How to scroll to the end of messages?

[andreasotto]

Hi, i love ant-design/x and just started to work with it.

I would like to know: If there is a large number of messages in a conversation, how can i automatically start with the latest messages and then only load more messages when i scroll up (reverse infinite scroll).

⛔️ Currently when i open a conversation only the oldest messages are shown and i manually have to scroll down a long list to the end, what is not what a user expects.

I would be very happy to receive specific tips or suggestions on how I can solve this.

[petercat-assistant[bot]]

To achieve a reverse infinite scroll where you start with the latest messages and load more messages as you scroll up, you can follow these general steps:

1. Initial Load with Latest Messages:

   • When loading the messages for the first time, fetch the latest messages from your data source. This might involve querying your database or API to get the most recent messages.

2. Scroll to Bottom:

   • Once you have the latest messages, programmatically scroll to the bottom of the message container. This can be done using JavaScript by setting the scroll position to the maximum scroll height.

3. Implement Reverse Infinite Scroll:

   • Attach a scroll event listener to the message container.
   • Detect when the user scrolls to the top of the container.
   • When the top is reached, fetch the next batch of older messages and prepend them to the message list.

4. Maintain Scroll Position:

   • After loading more messages, ensure that the scroll position is maintained so that the user doesn't experience a jump in the view. This can be done by calculating the height of the newly added messages and adjusting the scroll position accordingly.

Here's a basic example using JavaScript:

const messageContainer = document.getElementById('messageContainer');

// Function to scroll to the bottom
function scrollToBottom() {
    messageContainer.scrollTop = messageContainer.scrollHeight;
}

// Function to load more messages
function loadMoreMessages() {
    // Fetch older messages and prepend to the container
    // Adjust scroll position to maintain view
}

// Initial load
scrollToBottom();

// Attach scroll event listener
messageContainer.addEventListener('scroll', () => {
    if (messageContainer.scrollTop === 0) {
        loadMoreMessages();
    }
});

This is a general approach and might need to be adapted based on the specific framework or library you are using with ant-design/x. If you are using a specific component from ant-design/x, please let me know, and I can provide more tailored advice.

If you have any further questions or need more specific guidance, feel free to ask!

🪧 Tips

For further assistance, please describe your question in the comments and @petercat-assistant to start a conversation with me.

[KellaTe]

Hi, i love ant-design/x and just started to work with it.

I would like to know: If there is a large number of messages in a conversation, how can i automatically start with the latest messages and then only load more messages when i scroll up (reverse infinite scroll).

⛔️ Currently when i open a conversation only the oldest messages are shown and i manually have to scroll down a long list to the end, what is not what a user expects.

I would be very happy to receive specific tips or suggestions on how I can solve this.

Use pagination！ if you use antd-mobile，you can use PullToRefresh ，when scroll ，unshift datas。 also ，position of scroll it's a problem 。you can use cusotm attribute ，such as data-message-id for last scroll messageItem in <Bubble.List item={ displayMessageList.map(message => { return { ..., content:...., 'data-message-id': message.id } }) }> loadMoreData or useEffect displayedMessages, const messageToScrollTo = listRef.current?.nativeElement?.querySelector([data-message-id="${xxx}"]); messageToScrollTo.scrollIntoView(),

[gaoyouAwait]

Add ref to the Bubble.List component, and then use the method in the figure to scroll to the bottom

for example bubbleListRef.current.scrollTo({ offset: bubbleListRef.current.nativeElement.scrollHeight })