So I want to have a link to a site x (which I am not the developer of) that automatically performs some javascript function after it is clicked. EG.
javascript:window.location="http://www.google.com"; alert("Hello");
This performs the alert function before loading the page which is not desired.
Does anyone else know how this can be achieved?
Thanks.
If you load it in an iframe, I guess you could somehow wait for a certain element to be present and then execute your code.
You cannot do that.
Doing this, poses a security threat (XSS), and therefore disallowed by almost all the browsers!!
Worst scenarios to think of, if you had this control:
The Script to capture the username/pass of the user and mail it to you by further calling an Url.
Could play a role in unwarranted tracking/spamming.
EDIT:
This can be done only if user interaction in involved.
For eg:
You can ask user to drag a link to his bookmark toolbar, and the link should contain:
Test Click
And then to whatever page the user goes, whenever he clicks the bookmark button (link), an alert happens (or whatever script you may put.)
If the link is changing the "current" windows location, you cant execute your scripts after the external page has started loading.
You can't.
A walk around way is to put the site in to an iframe in your page. Then alert your message in its onload event. And of course your url on address bar will not change.
Related
the requeirment is that I want to avoid the specific web page to save to bookmark,
and is there someway to acheive this funcion just use some code, maybe add or js code . thanks
The answer is no, the user can always bookmark a page as this is browser function, but you can use sessions. Then make sure that any request for a page
must have an active session id or it returns an error or redirects to the home page. The user can bookmark the page but the bookmarks will then only work for a short time (until the session expires). This also has the added benefit of
making the site impossible to index by search engines.
The closest you're going to get is if you open another window using JavaScript as you can control whether the menubar and toolbar are displayed.
window.open(
"https://www.google.com/",
"Google",
"resizable,scrollbars,status");
However, this is likely going to be blocked by their popup blocker.
I want to move my email from a somewhat unreliable provider (let's say X) to Gmail.
Unfortunately email provider doesn't allow folder export or direct IMAP link.
The only thing I can do is connect Gmail to X via POP3, so that anything in X's inbox gets copied to Gmail.
This I have set up, and it works, but of course POP3 only scans inbox.
I have thousands of emails in other folders than inbox, so I need to move them to inbox first. However, I can only move messages via X's web GUI, which only allows moving one page of messages per turn.
So I have to open Saved messages folder, click on "Select all", select "inbox" and click on "Move", then the page will reload and I need to do this again... hundreds of times.
I made a Javascript function (assume MoveToInbox()) which simulates these actions, and I opened page in Firefox and started Firefox Scratchpad. So, I can keep pressing Ctrl+R in Scratchpad, then wait for page reload, then press it again, which saves about 50% of time.
However, I am wondering, if I can somehow make Scratchpad work with that tab so that it waits for page reload, then executes script then waits again, eliminating all the manual repetitive tasks.
I thought I could somehow do it with window.addEventListener, but this object seems to get cleared on page reload, so is there something I could use instead?
My own quick answer is only by using a Firefox addon such as GreaseMonkey.
The solution will, of course, vary in different cases, but my own was this GreaseMonkey Javascript:
// the function to select all messages and programmatically click on
// move button:
function moveToInbox()
{
selectAllCheckbox=document.getElementById("messagesForm")[0];
mailboxSelector=document.getElementsByName('targetMailbox')[0];
selectAllCheckbox.click(); // click on "select all" checkbox
mailboxSelector.selectedIndex=1; //specify that we are moving to inbox
inx.mail.mailbox.mailboxTransfer(); // execute provider's function for moving mail.
}
// This gets executed on any page that matches URL specified in Greasemonkey script properties
// I have put this to execute, if the URL is for the folder I want to move messages from.
messageList=document.getElementById("messagesForm")[0];
// in my case, if there are no more messages to move, the form is not created at all, so
// I can check for its existance, to determine if I need to execute moving.
if (messageList == null)
{
return;
}
else
{
moveToInbox();
}
Using an iFrame
The first problem is that variables and functions get lost after reloading:
-Use an <iframe> with src = "X"
Now the Cross domain policy is causing troubles:
-Make the <iframe> on the same website as the src
Then, you can easily access and manipulate the website with iframeId.contentDocument
An example:
Navigate to google.com, use Inspect Element to add an iframe:
<iframe src="https://www.google.ae" id="someID"> </iframe>
Then, you can use JavaScript to do anything with the iframe:
someID.contentDocument.location.reload();
setTimeout('someID.contentDocument.getElementById('lst-ib').value="iframes rock"',1000); //You should use something better than setTimeout to wait for the website to load.
