How can I automatically scroll a div to a specific element within it without scrolling the entire page?

Scrolling to an Element within a Div

You aim to program a scrolled div to automatically scroll to an element within it upon clicking. Utilizing scrollIntoView(true) seems to scroll the entire page, leaving you puzzled.

Solution:

To address this issue, you need to determine the top offset of the target element relative to its parent, the scrolling div container. This is achieved through:

<code class="js">var myElement = document.getElementById('element_within_div');
var topPos = myElement.offsetTop;</code>

The topPos now contains the pixel distance between the div's top and the element you want visible.

Next, instruct the div to scroll to that location using scrollTop:

<code class="js">document.getElementById('scrolling_div').scrollTop = topPos;</code>

In Prototype JS, this translates to:

<code class="js">var posArray = $('element_within_div').positionedOffset();
$('scrolling_div').scrollTop = posArray[1];</code>

This action scrolls the div to align the specified element at the top, or as close as possible if scrolling doesn't permit reaching the top.

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