Remove fomantic checkbox module (#30162)

CSS is pretty slim already and the `.ui.toggle.checkbox` sliders on
admin page also still work. The only necessary JS is the one that links
`input` and `label` so that it can be toggled via label. All checkboxes
except the markdown ones render at `--checkbox-size: 16px` now.

<img width="174" alt="Screenshot 2024-03-28 at 22 15 10"
src="https://github.com/go-gitea/gitea/assets/115237/3455c1bb-166b-47e4-9847-2d20dd1f04db">

<img width="499" alt="Screenshot 2024-03-28 at 21 00 07"
src="https://github.com/go-gitea/gitea/assets/115237/412be2b3-d5a0-478a-b17b-43e6bc12e8ce">

<img width="83" alt="Screenshot 2024-03-28 at 22 14 34"
src="https://github.com/go-gitea/gitea/assets/115237/d8c89838-a420-4723-8c49-89405bb39474">

---------

Co-authored-by: delvh <dev.lh@web.de>

6 files changed, 50 insertions, 81 deletions

diff --git a/web_src/js/features/admin/common.js b/web_src/js/features/admin/common.js
index 8a88996742..f388b1122e 100644
--- a/web_src/js/features/admin/common.js
+++ b/web_src/js/features/admin/common.js
@@ -218,17 +218,24 @@ export function initAdminCommon() {
     });
 
     // Select actions
-    const $checkboxes = $('.select.table .ui.checkbox');
+    const checkboxes = document.querySelectorAll('.select.table .ui.checkbox input');
+
     $('.select.action').on('click', function () {
       switch ($(this).data('action')) {
         case 'select-all':
-          $checkboxes.checkbox('check');
+          for (const checkbox of checkboxes) {
+            checkbox.checked = true;
+          }
           break;
         case 'deselect-all':
-          $checkboxes.checkbox('uncheck');
+          for (const checkbox of checkboxes) {
+            checkbox.checked = false;
+          }
           break;
         case 'inverse':
-          $checkboxes.checkbox('toggle');
+          for (const checkbox of checkboxes) {
+            checkbox.checked = !checkbox.checked;
+          }
           break;
       }
     });
@@ -236,11 +243,11 @@ export function initAdminCommon() {
       e.preventDefault();
       this.classList.add('is-loading', 'disabled');
       const data = new FormData();
-      $checkboxes.each(function () {
-        if ($(this).checkbox('is checked')) {
-          data.append('ids[]', this.getAttribute('data-id'));
+      for (const checkbox of checkboxes) {
+        if (checkbox.checked) {
+          data.append('ids[]', checkbox.closest('.ui.checkbox').getAttribute('data-id'));
         }
-      });
+      }
       await POST(this.getAttribute('data-link'), {data});
       window.location.href = this.getAttribute('data-redirect');
     });
diff --git a/web_src/js/features/common-global.js b/web_src/js/features/common-global.js
index ce702f041f..009dbd9421 100644
--- a/web_src/js/features/common-global.js
+++ b/web_src/js/features/common-global.js
@@ -195,8 +195,6 @@ export function initGlobalCommon() {
   $uiDropdowns.filter('.upward').dropdown('setting', 'direction', 'upward');
   $uiDropdowns.filter('.downward').dropdown('setting', 'direction', 'downward');
 
-  $('.ui.checkbox').checkbox();
-
   $('.tabular.menu .item').tab();
 
   initSubmitEventPolyfill();
diff --git a/web_src/js/features/repo-issue.js b/web_src/js/features/repo-issue.js
index 47b4d5f71c..bb45c6ae57 100644
--- a/web_src/js/features/repo-issue.js
+++ b/web_src/js/features/repo-issue.js
@@ -282,32 +282,26 @@ export function initRepoPullRequestMergeInstruction() {
 }
 
 export function initRepoPullRequestAllowMaintainerEdit() {
-  const checkbox = document.getElementById('allow-edits-from-maintainers');
-  if (!checkbox) return;
-
-  const $checkbox = $(checkbox);
-
-  const promptError = checkbox.getAttribute('data-prompt-error');
-  $checkbox.checkbox({
-    'onChange': async () => {
-      const checked = $checkbox.checkbox('is checked');
-      let url = checkbox.getAttribute('data-url');
-      url += '/set_allow_maintainer_edit';
-      $checkbox.checkbox('set disabled');
-      try {
-        const response = await POST(url, {
-          data: {allow_maintainer_edit: checked},
-        });
-        if (!response.ok) {
-          throw new Error('Failed to update maintainer edit permission');
-        }
-      } catch (error) {
-        console.error(error);
-        showTemporaryTooltip(checkbox, promptError);
-      } finally {
-        $checkbox.checkbox('set enabled');
+  const wrapper = document.getElementById('allow-edits-from-maintainers');
+  if (!wrapper) return;
+
+  wrapper.querySelector('input[type="checkbox"]')?.addEventListener('change', async (e) => {
+    const checked = e.target.checked;
+    const url = `${wrapper.getAttribute('data-url')}/set_allow_maintainer_edit`;
+    wrapper.classList.add('is-loading');
+    e.target.disabled = true;
+    try {
+      const response = await POST(url, {data: {allow_maintainer_edit: checked}});
+      if (!response.ok) {
+        throw new Error('Failed to update maintainer edit permission');
       }
-    },
+    } catch (error) {
+      console.error(error);
+      showTemporaryTooltip(wrapper, wrapper.getAttribute('data-prompt-error'));
+    } finally {
+      wrapper.classList.remove('is-loading');
+      e.target.disabled = false;
+    }
   });
 }
 
