Add reviewers selection to new pull request (#32403)

Users could add reviewers when creating new PRs.

---------

Co-authored-by: splitt3r <splitt3r@users.noreply.github.com>
Co-authored-by: Sebastian Sauer <sauer.sebastian@gmail.com>
Co-authored-by: bb-ben <70356237+bboerben@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/repo-issue-sidebar-combolist.ts

@@ -0,0 +1,89 @@
+import {fomanticQuery} from '../modules/fomantic/base.ts';
+import {POST} from '../modules/fetch.ts';
+import {queryElemChildren, toggleElem} from '../utils/dom.ts';
+
+// if there are draft comments, confirm before reloading, to avoid losing comments
+export function issueSidebarReloadConfirmDraftComment() {
+  const commentTextareas = [
+    document.querySelector<HTMLTextAreaElement>('.edit-content-zone:not(.tw-hidden) textarea'),
+    document.querySelector<HTMLTextAreaElement>('#comment-form textarea'),
+  ];
+  for (const textarea of commentTextareas) {
+    // Most users won't feel too sad if they lose a comment with 10 chars, they can re-type these in seconds.
+    // But if they have typed more (like 50) chars and the comment is lost, they will be very unhappy.
+    if (textarea && textarea.value.trim().length > 10) {
+      textarea.parentElement.scrollIntoView();
+      if (!window.confirm('Page will be reloaded, but there are draft comments. Continuing to reload will discard the comments. Continue?')) {
+        return;
+      }
+      break;
+    }
+  }
+  window.location.reload();
+}
+
+function collectCheckedValues(elDropdown: HTMLElement) {
+  return Array.from(elDropdown.querySelectorAll('.menu > .item.checked'), (el) => el.getAttribute('data-value'));
+}
+
+export function initIssueSidebarComboList(container: HTMLElement) {
+  if (!container) return;
+
+  const updateUrl = container.getAttribute('data-update-url');
+  const elDropdown = container.querySelector<HTMLElement>(':scope > .ui.dropdown');
+  const elList = container.querySelector<HTMLElement>(':scope > .ui.list');
+  const elComboValue = container.querySelector<HTMLInputElement>(':scope > .combo-value');
+  const initialValues = collectCheckedValues(elDropdown);
+
+  elDropdown.addEventListener('click', (e) => {
+    const elItem = (e.target as HTMLElement).closest('.item');
+    if (!elItem) return;
+    e.preventDefault();
+    if (elItem.getAttribute('data-can-change') !== 'true') return;
+    elItem.classList.toggle('checked');
+    elComboValue.value = collectCheckedValues(elDropdown).join(',');
+  });
+
+  const updateToBackend = async (changedValues) => {
+    let changed = false;
+    for (const value of initialValues) {
+      if (!changedValues.includes(value)) {
+        await POST(updateUrl, {data: new URLSearchParams({action: 'detach', id: value})});
+        changed = true;
+      }
+    }
+    for (const value of changedValues) {
+      if (!initialValues.includes(value)) {
+        await POST(updateUrl, {data: new URLSearchParams({action: 'attach', id: value})});
+        changed = true;
+      }
+    }
+    if (changed) issueSidebarReloadConfirmDraftComment();
+  };
+
+  const syncList = (changedValues) => {
+    const elEmptyTip = elList.querySelector('.item.empty-list');
+    queryElemChildren(elList, '.item:not(.empty-list)', (el) => el.remove());
+    for (const value of changedValues) {
+      const el = elDropdown.querySelector<HTMLElement>(`.menu > .item[data-value="${value}"]`);
+      const listItem = el.cloneNode(true) as HTMLElement;
+      listItem.querySelector('svg.octicon-check')?.remove();
+      elList.append(listItem);
+    }
+    const hasItems = Boolean(elList.querySelector('.item:not(.empty-list)'));
+    toggleElem(elEmptyTip, !hasItems);
+  };
+
+  fomanticQuery(elDropdown).dropdown({
+    action: 'nothing', // do not hide the menu if user presses Enter
+    fullTextSearch: 'exact',
+    async onHide() {
+      const changedValues = collectCheckedValues(elDropdown);
+      if (updateUrl) {
+        await updateToBackend(changedValues); // send requests to backend and reload the page
+      } else {
+        syncList(changedValues); // only update the list in the sidebar
+      }
+    },
+  });
+}