D yna m ica lly D isa blin g a Va lida t or Cont r ol in Visual Basic .NET

Creation Data Matrix ECC200 in Visual Basic .NET D yna m ica lly D isa blin g a Va lida t or Cont r ol

D yna m ica lly D isa blin g a Va lida t or Cont r ol
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Som et im es you m ay want t he opt ion t o disable a validat or cont rol dy nam ically . This sit uat ion can arise in cases in w hich a user can t figur e out t he right form at for all t he fields but she has filled out enough of t he form on a Web page for y our organizat ion t o cont act her and resolve any inconsist ent dat a. For exam ple, if you hav e a valid phone num ber, y ou m ay be w illing t o accept an invalid e- m ail address or URL. To be able t o perform a t ask lik e t his, you need t he abilit y t o reference pr ogram m at ically t he indiv idual validat ors on a form . The sam ple in t his sect ion dem onst rat es how t o disable a v alidat or cont r ol at run t im e. Figur es 11- 29 and 11- 30 show a pair of w indow s t hat illust rat es t he disabling of a validat or cont rol at r un t im e. Figure 11- 29 shows WebForm 1.aspx in t he Validat or Collect ionSam ple pr oj ect aft er an at t em pt t o insert a new r ow int o t he
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ASPNETShippers t able wit h a fault y Phone value. ( I t ends wit h an r inst ead of a num ber.) Businesses use validat ors t o obt ain clean dat a. On t he ot her hand, som e t ransact ions m ay benefit a business m or e if t hey accept part ially fault y dat a. This exam ple offer s t he user a but t on for ent er ing a r ow ev en if t he Phone value is in t he w rong for m at . Figure 11- 30 show s t he Web page aft er a click of t he I nsert Bad Phone but t on. Not ice t hat t he r ecord ent ers t he t able ( because it shows a ShipperI D value) , ev en t hough t he record has invalid dat a in t he Phone t ext box. While t he sam ple shown in Figur es 11- 29 and 11- 30 isn t v ery com pelling, select ed high- pr ior it y Web applicat ions, such as e- com m erce and gat hering cont act dat a, can benefit fr om accept ing part ially fault y dat a m or e t han losing a sit e v isit or or pot ent ial cust om er because t hey get frust rat ed by t he dat a validat ion process. For exam ple, y our code m ight giv e v isit ors one or t wo at t em pt s t o ent er an e- m ail address in a valid form at and t hen accept t he row so long as t he phone num ber and URL v alues ar e in a valid form at . Figu re 1 1 - 2 9 . Th e Re gu la rEx pr ession V alidat or con t r ol for Ph on e valu e s block ing t h e en t r y of a r ow .
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Figu re 1 1 - 3 0 . Th e Re gu la rExp re ssion V alida t or con t r ol disa b led so t h a t t h e sa m e row ca n en t er a t a ble in a SQL Se rve r d a t a ba se .
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The follow ing list ing shows t he Click ev ent pr ocedur e behind t he but t on ( it s nam e is cm dI nsert Anyway ) t hat allows t he insert ion of a row w it h an invalidly form at t ed Phone value. Recall t hat t he obj ect iv e of t his applicat ion is t o disable a select ed validat or cont rol. Ther efor e, you need t o be able t o addr ess t he validat or cont rols indiv idually . Happily, t he Validat ors propert y in t he Page obj ect cont ains obj ect s point ing t o all t he validat or cont r ols on a page. ASP.NET perm it s t he declarat ion of an obj ect based on t he Validat or Collect ion class t hat cont ains t he it em s in t he Page. Validat ors pr opert y. A Dim st at em ent t oward t he t op of t he pr ogr am list ing illust rat es t he synt ax for declar ing an obj ect point er, m y Collect ion, for t he validat ors on t he page. You can r efer ence t he obj ect s wit hin m y Collect ion by an index value. The com m ent ed code block im m ediat ely aft er t he Dim st at em ent for m y Collect ion shows one approach t o enum erat ing t he m em bers of t he collect ion. I t displays t he it em num ber , w hich serv es as an index value, and t he Er rorMessage propert y for t he obj ect s in t he m y Collect ion obj ect . Fr om running code lik e t his, I was able t o det erm ine t hat t he RegularExpr essionValidat or for t he Phone value was m y Collect ion( 0) . Aft er adding a r ow t o t he local dat a t able w it h t he t ext box values and declaring t he m y Collect ion obj ect , t he pr ocedur e opens an I f Then ElseI f st at em ent . The procedur e t akes t he Then clause if t he user successfully fix ed t he Phone value on t he Web page. I f t he Phone v alue isn t in t he corr ect form at , t he pr ocedur e st ill ent ers t he r ecord in t he ElseI f clause. The condit ion for t he ElseI f clause is True when t he I sValid pr oper t y for m y Collect ion( 0) is False, but t he ot her t w o m em bers of t he m y Collect ion obj ect hav e I sValid propert y values of Tr ue. This synt ax shows how t o disable t em porar ily j ust t he Regular Expr essionValidat or cont r ol for t he Phone t ext box . The next t im e t he user t r ies t o ent er a new row , t he validat or for t he Phone t ext box w ill operat e ( unless t he user disables it again) .
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Private Sub cmdInsertAnyway_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdInsertAnyway.Click Add text box values to new row in dataset Shippers table. Dim newRow As DataRow = das1.Tables( ASPNETShippers ).NewRow() newRow( CompanyName ) = TextBox2.Text newRow( Phone ) = TextBox3.Text das1.Tables( ASPNETShippers ).Rows.Add(newRow) Get Validators of the page to myCollection. Dim myCollection As ValidatorCollection = Page.Validators Uncomment from next Dim to the Next statement in the For loop to match ValidatorCollection index numbers to validator controls. Dim int1 As Integer Dim str1 As String For int1 = 0 To myCollection.Count - 1 str1 = CStr(int1) & , & _ myCollection.Item(int1).ErrorMessage & <br>" Response.Write(str1) Next Update method synchronizes inserted local row with its copy in northwind and returns the identity column value added by the northwind database. If Me.IsValid Then Do normal Insert if Phone OK dap1.Update(das1, ASPNETShippers ) Move to last row and populate text boxes Session( MyRowID ) = _ das1.Tables( ASPNETShippers ).Rows.Count - 1 MoveToRow() ElseIf (Not (myCollection.Item(0).IsValid) _ And (myCollection.Item(1).IsValid)) _ And (myCollection.Item(2).IsValid) Then Do insert anyway if just phone format bad dap1.Update(das1, ASPNETShippers ) Move to last row and populate text boxes Session( MyRowID ) = _ das1.Tables( ASPNETShippers ).Rows.Count - 1 MoveToRow() End If End Sub
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