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The content of the select dropdown box is being obscured when the dialog pop-up is modified in the already released APP. #19992

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opened 2026-02-21 20:05:17 -05:00 by yindo · 3 comments
yindo commented 2026-02-21 20:05:17 -05:00
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Originally created by @Y-Muong on GitHub (Oct 29, 2025).

Self Checks

  • I have read the Contributing Guide and Language Policy.
  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report, otherwise it will be closed.
  • 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.9.1

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

  1. When creating a Dify project, set a custom field with the type of "select".
  2. Publish the Dify App.
  3. Ask something casually to make the dialog box exceed the screen length.
  4. Click on the dialog settings in the upper right corner.
  5. Select the preset custom fields, and you will see that the options are obscured.
Image

✔️ Expected Behavior

It is expected that the selectable options should be displayed above the Settings Dialog and not be obscured.

❌ Actual Behavior

Image

As shown in the figure, the select options are blocked by the Dialog.

Originally created by @Y-Muong on GitHub (Oct 29, 2025). ### Self Checks - [x] I have read the [Contributing Guide](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) and [Language Policy](https://github.com/langgenius/dify/issues/1542). - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report, otherwise it will be closed. - [x] 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：） - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.9.1 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce 1. When creating a Dify project, set a custom field with the type of "select". 2. Publish the Dify App. 3. Ask something casually to make the dialog box exceed the screen length. 4. Click on the dialog settings in the upper right corner. 5. Select the preset custom fields, and you will see that the options are obscured. <img width="1595" height="928" alt="Image" src="https://github.com/user-attachments/assets/6f7949cb-6648-4efc-8a2c-d71cc699336a" /> ### ✔️ Expected Behavior It is expected that the selectable options should be displayed above the Settings Dialog and not be obscured. ### ❌ Actual Behavior <img width="1595" height="928" alt="Image" src="https://github.com/user-attachments/assets/6f7949cb-6648-4efc-8a2c-d71cc699336a" /> As shown in the figure, the select options are blocked by the Dialog.
yindo added the 🐞 buggood first issue labels 2026-02-21 20:05:17 -05:00
yindo commented 2026-02-21 20:05:18 -05:00
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@dosubot[bot] commented on GitHub (Oct 29, 2025):

Hi @Y-Muong! I'm Dosu and I’m helping the dify team.

This issue is already tracked in the repository and is caused by how select dropdowns are rendered inside dialogs. The dropdown options are obscured because the dialog uses a high z-index and overflow-hidden, which can clip or block child elements like dropdowns rendered with lower z-index or without a portal mechanism. Dify provides a PortalSelect component that renders dropdowns in a portal with a higher z-index (z-20), designed to overlay dialogs and avoid stacking context issues. Switching your select field to use PortalSelect or increasing the z-index of the dropdown overlay can help resolve this problem. You can review the implementation details and see how portal-based rendering avoids this issue here.

To reply, just mention @dosu.

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@dosubot[bot] commented on GitHub (Oct 29, 2025): <!-- Greeting --> Hi @Y-Muong! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the dify team. <!-- Answer --> This issue is already tracked in the repository and is caused by how select dropdowns are rendered inside dialogs. The dropdown options are obscured because the dialog uses a high z-index and `overflow-hidden`, which can clip or block child elements like dropdowns rendered with lower z-index or without a portal mechanism. Dify provides a `PortalSelect` component that renders dropdowns in a portal with a higher z-index (`z-20`), designed to overlay dialogs and avoid stacking context issues. Switching your select field to use `PortalSelect` or increasing the z-index of the dropdown overlay can help resolve this problem. You can review the implementation details and see how portal-based rendering avoids this issue [here](https://github.com/langgenius/dify/blob/23b49b830431e1776458730afcbb76f880771472/web/app/components/base/select/index.tsx). <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/48b8ac5d-406a-4504-9fab-a1d22176095f?feedback_type=other)</sup>&nbsp;&nbsp;[![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/6088a4f4-073a-43f3-b3d4-4f06fb0c05a0/ask?utm_source=github)&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/langgenius/dify/issues/27581)
yindo commented 2026-02-21 20:05:18 -05:00
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@Y-Muong commented on GitHub (Oct 29, 2025):

Thank you, @dosu. I understand the cause of this bug.
My concern lies in whether the Dify team is planning to address this issue in the upcoming release version, rather than attempting to fix it on their own.

@Y-Muong commented on GitHub (Oct 29, 2025): Thank you, @dosu. I understand the cause of this bug. My concern lies in whether the Dify team is planning to address this issue in the upcoming release version, rather than attempting to fix it on their own.
yindo commented 2026-02-21 20:05:18 -05:00
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@dosubot[bot] commented on GitHub (Oct 29, 2025):

Based on all available information, there is currently no official statement, milestone, or pull request indicating that the Dify team is planning to address the select dropdown/dialog z-index issue in the upcoming release. If this changes, it would likely appear in the project's issue tracker or release notes.

To reply, just mention @dosu.

How did I do? Good | Irrelevant | Incorrect | Verbose | Hallucination | Report 🐛 | Other  Chat with Dosu Join Discord Share on X

@dosubot[bot] commented on GitHub (Oct 29, 2025): <!-- Answer --> Based on all available information, there is currently no official statement, milestone, or pull request indicating that the Dify team is planning to address the select dropdown/dialog z-index issue in the upcoming release. If this changes, it would likely appear in the project's issue tracker or release notes. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/7c58f738-dcd7-4eab-a9fe-ceb72b94b46c?feedback_type=other)</sup>&nbsp;&nbsp;[![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/6088a4f4-073a-43f3-b3d4-4f06fb0c05a0/ask?utm_source=github)&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/langgenius/dify/issues/27581)
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Reference: langgenius/dify#19992
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