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  1. #1
    Member
    Join Date
    Oct 2009
    Location
    Herzelia
    Posts
    2

    IE - unexpected unsubscribe

    Hello,
    I have an application that adds a few tables in a pushPage.
    The page has several tabs in it and when I want to switch to a different tab I press the tab button and it does the switch.
    for some reason, only in IE, when I change the tab my tables seems to unsubscribe (I can see the unsubscriptions happening in the lightstreamer server).
    When looking in the dynamic HTML I noticed that the iframe that takes care of the LightStreamer disappears when I change the tabs.
    The code behind the tab changing is simply setting the display style to 'none' on the tab that was left and to 'block' on the tab that was entered.
    I checked it on IE8.

    Anybody knows what might be the problem?

    After checking a little more I realized that the engine is lost for some reason.
    more than that, I saw that it doesn't matter what I do in the javascript, even if I only call javascript:void(0) for some reason the engine is lost.
    As I said before it happens only in IE.

    I would appreciate any help...

    Thank you.
    Shay

  2. #2
    Power Member
    Join Date
    Jul 2006
    Location
    Cesano Maderno, Italy
    Posts
    784
    Hi,

    please, could you tell me which client library are you using?
    I confirm that on our development version (the one used for the demo of www.lightstreamer.com) such javascript:void(0); call let the engine disappear, but for the last distributed version (the one used for the demo on http://push.lightstreamer.com ) only the connection is dropped.
    Did you observe something different?

    Btw everything is related to this known issue: http://www.lightstreamer.com/vb/showthread.php?t=79

    please let me know if that solves your problems

  3. #3
    Member
    Join Date
    Mar 2007
    Location
    Boston
    Posts
    26
    when it happens, does notifySessionClose get invoked on server meta data adapter? Thanks

  4. #4
    Administrator
    Join Date
    Jul 2006
    Location
    Milan
    Posts
    975
    Yes, notifySessionClose is invoked, though not immediately.

    When the connection is interrupted by the browser, the Server may need some time to notice that the connection is closed (it depends on the data frequency and, when low, on the probe time).
    Then, the session is kept alive for the configurable <session_timeout_millis> time, in order to keep the subscriptions active and speed up a possible replay of the session.
    Finally, notifySessionClose is invoked.

    In case of a polling session, the delay could be higher.

 

 

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