Highlight selected text

Press 'H' to highlight selected text. Press 'H' again on highlighted text to remove it.

Verze ze dne 07. 08. 2025. Zobrazit nejnovější verzi.

Zeptejte se na otázku, přidejte recenzi nebo skript nahlašte.

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// ==UserScript==
// @name         Highlight selected text
// @namespace    https://greasyfork.org
// @version      1.0
// @description  Press 'H' to highlight selected text. Press 'H' again on highlighted text to remove it.
// @author       Bui Quoc Dung
// @match        *://*/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    GM_addStyle(`
        mark.userscript-highlight {
            background-color: #fff59d !important;
            color: black !important;
        }
    `);

    document.addEventListener('keydown', function(e) {
        if (e.key.toLowerCase() !== 'h') return;
        if (e.target.isContentEditable || ['INPUT', 'TEXTAREA'].includes(e.target.tagName)) return;

        const selection = window.getSelection();
        if (!selection.rangeCount || selection.isCollapsed) return;

        e.preventDefault();
        const range = selection.getRangeAt(0);
        const existingMark = range.commonAncestorContainer.parentElement.closest('mark.userscript-highlight');

        if (existingMark) {
            const parent = existingMark.parentNode;
            while (existingMark.firstChild) {
                parent.insertBefore(existingMark.firstChild, existingMark);
            }
            parent.removeChild(existingMark);
            parent.normalize();
        } else {
            const mark = document.createElement("mark");
            mark.className = 'userscript-highlight';

            try {
                range.surroundContents(mark);
            } catch (error) {
                console.error("Highlighting failed", error);
                alert("Unable to highlight this selection. Please try selecting a simpler text region.");
            }
        }

        selection.removeAllRanges();
    });
})();