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You can m anually cont r ol t he oper at ion of t he Act ive Scr ipt ing feat ur e from t he I nt ernet Opt ions dialog box in an I nt er net Ex plor er 5 or lat er browser. Select I nt ernet Opt ions fr om t he Tools m enu, and t hen select t he Secur it y t ab. Click Cust om Level t o bring up t he Securit y Set t ings dialog box . Scr oll down t o Act iv e Script ing under Scr ipt ing. Then select Disable, Enable, or Prom pt depending on your pr efer ence for how you want t he feat ure t o operat e. Click OK t wice t o exit t he Secur it y Set t ings and I nt ernet Opt ions dialog box es.
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The list box displays t he cat egor y nam es and st or es t he Cat egoryI D v alues fr om t he Cat egor ies t able in t he Nort hw ind dat abase. When a user select s a cat egory nam e, t he list box highlight s t he select ion. The t ext box displays t he corr esponding Cat egory I D value for t he select ed cat egor y nam e in t he list box. The list box doesn t draw on t he sam e dat a source as t he Dat aGrid. The sam ple program m at ically cr eat es a SqlCom m and obj ect and t hen uses t he Execut eReader m et hod t o populat e t he list box based on t he SqlCom m and obj ect s Com m andText propert y . Figur e 11- 17 shows t he WebForm 1.aspx Web page in oper at ion im m ediat ely aft er t he select ion of t he Pr oduce cat egory . Because I ran t his sam ple on a com put er wit h it s Act ive Scr ipt ing feat ure disabled, it was necessary t o click t he but t on t o updat e t he Dat aGr id cont r ol so t hat it show ed product s for t he Produce cat egory . A user can change t he product s appear ing in t he Dat aGr id cont rol by select ing anot her cat egor y in t he list box and clicking t he but t on. I f t he br owser s Act iv e Script ing feat ure is enabled, changing t he select ion in t he list box w ill aut om at ically cause t he product s in t he dat a gr id t o be r ev ised wit hout a need t o click t he but t on. Figu r e 1 1 - 1 7 . W eb For m 1 .a spx in t h e List ToGr id pr oj e ct im m e diat ely aft e r a se le ct ion a n d click of t h e bu t t on .
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Code Be h ind t h e W eb Pa ge The code behind t he Web page handles t he m anagem ent of t he dat abase connect ivit y for t he cont rols on t he page. The code achiev es t his t ask by com plem ent ing and ext ending t he ADO.NET obj ect s in t he syst em t r ay as well as by creat ing ADO.NET obj ect s. All t he code behind t he page r esides in t he Page_Load ev ent procedure, but t w o ot her event pr ocedur es play piv ot al roles in t he applicat ion, alt hough t hey cont ain no code. The But t on1_Click ev ent procedure is a back up procedur e for sending t he Web page t o a Web serv er. The pr im ary vehicle for sending t he Web page t o a Web serv er aft er t he user m akes a select ion fr om t he list box is t he List Box1_Select edI ndex Changed procedure. Recall t hat I set t he Aut oPost Back propert y for t he list box t o Tr ue at design t im e. Ther efor e, t he page goes t o t he serv er aft er each select ion fr om t he list box, pr ov ided t he user s br owser enables t he Act iv e Script ing feat ur e. I f t his feat ure is t ur ned off ( or not available because a browser doesn t support it ) , a user can st ill send t he page t o t he Web serv er by click ing t he but t on. Neit her procedure has any code w it hin it . The only funct ion of t he procedures is t o send t he page t o t he Web ser ver. The Page_Load ev ent procedure is t r iggered t he first t im e a user opens WebForm 1.aspx in t he List ToGr id proj ect . The Page_Load event procedur e also fires on each subsequent visit t o t he Web serv er no m at t er w hich of t he ot her t wo ev ent procedures init iat es t he v isit . The code inside t he Page_Load event procedur e includes an I f Then st at em ent t hat execut es one block of code dur ing only t he first v isit t o t he Web ser ver w it hin a session t hat is, w hen Not ( Me.I sPost Back) is Tr ue as well as anot her code block t hat fir es on each subsequent page visit . The code block t hat ex ecut es only w hen Not ( Me.I sPost Back) is True populat es t he List Box cont rol w it h t wo colum ns from t he Cat egor ies t able. This block begins by declaring and inst ant iat ing t he SqlCom m and1 obj ect and assigning t o a Com m andText propert y set t ing a SQL quer y t hat ret urns all t he colum ns fr om all t he r ows in t he Cat egor ies t able. The use of t he Ex ecut eReader m et hod in an assignm ent st at em ent designat es t he Cat egory t able as t he Dat aSource propert y
