100vh problem with iOS Safari

#javascript #mobile #css #ios

Maciej Trzciński 🌱🇵🇱 Dec 13, 2020 Originally published at Medium ・Updated on Mar 27 ・2 min read

As you see, the web content will be outside the viewport although we used 100vh (the red opacity box with 100vh text).

.section {
    height: 100vh; // bad approach 
}

This problem we will receive when we just put height: 100vh for mobile devices. Mobile device calc all browser(top bar + document + bottom bar) as 100vh, and it’s little annoying when we must have 100vh page, unfortunately it doesn’t work like on desktop browser and we have to make a little more effort to receive the same result.

The 100vh problem on mobile devices is really annoying, everyone knows. I have a simple recipe to solve that problem.

To solve this problem, we need a JS and a CSS or just only the CSS (in the second solution):

1. JS & CSS solution

Let’s get started from JS file:

const appHeight = () => {
    const doc = document.documentElement
    doc.style.setProperty('--app-height', `${window.innerHeight}px`)
}
window.addEventListener('resize', appHeight)
appHeight()

appHeight function set new style property with var(--app-height) with the current window height, this property we can use in the CSS file.

:root {
   --app-height: 100%;
}

html,
body {
    padding: 0;
    margin: 0;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    height: var(--app-height);
}

var(--app-height) — it’s a reference to --app-height variable that we created previously in a JS file.

2. CSS solution (not recomended)

The second solution is --webkit-fill-available this will ignore safari and iOS native bars, and fill only the document view, but this solution doesn't protect us at Android devices.

height: 100%;
height: -webkit-fill-available;

Thank you for your attention! I’ll appreciate your feedback.

If you like this article, follow me on Twitter @MaciejDEV

Discussion (9)

Fabio Giolito • Dec 14 '20

My approach is to disable the show/hide of the safari bars by preventing the body from scrolling. That way the content area height is constant.

<body>
    <div class="app">...</div>
</body>

body {
    height: 100vh;
    height: -webkit-fill-available;
    overflow: hidden;
}
.app {
    height: 100%;
    overflow: auto;
}

Maciej Trzciński 🌱🇵🇱 • Dec 15 '20

Hi, It will work, but you have to remember about for example scrollTo and #anchors in this solution.

david • Mar 14 • Edited

nice! thanks for posting, this is the most effective solve I've found.

something thing I noticed after implementing this solution is that it can trigger the fabled 'jumpy scroll', referenced in the stack overflow post I'm sure we all landed on before finding this post. stackoverflow.com/questions/371122...

as a workaround I created two css variables, one for the fixed "starting" height, and another "dynamic" height that is only used for the shopping cart, mobile menu and other fixed-position elements that require 100% screen height.

pasted below in case someone else runs into the same issue!

// set up css var for starting app height. this will not change on resize so we can avoid the jumpy scroll issue const appHeight = () => { const doc = document.documentElement; doc.style.setProperty('--app-height', ${window.innerHeight/10}rem) }; window.addEventListener('orientationchange', appHeight); appHeight();

// set up css var for dynamic app height. this is just for the cart and mobile menu since they need to be fixed to size at all times.

const dynamicAppHeight = () => {
const doc = document.documentElement;
doc.style.setProperty('--dynamic-app-height', ${window.innerHeight/10}rem)
};
window.addEventListener('resize', dynamicAppHeight);
dynamicAppHeight();

jochenthomas • Jan 20

Hi,
see: dev.to/admitkard/mobile-issue-with...
Same issue, but again - on current Safari it is NOT working! Even on Android devices, I see the same issue.

So is there a working solution if the address bar moves away (no resize/switch to landscape etc.).