Java script code for pressing alt+f4 key - javascript

I need a java script code for a button click that press alt+f4 key of keyboard.
So I achieve the same functionality as pressing alt+F4.
So please suggest me how I can do that.

That key event is (on most OSs I guess) processed by the OS before it's even sent to the browser, so capturing it inside a browser wont help.
What u want is to replicate the window/tab close event and AFAIK the only way in Javascript to detect that kind of stuffs are onunload & onbeforeunload events.
Unfortunately those events are also fired when you leave a site over a link or your browsers back button.
You can only detect when the page is unloaded, not when the window is closed. Also, the onbeforeunload is non-standard, so it's not supported by all browsers.

I think you are looking for
window.close();

Related

Detecting all possible cases of page refresh

I read these two questions:
How can I detect browser tab refresh or close using javascript
and
How do I detect a page refresh using jquery?
which suggest binding to 'onbeforeunload' and also binding on F5 and Ctrl-R key presses, which is good advice.
However, most browsers have a refresh button on their address bars, like this in Chrome:
Question is: is it possible to detect and bind to refresh event of browser's address bar's refresh button?
By binding onbeforeunload to windowlike this window.onbeforeunload it should trigger in most browsers. check this fiddle. It seems it's not supported on IOS devices.
For IOS apple docs suggest using pagehide see apple page on Handling Events.
The load and unload events may not work as expected for back and forward optimization. Use the pageshow and pagehide events instead.
Keep in mind that this will also trigger on all other kinds of navigation away from the page. Such as close, tab close, back/ forward navigation, link navigation and address bar navigation
Checking if the browser is reloading versus navigating away from the page I'm pretty confident is not possible, due to security/ privacy reasons not being able to give you the destination url. You could eliminate link presses by using it is an condition when firing the onbeforeunload.
Edit: If you need to check if the page has been reloaded however, you could use sessionvariables or cookies to store that the user has already opened the page once before.

Detect browser Back Button VS Reload/Refresh

window.onbeforeunload = goodbye;
I currently use the code above to detect the onbeforeunload event, but I'm wondering if there is a way to use the event object that was passed in to determine if the event was fired due to the back button being pressed or if it was from the user attempting to reload the page.
There is no life or death scenario here as Chrome (possibly others) tailors the text of the button.
I'd simply like to the tailor the message that I display...and it's bugging me that I can't find it when looking through the object in Chrome.

Javascript function is hijacking spacebar key

I'm using Firefox and I'd like to know how I can determine which function on a site that uses Javascript interrupts the normal operation of Spacebar key, which is supposed to scroll down a whole page (and in combo with Shift scoll up a page), and super-hijack it to work normally. How do I do that?
I don't want to disable Javascript on the whole site or everywhere, so Noscript is not a solution. I'm looking for disabling a single function.
In Chrome:
Open DevTools, choose Sources tab, on the right side expand Event Listener Breakpoints, here you choose Keyboard, and select keyup or keydown. Then use the website, it'll break on keyup or keydown, so you just have to press spacebar to find out where it's handled.
use Jonathan's answer to find what the issue is, but this will, as you call it, "super-hijack" it (probably):
function cancelUtil(e){
e.stopImmediatePropagation();
}
window.addEventListener('keydown',cancelUtil,true);
window.addEventListener('keypress',cancelUtil,true);
window.addEventListener('keyup',cancelUtil,true);

call a java function when we press browser close button

how we can call a java function when we press browser close button...mins when when we close the browser...
You can't tell from JavaScript when the browser window gets closed. The closest you can get is the onbeforeunload event that is supported by all major browsers and will fire when the current page gets unloaded - that can have a lot of reasons though, e.g. a simple navigating away to the next or previous page.
You can't invoke js based on a non DOM element's event, the browser buttons that is.

Can we capture an event when user presses X on the browser window?

is there a way differentiate between refresh and close in Javascript? i use window.onbeforeunload now which works great in IE. To void this being called anywhere but close, i set a flag on EVERY button ...this seems like a difficult, hacky solution, but after searching for hours on google, it was the best i could find.
Isn't there an onclose event for IE????? or onclick?
I only need to support IE, not FF, so please don't post anything FF related, I can't use it.
Thanks!
As far as I know there is no way to trap in JavaScript the click of the X (close) button in any browser. In my opinion this is due to security concern... JavaScript can't (an will never be able to) listen to OS messages like the close of the current window.
The only solution I know (which is what you seem to use) is:
<body onunload="alert('Fired');">
But as you find out if fires on close and on reload. Again this is normal behavior because, AFAIK, for the JS engine a reload is the same as a close then a reopen of the same page.
AFAIK, no there is no IE specific onclose event.

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