VB.NET+AJAX搜索建議功能的實現

發布時間：2020-08-11 09:28:04 來源：ITPUB博客閱讀：126 作者：大禹編程欄目：編程語言

DE:Visual Web Developer 2008 Express Edition

DB:Access 2007

到http://www.asp.net/ajax/downloads/下載AJAX Control Toolkit，將AjaxControlToolkit.dll拷貝到項目的bin目錄下，在工具欄中引入。

在Web.config的<controls>...</controls>里加上

[xhtml] view plain copy

< add tagPrefix = "ajaxToolkit" namespace = "AjaxControlToolkit" assembly = "AjaxControlToolkit" />

WebService的代碼：（aaa.asmx）

[vb] view plain copy

<WebMethod()> _
<System.Web.Script.Services.ScriptMethod()> _
Public Function GetCompletionList( ByVal prefixText As String , ByVal count As Integer ) As String ()
Dim myConnection As OleDbConnection
Dim myCommand As OleDbCommand
Dim dbname As String
dbname = Server.MapPath( "location.accdb" )
myConnection = New OleDbConnection( "Provider=Microsoft.ACE.OLEDB.12.0;DATA Source=" & dbname)
myConnection.Open()
Dim list As New List(Of String )
myCommand = New OleDbCommand( "SELECT DISTINCT(columnName) FROM tableName WHERE columnName LIKE '" + prefixText & "%" + "'" , myConnection)
Dim reader As OleDbDataReader = myCommand.ExecuteReader()
Do While reader.Read
list.Add(reader.GetString(0))
Loop
Return list.ToArray()
End Function

FORM中的代碼：（aaa.aspx）

[xhtml] view plain copy

< asp:TextBox ID = "txtNo" runat = "server" autopostback = "true" Columns = "50" > </ asp:TextBox >
< ajaxToolkit:AutoCompleteExtender ID = "txtNo_AutoCompleteExtender" runat = "server" Enabled = "True" ServiceMethod = "GetCompletionList" ServicePath = "aaa.asmx" TargetControlID = "txtNo" MinimumPrefixLength = "1" EnableCaching = "true" >
</ ajaxToolkit:AutoCompleteExtender >

以上即可。

AJAX日期控件的使用也很方便，如：

[xhtml] view plain copy

< asp:TextBox ID = "txtDate" runat = "server" Columns = "24" > </ asp:TextBox >
< ajaxToolkit:CalendarExtender ID = "txtDate_CalendarExtender" runat = "server" Enabled = "True" TargetControlID = "txtDate" >
</ ajaxToolkit:CalendarExtender >

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