滚动到 div 的底部？

Question

I am creating a chat using Ajax requests and I'm trying to get messages div to scroll to the bottom without much luck.

I am wrapping everything in this div:

#scroll {
    height:400px;
    overflow:scroll;
}

Is there a way to keep it scrolled to the bottom by default using JS?

Is there a way to keep it scrolled to the bottom after an ajax request?

Answer 1

Here's what I use on my site:

var objDiv = document.getElementById("your_div");
objDiv.scrollTop = objDiv.scrollHeight;

Answer 2

如果您使用jQuery scrollTop ，这会容易得多：

$("#mydiv").scrollTop($("#mydiv")[0].scrollHeight);

Answer 3

You can try the code below:

function scrollToBottom (id) {
   var div = document.getElementById(id);
   div.scrollTop = div.scrollHeight - div.clientHeight;
}

To perform a smooth scroll with JQuery:

function scrollSmoothToBottom (id) {
   var div = document.getElementById(id);
   $('#' + id).animate({
      scrollTop: div.scrollHeight - div.clientHeight
   }, 500);
}

See the example on JSFiddle

Here's why this works:

Ref: scrollTop , scrollHeight , clientHeight

Answer 4

using jQuery animate :

$('#DebugContainer').stop().animate({
  scrollTop: $('#DebugContainer')[0].scrollHeight
}, 800);

Answer 5

适用于所有当前浏览器的较新方法：

this.scrollIntoView(false);

Answer 6

var mydiv = $("#scroll");
mydiv.scrollTop(mydiv.prop("scrollHeight"));

Works from jQuery 1.6

https://api.jquery.com/scrollTop/

http://api.jquery.com/prop/

Answer 7

使用 Javascript平滑滚动：

document.getElementById('messages').scrollIntoView({ behavior: 'smooth', block: 'end' });

Answer 8

If your project targets modern browsers , you can now use CSS Scroll Snap to control the scrolling behavior, such as keeping any dynamically generated element at the bottom.

 .wrapper > div { background-color: white; border-radius: 5px; padding: 5px 10px; text-align: center; font-family: system-ui, sans-serif; }.wrapper { display: flex; padding: 5px; background-color: #ccc; border-radius: 5px; flex-direction: column; gap: 5px; margin: 10px; max-height: 150px; /* Control snap from here */ overflow-y: auto; overscroll-behavior-y: contain; scroll-snap-type: y mandatory; }.wrapper > div:last-child { scroll-snap-align: start; }

 <div class="wrapper"> <div>01</div> <div>02</div> <div>03</div> <div>04</div> <div>05</div> <div>06</div> <div>07</div> <div>08</div> <div>09</div> <div>10</div> </div>

Answer 9

如果您不想依赖scrollHeight ，以下代码会scrollHeight帮助：

$('#scroll').scrollTop(1000000);

Answer 10

Java Script:

document.getElementById('messages').scrollIntoView(false);

Scrolls to the last line of the content present.

Answer 11

My Scenario: I had an list of string, in which I had to append a string given by a user and scroll to the end of the list automatically. I had fixed height of the display of the list, after which it should overflow.

I tried @Jeremy Ruten's answer, it worked, but it was scrolling to the (n-1)th element. If anybody is facing this type of issue, you can use setTimeOut() method workaround. You need to modify the code to below:

setTimeout(() => {
    var objDiv = document.getElementById('div_id');
    objDiv.scrollTop = objDiv.scrollHeight
}, 0)

Here is the StcakBlitz link I have created which shows the problem and its solution : https://stackblitz.com/edit/angular-ivy-x9esw8

Answer 12

Javascript or jquery:

var scroll = document.getElementById('messages');
   scroll.scrollTop = scroll.scrollHeight;
   scroll.animate({scrollTop: scroll.scrollHeight});

Css:

 .messages
 {
      height: 100%;
      overflow: auto;
  }

Answer 13

You can use the HTML DOM scrollIntoView Method like this:

var element = document.getElementById("scroll");
element.scrollIntoView();

Answer 14

Using jQuery, scrollTop is used to set the vertical position of scollbar for any given element. there is also a nice jquery scrollTo plugin used to scroll with animation and different options ( demos )

var myDiv = $("#div_id").get(0);
myDiv.scrollTop = myDiv.scrollHeight;

if you want to use jQuery's animate method to add animation while scrolling down, check the following snippet:

var myDiv = $("#div_id").get(0);
myDiv.animate({
    scrollTop: myDiv.scrollHeight
  }, 500);

Answer 15

Found this really helpful, thank you.

