JavaScript conflict modals and showIf condition

[kixe]

I have recognized a JavaScript conflict between modal windows and input fields with showIf condition. After opening and closing a modal, the showing and hiding of inputfields with showIf dependency no longer works.

@see /wire/modules/Jquery/JqueryUI/modals.js
@see /wire/modules/AdminTheme/AdminThemeUikit/scripts/main.js

[ryancramerdesign]

Thanks for the report. We haven't been able to reproduce this and no one else has reported it, so it may be specific to your installation. To help investigate, could you provide:

1. Steps to reproduce on a clean install (without third-party modules)
2. Any JS console errors that appear after opening/closing the modal
3. Your ProcessWire version and PHP version
4. Whether the issue occurs without any third-party modules or custom JS active

Without a reproducible case it's difficult to track down. -Claude

[kixe]

Steps to reproduce:

1. Create a field and use a hook to implement full HTML and Markdown support for text formatting:

$inputfield->set('textFormat', Inputfield::textFormatMarkdown);

2. Add a description including a html link to open a pw-modal:

Please choose the topic which fits best to your contribution. Click here to get an overview of all <a class="pw-modal" href="/myvdt/topics?modal=1">Formats</a>

3. Create another field with a field dependency showIf
4. Add both to the same template.
5. In the page edit ui showIf works after page load. It stops working after opening and closing the pw-modal. (see screencast)

screencast-showif-modal-bug.mp4

[matjazpotocnik]

@kixe, I also failed to replicate the issue... Your modal opens a custom endpoint: /myvdt/topics?modal=1 What is that? Maybe that's a clue? It look like this is something on the frontend? Maybe there is some script that could affect the parent page if they explicitly access parent, top, or parent.jQuery.

I also asked AI to try to reproduce:

Everything we can reproduce using only ProcessWire core works correctly:

• Current ProcessWire scripts pass.
• The exact inputfields.js and modal.js versions available when the issue was reported also pass.
• Your real page passes before and after closing the modal.
• A controlled iframe modal using the reporter’s native-select/showIf structure passes.
• modal.js does not replace the parent form or remove its handlers during close.
• The showIf handler attached in inputfields.js remains responsible for reevaluating the dependency.

[kixe]

@matjazpotocnik The page displayed within the modal is a ProcessWire admin page with a custom process. This has nothing to do with the front end in the sense of a CMS, since this ProcessWire installation does not have a frontend at all. /myvdt/ is roughly equivalent to /processwire/ in standard installations. I will try to reproduce the issue with the last PW version, since I use currently a workaround with standard uikit modals, which works perfectly.

[kixe]

Bildschirmaufnahme.2026-09-16.um.10.14.56.mp4

[matjazpotocnik]

Please set $config->debug = 'dev'; in /site/config.php and try again

[kixe]

Please set $config->debug = 'dev'; in /site/config.php and try again

Nothing changed. I use ProcessWire 3.0.272 dev © 2026

[matjazpotocnik]

@kixe I don't get any javascript errors in the console. This console warning occurs because the browser is enforcing a Permissions Policy that deprecates or explicit blocks the legacy unload event listener. Both version of jQuery uses addEventListener("unload",...). For the test, replace "unload" with "pagehide". But the root cause is Premission Policy applied somewhere: maybe .htaccess (Header set Permissions-Policy "unload=()"), maybe in html file (<meta http-equiv="Permissions-Policy" content="unload=()">), maybe there is a rule enforced by your hosting provider? Look at the Response Headers section on the Network tab. Locate the Permissions-Policy: (or Feature-Policy:) line. If it contains unload=(), the server/proxy is explicitly denying unload events. Try to replicate on new PW instalation on localhost.

[kixe]

@matjazpotocnik Thanks. Ok, I will look to solve the problem in my specific environment. Closed.

[matjazpotocnik]

Thank you, please let me know the findings.