How to automatically scroll to the bottom using jquery/css

I've recently developed a chatroom using li elements, but I'm encountering an issue where the chat doesn't stick to the bottom once it reaches a certain number of messages. I suspect it has something to do with the height settings, but I can't seem to pinpoint the exact problem. Here's a snippet of my HTML code:

<div id="chat-main">
  <ul id="chat-list">
    //I use ajax to dynamically add <li> elements here
  </ul>
</div>
<div id="message-panel">
  <form class="form-inline" id="messageForm">
    <input id="message-value" type="text" autocomplete="off" maxlength="510" placeholder="Type your message...">
  </form>
</div>

Below is a snippet of my CSS that might be relevant:

#chat-main {
  height: 84%;
  border: 2px solid #d8d7cf;
}

#chat-list {
  height: 100%;
  overflow-y: scroll;
}

#chat-main>ul {
  padding-left: 10px;
  list-style-type: none;
}

In order to handle scrolling, I have this jQuery code in place:

$("#chat-list").animate({ scrollTop: $(document).height() }, "slow")

I'm currently at a loss and would appreciate any insights or suggestions on what could be causing this issue.

Edit: For further clarity, here's a link to a jsfiddle with additional test data to illustrate the problem:

http://jsfiddle.net/L8msx/19/

Answer №1

Utilizing the height of the document may not appear to be intuitive, but it accurately captures the overflow of the chat:

http://jsfiddle.net/1yLzkgw8/

let chatBox = $("#chat-list"),
overflowAmount = chatBox[0].scrollHeight - chat.height(); 

chatBox.animate({scrollTop: overflowAmount}, 'slow');

When obtaining scrollHeight, vanilla JavaScript is utilized so the DOM node itself is selected with [0].

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