CODEWITHSUNDEEP
htmlioscssscrollz-index
Aides
Aides

Reputation: 3673

iOS not respecting z-index with -webkit-overflow-scrolling

Problem:

On iOS the z-index of a scrollable area is ignored when using -webkit-overflow-scrolling. If two objects with -webkit-overflow-scrolling overlap the lower one is scrolled instead of the one being displayed above.

How to reproduce:

Create two elements overlaying each other (with position: absolute for example), one of them having a higher z-index and add

.selector
{
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

to both of them. Both elements should have enough content to be scrollable.

Additionally add 

<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="apple-mobile-web-app-capable" content="yes"> 
<meta name="apple-mobile-web-app-status-bar-style" content="black">

to your <head>. Then add the page to your home screen and launch it from there.

If you then try to scroll the upper element the element beneath is scrolled instead.

MCVE:

Alternatively just check out this pen. Launch the full version from your iOS device, add it to your home screen and launch from there.

Environment:

Tested on iPhone 5 and iPhone 6 with iOS 9.1 and iOS 9.3.2

Observations:

Needed is a proper solution / workaround to fix this issue without causing any troublesome side-effects. Also explanation of why this happens would be appreciated.

Upvotes: 25

Views: 15770

Answers (4)

Mateus Milczewski
Mateus Milczewski

Reputation: 1

Remove this property dynamically when have need. It's less complicated and do not cause side effects.

Upvotes: 0

AnLT
AnLT

Reputation: 599

Assuming you face the problem like them. Please, take a look at these post:

Hope this help!

Upvotes: 2

SwankTheTank
SwankTheTank

Reputation: 1137

A really easy fix for this would be to toggle a class to the body on scrolling and target your scrollable windows. If you're scrolling .scrollA then toggle class scrollB to body and apply something like this Javascript/css or you could do it all with javascript, your choice.

Javascript

$('#targetDivA').on('scroll touch', function(){
   $('body').toggleClass('scrollB);

   //or use this to navigate to it
   //$(this).siblings().toggleClass(\'scrollB\')
})

CSS

body.scrollB .targetDivB {
    pointer-events: none;
    /*this eliminates the device from using any event until removed*/
}

Hope this helps you mate!

Upvotes: 0

Isaac Adni
Isaac Adni

Reputation: 841

Essentially, what you're experiencing is an iOS bug with -webkit-overflow-scrolling: touch;. In order to solve this bug, as per this answer, just add the following CSS styles to the scrollable div:

-webkit-transform: translateZ(0px);
-webkit-transform: translate3d(0,0,0);
-webkit-perspective: 1000;

So all in all, if you add the above styles to the styles for the scrollable class in your CSS, it should work. Tested on an iPhone 5s running iOS 9. Note that if you scroll down to the bottom or top of the scrollable section that is above everything else, it will start to scroll the body.

I believe that what those extra styles do is trick the iPhone into using the GPU, but remember that they're only necessary due to a bug with Safari - it's not your fault and these extra styles shouldn't really need to be included. But pop them into your CSS and it should work like a dream!

Upvotes: 11

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