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Clear browser cache on startup

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  • Clear browser cache on startup

    I have a web app that logs the current gps coordinates when the user is logged in and presses the 'submit' button.

    Normally the app works as expected.

    Occasionally, a random users device will submit all records stored in their browsers cache when they submit their current gps location. Sometimes it will submit dozens of previous records along with the current record every time they press the submit button. When this happens to a user, it will continue to happen every time they submit a record until they manually go in and reset their browsers cache on their cellphone.

    Is their a way to force clear their cellphone browsers cache every time they log into the app to prevent this from happening?


  • #2
    Probably should have mentioned that these records are being written to an SQL database...


    • #3

      Have the page check to see if the user is logged in. If so, they continue otherwise go to the login page. Here is a sample from the wiki...

      dim userName as C = Context.Security.CurrentUser
      if .not. Context.Security.CallResult.Success then
      end if
      if alltrim(userName) = "" then
      'Display "no user is logged in."
      else 'Display user name
      end if

      just a thought
      Mike Reed
      Phoenix, AZ


      • #4
        You may also be able to handle this on the database side to prevent more than one record being received from the one device.


        • #5
          Originally posted by WebDesignShop View Post
          You may also be able to handle this on the database side to prevent more than one record being received from the one device.
          Curious to hear recommendations how to resolve it using this idea.



          • #6
            Well, I don't know your app parameters, but here is the idea:
            1. I assume your users each have their own computer
            2. You can capture the ip address as the device id (or something that recognized the specific device being used)
            3. Make sure you have a field in your coordinates table that stores the device id
            4. Create a unique index in your table for the device id, coordinates, date, etc. (whatever will make the index unique for that user at that time and location - warning: you can't use a date/time where seconds are included or it won't be unique due to the capture of the seconds)
            If an attempt is made to store the same overall values in the table you will get an error and it will be rejected. You have to manage the errors being returned or ignore them. We do something similar in a mobile app we have where we have to limit user input (which could occur for a variety of reasons).. Good luck!


            • #7
              Did you have lock with this?


              • #8
                I think you could take all of the incoming data and strip it down to just the first X numbers of characters before you submit it - would that help? Or is there more than 1 record being submitted creating multiple rows of data in the db?
                NWCOPRO: Nuisance Wildlife Control Software My Application: "Without forgetting, we would have no memory at what was I saying?"