如何使 div 跟随 jQuery 平滑滚动？

How to make div follow scrolling smoothly with jQuery?

提问by Martti Laine

In my container there are sections/boxes, but the last one of these boxes should follow scrolling when none of the other boxes are visible.

在我的容器中有部分/框，但是当其他框都不可见时，这些框中的最后一个应该跟随滚动。

So, when user scrolls down, he sees a normal sidebar, but when user has went down enough, sidebar ends but the last box starts to follow on the top of the screen. I have seen this a lot on different kind of sites.

因此，当用户向下滚动时，他会看到一个正常的侧边栏，但是当用户向下滚动到足够的位置时，侧边栏结束，但最后一个框开始跟随在屏幕顶部。我在不同类型的网站上见过很多这种情况。

My code at the moment:

我目前的代码：

$(window).scroll(function(){
    $.each($('.follow-scroll'),function(){
        var eloffset = $(this).offset();
        var windowpos = $(window).scrollTop();
        if(windowpos<eloffset.top) {
            var finaldestination = 0;
        } else {
            var finaldestination = windowpos;
        }
        $(this).stop().animate({'top':finaldestination},200);
    });
});

回答by Martti Laine

Since this question is getting a lot of views and the tutorial linked in the most voted answer appears to be offline, I took the time to clean up this script.

由于这个问题获得了很多观点，并且投票最多的答案中链接的教程似乎已脱机，因此我花时间清理了此脚本。

See it live here: JSFiddle

在这里看到它： JSFiddle

JavaScript:

JavaScript：

(function($) {
    var element = $('.follow-scroll'),
        originalY = element.offset().top;

    // Space between element and top of screen (when scrolling)
    var topMargin = 20;

    // Should probably be set in CSS; but here just for emphasis
    element.css('position', 'relative');

    $(window).on('scroll', function(event) {
        var scrollTop = $(window).scrollTop();

        element.stop(false, false).animate({
            top: scrollTop < originalY
                    ? 0
                    : scrollTop - originalY + topMargin
        }, 300);
    });
})(jQuery);

回答by S Pangborn

There's a fantastic jQuery tutorial for this at https://web.archive.org/web/20121012171851/http://jqueryfordesigners.com/fixed-floating-elements/.

在https://web.archive.org/web/20121012171851/http://jqueryfordesigners.com/fixed-floating-elements/ 上有一个很棒的 jQuery 教程。

It replicates the Apple.com shopping cart type of sidebar scrolling. The Google query that might have served you well is "fixed floating sidebar".

它复制了 Apple.com 购物车类型的侧边栏滚动。可能对您有帮助的 Google 查询是“固定浮动侧边栏”。

回答by lukkea

The solution can be boiled down to this:

解决方案可以归结为：

var el=$('#follow-scroll');
var elpos=el.offset().top;
$(window).scroll(function () {
    var y=$(this).scrollTop();
    if(y<elpos){el.stop().animate({'top':0},500);}
    else{el.stop().animate({'top':y-elpos},500);}
});

I have changed the assignment of elbecause finding a single element by class is not a great habit to get in to; if you only want one element find it by id, if you want to iterate over a collection of elements then find them by class.

我改变了分配，el因为按类查找单个元素不是一个好习惯；如果您只想通过 id 找到一个元素，如果您想遍历一组元素，则按类查找它们。

please note - my answer here refers to the accepted answer at that time (it still is the accepted answer at the moment, but has since been edited and therefore my answer no longer "boils down" what you see in @Martti Lane's answer on this page; my answer "boils down" his original, accepted, answer; you can take a look at the edit history of @Martti's answer if you're interested in what I "boiled down".)

请注意 - 我在这里的回答是指当时接受的答案（目前它仍然是接受的答案，但此后已被编辑，因此我的答案不再“归结”您在@Martti Lane 对此的回答中看到的内容页；我的回答“归结为”他原来的、被接受的答案；如果您对我“归结”的内容感兴趣，可以查看@Martti 答案的编辑历史记录。）

回答by ajax333221

This worked for me like a charm.

这对我来说就像一种魅力。

JavaScript:

JavaScript：

$(function() { //doc ready
    if (!($.browser == "msie" && $.browser.version < 7)) {
        var target = "#floating", top = $(target).offset().top - parseFloat($(target).css("margin-top").replace(/auto/, 0));
        $(window).scroll(function(event) {
            if (top <= $(this).scrollTop()) {
                $(target).addClass("fixed");
            } else {
                $(target).removeClass("fixed");
            }
        });
    }
});

CSS:

CSS：

#floating.fixed{
    position:fixed;
    top:0;
}

Source:http://jqueryfordesigners.com/fixed-floating-elements/

来源：http : //jqueryfordesigners.com/fixed-floating-elements/

回答by ljgww

This is my final code .... (based on previous fixes, thank you big time for headstart, saved a lot of time experimenting). What bugged me was scrolling up, as well as scrolling down ... :)

这是我的最终代码....（基于以前的修复，感谢您的大力支持，节省了大量的实验时间）。困扰我的是向上滚动和向下滚动...... :)

it always makes me wonder how jquery can be elegant!!!

