AJAX combo box not searching specific letters in the word (data) in asp.net C#

Gani_tpt 1,466 Reputation points

I am using AJAX dropdown controls for dual purpose (Search and select). I have been facing some issue in that controls. When i search the particular "letter", it wil not be filtered data in the combo box. What is the problem and how to solve this...? Pls. help and this is urgent

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Accepted answer
  1. Lan Huang-MSFT 25,156 Reputation points Microsoft Vendor

    Hi @Gani_tpt, From your description, the AJAX ComboBox won't do what you want because the input is a dropdown and it will only select the data you are searching for. User's image

    You can achieve the effect you want with the jQuery AutoComplete method. https://jqueryui.com/autocomplete/ Below is a simple example for your reference.

    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.10.0.min.js" type="text/javascript"></script>
        <script src="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/jquery-ui.min.js" type="text/javascript"></script>
        <link href="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/themes/blitzer/jquery-ui.css"
            rel="Stylesheet" type="text/css" />
        <script type="text/javascript">
            $(function () {
                    source: function (request, response) {
                            url: '<%=ResolveUrl("~/WebForm1.aspx/GetCustomers") %>',
                        data: "{ 'prefix': '" + request.term + "'}",
                        dataType: "json",
                        type: "POST",
                        contentType: "application/json; charset=utf-8",
                        success: function (data) {
                            response($.map(data.d, function (item) {
                                return {
                                    label: item.split('-')[0],
                                    val: item.split('-')[1]
                        error: function (response) {
                        failure: function (response) {
                select: function (e, i) {
                minLength: 1
        <form id="form1" runat="server">
                Enter search term:
                <asp:TextBox ID="txtSearch" runat="server" />
                <asp:HiddenField ID="hfCustomerId" runat="server" />
     Public Shared Function GetCustomers(prefix As String) As String()
         Dim customers As New List(Of String)()
         Using conn As New SqlConnection()
             conn.ConnectionString = ConfigurationManager.ConnectionStrings("constr").ConnectionString
             Using cmd As New SqlCommand()
                 cmd.CommandText = "select Name, CustomerId from Customers where Name like @SearchText + '%'"
                 cmd.Parameters.AddWithValue("@SearchText", prefix)
                 cmd.Connection = conn
                 Using sdr As SqlDataReader = cmd.ExecuteReader()
                     While sdr.Read()
                         customers.Add(String.Format("{0}-{1}", sdr("Name"), sdr("CustomerId")))
                     End While
                 End Using
             End Using
         End Using
         Return customers.ToArray()
     End Function

    Best regards,
    Lan Huang

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