Office.js dialog box 'X' close button missing when using Exchange Server in an offline environment

Question

Office.js dialog box 'X' close button missing when using Exchange Server in an offline environment

Raghunandan Kumbhar 20

I have an add-in which I am running in an Exchange Server 2019 setup. The setup is completely offline, so I am hosting Office.js assets locally.

When I try to open an Office.js dialog, the 'X' close button at the top right corner of the dialog box is missing. It instead gets replaced by an empty box.

If used in an online (i.e. when the end user has internet access) with the same setup, I can see the 'X' button.

Any fixes around this will be greatly appreciated. Do let me know if any further information is required from me.

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Answer 1

Hin-V 2,075 Microsoft External Staff Moderator

Hi @Raghunandan Kumbhar

Thank you for posting your question in Microsoft Q&A.

Based on your description, I understand you have considered to configure the "X" button on Office.js dialog in Exchange sever 2019 . We are glad to assist you this part.

From my perspective, an offline setup might not being fully configured, which can cause elements like the "X" (close) button in the Office.js dialog to appear as an empty box.

If it possible, could you refer Use the Office dialog API in your Office Add-ins - Office Add-ins | Microsoft Learn to close this dialog via js:

dialog.close();

I have found relevant article that might help:

Dialog - Office UI Fabric JS

If we are misunderstanding or haven't reach out your main point, please let me know.

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Raghunandan Kumbhar 20 Reputation points

2025-07-22T15:02:31.4833333+00:00

I have not added my own 'X' button. I am talking about the 'X' button that Outlook adds by default in the top right corner of the dialog box. There is no icon there, just an empty box instead. It seems like there is an issue fetching icons in an offline setup.
Hin-V 2,075 Reputation points Microsoft External Staff Moderator

2025-07-24T12:04:58.82+00:00

Hi @Raghunandan Kumbhar

Sorry for my delayed response.

This issue might occur because in offline environment setup due to a missing 'X' close button in your Office.js dialog, which may be rendered as an empty box. The icon is typically loaded from an external Microsoft CDN, using a font or image asset. In a fully offline Exchange Server 2019 setup, the client browser cannot access these external resources, resulting in a rendering failure. When the end user has internet access, the asset loads successfully from the CDN, which explains why the dialog appears correctly in that scenario.

Based on your request to add this close 'X" button, I recommend reaching out to Tech community forum for a deeper technical dive or to connect with individuals who may have experience and expertise. There are many experienced developers and Microsoft specialists active there who can help troubleshoot and guide you through the process. As a forum moderator, I have limitations in my resources and tools but I will support you as best I can. You could try consider my workarround to close this dialog instead.

We hope this information is helpful and appreciate your understanding.

If you need further assistance, please let us know.
Hin-V 2,075 Reputation points Microsoft External Staff Moderator

2025-07-28T07:06:22.4233333+00:00

Hi @Raghunandan Kumbhar

I hope you are doing well.

Have you had a chance to check the replies provided?

Any update would be appreciated.
Hin-V 2,075 Reputation points Microsoft External Staff Moderator

2025-07-30T06:45:23.55+00:00

Hi @Raghunandan Kumbhar

I hope you are doing well. It's been a long time and I haven't received any respond from your side.

If you need any assistance or further help, please feel free to let me know.

Looking forward to hearing from you soon.

Warm thanks.
Raghunandan Kumbhar 20 Reputation points

2025-08-07T13:03:10.6433333+00:00

The issue has not been resolved yet, I will take a look at the Tech Community Forum to see if someone there can help me.

Thanks a lot for the prompt responses!

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Office.js dialog box 'X' close button missing when using Exchange Server in an offline environment

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