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Combo Box

How to create a "auto-fill" style combobox AND allows to add value not found by mgagnon
Posted: 16 Apr 02 (Edited 7 Jul 03)

Create a combobox class and add the following:


In the InterActive Event of the ComboBox:


LOCAL lnStyle, lnLastKey, lcDisplayValue
lnLastKey=lastkey()
lnStyle = this.style
IF this.style = 2
    this.style = 0
ENDI
IF (lnLastKey>=32 and lnLastKey<=126)
    IF this.selstart>=1
        lcDisplayValue=substr(this.displayvalue,1,this.selstart-1)+(chr(lnLastKey))
    ELSE
        lcDisplayValue=(chr(lnLastKey))+allt(this.displayvalue)
    ENDI
    IF empty(lcDisplayValue)
        lcDisplayValue=allt(chr(lnLastKey))
    ENDI
    FOR i = 1 to this.listcount
            If Upper(lcDisplayValue) == Upper(Substr(This.List(i),1,Len(lcDisplayValue)))
                This.DisplayValue=This.List(i)
                This.SelStart=Len(lcDisplayValue)
                nlLength=Len(Allt(This.DisplayValue))-Len(lcDisplayValue)
                This.SelLength=Iif(nlLength <0,0,nlLength)
                this.lastdisplayvalue = this.displayvalue
                this.lastselstart = this.selstart
                this.lastsellength = this.sellength
                RETURN
            ENDI
    ENDFOR
ENDIf


In the combobox requery:


this.Value = this.DisplayValue && Just to reset the display value


In the valid of the combobox:


If !Empty(This.DisplayValue)
    Local cTableName,cFieldName,nAnswer,cValue
    Store Juststem(This.RowSource) To cTableName &&Won't work for VFP5.0
    Store Justext(This.RowSource) To cFieldName && This is normally used for 3 character extension, but it works for any lenght. Won't work for VFP5.0
    Select (cTableName)
    Locate For &cFieldName = This.DisplayValue
    If !Found()
        nAnswer = Messagebox("This value was not found in the table,"+Chr(13)+"Do you want to save it in the table?",36,"")
        If nAnswer = 6
            Insert Into &cTableName (&cFieldName) Values (This.DisplayValue)
            If CursorGetProp("Buffering") > 1  && Check to see if we should use tableupdate
                Tableupdate(1,.T.,cTableName)
            ENDIF
        this.Requery() && To reset the display value
        Else
            Store '' To This.DisplayValue
        Endif
    Endif
ENDIF


Note: Properties to be created in the comboxbox class.

1. acstyle (Default value = 2)
2. lastdisplayvalue  (Default value = [none])
3. lastsellength (Default value = 0)
4. lastselstart (Default value = 0)

**********************
Mike Gagnon
Note : this code was also modified to accomodate spaces in a name.
 Thanks to viettla

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