diff --git a/web_src/js/modules/fomantic.js b/web_src/js/modules/fomantic.js
index 6aafdd5ddc..d205c2b2ee 100644
--- a/web_src/js/modules/fomantic.js
+++ b/web_src/js/modules/fomantic.js
@@ -11,8 +11,6 @@ export const fomanticMobileScreen = window.matchMedia('only screen and (max-widt
 export function initGiteaFomantic() {
   // Silence fomantic's error logging when tabs are used without a target content element
   $.fn.tab.settings.silent = true;
-  // Disable the behavior of fomantic to toggle the checkbox when you press enter on a checkbox element.
-  $.fn.checkbox.settings.enableEnterKey = false;
 
   // By default, use "exact match" for full text search
   $.fn.dropdown.settings.fullTextSearch = 'exact';
diff --git a/web_src/js/modules/fomantic/aria.md b/web_src/js/modules/fomantic/aria.md
index f639233346..5836a34506 100644
--- a/web_src/js/modules/fomantic/aria.md
+++ b/web_src/js/modules/fomantic/aria.md
@@ -41,24 +41,19 @@ The ideal checkboxes should be:
 <label><input type="checkbox"> ... </label>
 ```
 
-However, related CSS styles aren't supported (not implemented) yet, so at the moment,
-almost all the checkboxes are still using Fomantic UI checkbox.
-
-## Fomantic UI Checkbox
+However, the templates still have the Fomantic-style HTML layout:
 
 ```html
 <div class="ui checkbox">
-  <input type="checkbox"> <!-- class "hidden" will be added by $.checkbox() -->
+  <input type="checkbox">
   <label>...</label>
 </div>
 ```
 
-Then the JS `$.checkbox()` should be called to make it work with keyboard and label-clicking,
-then it works like the ideal checkboxes.
-
-There is still a problem: Fomantic UI checkbox is not friendly to screen readers,
-so we add IDs to all the Fomantic UI checkboxes automatically by JS.
-If the `label` part is empty, then the checkbox needs to get the `aria-label` attribute manually.
+We call `initAriaCheckboxPatch` to link the `input` and `label` which makes clicking the
+label etc. work. There is still a problem: These checkboxes are not friendly to screen readers,
+so we add IDs to all the Fomantic UI checkboxes automatically by JS. If the `label` part is empty,
+then the checkbox needs to get the `aria-label` attribute manually.
 
 # Fomantic Dropdown
 
diff --git a/web_src/js/modules/fomantic/checkbox.js b/web_src/js/modules/fomantic/checkbox.js
index 08af1c2eb6..ffe853b28f 100644
--- a/web_src/js/modules/fomantic/checkbox.js
+++ b/web_src/js/modules/fomantic/checkbox.js
@@ -1,38 +1,15 @@
-import $ from 'jquery';
 import {generateAriaId} from './base.js';
 
-const ariaPatchKey = '_giteaAriaPatchCheckbox';
-const fomanticCheckboxFn = $.fn.checkbox;
-
-// use our own `$.fn.checkbox` to patch Fomantic's checkbox module
 export function initAriaCheckboxPatch() {
-  if ($.fn.checkbox === ariaCheckboxFn) throw new Error('initAriaCheckboxPatch could only be called once');
-  $.fn.checkbox = ariaCheckboxFn;
-  ariaCheckboxFn.settings = fomanticCheckboxFn.settings;
-}
-
-// the patched `$.fn.checkbox` checkbox function
-// * it does the one-time attaching on the first call
-function ariaCheckboxFn(...args) {
-  const ret = fomanticCheckboxFn.apply(this, args);
-  for (const el of this) {
-    if (el[ariaPatchKey]) continue;
-    attachInit(el);
+  // link the label and the input element so it's clickable and accessible
+  for (const el of document.querySelectorAll('.ui.checkbox')) {
+    if (el.hasAttribute('data-checkbox-patched')) continue;
+    const label = el.querySelector('label');
+    const input = el.querySelector('input');
+    if (!label || !input || input.getAttribute('id') || label.getAttribute('for')) continue;
+    const id = generateAriaId();
+    input.setAttribute('id', id);
+    label.setAttribute('for', id);
+    el.setAttribute('data-checkbox-patched', 'true');
   }
-  return ret;
-}
-
-function attachInit(el) {
-  // Fomantic UI checkbox needs to be something like: <div class="ui checkbox"><label /><input /></div>
-  // It doesn't work well with <label><input />...</label>
-  // To make it work with aria, the "id"/"for" attributes are necessary, so add them automatically if missing.
-  // In the future, refactor to use native checkbox directly, then this patch could be removed.
-  el[ariaPatchKey] = {}; // record that this element has been patched
-  const label = el.querySelector('label');
-  const input = el.querySelector('input');
-  if (!label || !input || input.getAttribute('id')) return;
-
-  const id = generateAriaId();
-  input.setAttribute('id', id);
-  label.setAttribute('for', id);
 }