Tips for keeping the scrollbar permanently at the bottom in JavaScript?

I am trying to implement a feature where a div always scrolls down automatically.

scrollDown(){
  var chat = this.conversation;
  this.conversation.scrollTop = chat.scrollHeight;
}

checkKeyPress(e){
  if (e.key == "Enter") {
    this.scrollDown();
    ...
  }
}

            <div id="scroll" ref={(conversation) => this.conversation = conversation} style={{display: "block",overflowY: "auto", overflowX: "hidden", position: "absolute", ...}}>
              ...
            </div>

Here is a link to a GIF showcasing the error I am experiencing. Please pay attention to the sequence of events and where the issue occurs: . Thank you!

Note: The verifyKeyPress function has additional functionality for sending messages, but I have omitted it due to its length.


I figured out the problem. The scrollDown function should be included in the callback of another function that was not displayed here. Apologies for the confusion, it would have been difficult for someone to assist me without all the information. Despite my limited experience, thank you for your help.

Answer №1

It seems like there may be some confusion about what you're trying to accomplish. Do you want the program to scroll down one screen each time you press enter? Or are you looking to jump to the very bottom of the entire page when you press enter?

If it's the first case, you'll need to calculate the scrollTop value based on the view height and the pageNum in order to move down one full screen with each press of the return key. It can be a bit tricky to get it perfectly centered on the top item though.

In the second scenario, I believe you'd have to adjust the scroll height by subtracting the view height from the page height. These values are more general terms, so I don't remember the exact JavaScript or CSS variable names off the top of my head, but they should be easy to find with a quick search.

If you could provide more clarity on the desired behavior, I would be happy to explore this further for you.

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