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Say I have two html pages and open them in two tabs. I'd like to make them municate. As example when I click on a button on the first page, then it should call a function that does something on the second page.

function Test() {
    document.getElementById('test').innerHTML = "Test";
}
<!DOCTYPE html>
<html>
  <head>
    <script src="index.js"></script>
  </head>

  <body>
    <button onclick="Test()">Click here</button>
  </body>
</html>

Say I have two html pages and open them in two tabs. I'd like to make them municate. As example when I click on a button on the first page, then it should call a function that does something on the second page.

function Test() {
    document.getElementById('test').innerHTML = "Test";
}
<!DOCTYPE html>
<html>
  <head>
    <script src="index.js"></script>
  </head>

  <body>
    <button onclick="Test()">Click here</button>
  </body>
</html>

And the second page:

<!DOCTYPE html>
<html>
  <head>
    <script src="index.js"></script>
  </head>

  <body>
    <p id="test"></p>
  </body>
</html>

When I click the button on the first page it should write Test in the p tag on the second page. They can use the same JavaScript file. But how can I achieve this?

  • javascript
  • html
Share Improve this question edited Jan 1, 2020 at 18:38 asked Apr 2, 2018 at 14:09 user9585957user9585957 4
  • 1 SItes? Do you mean two different pages. Sites implies a different domain. – epascarello Commented Apr 2, 2018 at 14:24
  • Sounds like to me you need to learn some serverside language. – epascarello Commented Apr 2, 2018 at 14:24
  • Is your goal to municate between two windows in the same browser, or between two different browsers (i.e. so two different people on different puters can interact?) – Quentin Commented Apr 2, 2018 at 14:47
  • @Quentin This doesn't matters to me. The main thing is that it works :D. Have you any ideas how it could work on one of this options? – user9585957 Commented Apr 2, 2018 at 14:54
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1 Answer 1

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You can't do this with just JavaScript. The point is: JS is a client-side language which means that it is downloaded by a client (a browser) and is run by it (not by server). For the 2 pages to municate, you have establish the munication somehow, via some medium. The medium can be:

  • web itself. 2 clients can municate directly, but only if they know each others' address. How would they get those? By the help of the server (which brings us to the second option below) or by manual configuration which is very impractical (some more details may be found in context of WebRTC)
  • your server. Ok, that's the most mon approach but that involves more than just JS: this requires a server-side language (PHP, Python, C++, Java, whatever)
  • your browser. There's a special case where you can establish such a munication: if you open your second page in the same browser from your first page in a special way so that the second one is "under control" of the first one, you can "mand" the second one to do some stuff from the first one

So, if you're interested in the third option, you should read about window.open, window.opener, window.parent.

var newWindow = window.open(url, name, params);

will open a new window (say your second page) and bring you a variable newWindow which is a reference to the window object of the opened window. Try for instance

newWindow.write("haha, I'm controlling this stuff!");

Likewise, in the second window you can use

var oldWindow = window.opener;

There's also a number of methods you can use (window``.close, .moveBy, .moveTo, .resizeBy, .resizeTo etc etc).

Remember, however, that this interaction will be limited to your browser: if you change something as it is displayed in your browser (like add some text to a page) this won't affect the actual pages stored on your server because this requires your server do something via some server-side scripts.

PS to advance this technique, you may want to read about window.postMessage but that's mostly designed for munication between pages that are cross-domain.

PPS Actually, there's more!

  1. One thing to note is localStorage and sessionStorage have setItem method which generates 'storage' events on window (try localStorage.setItem('key', 'value'); and window.addEventListener('storage', event => console.log(event.key));).

  2. Another, like Anderson Green has noted, is Broadcast Channel API (try const channel = new BroadcastChannel('my_channel'), channel.postMessage('Hi there!') and channel.addEventListener('message', event => console.log(event))).

  3. There's also SharedWorkers and Service Workers.

  4. Finally, you can use some off-the-shelve solutions like tabs-router, Hermes, Visibility, Duel and SE.

Those who speak Russian may also find more useful details in this article (wow!).

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