Query the server for autocomplete during type

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [1.137.0] - Not released
+### Changed
+- The autocomplete is now queries server during typing. It allows to show exact
+  matches of private users and groups.
 
 ## [1.136.0] - 2024-11-08
 ### Changed

src/components/autocomplete/selector.jsx

@@ -1,7 +1,7 @@
 import { useDispatch, useSelector, useStore } from 'react-redux';
 import { Link } from 'react-router';
 import cn from 'classnames';
-import { useEffect, useMemo, useRef, useState } from 'react';
+import { useEffect, useMemo, useState } from 'react';
 import { useEvent } from 'react-use-event-hook';
 import { faExternalLinkAlt, faUserFriends } from '@fortawesome/free-solid-svg-icons';
 import { Finder } from '../../utils/sparse-match';
@@ -23,19 +23,8 @@ import {
 
 export function Selector({ query, events, onSelect, context, localLinks = false }) {
   query = query.toLowerCase();
-  const dispatch = useDispatch();
   const [usernames, accountsMap, compare] = useAccountsMap({ context });
-
-  // Request all users/groups when query longer than 2 chars
-  const lastQuery = useRef('');
-  useEffect(() => {
-    const lc = lastQuery.current;
-    if (query.length < 2 || (lc && query.slice(0, lc.length) === lc)) {
-      return;
-    }
-    lastQuery.current = query;
-    dispatch(getMatchedUsers(query));
-  }, [dispatch, query]);
+  useUsersRequest(query);
 
   const matches = useMemo(() => {
     const compareWithExact = (a, b) => {
@@ -196,3 +185,21 @@ function useAccountsMap({ context }) {
     return [[...accountsMap.keys()], accountsMap, compare];
   }, [context, post, store, lastAutocompleteQuery]);
 }
+
+function useUsersRequest(query) {
+  const dispatch = useDispatch();
+
+  useEffect(() => {
+    if (query.length < 2) {
+      return;
+    }
+
+    const abortController = new AbortController();
+    const { signal } = abortController;
+
+    const t = setTimeout(() => dispatch(getMatchedUsers(query, { signal })), 500);
+    signal.addEventListener('abort', () => clearTimeout(t));
+
+    return () => abortController.abort();
+  }, [query, dispatch]);
+}

src/redux/action-creators.js

@@ -1396,10 +1396,11 @@ export function unlockComment(id) {
   };
 }
 
-export function getMatchedUsers(query) {
+export function getMatchedUsers(query, fetchOptions) {
   return {
     type: ActionTypes.GET_MATCHED_USERS,
     apiRequest: Api.getMatchedUsers,
     payload: { query },
+    fetchOptions,
   };
 }

src/services/api.js

@@ -841,9 +841,9 @@ export function notifyOfAllComments({ postId, enabled }) {
   );
 }
 
-export function getMatchedUsers({ query }) {
-  return fetch(
-    `${apiPrefix}/users/sparseMatches?qs=${encodeURIComponent(query)}`,
-    getRequestOptions(),
-  );
+export function getMatchedUsers({ query }, fetchOptions = {}) {
+  return fetch(`${apiPrefix}/users/sparseMatches?qs=${encodeURIComponent(query)}`, {
+    ...getRequestOptions(),
+    ...fetchOptions,
+  });
 }