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Recommended way to let javascript know about php server-side login/logout?

Answer 1

+2 A:

Set a cookie on login/logout actions: e.g. logged=1 :)

o_O Tync 2009-11-23 04:22:44

Answer 2

+2 A:

Have javascript poll as normal, and when it tries to poll while logged out, return an error.

cobbal 2009-11-23 04:23:28

Answer 3

+1 A:

You could just set a Javascript boolean at page load time: true if the user's logged in, and false if they're not.

Kaleb Brasee 2009-11-23 04:23:31

It's not what the author tries to do, as I can see. It is required to stop javascript polling without reloading the page if the user has been logged out (i.e., session expired or logged out in a different tab).

Igor Zinov'yev 2009-11-23 09:48:03

Answer 4

+4 A:

The Cookie approach should work. The other thing you can do is create a JSON page that returns true or false if the user is logged in. Then check that before your other code, if it's logged in do what you do, if not do something else, perhaps redirect to Login page?

In jQuery it goes something like this:

$.getJSON("/login/is_logged", function(json) {
    if(!json.User.logged) {
     window.location = '/login/form/';
    }
});

The JSON page (url /login/is_logged) returns this:

{"User":{"logged":true}}

Here's the link to $.getJSON.

Eduardo Romero 2009-11-23 07:04:12

Answer 5

A:

Ok, here is what I decided to do:

Keep a boolean that corresponds to
logged in/logged out state (1 or 0).
Login toggles 1.
Logout toggles 0.
If the existing polling checks the api and gets false return values because a logout has occurred, it will toggle the boolean to 0 as well (after either 1 or two false information checks).
Once the boolean is 0, no further polling will occur until a login event toggles it back to 1.

Tchalvak 2009-11-23 15:36:03

Answer 6

+1 A:

You can add a class="loggedin" or id="loggedin" to the <body> or <html> tags, and read these with the DOM / jQuery functions.

The class of the HTML tag can be read with: document.documentElement.className.

Since your server-side PHP already knows if the user is logged in, or not, it could add the proper "logged in" <script> code in the page too.

vdboor 2009-11-23 15:43:52

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Recommended way to let javascript know about php server-side login/logout?

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