How do i stop popup error javascript?

I have a Windows application where I use the WebBrowser control. The WebBrowser shows an html page created dynamically using javascript and xml.

This html page runs a new pop-up window. It works very well. But when I am closing the pop-up window I get the two errors:

1. It was not possible to set value of property 'CpGetValue' value of object is Null or it isn't defined;
2. It was not possible to set value of property 'CpSetValue' value of object is Null or it isn't defined.

I looked for these properties but I can't find them. I used the tips to disable JavaScript errors in the WebBrowser but I can't stop this error.

NotMe

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asked Feb 28, 2011 at 9:59

4

SLOPPY SOLUTION

If you have access to the html page and you can fix the javascript then do that. Otherwise, you might try the following.

Traverse the DOM of the webbrowser and inject the following javascript to attempt to suppress the errors:

See: How to inject Javascript in WebBrowser control?

answered Mar 2, 2011 at 1:34

Brandon BooneBrandon Boone

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I had a problem awhile ago where I was using a WebBrowser control in a C# app and there was a link that created a pop-up window: the pop-up window did not maintain the same session/cookie data, so I ended up having to post the data I needed. It sounds like something like that could be causing problems for you, but there's not enough detail to tell.

answered Apr 22, 2011 at 15:16

tobytoby

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Sorry if it's been asked. I've already found several solutions that aren't working. Not sure what I'm doing wrong.

I don't want to disable all javascript, only Javascript alert boxes. The ones that pop up and force you to click OK or X to close them.

I've found user scripts that claim to do this (example: http://userscripts.org/scripts/show/58252 ). I've put chrome on the dev channel, start chrome with the --enable-user-scripts switch, the script shows up as installed.

But I still get the alert boxes.

An example alert box that isn't getting disabled is at http://wordswithfriends.net/ - put in any garbage word into the word validator on the right sidebar. You get a popup telling you it's not a word.

Judith

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asked Jul 31, 2012 at 15:12

0

The only way to disable the alert boxes is to install either an extension or a userscript. The userscript you linked is for Firefox Greasemonkey and will not work on Chrome.

Additionally, the misbehaving page you cite is sneaky and runs that "word validator" in an iframe with code that fires the alert() immediately upon iframe reload.

But here's a userscript that defeats it:

// ==UserScript==
// @name        Wordswithfriends, Block javascript alerts
// @match       http://wordswithfriends.net/*
// @run-at      document-start
// ==/UserScript==

addJS_Node (null, null, overrideSelectNativeJS_Functions);

function overrideSelectNativeJS_Functions () {
    window.alert = function alert (message) {
        console.log (message);
    }
}

function addJS_Node (text, s_URL, funcToRun) {
    var D                                   = document;
    var scriptNode                          = D.createElement ('script');
    scriptNode.type                         = "text/javascript";
    if (text)       scriptNode.textContent  = text;
    if (s_URL)      scriptNode.src          = s_URL;
    if (funcToRun)  scriptNode.textContent  = '(' + funcToRun.toString() + ')()';

    var targ = D.getElementsByTagName ('head')[0] || D.body || D.documentElement;
    targ.appendChild (scriptNode);
}

If you really want to disable ALL alerts() on ALL pages (Not recommended), then delete the // @match line.

answered Jul 31, 2012 at 16:31

Brock AdamsBrock Adams

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5

There is at least one extension for that in the Chrome Web Store. Works for me, even though it sounds a bit suspect that it has an optional support by ads mode you can disable in its settings page. (I didn't find the setting, but figured it couldn't hurt null routing api.s13.us.)

answered Sep 22, 2016 at 7:23

ecmanautecmanaut

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If you are looking for a tool for this and don't want to mess with user scripts - there is nice tool that can handle any annoying popup on a Windows system - ClickOff. You can download it from here. I checked, it works with "Changes you made may not be saved" alert for SharePoint sites.

answered Dec 22, 2016 at 17:05

SerhiySerhiy

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2

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