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Answer 1

+1 A:

Since Greasemonkey is loaded after the page and the script isn't triggered by any event, I think it's impossible to achieve what you are looking for.

metrobalderas 2010-03-03 20:52:25

Answer 2

+4 A:

Greasemonkey doesn't run until the page is loaded, so this is not possible with Greasemonkey. If you are really determined, you could set up a proxy (such as squid) with a method similar to what is used in this Upside-Down-Ternet trick.

If you can get your own JavaScript to run before the other code calls alert, then you would want to do something like this:

window.backupAlert = window.alert;
window.alert = function () {return true};

(tested working)

You can then use the backupAlert function in place of alert in your own scripts, but other scripts that assume alert still exists will not show a popup.

The reasoning for this is that alert is a function inside the window object; it is not a tag or DOM object in the document.

And no, you cannot send a keypress with JavaScript. This is globally true; you can trigger the functions that handle key press events, but you can't send OS click or keypress events.

Ricket 2010-03-03 20:55:19

Interesting solution. How about simply sending a keypress (Enter) when the Alert pops up? It can be done with AutoHotkey, but with JavaScript?

Kristoffer Bohmann 2010-03-04 05:11:07

No, unfortunately there is no keypress sending mechanism. You can detect keypresses and handle them, and you can trigger the keypress handlers that you define, but there's no way to imitate a keypress event outside of the web page (including in the alert window, in other areas of the browser, etc.)

Ricket 2010-03-04 05:42:45

Answer 3

A:

I'm not sure of doing it with javascript, since js runs on a rendered page already. My first thoughts would be to catch it before the page renders. Like with PHP. Read the contents of the external site into a string and the strip out the ALERT lines of code, then display the page.

Senica Gonzalez 2010-03-03 20:56:00

Answer 4

+1 A:

var node = document.getElementsByTagName('alert');
node.parentNode.removeChild(node);

it won't work at all, cause "alert" is not a node, but "script" is. If you managed to execute your GreaseMonkey script before alert was shown, you have to do this instead:

var node = document.getElementsByTagName('script')[0];
var str = node.firstChild.textContent;
var result = str.replace(/alert("[\w\s.]*");/, "");
node.firstChild.textContent = result;

tested in FireFox. What is going on there - you look for first script tag (can be easy done to look all of them), then you take its content (code), then you replace alert with empty string and put modifide code back. In your case result page will still heve script tag, but without any code;

hope it helps

Maxym 2010-03-03 21:17:10

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Remove Alert box before it pops up

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