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How to restrict a user from updating or viewing certain fields in a form??

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    How to restrict a user from updating or viewing certain fields in a form??

    Hi,

    I was just to find out how I can restrict a user from updating or viewing couple fields in a form within a multiuse network application create by Alpha 5 ver 9, but the user manual seems to have no information about it, can anyone give me some idea for good practice on developing this? Really appreciated.

    Some how I find that if I secure the database and assign rights for different user groups, I can restrict users from viewing or read certain fields in a form, but I need to build 2 identical forms but with different field rights for restrict users and another identical forms with different field rights for full rights users, but I think there should be a better way that I can control the access right in each field for different level of user to access, please advice and correct me if I am wrong in Alpha 5 Ver 9 environment.

    Is my method a good way or if there are better and easier ways.

    Many Thanks

    #2
    Re: How to restrict a user from updating or viewing certain fields in a form??

    Have the oninit event for the form check the user permissions. If they are a full user, do nothing, if they are limited, set the properties of the fields in question to hidden, read only, etc.
    There can be only one.

    Comment


      #3
      Re: How to restrict a user from updating or viewing certain fields in a form??

      Hi Bronson,

      Another method, which I have used, is to place the fields in a Conditional object.

      Personally I find this easier to set up and control.
      Regards
      Keith Hubert
      Alpha Guild Member
      London.
      KHDB Management Systems
      Skype = keith.hubert


      For your day-to-day Needs, you Need an Alpha Database!

      Comment


        #4
        Re: How to restrict a user from updating or viewing certain fields in a form??

        Hi Stan,

        Thanks very much for your idea, since I am a newbie to Alpha Five, would you mind to give me more detailed steps on using your method, I tried to look for oninit while point at a field and click the Event button (F11) but I can't find it.

        Many Thanks

        Originally posted by Stan Mathews View Post
        Have the oninit event for the form check the user permissions. If they are a full user, do nothing, if they are limited, set
        the properties of the fields in question to hidden, read only, etc.

        Comment


          #5
          Re: How to restrict a user from updating or viewing certain fields in a form??

          Keith,

          Thanks for your method too, I am quit new to Alpha Five, expecting to build the application with point & click method instead of writing the script since I am not a programmer type of person, would you mind to tell me how I can place the fields in a Conditional object with some detailed steps.

          Many Thanks

          Originally posted by Keith Hubert View Post
          Hi Bronson,

          Another method, which I have used, is to place the fields in a Conditional object.

          Personally I find this easier to set up and control.

          Comment


            #6
            Re: How to restrict a user from updating or viewing certain fields in a form??

            Have the oninit event for the form......
            Not a field. Right click on the background of the form, or use the Form menu, in design mode.

            Events for Forms

            The following events are triggered when you display, leave, or work with a form:

            Event Name
            Occurs When

            AskSaveChange
            When the user attempts to close a form before committing changes to a changed record. Allows the programmer to customize the dialog that the user sees when aborting a record. (See AskSaveChange and AskSaveEnter Events below for more details).

            AskSaveEnter
            When the user attempts to close a form before committing changes to a new record. Allows the programmer to customize the dialog that the user sees when aborting a record. (See AskSaveChange and AskSaveEnter Events below for more details).

            CanChange
            Before a control on a form is edited. The CanChange event only fires if:

            A new record has been fetched

            You are not entering a new record.

            The restrict_change property is FALSE

            The CanChange event will not occur after changes to a record had been saved.

            CanExit
            Before the form is closed. You can prevent the form (and therefore Alpha Five as well) from being closed by including the CANCEL()command in the script attached to this event. This event is not fired when you close the form or browse with the .CLOSE() method unless you set its argument to .F. . Note the following limitation: If you have multiple forms open, each of which has a CanExit event, and you click the X on the main window frame, only the CanExit event of the first window that was opened will fire.

            CanSave
            Before the record is saved. Note that there is also a CanSaveRecord field rule event. However, if you cancel the CanSaveRecord event, the pending record is lost. If you cancel this event, the record is not saved, but the pending record is preserved, allowing the user to make necessary corrections before trying to save the record again.

            OnActivate
            The form window is activated (given focus).

            OnDeactivate
            The form window is deactivated (focus is sent to another window).

            OnEnter
            The form is put in Enter mode to enter a new record.

            OnExit
            The form is closed.

            OnFetch
            A record is retrieved from the current table or set.

            OnInit
            The form is opened.

            OnKey
            Whenever a key is pressed while the form has focus. Variables set:

            A_USER.KEY.VALUE contains the key (key is same format that is used by SYS_SEND_KEYS() i.e. A is the character A, {F1} is the F1 key.

            A_USER.KEY.EVENT is either up or down or repeat depending whether the key is being pushed, held down or released.

            A_USER.KEY.HANDLED is set to .T. if the key was handled by the OnKey event. If you set this variable to .T., then the keystroke is not passed through to Alpha Five (i.e. it is eaten by the OnKey script).

            For example, the following OnKey script will close Alpha Five when the user presses Alt-X:

            If (A_USER.KEY.VALUE = "{%X}") then

            If (A_USER.KEY.EVENT = "down") then

            :a5.close()

            End if

            End if

            TIP : To see how Alpha Five represents different key combinations, define the following OnKey script for a form, then open the trace window and try out different key combinations:

            trace.writeln("key: " + A_USER.KEY.VALUE + " event: " + A_USER.KEY.EVENT)

            See Also

            Script Recorder, Closing a Form with the ESC Key, Running a Script with a Function Key

            OnSave
            The record that is being edited is saved.

            OnTimer
            The timer interval has elapsed. The timer interval for a form is set by editing the form, selecting Form, Properties and setting a timer interval. For example, if the timer interval is set to 5 seconds, the OnTimer script will execute every five seconds.
            Fields on a form have properties. You can use them like

            Code:
            if (youruserpermission = "manager") then
                somefieldobjectname.disable()
            else
                somefieldobjectname.enable()
            end if
            There can be only one.

            Comment


              #7
              Re: How to restrict a user from updating or viewing certain fields in a form??

              Originally posted by bfcs View Post
              Keith,

              would you mind to tell me how I can place the fields in a Conditional object with some detailed steps.

              Many Thanks
              Bronson,

              This is very easy, have a good look at the Invoice form in AlphaSports. Study the payment method field and notice how the field for the credit card becomes available when one is selected from the list.
              Regards
              Keith Hubert
              Alpha Guild Member
              London.
              KHDB Management Systems
              Skype = keith.hubert


              For your day-to-day Needs, you Need an Alpha Database!

              Comment

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