call a java function when we press browser close button - javascript

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.

Related

How to close browser window using Asp.Net MVC and JavaScript

I want to close window tab after some success action, because customer don't want to close it manually
Script below
<script type="text/javascript">
window.close()
<script>
closes only the current View(), not the whole window.
But if it places in "_Layout.cshtml" at the first start the script is processed as expected. But after several redirects, and then when returning to "index.cshtml", an error appears
Scripts may close only the windows that were opened by them.
I know this is javascript defensive constraint, but I'm not good with js, and I don't know in which case this error appears and how to bypass or avoid it
To avoid annoyances and bad practice, browsers disallow Javascript to close browser windows unless they detect a clear action to do so (i.e. the result of a button press). If you're looking to close the window after some async work, its very likely you won't be able to do so.
You should try adding a popup window that gives the user the option to click a button which will close the tab if that is enough. You can add the following to the button to make it do so:
onClick="window.close()"
and it should work just fine. Failing that, try using an a tag like
Close
If you absolutely can not live without this feature, you'll need to create an extension for each browser you want to support that will close the window upon request. Beyond that, you'll need to find an exploit.

Java script code for pressing alt+f4 key

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();

javascript/jquery - crossbrowser detection when user is closing the browser?

i'm looking for a reliable way on how to detect when a user closes the browser/tab in order to display a warning message (i'm having a shopping cart which uses sessions).
i've googled and couldn't find a proper solution - window.onunload will display a message every time i'm refreshing the page ..
any ideas?
thanks
You can't tell the difference between closing, reloading, back/forward etc.
beforeunload is fired on all of them.
Depending on if you launched the window yourself, you could run your code before calling window.close(), but this won't be called if the user closes the window themselves.
I don't believe such a thing is possible.
The browser can fire an event when the page (un)loads, but who's to say wether the user is navigating, or closing the browser/tab?

window.unbeforeunload show div IE7 problem

Currently I am developing a web application for which I am using a pre-loader icon. What I want is that the pre-loader becomes visible every time the user navigates to another page or refreshes the page. So far I have the following solution:
window.onbeforeunload = function() { $("applicationdisabler").show(); };
For Safari and Firefox it works fine when the user clicks a link or refreshes the page. However in IE7 the div only becomes visible when the user clicks a link and NOT when the user refreshes the page.
The user can refresh the page by hitting F5 (on Windows) or any other possible way the browser provided.
Of course I have been looking for some workarounds already. The following code shows the alert in IE7, but the div still doesn't become visible.
window.onbeforeunload = function() { $("applicationdisabler").show(); alert("come on!"); };
The code of my div:
<div id="applicationdisabler"><img src="images/preloader.gif" /></div>
Hopefully someone can help me out.
You need to put the # before the id on the jQuery selector:
$("#applicationdisabler").show();
Why not use just use the onLoad listener instead? Although it would be slightly slower it should be more reliable.
Actually after a bit of looking around I'm not sure modifying the DOM makes any sense unless the onBeforeUnload handler returns false first - i.e. forces the user to stay on the same page.
As I understand it the onBeforeUnload event is fired just before the page is unloaded, so if you don't return false the browser will unload the page and DOM, and any JavaScript executed after that will be pointless.
That doesn't quite explain why JavaScript isn't executed properly in the onBeforeUnload function, but from what I've seen sites only use the window.alert or window.prompt dialogs to ask the user if they want to leave the site, and then often executing JavaScript if the user decides to stay.
Hence I'm guessing that some browsers may not allow DOM manipulation when this event is fired - since if the page is unloaded any DOM manipulation done is completely pointless.
So either:
Return false in your onBeforeUnload method, and then show your preloader (although this will stop navigation to the next page)
Use the onLoad event of the next page to show the preloader image instead
Also note: Opera versions 9.5 and below do not support this event (I'm unsure about later versions) but GMail does manage to catch the back button in Opera.
Possibly related is this security warning for IE7's implementation of the onBeforeUnload event - it's possible Microsoft patched it in a way that prevents the things you're trying to do. And I know IE6 and below don't allow commands like document.location='' in the onBeforeUnload handler for security reasons.

JavaScript + onunload event

I want to fire onunload event to do some clean up operations, I have multiple tabs(Navbar) showing multiple links to different web pages,my problem is that even when I'm in some other page my unload function which is in tag of some other jsp is fired. Please help to resove this, I want unload function to be called when user closes browser in that page.
I'm not sure how you got the onunload event to work....The problem I've found with using the onunload event is that it is fired after the page has been unloaded. This means that no more JavaScript can be executed because the page has been unloaded.
You should be looking into using the onbeforeunload event.
This event is a little unique because if the function that handles this event returns anything a pop up is displayed asking the user if they would like to continue with the operation. So, in your case make sure that your function doesn't return anything. The other thing to note about the onbeforeunload event is that, at this time, Opera does not support it (Safari, FireFox, and Internet Explorer do though).
Both the onbeforeunload and onunload events are executed every time the page is unloaded. If a control on your page submits the page to the server code, the page is unloaded and the JavaScript is executed.
If you don't want the JavaScript to be executed when a control on your page is submitting it to the server you have to implement something that checks to see whether or not your code should be executed.
This is simple, add a JavaScript boolean to the page and a function that set's this boolean to true. Make sure that every element in your page that posts back to your server code sets this boolean to true before it submits the page. Check this boolean in your onbeforeunload event to see if your cleanup code should be executed.
Hope this helps,
-Frinny
It seems that the unload function has been created in a global scope. Try placing that function only on the page you want to act.
You have a frameset page? And you want to be notified when they navigate away from the frameset? Add an onbeforeunload on the frameset. I don't know what you mean by clean up, but you can't send XHRs during unload safely across browsers

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