Question

Gridcontrol woes

Asked by: leemarc

I have a grid control that holds a cursor.  When I change data in a cell [say from a 0 to  5 and leave the cell with and arrow key the data is not saved to the cell at least not really since it is there on screen. If I leave the cell with and enter key the data is present.
The problem is the dat ais not available in teh afterrowcolumnchange event until I leave the cell and go back to it with a sort of downarrow then uparrow. There is a docase endcase in the code in the afterrowcolumnchange that test a cell value. I used the wait window inthe code to prove to me that the value is not there
The results of the wait window before the DO CASE are qtyord = 0 and qtyrec = 0 but I entered a 5 in the qtyord cell.  How can I force the entry to be stored to the field in the cursor. I DO NOT want to reloard the cursor since this cursor is used to change live data once the rows have been chenged and validated. I use an OK button to actually the update of the live data

LPARAMETERS nColIndex
* validate that the qtyord does not exceed the qtyreq
*WAIT WINDOW "before case statment qtyord "+STR(crsorderitems.qtyord) +" - qtyrec" + STR(crsorderitems.qtyreq)+
DO CASE
CASE crsorderitems.qtyord > crsorderitems.qtyreq
	* we need to reset the previous value
*	WAIT WINDOW "case 1 qtyord "+STR(crsorderitems.qtyord) +" - qtyrec" + STR(crsorderitems.qtyreq) NOWAIT
	MESSAGEBOX("Qty Ordered CANNOT Exceed Qty Requested - Reverting to Zero Qty Ordered",16,"Error Message",30000)
	REPLACE qtyord WITH THISFORM.prevqtyord IN crsorderitems
CASE crsorderitems.qtyord < 0
*	WAIT WINDOW "case 2 qtyord "+STR(crsorderitems.qtyord) +" - qtyrec" + STR(crsorderitems.qtyreq) NOWAIT
	MESSAGEBOX("Quantity Ordered CANNOT be less than 0 - Reverting to Zero Qty Ordered",16,"Error Message",30000)
	REPLACE qtyord WITH THISFORM.prevqtyord IN crsorderitems
OTHERWISE
ENDCASE

                                  
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Asked On
2009-05-22 at 12:32:06ID24432194
Tags

arrow keys

Topic

FoxPro Database

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Answers

 

by: leemarcPosted on 2009-05-22 at 12:35:43ID: 24454428

I should also mention - I have tried both the up and down arrows wit the sames effect

 

by: pcelbaPosted on 2009-05-22 at 13:39:33ID: 24454920

AfterRowColChange Event fired by Up or Down arrow key occurs AFTER the row is changed in the cursor so you are testing/displaying data from the new row. Incorrect data are stored in the cursor and they are validated and changed when you return back to the cell. The Enter key fires the AfterRowColChange also but the record is not changed so incorrect data are replaced immediately.

To validate data in a cell you have to place your code e.g. into the Valid method of the cell (text box).

 

by: tusharkanvindePosted on 2009-05-22 at 21:41:10ID: 24456728

Maybe you want the BeforeRowColumnChange instead.

 

by: Olaf_DoschkePosted on 2009-05-23 at 03:18:01ID: 24457334

First, use AfterRowColChange is really too late. For validation, why not use the valid event of the column's textbox?

Second, use buffering, and you have OLDVAL() and TABLEREVERT() to revert to the old value, no need to store the old value yourself.

Attached is an example that will not accept more than the maximum values. If you enter more than #maximum the value is automatically restored to the value as it was initial. As soon as you save valid inputs, these are then the values, to which the valid event restores, if you enter too high values.

examples of usage:
1. enter 11 in the first row, and leave it, it will revert to 1, as 11 > 10 (qtyreq)
2. enter 9 in the first row, save, then enter 11 and leave, the value will revert to 9 now, not to 1.
3. enter 5 in several rows, click "Revert" and values will be back to the last saved values.

If you always want to revert to the last entered value, then set the buffering to 3 instead of 5 in the Load event of the form class, this way only the current record is buffered.

