Get browser popup blocker status using JavaScript [duplicate] - javascript

Is there a good way to determine if a person has a popup blocker enabled? I need to maintain a web application that unfortunately has tons of popups throughout it and I need to check if the user has popup blockers enabled.
The only way I've found to do this is to open a window from javascript, check to see if it's open to determine if a blocker is enabled and then close it right away.
This is slightly annoying since users who do not have it enabled see a small flash on the screen as the window opens and closes right away.
Are there any other non-obtrusive methods for accomplishing this?

Read Detect a popup blocker using Javascript:
Basically you check if the 'window.open' method returns a handle to a newly-opened window.
Looks like this:
var mine = window.open('','','width=1,height=1,left=0,top=0,scrollbars=no');
if(mine)
var popUpsBlocked = false
else
var popUpsBlocked = true
mine.close()

As others have said, you'll have to try it and see, but checking for the resulting window object being non-"falsy" isn't sufficient for all browsers.
Opera still returns a Window object when a popup is blocked, so you have to examine the object sufficiently to determine if it's a real window:
var popup = window.open(/* ... */);
var popupBlocked = (!popup || typeof popup.document.getElementById == "undefined");

As others have commented, the only way to find out for sure is to try it.
However, a good approximate answer to the question “is a popup-blocker installed” is, these days, “yes”. All recent browsers will block your pop-ups by default, so you'd better design your app to cope gracefully with this. Namely, don't try to window.open except in reaction to a user interaction (typically onclick), and you'll be fine.

I don't think there is any way of detecting this without attempting to open a window, as popup blockers don't add anything that can be interrogated in JS.

Popups that are opened in response to an action by a user—such as clicking a link—shouldn't be blocked by popup blockers.

Related

Detect Blocked popups without opening a popup

This question has been raised many times on "How to check if the popup is blocked on my browser or not" and all the solutions that i found have proposed a solution where a new popup window is opened for testing.
References:
"Detect blocked popup in Chrome"
"How can I detect if a browser is blocking a popup?"
etc.
I would like to know if there is any possibility of knowing a blocked popup, without actually opening one.
Because due to many reasons the test pop up may take time to close, which looks ugly on start-page of your application.
For example if we could use anything from the request header from the client, to know the popup preferences etc like we can get for the language preferences.
It'll be a huge help. Thanks
As far as I know, popup blockers works by overwrite a window.open function and in most cases return a null. So one way is to detect if window.open is still nativ function.
You can test that with toString method, which return [native code] as a body of that function. toString not work in old IE, so instead of that use ''+ to convert function.
var havePopupBlockers = ('' + window.open).indexOf('[native code]') === -1;
This is not silver bullet, but can detect potential risk. I test this on Chrome, FF, IE8 and IE9 with some various popup blockers and works.

How to check the browser page is always on the top using javascript

I have write a test site, when user begin test, i will open a new window, and i don't want user can change the browser window, how could i check the user is always on my window, i can only thought to check whether the user is pressing the alt+tab or the mouser is leave the window use javascript. So, Are there any other better solution?Thanks!
I don't think there are any other solutions.
The browsers wouldn't let you do this.
But I can't see how it would work with the solutions you have:
- You can't set the position of the cursor, so you can't stop the mouse in leaving the window,
- You can't stop the system in using the Alt+tab, you can only controle the browser window.
But if you're getting it work, please write your solution in this threat, thanks

How to open a new window (or in a tab), but not give it focus

I have a function that I want to open up a URL in a new tab on a click event, but not give that tab focus. Is this possible with javascript?
You can't steal focus from a newly opened window. It's a security feature preventing sites from "taking control" of your browser. That would be a browser configuration setting.
As far as "hiding" focus from a popup, you might be thinking of what's called "PopUnder". Basically you use window.open() and set the option _blank and the paramater alwaysLowered, but it will not work gracefully for an average website. It requires you to have a signed script and take advantage of the Netscape Security PrivilegeManager, like this:
netscape.security.PrivilegeManager.enablePrivilege("UniversalPreferencesRead UniversalBrowserAccess"); // etc...
Sorry bro :)
You can attempt to open a new window, then set focus back to the current window. However, user settings may make this impossible, or it might already be the default behaviour.
Pop–unders are used by some web sites probably to disassociate the web site from the window (i.e. so you don't know where it came frome). So they are assuming a certain naivety on behalf of the user. They are considered spam and treated with the same contempt.
If you outline what it is you are trying to achieve using a pop–under, you might get advice on better ways of doing it. Or not. :-)
To my knowledge it is impossible bro.Since the user's browser Settings will conflict with your logic

