iOS Safari: Prevent (or Control) Scroll on Input Focus

user_1824639 0
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There are a lot of old questions sort of (but not quite) about this, but as I couldn't find anything modern, I thought I'd ask again with the hope of receiving a modern answer.

I am working on a hobbyist responsive web app, but I'm having trouble with input focus on iOS. I would like the input to scroll to just above the iOS keyboard on focus (or not scroll), but iOS wants to center that control no matter what.

In the attached GIF, you can see the behavior I'm seeing, and then I scroll at the end to indicate what I'd like to happen as soon as the focus event is triggered.

scrolling behavior

One thing I found that sort of works, but I'd like something better: the following code works, but has a noticeable delay between the scroll you see in the GIF and the window returning to the position I'd like it. Also, if I adjust the setTimeout() timing below ~400, it doesn't work. Does iOS have some block during its focus scroll bump?

element.addEventListener('focus', (e) => { setTimeout(() => { window.scroll(0,0) }, 500) });

 

Update #1

So far, the only solution I've tried that's worked is the following, which feels pretty janky (where scrollLock is defined elsewhere in focus and blur listeners):

document.addEventListener('scroll', (e) => {
    if (scrollLock && document.documentElement.scrollTop > 100) {
        document.documentElement.scrollTop = 100;
    }
});

All the solutions involving preventDefault() or window.scroll calls have not prevented the scroll pictured above, but actively monitoring the scroll and forcing it back to where I want it does work. Would love for this not to be the answer, however!

mobile-safari css javascript ios
3 Answers

One thing that worked for us is to call a scroll event 50ms after getting focus. So if you click into the text field a focus event is triggered. In that event we trigger a setTimeout(() => window.scrollTo(0,100), 50).

user_132459600

I had a similar issue and came across this post while googling (for hours). I came back to post what worked for me in case it helps others.

Specifically I was using a bootstrap-vue modal with a text input and on focus/tap of the input field Android chrome would scroll to the bottom of the modal (looks similar to your video), if i scrolled back up and typed it stayed in focus but tapping again it would scroll again back to same spot.

Here's what worked:

html,body{
    -webkit-overflow-scrolling : touch !important;
    overflow: auto !important;
}

Original Credit to: https://stackoverflow.com/a/35675094/1625130

user_16251300

Similar issue with iOS 15, in my specific case the body was scrolling horizontally when an input element towards the right side of the page became focused. Adding position: fixed to the body and html elements fixed this for me, but I don't have any scrolling (Single Page App) so this may cause more problems for others.

user_25539790
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