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for List Box1. The assignm ent of Cat egor yNam e t o t he Dat aText Field pr opert y det erm ines t he colum n of values List Box1 shows. When a user select s a cat egory nam e, List Box1 saves a m at ching value from it s Dat aValueField pr opert y set t ing. Ther efor e, t he assignm ent of Cat egoryI D t o t he Dat aValueField pr opert y designat es t hat List Box 1 save a Cat egoryI D v alue t hat m at ches w hat ev er cat egory nam e a user select ed. I nvok ing t he Dat aBind m et hod t ies t he Dat aSource set t ing t o List Box1 for t he durat ion of t he set t ing. Before ex it ing t he Then clause, t he I f Then st at em ent select s t he first it em appear ing in List Box1, which corresponds t o t he cat egory nam e Bev er ages and t he Cat egory I D value 1. I m m ediat ely aft er ex it ing t he Then clause or ev en if t he clause doesn t ex ecut e, t he procedure assigns a value t o Text Box1 t hat equals List Box1 s Select edI ndex propert y value plus 1, w hich is t he sam e as Select edI t em ( t he select ed Cat egoryI D value) . On t he init ial page load for a session, Text Box1 w ill show t he value 1 because t he Then clause set s t he Select edI ndex propert y t o 0. Ot herwise, t he com put ed value appearing in Text Box1 w ill m at ch t he Cat egory I D for what ever it em a user select ed m ost recent ly fr om List Box1. The balance of t he Page_Load ev ent pr ocedur e aim s t o populat e Dat aGrid1. The process of populat ing t he Dat aGr id cont rol st art s by declar ing and inst ant iat ing a new Dat aSet obj ect ( ds1) and filling it w it h t he dat a source specified by t he SQL st at em ent for SqlDat aAdapt er1. This dat a sour ce includes a subset of t he colum ns from t he Pr oduct s t able, but it includes all t he r ows. Because t he applicat ion calls for t he Dat aGrid cont rol show ing j ust a subset of t he rows t hat depends on t he m ost recent ly select ed it em from List Box1, ds1 isn t an appropr iat e dat a source for Dat aGr id1. This is t he reason t hat t he procedure declares and inst ant iat es a Dat aView obj ect ( dav1) . The filt er for dav 1 is t he set of rows fr om ds1 t hat hav e a Cat egoryI D colum n v alue m at ching ( List Box1.Select edI ndex + 1) .ToSt ring, which is an expr ession t hat r et ur ns t he Cat egor yI D for t he m ost r ecent ly select ed it em in t he list box . Aft er com put ing dav1, t he procedure concludes by assigning it t o t he Dat aSource propert y for Dat aGr id1. Finally t he pr ocedur e concludes by inv ok ing t he Dat aBind m et hod for Dat aGr id1. Wit hout t his st ep, t he Dat aSource propert y for Dat aGr id1 would not updat e t o show t he m ost recent ly select ed it em from List Box1. This procedure depends on drag-and-drop instantiation of SqlConnection1 and SqlDataAdapter1 for selected columns from the Products tables in the northwind database. Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load If Not (Me.IsPostBack) Then Setup SqlCommand1 with SqlConnection1 for ListBox1. Dim SqlCommand1 As New SqlClient.SqlCommand() SqlCommand1.CommandText = SELECT * FROM Categories" SqlCommand1.Connection = SqlConnection1 SqlConnection1.Open() Assign CategoryName and CategoryID to ListBox1. ListBox1.DataSource = SqlCommand1.ExecuteReader() ListBox1.DataTextField = CategoryName" ListBox1.DataValueField = CategoryID" ListBox1.DataBind() SqlConnection1.Close() Select first item in ListBox1. ListBox1.SelectedIndex = 0 End If Assign to ListBox1 Selected item + 1, which is the same as CategoryID value.
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TextBox1.Text = (ListBox1.SelectedItem).ToString Fill Products data table from northwind database. Dim ds1 As New DataSet() SqlDataAdapter1.Fill(ds1, Products ) Specify filter for dav1 based on selected item in ListBox1. Dim dav1 As New DataView(ds1.Tables( Products )) Dim strFilter As String strFilter = CategoryID = & _ (ListBox1.SelectedIndex + 1).ToString dav1.RowFilter = strFilter Assign dav1 as data source for DataGrid1 and bind source to data grid. DataGrid1.DataSource = dav1 DataGrid1.DataBind() End Sub Private Sub ListBox1_SelectedIndexChanged( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles ListBox1.SelectedIndexChanged AutoPostBack setting of True will generate event if Active Scripting is enabled. End Sub Private Sub Button1_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button1.Click Force postback if AutoPostBack setting of True does not operate. End Sub
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