How can you open 2 windows even when ie6 popup blocker is enabled

It seems like when trying to open 2 windows from a succession of windows.open calls, it only allows the first window to open and deletes the reference to the second window. I know this probably sounds a little kludgy, but we do need to have that second popup.
Any ideas?
Unfortunately we are addressing a user-case, where ie6 on the user end has popup blocker enabled.
EDIT: I just realized that you probably are using a blank ('') window name for both windows:
var win = window.open(url, '', 'blah=1');
var win2 = window.open(url2, '', 'stuff=1'); //later
This is probably handled with different windows in browsers other than IE6.
If that does not work, you might consider injecting divs that display on top of your content (instead of using popups), which is considered a better practice.
The IE pop-up blocker, by default, only allows one new window to be opened per user-initiated-action (i.e. a click on some element). If you try to open two new windows in the same handler in response to a single user-initiated-action, only the first window will successfully be opened. This is by design.
There is an override key that users can use: on IE6 I think it is CTRL, but it might be CTRL+ALT because it got changed in later versions (not sure if that was back-ported or not).
If you go to Tools->Internet Options->Pop-up Blocker->Settings->Blocking Level: and look at the value in the drop-down box for "High" it will tell you the override key in a parenthetical phrase.
In the same settings dialog, you can also add this specific site to the "Allowed sites" list, and then pop-up blocker will let all new window creation attempts on said site succeed. I'm pretty sure this list can also be pre-populated through group policy or IEAK or something like that too. But it's just a list that is stored in the registry, so you can also write log-in scripts that will just add things if they need to be added.
If you have further questions, let me know (I was the developer who implemented the IE pop-up blocker).
IE6 makes it sound like it's a corporate installation. Assuming that's true, contact your administrators and have group policy set your internal website to be in the Intranet zone, and turn off the popup blocker for that zone.

Ways to detect CTRL-N or when a user opens a new window

How can we detect when a user opens a new window. The user is already authenticated and we make heavy use of sessions.
We were trying to avoid Ctrl+N javascript hooks but maybe that is an option.
I am assuming the request is the exact same URL...with Ctrl+N?
We were trying to avoid ctrl-n javascript hooks
Forget it. Whilst you could in theory try to catch keypress events for ‘n’ with the Control key modifier, there are any number of other ways to open a new window or tab which may be more likely to be used, and you won't be able to catch. File->New Window/Tab, middle click or shift-click link, middle click back/forward buttons, right-click-open-in-new-window, open bookmark in new tab, double-click browser icon...
The user is already authenticated and we make heavy use of sessions.
That shouldn't be a problem in itself. I guess what you mean is that your application is dumping all sorts of page-specific data in the session that it shouldn't have, and now you find the application breaks when you have more than one window open on it? Well, commiserations and happy rewriting.
In the meantime about all you can do is tell the user “please don't try to open two browser windows on the same application”. There are potential ways you can make JavaScript on one page notice that JavaScript is running on another page in the same domain at the same time, generally involving using document.cookie as a inter-page communications conduit. But that's also a bit fragile.
If opening a new window causes a problem in your application, then you should fix the application code to handle it instead of trying to apply an inconsistent and unreliable client-side "bandage". That's my opinion.
Why?
And anyway you can't detect it. User can open new window not only with Ctrl+N but also with File->New Window.
You could possibly put a window count into the session and increment it on window.onload and decrement it on window.onunload.
Imagine me tutting, sucking air through my teeth and going "better you than me, guvna" if you use that, though.
What I have done to solve this issue is when the user authenticates set the window name on valid login.
<script>
window.name = 'oneWindow';
</script>
And then on the master page do a javascript check:
<script>
if (window.history.length == 0 || window.name != 'oneWindow')
//history length to see if it's a new tab or opened in a new window 0 for IE, 1 for FF
//window name to see if it's a CTRL + N new window
</script>
If the check is true then hide/remove the main content of the page and show a message stating they are doing something unsupported.
This works when your login page is not tied into the master page.
If you do not have a master page then I would suggest putting the check on all your pages.
Yes and no,
You'll always see it if a control has focus, else the event is sent directly to the browser and the code on the page never hear about it.
In my experience you can't hijack the browser's shortcut, your mileage may vary. You are likely to know it happened but the browser will do its thing (for obvious reason)
In most browsers, the effect of Ctrl-N is to open a new window at the same URL as the old one and associate it with the same sessionID.
Your best bet would be to modify the back end code if possible and allow for such things. Breaking the browser's feature is never a good thing.

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