I have a page that embeds an iframe from a different domain (for credit card payment). The page loaded in the iframe registers an onbeforeunload handler. That means whenever I try to navigate away from the parent page or hit reload, it asks the user for confirmation. Ok so far.
However, there are supposed to be interactions on the parent page that shall work without invoking the onbeforeunload handler being called in the iframe. Here's a simplified example:
<iframe src="https://paymentprovider.com/payment"></iframe>
Abort payment (fire onbeforeunload)
I don't have a credit card (suppress onbeforeunload)
I cannot use the iframe sandbox because Javascript is required for the iframe to work. I also tried setting the sandbox attribute of the iframe dynamically but that doesn't seem to work reliably.
The only way I was able to suppress the confirmation box is to remove the iframe in the onclick handler of the links:
iframe = document.getElementById("payment_iframe");
iframe.parentNode.removeChild(iframe)
Do you see any problem with that hack? Is this even supposed to work? Do you know of any better way to accomplish the same?
Thanks
Nope, that's a pretty good and solid solution, provided javascript is required for it to work in the first place.
(The one edge case you will miss are geeks that have turned off javascript for your page, but not the payment provider, but by the sound of it, they will only get this annoying superflous one extra question, which they were kind of asking for anyway, on some level.)
I am struggling with this, hope something can shed some light.
On click of a button, I want to open a popup window, and transfer data from parent window to a text field in the popup. And, ensure popup is fully loaded before data is filled.
I tried using document.ReadyState=="complete", but it fires before the popup is fully loaded. I also tried to check the popup.body in a setTimeOut method, but to no avail.
Can you please help ?
PS: Popup window is a form from another domain !.
You won't be able to do this unless you control both domains due to XSS restrictions, but if you do control the content on both domains it's fairly simple with a bit of JS in the page you have opened in a frame.
Using window.opener in the frame will allow you to call any functions defined in the main window, this along with the seconds pages onload event is all you need to trigger a function when it loads.
If the content of the second page is not under your control the best thing you can do is an AJAX request which you will then need to be inserted into your page, this is a little nasty but will work.
I am trying to create my own website access library (for fun) like Google Analytics where I can detect when a user accesses my website, what pages they view etc.
Is there a way to determine when the user leaves a page &/or leaves the website for good?
I have successfully coded (in python) the detecting when the user 1st accesses my site (using a cookie) & how to determine what pages they view. But I don't know how I could detect when they user leaves the website for good?
Is there a way in javascript (maybe I can detect when the page/url is changing?). I know in HTTP there is a referrer header that tells me where the user came from, maybe when the user moves to another website (outside of mine), I can be notified of this (because I will be the referrer in that HTTP request)? Am I correct?
Using jquery you can trigger this:
$(window).bind('beforeunload', function() {
// ajax call perhaps
// triggering a write to db or filesystem...
});
Pure javascript way:
<html>
<head>
<script>
function closeIt()
{
return "Any string value here forces a dialog box to \n" +
"appear before closing the window.";
}
window.onbeforeunload = closeIt;
</script>
</head>
<body>
<a href="http://www.somewhere.com">Click here to navigate to
www.somewhere.com</a>
</body>
</html>
As long the user plays by the rules you expect the onbeforeunload will work. That means, closing a tab, or closing the window, or navigating to another site.
However, you have no way to detect this reliably with javascript, onbeforeunload doens't fire in many cases, such as shutting down the browser (ctrl+q), browser crash, history (back) and opera and some versions of chrome have limited support to onbeforeunload.
If you want to detect it with high precision, you must send Ajax requests periodically that shows the user is "still alive". register those requests in a database or file and analyze it by the time sequence.
So, if you "ping" the database every 20 seconds you can know from pretty simple queries that the browser hasn't "pinged" after a short while, and determine the user is no longer in the site.
You can mark all links on your site as inner or outer links. They must point to your site, but then redirect to location, selected by user. Before redirection you can point that user left away from your site.
But.
I'd better putted on every page on your site a little script which (say every 20-30 sec) make a GET request to specific url on your site. So you can track number of each user requests.
There is an unload event you can handle in JavaScript. For example:
window.onunload = unloadPage;
function unloadPage()
{
alert("unload event detected!");
}
Unfortunately, there is no way to tell where the user is actually going when they leave the current page (unlike a referrer, when you enter the page).
One idea is, to set a variable (perhaps in database) in the unload handler (via AJAX call or what not), and then remove it if user enters another page shortly after that. Whichever record is not removed (or deactivated - soft deletes) is your last exit event before the user actually bounced off your web site or closed the browser.
You can bind to the window.beforeunload or window.unload.
Neither of these methods are very reliable though.