Bye, Olaf.

***************************************************
* Class Browser modifications by Arto Toikka 2005 *
* =============================================== *
*                                                 *
* Mode 2                                          *
* View Code generated: 05/23/09                   *
***************************************************
 
PUBLIC oform
oform=NEWOBJECT("form1")
oform.Show(1)
 
DEFINE CLASS form1 AS form
	Height = 292
	Width = 375
	Caption = "Form1"
 
	ADD OBJECT grid1 AS grid_1
	ADD OBJECT command1 AS commandbutton_1
	ADD OBJECT command2 AS commandbutton_2
 
	PROCEDURE Load
		Create Cursor curOrderquantities (qtyord I, qtyreq I)
		For i = 1 to 10
		   Insert into curOrderquantities values (i, i*10)
		EndFor
		Go Top
 
		Set Multilocks on
		CursorSetProp("Buffering",5,"curOrderquantities")
	ENDPROC
ENDDEFINE
 
DEFINE CLASS grid_1 AS grid
	ColumnCount = 0
	DeleteMark = .F.
	Height = 228
	Left = 12
	Top = 12
	Width = 348
 
	PROCEDURE Init()
	    This.MemberClassLibrary = 'c:\my\vfp\tests\validate.prg'
	    This.MemberClass = 'column_1'
	    This.ColumnCount = 1
	    
	    This.Columns(1).header1.caption = "#entered"
	    This.Columns(1).CurrentControl = 'Text_1'
 
	    This.MemberClassLibrary = ''
	    This.MemberClass = ''
	    This.ColumnCount = 2
	    
	    This.columns(2).header1.caption = "#maximum"
	    This.columns(2).readonly = .T. 
	    
	    This.RecordSource = 'curOrderquantities'
	    This.RecordSourceType = 1
	ENDPROC
EndDefine
 
Define Class column_1 as Column
   Add Object Text_1 as textbox_1
EndDefine 
 
DEFINE CLASS textbox_1 AS textbox
	PROCEDURE Valid
		If This.Value > curOrderquantities.qtyreq
		   This.Value = Oldval("curOrderquantities.qtyord")
		EndIf 
	ENDPROC
ENDDEFINE
 
DEFINE CLASS commandbutton_1 AS commandbutton
	Top = 252
	Left = 180
	Height = 27
	Width = 84
	Caption = "Revert"
 
	PROCEDURE Click
		TableRevert(.T.,"curOrderquantities")
		Thisform.Refresh()
	ENDPROC
ENDDEFINE
 
DEFINE CLASS commandbutton_2 AS commandbutton
	Top = 252
	Left = 276
	Height = 27
	Width = 84
	Caption = "Save"
 
	PROCEDURE Click
		TableUpdate(.T.,.F.,"curOrderquantities")
		Thisform.Refresh()
	ENDPROC
ENDDEFINE

                                              
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by: Olaf_DoschkePosted on 2009-05-24 at 12:44:32ID: 24462716

A comment on the code I posted: You can put it in a prg called "validate.prg". You don't need to put it into the path "'c:\my\vfp\tests\validate.prg", but wherever you save it, change the Line with that absolute path to whatever prg you save the code to.  Then run to see how it works.

You can do the same visually by adding mostly only the valid code to the Text1 Textbox of the grid column for entering the qtyord field value.

This code is generated by the Class Browser from a simple SCX (in fact with a modified version of the Class Browser capable to create runnable code of forms with grids called ClassBrowserX from the VFPX codeplex project)  I could also forward to you, if you like.

The two main ingredients are putting your recordsource alias (table) into buffermode 5 or 3, the valid event code in the textbox within the column for entering the qtyord and using tableupdate() to save changes.

Bye, Olaf.

 

by: leemarcPosted on 2009-05-26 at 13:03:23ID: 31585496

I came to the same conclusion you did just as I received your recommendation. Moving the test the valid event of the cell's text box cotnrol did the trick - Thank you

20120131-EE-VQP-002

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