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Virtual Scrolling stalls when scrolling via keyboard with large set of complex data #14765

s73obrien opened this Issue Jan 9, 2019 · 1 comment


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s73obrien commented Jan 9, 2019

Bug, feature request, or proposal: Bug

What is the expected behavior?

When scrolling down the list by holding down the up or down arrow key, the list should scroll smoothly all the way down to the end

What is the current behavior?

When scrolling down the list by holding down the up or down arrow key, at random times and seemingly random circumstances, the scrolling behavior stalls. I believe the focus is being lost on the list for whatever reason as, if you click on the list and press the arrow key, scrolling resumes as normal.

What are the steps to reproduce?

StackBlitz here. Click on the list and press and hold the down arrow key. It may take a couple attempts, but eventually it should stall.

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

Reproduced in Chrome 71.0.3578.98 and IE 11. Could not reproduce in Firefox 64.0.

Package Version
@angular/animations 7.2.0
@angular/cdk 7.2.1
@angular/common 7.2.0
@angular/compiler 7.2.0
@angular/core 7.2.0
@angular/forms 7.2.0
@angular/http 7.2.0
@angular/material 7.2.1
@angular/platform-browser 7.2.0
@angular/platform-browser-dynamic 7.2.0
@angular/router 7.2.0
core-js 2.6.1
rxjs 6.3.3
rxjs-compat 6.3.3
zone.js 0.8.26

Is there anything else we should know?

Resource-bound maybe?

@andrewseguin andrewseguin added the P4 label Jan 9, 2019

@mmalerba mmalerba added P3 and removed P4 labels Jan 9, 2019


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mmalerba commented Jan 9, 2019

I am able to reproduce this. It seems like maybe the element that was clicked on originally is destroyed and then the scrolling stalls. Clicking inside the viewport again will make it work again

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