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Deleting records from a grid

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  • Deleting records from a grid

    I have to delete records from a grid. Can the tbl.delete be used in an xbasic callback to delete records in a grid? I know there is a javascript method of doing this, but I need to disable the delete button under a condition (if the user tries to withdraw from class less than 2 days before it starts) and I know how to do this in xbasic, but not in javascript.

    Thank you,

    --Rob

  • #2
    Re: Deleting records from a grid

    It's time to cozy up to Javascript, Rob.

    Is the Delete button part of the Grid row?

    Is the Class Start Date on the Grid as well?

    Provide these answers and we'll put together a Javascript function that can be used on the Button's Enable expression. That's the best way to do this.

    Comment


    • #3
      Re: Deleting records from a grid

      David,

      Ok, thanks for the push. The delete button is part of the grid row, as is the class start date.

      I have the security groups set so I'm the only one who sees the button for now. I'd like to button to stay on the screen no matter what, but if it's less than 2 days before start date, I'd like my customers to see an alert box that says, "It's too late to withdraw from this class." (and then not run the delete code, of course)

      I appreciate your help!

      Thank you,

      --Rob
      Last edited by RobPolley; 04-17-2014, 06:44 AM. Reason: clarity

      Comment


      • #4
        Re: Deleting records from a grid

        Rob,

        Here's how you can get this done in Javascript. I really don't like working with dates in Javscript... so I use a library called moment.js. It's brilliant... makes manipulating dates so easy.

        Here's a video using a grid and checking dates for deleting records...

        http://www.youtube.com/watch?v=7n8zGOzNlWc

        And here's one about getting and setting up moment.js...

        http://www.youtube.com/watch?v=mB3lmwDCdMA

        And this is the javascript code I used in the button Click event...

        Code:
        var startDate = {grid.Object}.getValue('G','INVOICEDATE',{Grid.RowNumber});
        var startDate = moment(startDate);
        
        var cancelDate = moment(startDate).subtract('days',1);
        
        var todaysDate = moment();
        
        var allowDelete = moment(todaysDate).isAfter(cancelDate);
        
        if (allowDelete){
        	alert('Sorry, it\'s too late to cancel this class');
        	}
        	else
        	{
        	//{grid.Object}.deleteRow({Grid.RowNumber});
        	alert('Deleting row ' + {Grid.RowNumber});
        	}

        Comment


        • #5
          Re: Deleting records from a grid

          take a look at this screencast.
          if this is not you are looking for please post back.

          http://screencast.com/t/BwzMIx2Ef2w6

          Code:
          var rn = {Grid.RowNumber};
          var d1 = {grid.Object}.getValue('G','START_DATE',rn);
          var d2 = new Date(d1);
          d2 = d2.getTime();
          var d3 = new Date();
          d3 = d3.getTime();
          var diff = d2 - d3;
          if (diff > (48*60*60*1000))
          	{
          	{grid.Object}.deleteRow(rn);
          	}
          else
          	{
          	alert('You cannot withdraw now, it is too late!!');
          	}
          edit: I did what you wanted but said the opposite in recording, my apologies.

          http://screencast.com/t/wcNbWsnrxy
          customization of the alert box, if you wanted it.
          Last edited by GGandhi; 04-18-2014, 08:21 AM. Reason: customization
          thanks for reading

          gandhi

          version 11 3381 - 4096
          mysql backend
          http://www.alphawebprogramming.blogspot.com
          [email protected]
          Skype:[email protected]
          1 914 924 5171

          Comment


          • #6
            Re: Deleting records from a grid

            Thank you!

            Comment


            • #7
              Re: Deleting records from a grid

              ...so if I wanted to use xbasic to send a confirmation of deletion email, how do I do that, given that I'm doing the delete in javascript, and the possibility that we won't do the delete at all if it's too late?

              Comment


              • #8
                Re: Deleting records from a grid

                I know how to do this in xbasic, but not in javascript
                first post
                so if I wanted to use xbasic to send a confirmation of deletion email, how do I do that, given that I'm doing the delete in javascript
                last post

                so why not do them in xbasic, delete the record and send email at the same time.
                I am sure you can do it.
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                [email protected]
                Skype:[email protected]
                1 914 924 5171

                Comment


                • #9
                  Re: Deleting records from a grid

                  Gandhi,

                  I'm having a bit of trouble figuring out how to delete a record in xbasic. I think this may be a start:


                  dim tbl as P
                  tbl = table.current()
                  tbl.change_begin()
                  tbl.delete()
                  tbl.change_end(.T.)

                  I just have to figure out how to capture the primary key for the record and then delete only that record.

                  Thanks,

                  --Rob

                  Comment


                  • #10
                    Re: Deleting records from a grid

                    I do not work with dbf so I am not going to tell how to delete a record and lead you wrong way.
                    but to get the primary key
                    make the grid editable, select the select delete box to none.
                    add a button and call it withdraw or something else.
                    create a function on the onClick event and on that function put a debug(1) and run the grid.
                    and click the button select the e object you will see all the fields in that record in e._currentRowDataNew and e._currentRowDataOld
                    then you can do anything you want with it.
                    thanks for reading

                    gandhi

                    version 11 3381 - 4096
                    mysql backend
                    http://www.alphawebprogramming.blogspot.com
                    [email protected]
                    Skype:[email protected]
                    1 914 924 5171

                    Comment


                    • #11
                      Re: Deleting records from a grid

                      Add a button to the grid named "Delete" or similar. Add an onClick event, make it a callback to a function named deleteRecord. Check "compute current row data" if your grid is read-only. The deleteRecord function might look like this:

                      function deleteRecord as c (e as p)

                      if date() - 2 < convert_type(e._currentRowDataNew.class_dt,"D")
                      msg = "Sorry, cannot cancel"
                      deleteRecord = "alert('"+msg+"');"
                      END
                      end if

                      todelete = e._currentRowDataNew.id 'Just get the field that IS the primary key.

                      filter = "id="+todelete ' adjust if the primary key is a character
                      result = record_delete("[PathAlias.ADB_Path]\test.dbf",filter)
                      if result = 1
                      msg = "record deleted"
                      else
                      msg = "problem, record not found"
                      end if

                      deleteRecord = "alert('"+msg+"');{grid.Object}.refresh();"

                      end function
                      Steve Wood
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                      Comment


                      • #12
                        Re: Deleting records from a grid

                        Ghandi & Steve,

                        Many thanks for your help with this!

                        --Rob

                        Comment


                        • #13
                          Re: Deleting records from a grid

                          Steve,

                          Thanks again for your help with this. I've gotten this to work perfectly on my test db and will now put it on my working db.

                          Have a great Memorial Day weekend.

                          Thank you.

                          --Rob

                          Comment

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