1099

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?

2
  • In many cases this can be achieved with CSS-only. See this answer. Commented Aug 21, 2021 at 16:39
  • You can simply use Jquery to achieve this: code $(document).ready(function() { var chatMessagesDiv = $('#scroll'); chatMessagesDiv.scrollTop(chatMessagesDiv[0].scrollHeight); }); Commented Jul 16, 2023 at 17:12

35 Answers 35

1774

Here's what I use on my site:

var objDiv = document.getElementById("your_div");
objDiv.scrollTop = objDiv.scrollHeight;
Sign up to request clarification or add additional context in comments.

11 Comments

is this method ok with all browsers?
@PaulDinh: I just looked into this and there is an issue with IE7 and lower using scrollHeight. There does seem to be a work around for IE7 here.
why not scrollTopMax instead of scrollHeight?
The 'modern' way is to use Element.scrollIntoView() -- developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
@aiven scrollTopMax is non standard, see caniuse.com/mdn-api_element_scrolltopmax
|
395

This is much easier if you're using jQuery scrollTop:

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

2 Comments

you need [0] to get dom element from jquery element to get scrollHeight
Without repeating yourself: $("#mydiv").scrollTop(function() { return this.scrollHeight; });
196

Try the code below:

const scrollToBottom = (id) => {
    const element = document.getElementById(id);
    element.scrollTop = element.scrollHeight;
}

You can also use Jquery to make the scroll smooth:

const scrollSmoothlyToBottom = (id) => {
    const element = $(`#${id}`);
    element.animate({
        scrollTop: element.prop("scrollHeight")
    }, 500);
}

Here is the demo

Here's how it works:

enter image description here

Ref: scrollTop, scrollHeight, clientHeight

Comments

97

using jQuery animate:

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

1 Comment

Notice how this answer uses .stop(), which prevents issues with multiple animations.
79

Newer method that works on all current browsers:

this.scrollIntoView(false);

6 Comments

This should be the accepted answer as the older methods do not work anymore
That would be the case if "this" is something in the div that can be scrolled to
The method scrollIntoView is triggered on a child element inside a parent container. So how to use it to: scroll parent to bottom (as asked in the original question).
You can use scrollIntoView({ behavior: "smooth", block: "end" });
This scrolls the whole page, not the targeted element (chrome)
|
49

alternative solution

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

1 Comment

This is better if you want the user to notice what's happening. +1
39
var mydiv = $("#scroll");
mydiv.scrollTop(mydiv.prop("scrollHeight"));

Works from jQuery 1.6

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

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

Comments

39

smooth scroll with Javascript:

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

Comments

18

Method with no JavaScript required (2023)

Here's a method that doesn't require any JavaScript at all, and uses pure (Flexbox) CSS. I've explained the method in a bit more detail over here.

The trick is to put the items in a 'content' element, which is wrapped inside a column-reverse flexbox element, which acts as the 'scroller'. Because the items are in another ('content') container, they don't get 'flipped' but instead always line up to the bottom. This, in fact, makes the scroller scrolled to the bottom whenever stuff is added.

Advantages of this method

Aside from not relying on JavaScript, a big advantage of this method is that when the user has started scrolling the list, the scroll position remains fixed to the point where the user scrolled to. This prevents annoying content-jumping when new items are added. As soon as the user scrolls back to the bottom again, the list will stay scrolled to the bottom when updated.

Breakdown, click for demo

Demo

Note: the JavaScript in the below demo is only required for the demo itself (to add items to the list, and see what happens).

let scrollerContent = document.getElementById('scrollerContent');

document.getElementById('addItems').addEventListener('click', function() {
  let newChild = scrollerContent.lastElementChild.cloneNode(true);
  newChild.innerHTML = "Item " + (scrollerContent.children.length + 1);
  scrollerContent.appendChild(newChild);
});
.scroller {
  overflow: auto;
  height: 100px;
  display: flex;
  flex-direction: column-reverse;
}

.scroller .scroller-content .item {
  height: 20px;
  transform: translateZ(0); /* fixes a bug in Safari iOS where the scroller doesn't update */
}
<div class="scroller">
  <div class="scroller-content" id="scrollerContent">
    <div class="item">Item 1</div>
    <div class="item">Item 2</div>
    <div class="item">Item 3</div>
    <div class="item">Item 4</div>
    <div class="item">Item 5</div>
    <div class="item">Item 6</div>
    <div class="item">Item 7</div>
    <div class="item">Item 8</div>
    <div class="item">Item 9</div>
    <div class="item">Item 10</div>
  </div>
</div>
<br/><br/>
<button id="addItems">Add more items</button>

3 Comments

This was enlightening and really cool trick. works perfectly
I am using this trick for fun and profit but I don't know to have content jumping when I actually want to. This is a chat interface so a new message from someone should not scroll to bottom so this is all good but how do I do scroll to bottom when sending a message myself ?
Works like a charm! thanks!
16

If you don't want to rely on scrollHeight, the following code helps:

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

2 Comments

looks like a hack. what does the 1000000 number mean?
Looks like the 1000000 is just a large number. By passing an extremely large number the browser should cap it to the height of the the div.
12

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

1 Comment

with setTimeout(), its working fine. Worked with angular 9. Saved my day.
12

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>

1 Comment

Note that this will keep the dynamically generated element at the bottom, so if you scroll up, the wrapper will automatically scroll back down to the bottom.
10

Java Script:

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

Scrolls to the last line of the content present.

Comments

9

You can use the HTML DOM scrollIntoView Method like this:

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

Comments

7

Javascript or jquery:

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

Css:

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

Comments

6

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.

Comments

6

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' });

1 Comment

Beautiful and simple to implement, exactly what I wanted. Thanks.
5

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);

Comments

5

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/

2 Comments

how to get dynamic id? like in <div class="abc"><div data-bind=attr : {'id': myId } ></div></div> In this code myId is a variable. How can I access this id in script.
I'm not quite sure I understand your question. In my example, "myId" is the id of the scroll container. Do you want to create more than one area where the user can scroll ?
4

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.

3 Comments

I suspect $scope.$apply(callback) would work as well as this forces a digest and re-evaluation of the view.
Thank you! I was really wondering why I couldn't get it to work and the $timeout was the issue.
@Wayferer same setTimeout(function() { ... }, n)
4

This will let you scroll all the way down regards the document height

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

Comments

4

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".

Comments

4

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/[email protected]/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>

Comments

4

Why not use simple CSS to do this? The trick is to use this in your class:

display: flex;
flex-direction: column-reverse;

Here's a working example.

2 Comments

The problem with column-reverse is app logic that could append data now has to prepend data. That can get very messy very fast. For example, in a chat program, try collapsing all of the messages from a single user to show the user icon only once until a different user sends a message. Very easy with append logic. Much harder with prepend logic.
@OXiGEN This is not true. column-reverse only reverses the display of the elements. Their order within parent element is not changed. Although-- this does not address OP's specific question of staying scrolling down.
3

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;

Comments

2

Scroll to the last element inside the div:

myDiv.scrollTop = myDiv.lastChild.offsetTop

Comments

2

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.

2 Comments

should it be "overflow-anchor: auto" instead?
still poor support
1

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);

Comments

1

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>

Comments

0

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.

Comments

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