webui: show an error when a control panel popup fails to load

[jens-maus]

Original OpenCCU rootfs patch: 0089
Original filename: 0089-WebUI-MessagBoxFailureWarning.patch
Original patch: ``'''''https://github.com/OpenCCU/OpenCCU/blob/a7a0976657a9c6c28d84fc6ebeb2a9d230fcb08a/buildroot-external/package/openccu-base/rootfs-patches/0089-WebUI-MessagBoxFailureWarning.patch'''''''
Original changes: OpenCCU/OpenCCU@2e972f89a (as part of the former 0089-WebUI-UnavailableRoutingWarning.patch) and OpenCCU/OpenCCU@e5fe1db30 (reduced to the generic failure handling with OCCU 3.69.2)
Fixes before migration: OpenCCU/OpenCCU#4453 (status 0 handling), found in the review of this PR

When a control panel popup (CreateCPPopup() → cpMessageBox) cannot be loaded, e.g. because the server answers with an HTTP error, the popup stays empty and its overlay blocks the WebUI. This applies the patch 1:1:

• src/webui/www_source/config/js/cp_functions.js: cpMessageBox.LoadFromFile() gets an onFailure handler for its Ajax.Updater request. It hides the popup (centerbox) and its overlay (trlayer) and shows MessageBox.show(translateKey('lblError'), translateKey(errorLbl), …) if an errorLbl translation key was given, otherwise the common Ajax_failure(url, statusText) message. Prototype treats HTTP status 0 (e.g. a network error) as success and does not call onFailure, so onComplete handles status 0 the same way; both use the local helper showLoadError() (fix(webui): show an error when a control panel popup fails with status 0 OpenCCU#4453).
• CreateCPPopup(), cpMessageBox.initialize() and LoadFromFile() accept that optional third argument errorLbl and pass it on. Currently no caller passes it (the former AccessPoint caller of 2e972f89a no longer exists), so failures show the Ajax_failure() message; existing two-argument calls are unchanged.

Ajax_failure() (config/easymodes/js/ic_translate.js) and lblError already exist in webui.js and the language files. cp_functions.js keeps its ISO-8859-1 encoding and CRLF line endings. The root www/ copies are unused legacy files and are left unchanged.

Validation

• The patch applies to cp_functions.js with zero fuzz (line endings converted to CRLF); the status 0 fix of fix(webui): show an error when a control panel popup fails with status 0 OpenCCU#4453 is applied on top. node --check passes; git diff --check (with cr-at-eol) is clean.
• OpenCCU scripts/base-patch-migration.py validate with the canonical Buildroot 2026.08 git4 archive of this branch (0303c5bd, sha256 e614874c0c48e397f42bd8c302c908e82e50d30d36bd722f908bf8345c50b4fc) and --skip-patch 0089, on the OpenCCU branch of fix(webui): show an error when a control panel popup fails with status 0 OpenCCU#4453 (current pin c9553f93, equal to main): PASS (the other 49 rootfs patches apply with zero fuzz).
• compare against a validation of the current pin c9553f93 with all 50 patches, including the fixed 0089 from fix(webui): show an error when a control panel popup fails with status 0 OpenCCU#4453: IDENTICAL (4666 entries), i.e. the generated webui.js is byte-identical to the one produced by the fixed rootfs patch. The first commit alone was also IDENTICAL to the unfixed patch 0089 on master.

OpenCCU cleanup PR (removing patch 0089 and updating the pin): OpenCCU/OpenCCU#4454

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Generated by Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling when loading popup content fails. Popup layers are now hidden after a failed request, and a translated error message can be shown when available; otherwise, the existing failure notification is used.

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Generated by Claude Code

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📝 Walkthrough

Popup creation and file loading now accept an optional error label. On request failure, the popup layers are hidden, then the code shows a translated error message or calls the existing Ajax_failure handler.

Changes: Popup load failure handling

Layer / File(s)	Summary
Pass error labels and handle load failures src/webui/www_source/config/js/cp_functions.js	CreateCPPopup, cpMessageBox.initialize, and cpMessageBox.LoadFromFile accept and pass an optional errorLbl. When the request fails, the code hides the popup layers and shows a translated MessageBox error if errorLbl is defined. Otherwise, it calls Ajax_failure with the request URL and status text.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to 7dc04

The new error message for popups that fail to load does not appear when a network failure produces status 0. The popup can stay open and empty. This is a narrow edge case and the change is otherwise safe to merge.

Pre-merge checks: 5

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: displaying an error when a control panel popup fails to load.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/webui/www_source/config/js/cp_functions.js:
- Around line 256-263: Update the Ajax.Updater completion handling to check
whether trans.status is 0 and apply the same popup cleanup and error reporting
used by onFailure, so status-0 network failures do not leave the popup visible
with empty content.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between c9553f9 and 7dc04b2.

📒 Files selected for processing: 1

• src/webui/www_source/config/js/cp_functions.js

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