How To Determine If Vertical Scroll Bar Has Reached The Bottom Of The Web Page?

The same question is answered in jQUery but I'm looking for solution without jQuery. How do you know the scroll bar has reached bottom of a page I would like to know how I can dete

Solution 1:

When you tell an element to scroll, if its scrollTop (or whatever appropriate property) doesn't change, then can't you assume that it has scrolled as far as is capable?

So you can keep track of the old scrollTop, tell it to scroll some, and then check to see if it really did it:

function scroller() {
    var old = someElem.scrollTop;
    someElem.scrollTop += 200;
    if (someElem.scrollTop > old) {
        // we still have some scrolling to do...
    } else {
        // we have reached rock bottom
    }
}

Solution 2:

I just read through the jQuery source code, and it looks like you'll need the "pageYOffset". Then you can get the window height and document height.

Something like this:

var yLeftToGo = document.height - (window.pageYOffset + window.innerHeight);

If yLeftToGo is 0, then you're at the bottom. At least that's the general idea.

Solution 3:

The correct way to check if you reached the bottom of the page is this:

1. Get document.body.clientHeight = the height of the ACTUAL screen shown
2. Get document.body.offsetHeight or document.body.scrollHeight = the height of the entire page shown
3. Check if document.body.scrollTop = document.body.scrollHeight - document.body.clientHeight

If 3 is true, you reached the bottom of the page

Solution 4:

functionscrollHandler(theElement){
   if((theElement.scrollHeight - theElement.scrollTop) + "px" == theElement.style.height)
       alert("Bottom");
}

For the HTML element (like div) add the event -- onscroll='scrollHandler(this)'.

Solution 5:

Here is some code I've used to power infinite scrolling list views:

var isBelowBuffer = false;  // Flag to prevent actions from firing multiple times

$(window).scroll(function() {
    // Anytime user scrolls to the bottomif (isScrolledToBottom(30) === true) {
        if (isBelowBuffer === false) {
            // ... do something
        }
        isBelowBuffer = true;
    } else {
        isBelowBuffer = false;
    }
});

functionisScrolledToBottom(buffer) {
    var pageHeight = document.body.scrollHeight;
    // NOTE:  IE and the other browsers handle scrollTop and pageYOffset differentlyvar pagePosition = document.body.offsetHeight + Math.max(parseInt(document.body.scrollTop), parseInt(window.pageYOffset - 1));
    buffer = buffer || 0;
    console.log(pagePosition + "px / " + (pageHeight) + "px");
    return pagePosition >= (pageHeight - buffer);
}