滚动到 div 的底部？

I am creating a chat using ajax requests in rails and I'm trying to get a 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?

Here's what I use on my site:

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

This is much easier if you're using jQuery:

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

using jQuery animate:

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

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

Works from jQuery 1.6

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

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

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

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

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;

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.

Newer method :

this.scrollIntoView(false);

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);

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

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

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.

You can use the following code:

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

To perform a smooth scroll, use the following code (require jQuery):

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

See the sample on JSFiddle

And that's how it works:

Ref: scrollTop, scrollHeight, clientHeight

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".

Javascript or jquery:

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

Css:

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

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.

Java Script:

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

Scrolls to the last line of the content present.

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);

$('#divToScrollToTheEnd').scrollTop(Number.MAX_SAFE_INTEGER);