angular/components

mat-dialog-content bottom edge scroll blocked on iPhone

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#15995 opened on May 10, 2019

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P4area: material/dialoghelp wanted

Description

What is the expected behavior?

Scroll at the edges(bottom edge, top edge) of dialog content not blocked..

What is the current behavior?

When I test your example Dialog with header, scrollable content and actions - on iPhone - and I scroll and reach the bottom of the scrollable content - when I by accident try to scroll once more towards the bottom - the scroll becomes unresponsive and I cant scroll up or down until I wait one second or more and try to scroll again towards the top...

What are the steps to reproduce?

https://stackblitz.com/angular/nqvvaaopbel?file=app%2Fdialog-content-example.ts Scroll till the bottom end, and when You reach the bottom and scroll bar dissapears - try to scroll again towards bottom - at that moment scroll is blocked (off course you cant scroll towards the bottom because you reached the end - BUT at that moment you ALSO CANT SCROLL TOWARDS THE TOP and seems like scroll is unresponsive until you stop touching the screen for a short time - for example 1second (or little bit less maybe)...

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

I tested it on IPhone, Safari, version 12.1...

Is there anything else we should know?

Contributor guide

Tech stack
typescripthtmlcss
Domain
frontendmobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
angular materialcss overflowtouch scrolliOS Safari
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Investigate the scroll behavior on iOS Safari for mat dialog content. Look at the StackBlitz example and check CSS properties like webkit overflow scrolling. Review comments in the issue for proposed solutions. Modify the touch scrolling CSS to prevent scroll blocking at the bottom edge.