sorting datalist items on onkeypress event

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i have a datalist above which i have a textbox.
and what i want to do is as i enter a character in textbox, only items corresponding to that char should b filled in datalist.and all process should be on onkeypress event of textbox

NOTE: there is only 900 names list in datalist.

Posted 10-Oct-11 0:55am

choudhary.sumit

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Muralikrishna8811 10-Oct-11 7:02am

you want to sort that data in c# or Jquery

2 solutions

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MZwahlen · Answer 1 · 2011-10-10T01:10:00

You have to use autopostback, or (faster) ajax like this:

XML

<asp:TextBox runat="server" ID="txtFilter" autocomplete="off" ></asp:TextBox>
<asp:LinkButton runat="server" ID="lbFilter" onclick="FilterDropdown" Text="filter" style="visibility:hidden;"></asp:LinkButton>
<asp:ScriptManager runat="server" ID="scrMang"></asp:ScriptManager>
<asp:UpdatePanel ID="updSelction" runat="server">
    <ContentTemplate>
        <asp:ListBox runat="server" ID="ddl" ></asp:ListBox>
    </ContentTemplate>
    <Triggers >
        <asp:AsyncPostBackTrigger ControlID="lbFilter" />
    </Triggers>
</asp:UpdatePanel>

C#

public partial class _Default : System.Web.UI.Page
{
    string[] Names = {"Andreas",
                     "Benjamin",
                     "Caroline",
                     "Daniel",
                     "Emil",
                     "Franziska",
                     "Gustav",
                     "Hans"
                     };
    protected void Page_Load(object sender, EventArgs e)
    {
        txtFilter.Attributes.Add("onkeyup", "__doPostBack('" + lbFilter.UniqueID + "','');");
        if(!IsPostBack) {
            foreach(var name in Names) {
                ddl.Items.Add(name);
            }
        }
    }

    protected void FilterDropdown(object sender, EventArgs e) {
        ddl.Items.Clear();
        foreach(var name in Names) {
            if(name.ToLower().Contains(txtFilter.Text.ToLower())) {
                ddl.Items.Add(name);
            }
        }
        txtFilter.Focus();
        if(ddl.Items.Count >0)
        ddl.Items[0].Selected = true;
    }
}

I.explore.code · Answer 2 · 2011-10-12T11:38:00

If you know how to use LINQ then you can write only a couple of lines of code and achieve the desired outcome:

C#

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            string search = textBox1.Text;
            listBox1.DataSource = (from l in list where l.Contains(search) select l).ToList();
        }

"list" is just a simple list of strings defined in the constructor and populated. Try it and hack around with it.

Cheers...

EDIT: here is a good start for LINQ if you don't already know it, http://msdn.microsoft.com/en-us/netframework/aa904594[^]

EDIT: use

C#

l.StartsWith(search)

instead of

C#

l.Contains(search)

which does a wild search. StartsWith searches for the beginning of the string which is more accurate.

sorting datalist items on onkeypress event

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