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Protect from closing or navigating away from a web page with changed textareas.
- // ==UserScript==// @name Protect Textarea// @namespace https://arantius.com/misc/greasemonkey/// @description Protect from closing or navigating away from a web page with changed textareas.// @include http*// @version 1.3// ==/UserScript==// Version History://// 1.3 (2011-06-06): Use pagehide/pageshow events for cache friendliness.// https://developer.mozilla.org/en-US/Firefox/Releases/1.5/Using_Firefox_1.5_caching#Page_caching_despite_unload_and_beforeunload_handlers// 1.2.1 (2010-02-16): Reduce false-positive warning rate.// 1.2 (2009-09-15): Complete rewrite, less false positives for hidden// fields controlled by scripts, better handling of// dynamic/ajax sites.// 1.1 (2006-09-18): Add the "noprotect" class detection//var CHANGED_MARK=String(Math.random()).substr(2);window.addEventListener('keypress', handleKeypress, true);window.addEventListener('submit', handl###bmit, true);window.addEventListener('beforeunload', handleUnload, true);window.addEventListener('pageshow', function() {window.addEventListener('beforeunload', handleUnload, true);}, true);function handleKeypress(event) {if (// Ignore events not in a textarea.!event.target|| !event.target.tagName|| 'TEXTAREA'!=event.target.tagName// Ignore non-character keypresses.|| 0==event.charCode// Ignore "noprotect" textareas.|| event.target.className.match(/\bnoprotect\b/)) {return;}if (0 /* debug? */) {console.log('saw keypress in', event.target);console.dir(event);}// At this point we have noticed a keypress to a textarea. Record it.var textarea = event.target;textarea.setAttribute('changed_mark', CHANGED_MARK);if (!textarea.hasAttribute('orig_value')) {textarea.setAttribute('orig_value', textarea.value);}}function handl###bmit(event) {var textareas = event.target.getElementsByTagName('textarea');for (var i=0, textarea=null; textarea=textareas[i]; i++) {textarea.removeAttribute('changed_mark');}}function handleUnload(event) {// Re-add later via pageshow. See https://developer.mozilla.org/en-US/Firefox/Releases/1.5/Using_Firefox_1.5_caching#Page_caching_despite_unload_and_beforeunload_handlerswindow.removeEventListener('beforeunload', handleUnload, true);var textareas = event.target.getElementsByTagName('textarea');textarealoop:for (var i=0, textarea=null; textarea=textareas[i]; i++) {// Check for presence in the document.var parent=textarea.parentNode;while (true) {if ('BODY'==parent.tagName) break;// Skip if we climbed the parent tree and fell out before getting to the// <body>; this textarea was removed from the document, probably by the// script that submitted it via AJAX (or some such).if (!parent || !parent.tagName) continue textarealoop;parent=parent.parentNode;}// Skip if we haven't marked this as changed.if (!textarea.hasAttribute('changed_mark')) continue;if (textarea.getAttribute('changed_mark') != CHANGED_MARK) continue;// Skip if the value is the same as the first we observed. (I.E. only// arrow or Ctrl-C keypresses.)if (textarea.value == textarea.getAttribute('orig_value')) continue;// Skip if the value is empty. (Nothing to lose!)if ('' == textarea.value) continue;// Didn't skip, so do interrupt leaving the page.return event.returnValue='You have modified a textarea, and ' +'have not submitted the form.';}}