angular / angular/components

bug(tabs / mat-tab-group): Open dialog with component mat-tab-group and fast change mat-tab (click another mat-tab) and empty content

Open
#25,236 8 comments 4 reactions 0 assignees View on GitHub
area: material/dialog P3
Dominant language
TypeScript
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Description

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

If I open a dialog in which I have a mat-tab-group component and quickly click on another tab (another mat-tab), the content of the newly opened tab is not rendered - it remains empty. It looks right in DOM.

There are several ways to quickly change a tab:
1. By touch
2. Click the mouse
3. By entering the click command in the console: document.evaluate('//html[1]/body[1]/div[1]/div[2]/div[1]/mat-dialog-container[1]/dialog-data-example-dialog[1]/div[1]/mat-tab-group[1]/mat-tab-header[1]/div[1]/div[1]/div[1]/div[2]', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.click()

Fast click on tab after dialog open - bug
![fast-click](https://user-images.githubusercontent.com/72687375/177704151-8b1785c2-1d36-4f89-9bf4-28810c526e37.png)

Slow click on tab after dialog open - correct
![slow-click](https://user-images.githubusercontent.com/72687375/177704221-50338a57-946c-405b-807c-2f9e9ad7bd69.png)

### Reproduction

Steps to reproduce:
1. https://stackblitz.com/edit/angular-k1g4u3-pmsayf

### Expected Behavior

Correctly loaded content of the newly selected tab

### Actual Behavior

The empty content of the newly selected tab

### Environment

- Angular: 14.0.0
- CDK/Material: 14.0.4
- Browser(s): Google Chrome 103.0.5060.66
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

Contributor guide

Open the contributing guide

Research direction

Start with the linked StackBlitz reproduction and exercise the mat-dialog-container containing mat-tab-group, including a rapid switch to another mat-tab. Trace the tab rendering behavior during dialog opening; done means the newly selected tab consistently displays its content for touch, mouse, and scripted clicks.

Written by the indexing model from the issue text.

Assessment

Tech stack
angular, typescript
Domain
frontend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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