For the Angular 1.X folks out there:

angular.module('myApp').controller('myController', ['$scope', '$document',
  function($scope, $document) {

    var overflowScrollElement = $document[0].getElementById('your_overflow_scroll_div');
    overflowScrollElement[0].scrollTop = overflowScrollElement[0].scrollHeight;

  }
]);

Just because the wrapping in jQuery elements versus HTML DOM elements gets a little confusing with angular.

Also for a chat application, I found making this assignment after your chats were loaded to be useful, you also might need to slap on short timeout as well.

Answer 16

I have encountered the same problem, but with an additional constraint: I had no control over the code that appended new elements to the scroll container. None of the examples I found here allowed me to do just that. Here is the solution I ended up with .

It uses Mutation Observers ( https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver ) which makes it usable only on modern browsers (though polyfills exist)

So basically the code does just that :

var scrollContainer = document.getElementById("myId");

// Define the Mutation Observer
var observer = new MutationObserver(function(mutations) {

  // Compute sum of the heights of added Nodes
  var newNodesHeight = mutations.reduce(function(sum, mutation) {
      return sum + [].slice.call(mutation.addedNodes)
        .map(function (node) { return node.scrollHeight || 0; })
        .reduce(function(sum, height) {return sum + height});
  }, 0);

  // Scroll to bottom if it was already scrolled to bottom
  if (scrollContainer.clientHeight + scrollContainer.scrollTop + newNodesHeight + 10 >= scrollContainer.scrollHeight) {
    scrollContainer.scrollTop = scrollContainer.scrollHeight;
  }

});

// Observe the DOM Element
observer.observe(scrollContainer, {childList: true});

I made a fiddle to demonstrate the concept : https://jsfiddle.net/j17r4bnk/

Answer 17

small addendum: scrolls only, if last line is already visible. if scrolled a tiny bit, leaves the content where it is (attention: not tested with different font sizes. this may need some adjustments inside ">= comparison"):

var objDiv = document.getElementById(id);
var doScroll=objDiv.scrollTop>=(objDiv.scrollHeight-objDiv.clientHeight);                   

// add new content to div
$('#' + id ).append("new line at end<br>"); // this is jquery!

// doScroll is true, if we the bottom line is already visible
if( doScroll) objDiv.scrollTop = objDiv.scrollHeight;

Answer 18

Just as a bonus snippet. I'm using angular and was trying to scroll a message thread to the bottom when a user selected different conversations with users. In order to make sure that the scroll works after the new data had been loaded into the div with the ng-repeat for messages, just wrap the scroll snippet in a timeout.

$timeout(function(){
    var messageThread = document.getElementById('message-thread-div-id');
    messageThread.scrollTop = messageThread.scrollHeight;
},0)

That will make sure that the scroll event is fired after the data has been inserted into the DOM.

Answer 19

这将让您一直向下滚动文档高度

$('html, body').animate({scrollTop:$(document).height()}, 1000);

Answer 20

You can also, using jQuery, attach an animation to html,body of the document via:

$("html,body").animate({scrollTop:$("#div-id")[0].offsetTop}, 1000);

which will result in a smooth scroll to the top of the div with id "div-id".

Answer 21

alternative solution

function scrollToBottom(element) {
  element.scroll({ top: element.scrollHeight, behavior: 'smooth' });
}

Answer 22

Like you, I'm building a chat app and want the most recent message to scroll into view. This ultimately worked well for me:

//get the div that contains all the messages
let div = document.getElementById('message-container');

//make the last element (a message) to scroll into view, smoothly!
div.lastElementChild.scrollIntoView({ behavior: 'smooth' });

Answer 23

Why not use simple CSS to do this?

The trick is to use display: flex; and flex-direction: column-reverse;

Here is a working example. https://codepen.io/jimbol/pen/YVJzBg

Answer 24

A very simple method to this is to set the scroll to to the height of the div.

var myDiv = document.getElementById("myDiv");
window.scrollTo(0, myDiv.innerHeight);

Answer 25

滚动到 div 中的最后一个元素：

myDiv.scrollTop = myDiv.lastChild.offsetTop

Answer 26

On my Angular 6 application I just did this:

postMessage() {
  // post functions here
  let history = document.getElementById('history')
  let interval    
  interval = setInterval(function() {
    history.scrollTop = history.scrollHeight
    clearInterval(interval)
  }, 1)
}

The clearInterval(interval) function will stop the timer to allow manual scroll top / bottom.