它总是让我想知道 jquery 是如何优雅的！！！

$(document).ready(function(){

    //run once
    var el=$('#scrolldiv');
    var originalelpos=el.offset().top; // take it where it originally is on the page

    //run on scroll
     $(window).scroll(function(){
        var el = $('#scrolldiv'); // important! (local)
        var elpos = el.offset().top; // take current situation
        var windowpos = $(window).scrollTop();
        var finaldestination = windowpos+originalelpos;
        el.stop().animate({'top':finaldestination},500);
     });

});

回答by Artur Keeven

Here is mine solution (hope it is plug-n-play enoughtoo):

这是我的解决方案（希望它也足够即插即用）：

1. Copy JS code part
2. Add 'slide-along-scroll' class to element you want
3. Make pixel-perfect corrections in JS-code
4. Hope you will enjoy it!

1. 复制JS代码部分
2. 将 'slide-along-scroll' 类添加到您想要的元素
3. 在 JS 代码中进行像素完美的校正
4. 希望你会喜欢它！

// SlideAlongScroll
var SlideAlongScroll = function(el) {
  var _this = this;
  this.el = el;
  // elements original position
  this.elpos_original = el.parent().offset().top;  
  // scroller timeout
  this.scroller_timeout;
  // scroller calculate function
  this.scroll = function() {
    // 20px gap for beauty
    var windowpos = $(window).scrollTop() + 20;
    // targeted destination
    var finaldestination = windowpos - this.elpos_original;
    // define stopper object and correction amount
    var stopper = ($('.footer').offset().top); // $(window).height() if you dont need it
    var stophere = stopper - el.outerHeight() - this.elpos_original - 20;
    // decide what to do
    var realdestination = 0;
    if(windowpos > this.elpos_original) {
      if(finaldestination >= stophere) {
        realdestination = stophere;
      } else {
        realdestination = finaldestination;
      }
    }
    el.css({'top': realdestination });
  };
  // scroll listener
  $(window).on('scroll', function() {
    // debounce it
    clearTimeout(_this.scroller_timeout);
    // set scroll calculation timeout
    _this.scroller_timeout = setTimeout(function() { _this.scroll(); }, 300);
  });
  // initial position (in case page is pre-scrolled by browser after load)
  this.scroll();
};
// init action, little timeout for smoothness
$(document).ready(function() {
  $('.slide-along-scroll').each(function(i, el) {
    setTimeout(function(el) { new SlideAlongScroll(el); }, 300, $(el));
  });
});

/* part you need */
.slide-along-scroll {
  padding: 20px;
  background-color: #CCCCCC;
 transition: top 300ms ease-out;
 position: relative;
}
/* just demo */
div {  
  box-sizing: border-box;
}
.side-column {
  float: left;
  width: 20%;    
}
.main-column {
  padding: 20px;
  float: right;
  width: 75%;
  min-height: 1200px;
  background-color: #EEEEEE;
}
.body {  
  padding: 20px 0;  
}
.body:after {
  content: ' ';
  clear: both;
  display: table;
}
.header {
  padding: 20px;
  text-align: center;
  border-bottom: 2px solid #CCCCCC;  
}
.footer {
  padding: 20px;
  border-top: 2px solid #CCCCCC;
  min-height: 300px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
  <div class="header">
      <h1>Your super-duper website</h1>
  </div>
  <div class="body">  
    <div class="side-column">
        <!-- part you need -->
        <div class="slide-along-scroll">
            Side menu content
            <ul>
               <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
               <li>Aliquam tincidunt mauris eu risus.</li>
               <li>Vestibulum auctor dapibus neque.</li>
            </ul>         
        </div>
    </div>
    <div class="main-column">
        Main content area (1200px)
    </div>
  </div>
  <div class="footer">
      Footer (slide along is limited by it)
  </div>
</div>

回答by Adan Archila

I needed the div to stop when it reach a certain object, so i did it like this:

我需要 div 在到达某个对象时停止，所以我这样做了：

var el = $('#followdeal');
    var elpos_original = el.offset().top;
    $(window).scroll(function(){
        var elpos = el.offset().top;
        var windowpos = $(window).scrollTop();
        var finaldestination = windowpos;
        var stophere = ( $('#filtering').offset().top ) - 170;
        if(windowpos<elpos_original || windowpos>=stophere) {
            finaldestination = elpos_original;
            el.stop().animate({'top':10});
        } else {
            el.stop().animate({'top':finaldestination-elpos_original+10},500);
        }
    });

回答by Hugosolar

That code doesn't work very well i fixed it a little bit

该代码不能很好地工作，我稍微修复了它

var el = $('.caja-pago');
var elpos_original = el.offset().top;

 $(window).scroll(function(){
     var elpos = el.offset().top;
     var windowpos = $(window).scrollTop();
     var finaldestination = windowpos;
     if(windowpos<elpos_original) {
         finaldestination = elpos_original;
         el.stop().animate({'top':400},500);
     } else {
         el.stop().animate({'top':windowpos+10},500);
     }
 });

回答by Mahmoud Ali Kassem

This one is same on facebook:

这个在facebook上是一样的：

<script>
var valX = $(window).scrollTop();
function syncScroll(target){
 var valY = $(window).scrollTop();
 var difYX = valY - valX;
 var targetX = $(target).scrollTop();
 if(valY > valX){
  $(target).scrollTop(difYX);
 }
 if(difYX <= 0){
  $(target).scrollTop(-20);
 }
}

$(window).scroll(function(){
 syncScroll('#demo');
})
</script>

body{
  margin:0;
  padding:0;
  height:100%;
}
#demo{
  position:fixed;
  height:100vh;
  overflow:hidden;
  width:40%;
}
#content{
  position:relative;
  float:right;
  width:60%;
  color:red; 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<body>
  <div id="demo">
    <ul>
      <li>
        <p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
      </li>
      <li>
        <p>
"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
        </p>
      </li>  
      <li>
        <p>
"But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
        </p>
      </li>
    <ul>
  </div>
  <div id="content">
    <ul>
      <li>
        <p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
      </li>
      <li>
        <p>
"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
        </p>
      </li>  
      <li>
        <p>
"But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
        </p>
      </li>
      <li>
        <p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
      </li>
      <li>
        <p>
"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
        </p>
      </li>  
      <li>
        <p>
"But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
        </p>
      </li>
      <li>
        <p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
      </li>
      <li>
        <p>
"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
        </p>
      </li>  
      <li>
        <p>
"But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
        </p>
      </li>
      <li>
        <p>"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."</p>
      </li>
      <li>
        <p>
"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
        </p>
      </li>  
      <li>
        <p>
"But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
        </p>
      </li>
    <ul>
   </div>   
</body

回答by Brian Powell

I wrote a relatively simple answer for this.

我为此写了一个相对简单的答案。

I have a table that's using one of the "sticky table header" plugins to stick right below a particular div on my page, but the menu to the left of the table didn't stick (as it's not part of the table.)

我有一个表格，它使用“粘性表格标题”插件之一粘贴在我页面上特定 div 的正下方，但表格左侧的菜单没有粘贴（因为它不是表格的一部分。）

For my purposes, I knew the div that needed "stickiness" was always going to start at 385 pixels below the top of the window, so I created an empty div right above that:

出于我的目的，我知道需要“粘性”的 div 总是从窗口顶部下方 385 像素处开始，所以我在它的正上方创建了一个空 div：

<div id="stopMenu" class="stopMenu"></div>

Then ran this:

然后运行这个：

$(window).scroll(function(){   
   if ( $(window).scrollTop() > 385 ) {
    extraPadding = $(window).scrollTop() - 385;
    $('#stopMenu').css( "padding-top", extraPadding );
   } else {
     $('#stopMenu').css( "padding-top", "0" );
   }
});

As the user scrolls, it adds whatever the value of $(window).scrollTop()is to the integer 385, then adds that value to the stopMenudiv that's above the thing I want to stay focused.

当用户滚动时，它将任何值添加$(window).scrollTop()到 integer 385，然后将该值添加到stopMenu我想要保持关注的东西上方的 div 中。

In the event the user scrolls all the way back up, I just set the extra padding to 0.

如果用户一直向上滚动，我只需将额外的填充设置为 0。

This doesn't require the user to do anything IN CSS particularly, but it's kind of a nice effect to make a small delay, so I put the class="stopMenu"in as well:

这不需要用户特别在 CSS 中做任何事情，但是稍微延迟是一种不错的效果，所以我class="stopMenu"也输入了：

.stopMenu {
  .transition: all 0.1s;
}