Scrolling down a jQuery div after each new item is added.OR

I have a div acting as a chat feature, where messages are appended based on user actions. I am trying to make it so that the div automatically scrolls down after each message is added, but I'm encountering some issues with this functionality.

You can view the code on this fiddle: https://jsfiddle.net/mfj1ub8c/

I suspect that the problem lies in the delays, fade-in effects, and hide methods used during each append operation, but these are necessary for the desired visual effect.

Do you have any suggestions on how to address this issue?

javascriptjqueryhtmlcss

Answer №1

One issue is that the scrollDown function is triggered before the element is actually displayed (with a fadeIn effect), causing the scroll height to remain unchanged. To address this, consider calling the scrollDown function after the fadeIn effect has completed. This way, you can ensure that the scrolling occurs only when the element is visible but still transparent (opacity: 0). If you are using jQuery 1.8 or newer, explore using the start option.

For a working example, take a look at this fiddle: https://jsfiddle.net/mfj1ub8c/2/

Additionally, it seems like you may be overshooting your scrollTop value. Although it may not lead to issues in this case, it's recommended to calculate the scrollTop as the entire height minus the visible height:

$('#chat').prop("scrollHeight") - $('#chat').height()

Answer №2

Ensure that you only invoke the scrollDown function after the completion of the fadeIn function. Utilize the complete callback parameter of fadeIn for this purpose.

For example:

.fadeIn(500, scrollDown))

View the corrected demonstration here: https://jsfiddle.net/mfj1ub8c/1/

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