DetectTextStateChange

Отслеживание элементов ввода текста на форуме и защита от случайного перехода

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.

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

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         DetectTextStateChange
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Отслеживание элементов ввода текста на форуме и защита от случайного перехода
// @author       vuchaev2015
// @match        https://zelenka.guru/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// ==/UserScript==

let element = document.querySelector('.fr-wrapper');

let lastState = null;

let observer = new MutationObserver(function(mutations) {
    mutations.forEach(function(mutation) {
        if (mutation.attributeName === "class") {
            let classList = mutation.target.classList;
            if (classList.contains('show-placeholder')) {
                if (lastState !== 'empty') {
                    lastState = 'empty';
                }
            } else {
                if (lastState !== 'filled') {
                    lastState = 'filled';
                }
            }
        }
    });
});

observer.observe(element, { attributes: true });

window.addEventListener('beforeunload', function (e) {
    if (lastState === 'filled') {
        e.preventDefault();
        e.returnValue = '';
    }
});