javascript - Correct way to get Scroll Position - Stack Overflow

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In my application, I want to determine the current scroll position, so I have been using this to do so (source: +current+scroll+position+javascript)

window.pageYOffset || document.documentElement.scrollTop 

Problem: When I console.log this, it only returns 0 when the page is not positioned and the top.

Question: Is there an alternative way to get the current scroll position?

In my application, I want to determine the current scroll position, so I have been using this to do so (source: https://www.codegrepper./code-examples/javascript/get+current+scroll+position+javascript)

window.pageYOffset || document.documentElement.scrollTop 

Problem: When I console.log this, it only returns 0 when the page is not positioned and the top.

Question: Is there an alternative way to get the current scroll position?

• javascript
• reactjs
• window
• react-dom

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3 Answers 3

Sorted by: Reset to default 3

Try window.scrollY.

The read-only scrollY property of the Window interface returns the number of pixels that the document is currently scrolled vertically.

https://developer.mozilla/en-US/docs/Web/API/Window/scrollY

recently i had the same problem. So in order to get the position as a percentage I end up do the following

window.addEventListener("scroll", function() {

    const maxHeight = document.body.scrollHeight - window.innerHeight;
    console.log((window.pageYOffset * 100) / maxHeight);
});

We subtract window.innerHeight from document.body.scrollHeight besause window.pageYOffset represents the top of the viewport. So in order for window.pageYOffset to match document.body.scrollHeight we do the above subtraction.

PS.: The above returns a float number. you can use parseInt(...) to convert it to integer if you'd like.

const maxHeight = document.documentElement.scrollHeight - window.innerHeight;

In modern web development, it's remended to use the document.documentElement.scrollHeight property instead of document.body.scrollHeight when you want to access the total scrollable height of the document, as the former is more reliable and works consistently across browsers.

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