Why Does `document.body.scrollTop` Return 0 in IE and How Can I Fix It?-CSS Tutorial-php.cn

Why Does `document.body.scrollTop` Return 0 in IE and How Can I Fix It?

Linda Hamilton

Release： 2024-11-12 09:28:01

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Why Does `document.body.scrollTop` Return 0 in IE and How Can I Fix It?

Getting Accurate Scroll Position in IE Using document.body.scrollTop

In IE, accessing the scroll position through document.body.scrollTop consistently returns 0, even when scrolling. This behavior can be perplexing for developers seeking to track scrolling events effectively.

To address this issue, browsers implement two separate rendering modes: Quirks Mode and Standards Mode. Quirks Mode is designed for older websites created before web standards were widely adopted. In Quirks Mode, IE incorrectly sets document.body.scrollTop to 0.

To resolve this discrepancy, one solution is to ensure your website uses the Standards Mode doctype:

<!DOCTYPE html>

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In case your website cannot switch to Standards Mode, there's an alternative approach:

var top = (document.documentElement && document.documentElement.scrollTop) || 
              document.body.scrollTop;

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This code checks both the documentElement and body. If documentElement is defined, it takes precedence because it provides a more accurate scroll position. Otherwise, it falls back to document.body.scrollTop.

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