How Can I Create A Searchtextbox With Autocomplete?

Question

0.00/5 (No votes)

See more:

, +

I there,

I'm trying to create a AutoCompleteExtender in a textbox but nothing happens when i write something on it.

My asp.net code its this:

ASP.NET

<<pre lang="xml">asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:TextBox ID="TextBox1" runat="server" Height="21px" Width="477px" AutoPostBack="true"></asp:TextBox>
                <asp:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server" ServicePath="~/AutoComplete.asmx"
                    ServiceMethod="AutoCompleteSearch" TargetControlID="TextBox1" MinimumPrefixLength="1" CompletionSetCount="10" >
                </asp:AutoCompleteExtender>
            </ContentTemplate>
        </asp:UpdatePanel></pre>

and my web service its this one:

C#

[WebMethod]
  public string[] AutoCompleteSearch(string prefixText, int count)
  {

      DataSet ds = new DataSet();
      SqlDataAdapter sda = new SqlDataAdapter();
      sda.SelectCommand = new SqlCommand();
      sda.SelectCommand.Connection = new SqlConnection("PHCConnectionString");
      if (sda.SelectCommand.Connection.State == ConnectionState.Closed)
          sda.SelectCommand.Connection.Open();
      sda.SelectCommand.CommandType = CommandType.Text;
      sda.SelectCommand.CommandText = "Select (nome,' ',bino) as u_nome From cve ";
      sda.Fill(ds, "data");
      sda.SelectCommand.Connection.Close();

      string[] main = new string[0];
      for (int i = 0; i < ds.Tables[0].Rows.Count - 1;i++ )
      {
          if (ds.Tables[0].ToString().ToLower().StartsWith(prefixText.ToLower()))
          {
              Array.Resize(ref main, main.Length + 1);
              main[main.Length - 1] = ds.Tables[0].Rows[i].ItemArray[0].ToString();
              if (main.Length == 20)
                  break;
          }
      }
      Array.Sort(main);
      return main;
  }

can someone help me understand what i did wrong??

Posted 28-Jan-15 5:02am

Member 11375305

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2015-01-28T05:28:00

"Select (nome,' ',bino) as u_nome From cve "

That SQL query doesn't look right - if you're using MS SQL, you can't just wrap multiple values in brackets and expect SQL to concatenate them.

if (ds.Tables[0].ToString().ToLower().StartsWith(prefixText.ToLower()))

You're also only returning any data if the name of the first table starts with the prefix - you should be comparing the value instead.

Rather than reading every record from the table into memory and then using C# to filter and sort them, you should use SQL:

C#

[WebMethod]
public string[] AutoCompleteSearch(string prefixText, int count)
{
    using (SqlConnection connection = new SqlConnection("YOUR CONNECTION STRING HERE"))
    using (SqlCommand command = new SqlCommand("SELECT TOP (@Count) nome + ' ' + bino As u_nome From cve Where nome + ' ' + bino Like @Prefix Order By nome, bino", connection))
    {
        command.Parameters.AddWithValue("@Prefix", prefixText + "%");
        command.Parameters.AddWithValue("@Count", count);
        
        connection.Open();
        using (SqlDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection | CommandBehavior.SingleResult))
        {
            List<string> result = new List<string>(count);
            while (reader.Read())
            {
                result.Add(reader.GetString(0));
            }
            
            return result.ToArray();
        }
    }
}