Simple Text Highlighter

Cho phép người dùng tô màu (highlight) đoạn văn bản được chọn trên trang web bằng phím tắt.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(Tôi đã có Trình quản lý tập lệnh người dùng, hãy cài đặt nó!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Simple Text Highlighter
// @namespace    https://greasyfork.org/users/your-id
// @version      1.0.0
// @description  Cho phép người dùng tô màu (highlight) đoạn văn bản được chọn trên trang web bằng phím tắt.
// @author       YourName
// @match        *://*/*
// @grant        none
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    /**
     * Highlight đoạn văn bản người dùng đang chọn
     */
    function highlightSelection() {
        const selection = window.getSelection();
        if (!selection || selection.rangeCount === 0) {
            return;
        }

        const range = selection.getRangeAt(0);

        // Không highlight nếu không có text
        if (range.collapsed) {
            return;
        }

        const span = document.createElement('span');
        span.style.backgroundColor = 'yellow';
        span.style.color = 'black';

        try {
            range.surroundContents(span);
            selection.removeAllRanges();
        } catch (error) {
            console.warn('Không thể highlight nội dung này:', error);
        }
    }

    /**
     * Phím tắt: Ctrl + Shift + H
     */
    document.addEventListener('keydown', function (event) {
        if (event.ctrlKey && event.shiftKey && event.key === 'H') {
            highlightSelection();
        }
    });

})();