Skip to content

Search with higlight #20

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
langpavel wants to merge 1 commit into
base: main
Choose a base branch
from
+57 −0
Draft

Search with higlight #20

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions app/layout.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,11 @@ export default function RootLayout({
}>) {
return (
<html lang="en" suppressHydrationWarning>
<head>
{/* Highlight stylesheet cannot be loaded via CSS preprocessor (not supported yet) */}
{/* eslint-disable-next-line @next/next/no-css-tags */}
<link rel="stylesheet" href="/highlights.css" />
</head>
<body
className={`${geistSans.variable} ${geistMono.variable} antialiased`}
>
Expand Down
48 changes: 48 additions & 0 deletions lib/useHighlight.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,48 @@
"use client";
import { useEffect, useRef } from "react";

export function useHighlight(query: string, dependencies: unknown[] = []) {
const ref = useRef(null);

useEffect(() => {
if (!ref.current || !query) {
CSS.highlights.delete("search");
return;
}

const treeWalker = document.createTreeWalker(
ref.current,
NodeFilter.SHOW_TEXT,
);
const ranges: Range[] = [];

while (treeWalker.nextNode()) {
const node = treeWalker.currentNode;
const text = node.textContent?.toLowerCase() ?? "";
let startIdx = 0;

while ((startIdx = text.indexOf(query.toLowerCase(), startIdx)) !== -1) {
const range = new Range();
range.setStart(node, startIdx);
range.setEnd(node, startIdx + query.length);
ranges.push(range);
startIdx += query.length;
}
}

if (ranges.length > 0) {
console.log(`Highlighting ${ranges.length} occurrences of "${query}"`);
CSS.highlights.set("search", new Highlight(...ranges));
} else {
console.log(`No occurrences of "${query}" found`);
CSS.highlights.delete("search");
}

return () => {
CSS.highlights.delete("search");
};
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [query, ...dependencies]);

return ref;
}
4 changes: 4 additions & 0 deletions public/highlights.css
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
::highlight(search) {
background-color: #fbbf24;
color: black;
}