What is the best way to determine the ideal scrollTop value?

When loading content through ajax into #list, I am determining the necessary scroll based on the height of #list, but I want to reduce it by 200px. After the ajax call is complete, I execute:

var pos = jQuery("#list").innerHeight() - 200;

Once the height is calculated and stored in a variable, I then perform:

$("body, html").animate({scrollTop: pos}, 1000).offset().top;

However, despite trying to subtract 200 pixels, the scrolling animation does not take that into account and scrolls to the top without this adjustment.

jqueryscroll

Answer №1

Understanding the scroll position means knowing where the browser window starts to show content. If your browser window is over 200px in height, it will automatically scroll to the bottom of the page. It's important to factor in the height of the window when handling scrolling behaviors.

If you want to create a 200px space below the window:

var pos = jQuery("#list").innerHeight() - 200 - window.innerHeight;
if(pos < 0) pos = 0;

Answer №2

I realized that the problem didn't lie with using the .offset.top() function. It was actually my calculation of how far I needed to scroll. I forgot to account for the height of the header and also did not subtract the height of the last content row in my particular case. So, rather than being equal to the value of pos as mentioned in my original question, it was significantly less, more like dividing by 2 the height of #list.

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