Update search functionality - dynamic url update, auto focus

src/components/Search.tsx

@@ -1,6 +1,6 @@
 // import type React from "react";
 import Fuse from "fuse.js";
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import Card from "@components/Card";
 import slugify from "@utils/slugify";
 import type { Frontmatter } from "src/types";
@@ -22,6 +22,7 @@ interface SearchResult {
 }
 
 export default function SearchBar({ searchList }: Props) {
+  const inputRef = useRef<HTMLInputElement>(null);
   const [inputVal, setInputVal] = useState("");
   const [searchResults, setSearchResults] = useState<SearchResult[] | null>(
     null
@@ -38,8 +39,33 @@ export default function SearchBar({ searchList }: Props) {
     threshold: 0.5,
   });
 
+  useEffect(() => {
+    // if URL has search query,
+    // insert that search query in input field
+    const searchUrl = new URLSearchParams(window.location.search);
+    const searchStr = searchUrl.get("q");
+    if (searchStr) setInputVal(searchStr);
+
+    // put focus cursor at the end of the string
+    setTimeout(function () {
+      inputRef.current!.selectionStart = inputRef.current!.selectionEnd =
+        searchStr?.length || 0;
+    }, 50);
+  }, []);
+
   useEffect(() => {
     setSearchResults(fuse!.search!(inputVal!));
+
+    // Update search string in URL
+    if (inputVal.length > 0) {
+      const searchParams = new URLSearchParams(window.location.search);
+      searchParams.set("q", inputVal);
+      const newRelativePathQuery =
+        window.location.pathname + "?" + searchParams.toString();
+      history.pushState(null, "", newRelativePathQuery);
+    } else {
+      history.pushState(null, "", window.location.pathname);
+    }
   }, [inputVal]);
 
   return (
@@ -62,6 +88,8 @@ export default function SearchBar({ searchList }: Props) {
           defaultValue={inputVal}
           onChange={handleChange}
           autoComplete="off"
+          autoFocus
+          ref={inputRef}
         />
       </label>