</html>

注意:你可能需要在scrollToBottom和scrollMessages中调整警报位置(nposx和nposy)来匹配你的需求…

还有一个链接到我自己的工作示例,托管在我的服务器上:https://night-stand.ca/jaretts_tests/chat_scroll.html