Document.documentelement.scrolltop Return Value Differs In Chrome

December 27, 2023 Post a Comment

I am trying to process some code based on the 'document.documentElement.scrollTop' value. It returns '348' in FF and IE but in Chrome it returns '0'. Do i need to do anything to ov

Solution 1:

The standards-based way of getting the scroll is window.scrollY. This is supported by Chrome, Firefox, Opera, Safari and IE Edge or later. If you only support these browsers, you should go with this property.

IE >= 9 supports a similar property window.pageYOffset, which for the sake of compatibility returns the same as window.scrollY in recent browsers, though it may perhaps be deprecated at some point.

The problem with using document.documentElement.scrollTop or document.body.scrollTop is that the scroll needn't be defined on either of these. Chrome and Safari define their scroll on the <body> element whilst Firefox defines it on the <html> element returned by document.documentElement, for example. This is not standardized, and could potentially change in future versions of the browsers. However, if the scrollY or pageYOffset are not present, this is the only way to get the scroll.

TL;DR:

window.scrollY || window.pageYOffset || document.body.scrollTop + (document.documentElement && document.documentElement.scrollTop || 0)

Solution 2:

Try this

window.pageYOffset || document.documentElement.scrollTop

Solution 3:

Use window.scrollY where possible, it's designed to be consistent across browsers. If you need to support IE, then I'd recommend the following to only use window.scrollY if it's available:

typeofwindow.scrollY === "undefined" ? window.pageYOffset : window.scrollY

window.scrollY will be evaluated as false if it returns 0, so doing window.scrollY || window.pageYOffset would technically check window.pageYOffset whenever window.scrollY were 0, which obviously isn't ideal if window.pageYOffset did not also equal 0.

Also note that if you need to get the scroll value frequently (every frame/every scroll) as is often the case, you might want to check if window.scrollY is defined beforehand. I like to use this small helper function I wrote to do exactly that, along with using requestAnimationFrame - it should work in IE10 and up.

functionregisterScrollHandler (callback) {
    "use strict"var useLegacyScroll = typeofwindow.scrollY === "undefined",
        lastX = useLegacyScroll ? window.pageXOffset : window.scrollX,
        lastY = useLegacyScroll ? window.pageYOffset : window.scrollYfunctionscrollHandler () {
        // get the values using legacy scroll if we need tovar thisX = useLegacyScroll ? window.pageXOffset : window.scrollX,
            thisY = useLegacyScroll ? window.pageYOffset : window.scrollY// if either the X or Y scroll position changedif (thisX !== lastX || thisY !== lastY) {
            callback(thisX, thisY)

            // save the new position
            lastX = thisX
            lastY = thisY
        }

        // check again on the next framewindow.requestAnimationFrame(scrollHandler)
    }

    scrollHandler()
}

Use the function like this:

registerScrollHandler(function (x, y) {
    /* your code here :) */console.log("Scrolled the page", x, y)
})

Solution 4:

You can just use the following codes to fix that bug!

let scrollHeight = document.body.scrollTop || document.documentElement.scrollTop;
console.log(`scrollHeight = ${scrollHeight}`);


/*

this comment just using for testing the scroll height!

but in this iframe, it doesn't work at all!

So, you can try it out using Chrome console!

*/

document.body.scrollTop; // For Chrome, Safari and Opera document.documentElement.scrollTop; // Firefox and IE places the overflow at the level, unless else is specified. Therefore, we use the documentElement property for these two browsers

reference links:http://www.w3schools.com/jsref/prop_element_scrolltop.asp

https://drafts.csswg.org/cssom-view/#dom-element-scrolltop

https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop

Solution 5:

You can use this function document.body.getBoundingClientRect() and it returns this object {x: 0, y: 0, width: 1903, height: 2691.5625, top: 0, …}; in this object you can access body top document.body.getBoundingClientRect().top

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