I have a JavaScript application in a tab which opens if I click on a certain link on my page. If I click on the link again, I need to check if that tab is allready opened - if it is, then switch to that tab and do something, otherwise open a new tab.
Unfortunately using
var myApp = window.open("http://www.mypage.com/myapp.html", "My App");
if(myApp){
won't help me, because I can't rely on the URL, due to the fact that the URL will differ on each environment that I'm using.
How can I achieve this if I can't rely on the URL? The only thing I can check is the tab's name - it will allways be the same. How can I access the browser's tab array, please?
Thanks!
As far as I understand, you cannot access the browser's tab array (certainly not through JavaScript). This would be a security breach on the client side. You should think of each browser tab as a browser instance of it's own - unaware of any other tab.
You can track that if tab is opened already using the Cookie/Local storage.
Save the value "isOpened=true" in either Cookie or localStorage and Be sure to delete the values from the same when that tab is Closed or when user navigates to other pages using "onunload" event.
But the page you are going to open should be on the same Domain for accessing/ setting the Cookie.
Still we cannot do anything if the user opens the page by just copying the link.
as you are opening new window using javascript you can do this you can add a dummy attribute say "data-isOpend='no'" on that element
and when user click on that element you can change that attribute to "data-isOpened='yes'"and in javascript function before opening tha new window you have to check if data-isOpend=='no' then open link in new window else do nothing
(Just leaving a differenct ans here if any other dev comes here looking for solution for such prob,Just like me :) )
We can assign name to the tab while creating it
For eg.
function view_preview()
{
var abc;
if(abc!=null){
abc.close();
}
var url=some_link
abc=window.open(url,'tab_name');
}
Here, we are opening a new tab and if that tab is already opened we are 'refreshing' it.
Related
I am using Mozilla Firefox and I am trying to figure out a way to access the content of other tabs in the same window using JavaScript and the DOM (I am open to other techniques if exist).
E.g., I want to run JavaScript code in tab1 which can find the title of some other tab. Basically I need this so that I can identify a tab which has opened due an href in my current page without using window.open method. All I want is a simple hyperlink which opens a page belonging to the same domain as the current page (the page should be opened in a new tab). Now I want to be able to access this new tab from the current tab.
Whilst you can easily open a new window using JavaScript, I'm sure that is as far as it goes. From a security point of view you wouldn't want JavaScript in one tab being able to query / access the DOM in another tab. Any site would then be able to gain access to your bank account details, etc. if both sites were opened in separate tabs.
You can access the new window/tab if it was opened with JavaScript and the page indeed is in the same domain.
You can open the window/tab like so
var win = window.open("/path_to_page");
Then you'll have to wait for the page to load before you can access e.g. the title.
win.onload = function(){ alert(win.document.title); };
You could use HTML5 cross-window messaging (archive.org link...but that's kind of cutting edge.
Even in that case, you'd probably need to hijack the <a> tag 'click' event with JavaScript and open the window yourself so that you'd have access to the new window object for posting messages.
Try setting a cookie which is accessible to any page in the same domain. On other pages, use a JavaScript timer to check if the cookie value has changed and when it has you can use its value and take an action.
It worked for me.
Well, this would not be possible, you could try
<a target="_blank" rel="opener" href="about:blank"></a>
This makes a link that opens an about:blank, this will have the same domain as the page that opened It because of the Same-Origen-policy.
I have a scenario that prevents the same website in multiple opened tab pages of browser. My idea is when user open a website at first time from browser, it's fine, when user produces the new tab page or external link to open the same website again, we should redirect it to already opened one.
I have no idea how to implement. Can I have some clues? Thanks.
I recently ran across a similar problem where I had to prevent that multiple windows/tabs operated on the same localStorage.
The solution was to use StorageEvents: every window receives a StorageEvent whenever another(!) window made changes to the same localStorage as this one uses.
Thus, the trick was to define a "dummy" key for localStorage and let every window write some random value into that key just to let all other windows using the same localStorage receive a StorageEvent:
window.addEventListener('storage', () => {
window.alert('another window or tab is working on the same localStorage')
}, false)
localStorage.setItem('Sentinel',Math.random())
Perhaps use local storage.
Window.onload=function(){
if(localStorage.getItem('windows')===1){
window.close();
}else{
localStorage.setItem("windows",1);
}
}
Window.onbeforeunload=function(){
localStorage.setItem("windows",0);
}
Hard to come up with a title, my apologizes.
Problem is this: Since modern web-browsers disable pop-up windows I am in need of a work-around.
When a visitor comes to the website they are prompt to press a button. Once the button is pressed a pop-up window is launched with the following code:
w = window.open('/audio/audioplayer.php?id='+audioId, 'audioplayer', params);
Now that the pop-up is open I would like when the visitor views other pages the pop-up is loaded with specific information based on whatever page they are on.
