Touch scrolling on appointments broken for ≥730px (regression since v32.2.7)

[Andrzej Stach]

Hi Syncfusion Team,

Environment:

· Syncfusion.Blazor.Schedule v33.1.44

· Blazor Server (.NET 10), InteractiveServer

· Touch devices / Chrome mobile emulator

· AllowDragAndDrop="true"

Problem: On touch devices with viewport ≥730px, swiping over appointments triggers drag/quick-info instead of scrolling. Below 730px, scrolling works correctly.

Regression: Up to v32.2.5, scrolling worked correctly on appointments at all viewport sizes. From v32.2.7+, behavior changed for ≥730px.

Additional note: EnableAdaptiveUI="true" does not affect this issue.

Expected behavior (any viewport width, as it worked in v32.2.5):

· Swipe → scroll

· Tap → quick-info

· Long-press + drag → drag-and-drop

Reproduction: 

@page "/cal"

@rendermode InteractiveServer


@using Syncfusion.Blazor.Schedule


<SfSchedule TValue="AppointmentData" Width="100%" Height="550px" @bind-SelectedDate="@CurrentDate" EnableAdaptiveUI="true">
    <ScheduleEventSettings DataSource="@DataSource"></ScheduleEventSettings>
</SfSchedule>


@code {
    DateTime CurrentDate = new DateTime(2025, 11, 26);
    List<AppointmentData> DataSource = new List<AppointmentData>
    {
        new AppointmentData { Id = 1, Subject = "Meeting", StartTime = new DateTime(2025, 11, 26, 9, 0, 0) , EndTime = new DateTime(2025, 11, 26, 12, 0, 0)},
    };
    public class AppointmentData
    {
        public int Id { get; set; }
        public string Subject { get; set; }
        public string Location { get; set; }
        public DateTime StartTime { get; set; }
        public DateTime EndTime { get; set; }
        public string Description { get; set; }
    }
}

1. Chrome DevTools → device toolbar → any touch device → viewport 735px

2. Touch-swipe vertically on an appointment → drag starts instead of scroll

3. Resize to 720px → same gesture → scroll works correctly

Could you please advise if this is a known issue and whether a fix is planned?

Best regards, Andrzej

[Vijayakumar Rajasekar]

Hi Andrzej Stach,

Thank you for bringing this to our attention. We apologize for the inconvenience caused and appreciate your patience.

Your reported problem is considered a bug. The fix for this defect will be included in our upcoming weekly patch release, which is expected to be rolled out by April 21, 2026. You can track the status of the fix at the following link:

Feedback link: https://www.syncfusion.com/feedback/73573/touch-scrolling-on-appointments-broken-for-730px

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,

Vijayakumar R

[Andrzej Stach]

Hi,

Could you please share the current status of this reported issue regarding touch scrolling on appointments for viewport widths ≥730px?

Thank you in advance for the update.

Regards,
Andrzej

[Vijayakumar Rajasekar]

Hi Andrzej,

Thank you for your patience while we continue to address the touch scrolling issue for appointments at viewport widths ≥730px.

We sincerely apologize for the delay in resolving this matter. Our team is currently facing some complexities with the fix, as we want to ensure it does not impact existing scenarios. This requires extensive testing to maintain the stability of the component.

To ensure a robust solution, we have revised the estimated timeline for the fix to June 2, 2026. We appreciate your understanding as we work to deliver a reliable update.

Please let us know if you have any further questions or need additional assistance in the meantime.

You can track the status of this update using the existing feedback link: 

https://www.syncfusion.com/feedback/73573/touch-scrolling-on-appointments-broken-for-730px

We appreciate your patience and will keep you informed of any changes to the release schedule.

Regards,

Vijayakumar R

[Vijayakumar Rajasekar]

Hi Andrzej Stach,

Thank you for your continued patience regarding the touch scrolling issue for appointments at viewport widths ≥730px.

We understand that this issue has taken longer than expected to resolve, and we genuinely appreciate your understanding as we've worked through the technical complexities. After thorough testing to ensure the fix maintains stability across all scenarios, we have revised the timeline once more.

The fix is now planned for our upcoming Volume 2 main release, expected in mid-June 2026. This timeline allows us to deliver a thoroughly tested and reliable solution that addresses the issue without affecting existing functionality.

You can continue to track the status using the feedback link:
https://www.syncfusion.com/feedback/73573/touch-scrolling-on-appointments-broken-for-730px 

We appreciate your patience throughout this process and remain committed to delivering a quality solution. Please let us know if you have any questions or need further assistance.

Regards,
Vijayakumar R

[Vijay Ravi]

Hi Andrzej Stach,

We are glad to announce that our weekly release (V33.2.15) has been rolled out successfully. The fix for the issue has been included in our weekly release(33.2.15) or latest version. Upgrade to the latest version to resolve the issue.

 

Release notes:  https://blazor.syncfusion.com/documentation/release-notes/33.2.15?type=all#schedule

 

Feedback link: Touch scrolling on appointments broken for ≥730px in Blazor | Feedback Portal

 

Root Cause: While scrolling over an appointment the drag and popup open action triggered. for the viewport width above 730px.

 

Regards,

Vijay

[Andrzej Stach]

Hi Syncfusion Team,

Thank you for fixing the touch scrolling issue that I reported previously.

After updating to the version containing that fix, I noticed a new issue.

Environment

• Syncfusion.Blazor.Schedule (latest version tested)

• Blazor Server (.NET 10)

• AllowDragAndDrop="true"

Problem

On a Samsung Galaxy Tab S9 FE, drag-and-drop no longer works. The drag operation never starts, so appointments cannot be moved.

The same application worked correctly on this device before the Syncfusion update.

I also tested the official Syncfusion demo, and the issue occurs there as well:

https://blazor.syncfusion.com/demos/scheduler/external-drag-and-drop/

Additional information

• Works correctly on desktop browsers.

• Works correctly in Chrome Device Emulator.

• Works correctly on Android phones and on the iPad that I tested.

• Fails on the Galaxy Tab S9 FE in both my application and the official Syncfusion demo.

Could you please check whether this is a known regression? 

[Mian G]

Hi Andrzej Stach,

Thank you for your continued patience regarding the touch scrolling issue for appointments at viewport widths ≥730px.