SplitterPane cannot expanded after collapsed once adding CollapsedChanged callback

[? ?]

I just added this CollapsedChanged to handle events corresponding to other components, but for some reason it caused the SplitterPane unable to expand after collapse.

This is a reproducible example:

https://blazorplayground.syncfusion.com/embed/rNBotYZwCeZgTvXs?appbar=true&editor=true&result=true&errorlist=true&theme=bootstrap5

[LeoLavanya Dhanaraj]

Hi,

 

Greetings from Syncfusion support.

Based on the information provided, we have validated and classified the reported scenarios regarding the “SplitterPane cannot expand after collapsed when adding CollapsedChanged callback" as a bug on our end. The fix for this issue will be included in the weekly patch release scheduled for September 23, 2025.

 

You can track the status of the fix through the following feedback link.

 

https://www.syncfusion.com/feedback/69979/splitterpane-cannot-expand-after-collapsed-when-adding-collapsedchanged-callback

 

Disclaimer: Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.

 

Regards,

Leo Lavanya Dhanaraj

[LeoLavanya Dhanaraj]

Hi,

 

Thanks for your patience.

 

We are glad to announce that our weekly patch release (V31.1.23) has been rolled out successfully.  The “SplitterPane cannot expand after collapsed when adding CollapsedChanged callback” has been resolved in this release.

 

To access this fix, we suggest you update the package to 31.1.23 and we included the sample in the latest version for your reference.

 

Sample : https://blazorplayground.syncfusion.com/htLoitNcxAWNMVuF

 

Feedback : https://www.syncfusion.com/feedback/69979/splitterpane-cannot-expand-after-collapsed-when-adding-collapsedchanged-callback

 

Root cause : Collapsed property does not update properly, pane classes and styles were applied based on the older value of Collapsed property and causing a race condition in splitter source and DOM not updated with current styles and classes.

 

Regards,

Leo Lavanya Dhanaraj