Answer 27

I know this is an old question, but none of these solutions worked out for me. I ended up using offset().top to get the desired results. Here's what I used to gently scroll the screen down to the last message in my chat application:

$("#html, body").stop().animate({
     scrollTop: $("#last-message").offset().top
}, 2000);

I hope this helps someone else.

Answer 28

I use the difference between the Y coordinate of the first item div and the Y coordinate of the selected item div. Here is the JavaScript/JQuery code and the html:

 function scrollTo(event){ // In my proof of concept, I had a few <button>s with value // attributes containing strings with id selector expressions // like "#item1". let selectItem = $($(event.target).attr('value')); let selectedDivTop = selectItem.offset().top; let scrollingDiv = selectItem.parent(); let firstItem = scrollingDiv.children('div').first(); let firstItemTop = firstItem.offset().top; let newScrollValue = selectedDivTop - firstItemTop; scrollingDiv.scrollTop(newScrollValue); }

 <div id="scrolling" style="height: 2rem; overflow-y: scroll"> <div id="item1">One</div> <div id="item2">Two</div> <div id="item3">Three</div> <div id="item4">Four</div> <div id="item5">Five</div> </div>

Answer 29

You can use the Element.scrollTo() method.

It can be animated using the built-in browser/OS animation, so it's super smooth.

 function scrollToBottom() { const scrollContainer = document.getElementById('container'); scrollContainer.scrollTo({ top: scrollContainer.scrollHeight, left: 0, behavior: 'smooth' }); } // initialize dummy content const scrollContainer = document.getElementById('container'); const numCards = 100; let contentInnerHtml = ''; for (let i=0; i<numCards; i++) { contentInnerHtml += `<div class="card mb-2"><div class="card-body">Card ${i + 1}</div></div>`; } scrollContainer.innerHTML = contentInnerHtml;

 .overflow-y-scroll { overflow-y: scroll; }

 <link href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" rel="stylesheet"/> <div class="d-flex flex-column vh-100"> <div id="container" class="overflow-y-scroll flex-grow-1"></div> <div> <button class="btn btn-primary" onclick="scrollToBottom()">Scroll to bottom</button> </div> </div>

Answer 30

Css only:

.scroll-container {
  overflow-anchor: none;
}

Makes it so the scroll bar doesn't stay anchored to the top when a child element is added. For example, when new message is added at the bottom of chat, scroll chat to new message.

Answer 31

use :

var element= $('element');
var maxScrollTop = element[0].scrollHeight - element.outerHeight();
element.scrollTop(maxScrollTop);

or check scroll to bottom :

    var element = $(element);
    var maxScrollTop = element[0].scrollHeight - element.outerHeight();
    element.on('scroll', function() {
        if ( element.scrollTop() >= maxScrollTop ) {
            alert('scroll to bottom');
        }
    });

Answer 32

If this is being done for scrolling to the bottom of chat window, do the following

The idea of scrolling to a particular div in the chat was the following

1) Each chat div consisting of Person, time and message is run in a for loop with class chatContentbox

2) querySelectorAll finds all such arrays. It could be 400 nodes (400 chats)

3) go to the last one

4) scrollIntoView()

let lastChatBox = document.querySelectorAll('.chatContentBox'); 
lastChatBox = lastChatBox[lastChatBox.length-1]; 
lastChatBox.scrollIntoView(); 

Answer 33

Sometimes the most simple is the best solution: I do not know if this will help, it helped me to scroll it were ever I wanted too. The higher the "y=" is,the more down it scrolls and of course "0" means top, so there for example "1000" could be bottom, or "2000" or "3000" and so on, depending how long your page is. This usually works in a button with onclick or onmouseover.

window.scrollTo(x=0,y=150);

Answer 34

I am creating a chat using Ajax requests and I'm trying to get messages div to scroll to the bottom without much luck.

I am wrapping everything in this div:

#scroll {
    height:400px;
    overflow:scroll;
}

Is there a way to keep it scrolled to the bottom by default using JS?

Is there a way to keep it scrolled to the bottom after an ajax request?