Readable Textarea Expander

Expands small textareas to improve readability and editing comfort on common websites.

Ten skrypt nie powinien być instalowany bezpośrednio. Jest to biblioteka dla innych skyptów do włączenia dyrektywą meta // @require https://update.greasyfork.org/scripts/570704/1780717/Readable%20Textarea%20Expander.js

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// ==UserScript==
// @name         Readable Textarea Expander
// @namespace    https://example.com/userscripts
// @version      1.0.0
// @description  Expands small textareas to improve readability and editing comfort on common websites.
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // Minimum height for textareas that are too small
    const MIN_HEIGHT = 220;

    // Apply better sizing to a textarea
    function improveTextarea(textarea) {
        if (!(textarea instanceof HTMLTextAreaElement)) {
            return;
        }

        // Avoid processing the same textarea multiple times
        if (textarea.dataset.expanderApplied === 'true') {
            return;
        }
        textarea.dataset.expanderApplied = 'true';

        const computedStyle = window.getComputedStyle(textarea);
        const currentHeight = parseFloat(computedStyle.height) || textarea.offsetHeight;

        if (currentHeight < MIN_HEIGHT) {
            textarea.style.minHeight = `${MIN_HEIGHT}px`;
        }

        textarea.style.resize = 'vertical';
        textarea.style.lineHeight = '1.5';
        textarea.style.padding = '10px';
        textarea.style.boxSizing = 'border-box';
    }

    // Process all existing textareas
    function processPage() {
        const textareas = document.querySelectorAll('textarea');
        textareas.forEach(improveTextarea);
    }

    // Watch for dynamically added textareas
    const observer = new MutationObserver(() => {
        processPage();
    });

    observer.observe(document.documentElement, {
        childList: true,
        subtree: true
    });

    // Run once on load
    processPage();
})();