I am not sure if this is possible or how I can do this (check if the pop-up window is open, and if it is load the information, and if its not re-display the button)
I don't think it is possible to detect where the popup is open of not.
Have you thought about using a dialog? Rather than a popup?
window.open returns a windowObjectReference - this is the only way you can talk to the popup window. In particular, you can tell if that window is closed with the windowObjectReference.closed attribute. And the popup window has a window.opener attribute that references the parent window back. You can use both to communicate.
However, it seems you want to keep this communication between page loads. You have a few options:
Try to keep the link between windows as long as possible. The problem is that when the parent window reloads, all the javascript variables reset and there's no way to recover the reference to the popup - unless the popup sets it using window.opener. This link shows this approach and also another one with frames.You could consider it either ugly or clever. But it's not perfect. (You can't do anything if the user opens a page in a new link)
Communicate with the server using ajax from both main pages and the popup page. When a top level page wants to send a message to the popup, they start an XMLHttpRequest to your server which notifies a script which leaves a message in a "queue". The popup page regularly polls/long-polls the server with XHR too (or server sent events, my personal favorite) and updates its own contents accordingly.This might be a bit more complex/expensive than you'd like but it's also the safest solution.
Don't use popups, like the other answer suggested. A div with position: fixed could get you a similar result, and might save you from that method of communication between windows, however it also leads to having one dialog per page, so you need to ask the server if another instance of the dialog is running. Not quite sure if other methods of sync are viable for this (localstorage?)
I am using Mozilla Firefox and I am trying to figure out a way to access the content of other tabs in the same window using JavaScript and the DOM (I am open to other techniques if exist).
E.g., I want to run JavaScript code in tab1 which can find the title of some other tab. Basically I need this so that I can identify a tab which has opened due an href in my current page without using window.open method. All I want is a simple hyperlink which opens a page belonging to the same domain as the current page (the page should be opened in a new tab). Now I want to be able to access this new tab from the current tab.
Whilst you can easily open a new window using JavaScript, I'm sure that is as far as it goes. From a security point of view you wouldn't want JavaScript in one tab being able to query / access the DOM in another tab. Any site would then be able to gain access to your bank account details, etc. if both sites were opened in separate tabs.
You can access the new window/tab if it was opened with JavaScript and the page indeed is in the same domain.
You can open the window/tab like so
var win = window.open("/path_to_page");
Then you'll have to wait for the page to load before you can access e.g. the title.
win.onload = function(){ alert(win.document.title); };
You could use HTML5 cross-window messaging (archive.org link...but that's kind of cutting edge.
Even in that case, you'd probably need to hijack the <a> tag 'click' event with JavaScript and open the window yourself so that you'd have access to the new window object for posting messages.
Try setting a cookie which is accessible to any page in the same domain. On other pages, use a JavaScript timer to check if the cookie value has changed and when it has you can use its value and take an action.
It worked for me.
Well, this would not be possible, you could try
<a target="_blank" rel="opener" href="about:blank"></a>
This makes a link that opens an about:blank, this will have the same domain as the page that opened It because of the Same-Origen-policy.
Hi I would like to open a page and then run some javascript functions. My problem is that once I open the window it stops running the code:
javascript:
location=("http://www.myTestPage.com/");
showForm();
document.getElementById("txtEmail").value="test#hotmail.com";
submit();
You can't. The problem is that each page is loaded into its own logical window (even if that window occupies the same client area in the browser as the previous page). Each window runs script in its own context. Usually when windows are replaced any running script is terminated and even if it weren't I suspect you want the code following the location assignment to operate on the new content.
You would need the target page to run your code for you. If the page is generated dyanmically by something like PHP or ASP then you could use the query string to specify a file that the page should point the SRC of a script block it puts at the bottom of the body content.
It's because your javascript functions are declared in the window object. By calling location= you destroy the current window object and all the function in it. After all you cant declare function in one window to run in the same same window but with another location. All you can do is toopen a new window.
It is because the page has transferred to a new location. Execute your javascript first before you move to another location.
location=("http://www.myTestPage.com/") starts the navigation to the new page. Where do you intent for showForm() to be called from? If it's the current page, I don't get why you want to do that?
This will following though I doubt you want to open a new window, yea?
window.open("http://www.myTestPage.com/");
showForm();
document.getElementById("txtEmail").value="test#hotmail.com";
submit();
To Add:
I think you wanted to submit the form to for server-side process and also navigate to the new location at the same time. Few ways to do it:
Submit the form, and let the response redirect to the desired location
Submit the form asyncronously, after that navigate to new page
This is only possible in JavaScript if you open the second page in a new window and that page is hosted on the same domain (since JavaScript has a same-domain security policy); otherwise, you'll have to do as some others have suggested and have the target page handle it itself.