Simple but effective popup window blocker. Also tries to deny involuntary redirections.
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// ==UserScript==
// @name Pop-Up Blocker
// @namespace HTML
// @description Simple but effective popup window blocker. Also tries to deny involuntary redirections.
// @include *
// @version $Id$
// ==/UserScript==
(function () {
var BLOCK_MODE = {'ALL': 0, // Block all popups
'CONFIRM': 2, // Confirm each popup (not recommended, but useful for testing)
'GRANT_PERIOD': 4, // Block popups that are initiated after the mouse click grant period
'SECURE': 8} // Block popups from insecure (HTTP) sites
var block_mode = BLOCK_MODE.GRANT_PERIOD | BLOCK_MODE.SECURE;
var grant_period = 50; // Milliseconds
var ts = 0, wopen = window.open, showmodaldlg = window.showModalDialog;
var lastClickedElement;
window.addEventListener('mousedown', function (e) {
ts = Date.now();
lastClickedElement = e.currentTarget;
}, true);
window.addEventListener('click', function (e) {
ts = Date.now();
lastClickedElement = e.currentTarget;
}, true);
// Deny unsolicited redirection
var onbeforeunload = window.onbeforeunload;
window.onbeforeunload = function () {
// Check if the last clicked element was a link or button, otherwise make browser ask if the user really wants to leave the page
if (lastClickedElement &&
!{'a': 1, 'button': 1, 'input': 1}[lastClickedElement.tagName.toLowerCase()] &&
Date.now() < ts + grant_period)
return 'You are possibly involuntarily being redirected to another page. Do you want to leave ' + location.href + ' or stay?';
else if (typeof onbeforeunload === 'function')
return onbeforeunload.apply(window, arguments);
};
function confirmPopup(msg, args) {
confirm(msg + ' (' + Array.prototype.slice.apply(arguments).join(', ') + ')');
}
window.open = function () {
var oargs = arguments;
if (block_mode != BLOCK_MODE.ALL &&
(block_mode & BLOCK_MODE.CONFIRM
? confirmPopup('Allow popup?', arguments)
: (block_mode & BLOCK_MODE.SECURE ? location.protocol == 'https:' : true) && Date.now() < ts + grant_period)) {
console.info('Allowed window.open', Array.prototype.slice.apply(arguments));
return wopen.apply(window, arguments);
}
else {
console.warn('Blocked window.open', Array.prototype.slice.apply(arguments));
notify('Blocked popup window', arguments[0], arguments[1], 0, function() {
console.info('User clicked window.open', Array.prototype.slice.apply(oargs));
wopen.apply(window, oargs);
});
}
return {}
};
window.showModalDialog = function () {
if (block_mode != BLOCK_MODE.ALL &&
(block_mode & BLOCK_MODE.CONFIRM
? confirmPopup('Allow modal dialog?', arguments)
: (block_mode & BLOCK_MODE.SECURE ? location.protocol == 'https:' : true) && Date.now() < ts + grant_period)) {
console.info('Allowed window.showModalDialog', Array.prototype.slice.apply(arguments));
return showmodaldlg.apply(window, arguments);
}
else {
console.warn('Blocked modal showModalDialog', Array.prototype.slice.apply(arguments));
notify('Blocked modal dialog', arguments[0]);
}
return {}
};
function notify(text, uri, title, timeout, onclick) {
var rootElement = document.body.parentElement,
marginTop = parseFloat((rootElement.currentStyle || window.getComputedStyle(rootElement)).marginTop),
notification = document.createElement('div');
resetStyles(notification);
notification.style.cssText = 'background: InfoBackground !important';
notification.style.cssText += 'border-bottom: 1px solid WindowFrame !important';
notification.style.cssText += 'box-sizing: border-box !important';
notification.style.cssText += 'font: small-caption !important';
notification.style.cssText += 'padding: .6em .9em !important';
notification.style.cssText += 'position: fixed !important';
notification.style.cssText += 'left: 0 !important';
notification.style.cssText += 'right: 0 !important';
notification.style.cssText += 'top: -100% !important';
notification.style.cssText += 'transition: top .25s !important';
notification.style.cssText += 'width: 100% !important';
notification.style.cssText += 'white-space: nowrap !important';
notification.style.cssText += 'z-index: 2147483647 !important';
var closeButton = document.createElement('span');
resetStyles(closeButton);
closeButton.style.cssText += 'cursor: pointer !important';
closeButton.style.cssText += 'display: inline-block !important';
closeButton.style.cssText += 'float: right !important';
closeButton.style.cssText += 'font: inherit !important';
closeButton.style.cssText += 'line-height: 1.2 !important';
closeButton.style.cssText += 'margin-left: .75em !important';
closeButton.appendChild(document.createTextNode('╳'));
function closeNotification() {
rootElement.style.cssText += 'margin-top: ' + marginTop + ' !important';
notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
setTimeout(function () {
document.body.removeChild(notification);
}, 250);
}
closeButton.onclick = closeNotification;
notification.appendChild(closeButton);
notification.appendChild(document.createTextNode('? ' + text));
var linkText = document.createElement('a');
resetStyles(linkText);
linkText.style.cssText += 'color: #00e !important';
linkText.style.cssText += 'color: -moz-nativehyperlinktext !important';
linkText.style.cssText += 'font: inherit !important';
linkText.style.cssText += 'text-decoration: underline !important';
linkText.style.cssText += 'white-space: nowrap !important';
linkText.style.cssText += 'text-overflow: ellipsis !important';
linkText.style.cssText += 'max-width: 50% !important';
linkText.style.cssText += 'display: inline-block !important';
linkText.style.cssText += 'overflow: hidden !important';
linkText.style.cssText += 'vertical-align: top !important';
linkText.setAttribute('href', uri);
linkText.setAttribute('target', '_blank');
if (title) linkText.setAttribute('title', title);
linkText.appendChild(document.createTextNode(uri));
if (onclick) {
linkText.onclick = function(e) {
onclick(e);
closeNotification();
return false;
}
}
notification.appendChild(document.createTextNode(' '));
notification.appendChild(linkText);
rootElement.style.cssText += 'transition: margin-top .25s !important';
document.body.appendChild(notification);
// Note: offsetHeight is zero while the element is not part of the document DOM tree
notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
setTimeout(function() {
notification.style.cssText += 'top: 0 !important';
rootElement.style.cssText += 'margin-top: ' + (marginTop + notification.offsetHeight) + 'px !important';
}, 0)
if (timeout) {
setTimeout(function () {
closeNotification();
}, timeout);
}
}
function resetStyles(element) {
element.style.cssText = 'background: transparent !important';
element.style.cssText += 'border: none !important';
element.style.cssText += 'border-radius: 0 !important';
element.style.cssText += 'bottom: auto !important';
element.style.cssText += 'box-shadow: none !important';
element.style.cssText += 'color: WindowText !important';
element.style.cssText += 'font: medium serif !important';
element.style.cssText += 'line-height: normal !important';
element.style.cssText += 'margin: 0 !important';
element.style.cssText += 'opacity: 1 !important';
element.style.cssText += 'outline: none !important';
element.style.cssText += 'padding: 0 !important';
element.style.cssText += 'position: static !important';
element.style.cssText += 'text-align: left !important';
element.style.cssText += 'text-shadow: none !important';
element.style.cssText += 'left: auto !important';
element.style.cssText += 'right: auto !important';
element.style.cssText += 'top: auto !important';
element.style.cssText += 'white-space: normal !important';
element.style.cssText += 'width: auto !important';
}
})();