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How to programatically select an item from the ComboBox?

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  1. #1
    Mar 02, 2012, 9:46 AM

    How to programatically select an item from the ComboBox?

    For a standard ASP.NET DropDownControl, I used this code to select an item from the DropDown:

    DropDown1.SelectedIndex = DropDown1.Items.IndexOf(DropDown1.Items.FindByText ("John F"));
    How to do the same with ext.net ComboBox control?

    I tried:

    ComboBox1.SelectedItem.Text = "John F";

    But this displays the name on the ComboBox but it doesn't returns the Value Member of the selected item.
  2. #2
    Mar 02, 2012, 9:51 AM
    Hi,

    But this displays the name on the ComboBox but it doesn't returns the Value Member of the selected item.
    Please provide a sample to reproduce.
  3. #3
    Mar 03, 2012, 3:59 AM
    Quote Originally Posted by Daniil View Post
    Hi,
    Please provide a sample to reproduce.
    Create a ComboBox and fill three items with values associated with them.

    For exmaple:

    Display Member Value Member
    ------------------------------------------------
    Item1 .... 001
    Item2 .... 002
    Item3 .... 003

    Now programatically select second item using:
    ComboBox1.SelectedItem.Text = "Item2";
    You won't get it's value member, if you try:

    MessageBox.Show(ComboBox1.SelectedItem.Value.ToString());
    Last edited by Daniil; Mar 05, 2012 at 8:53 AM. Reason: Please use [CODE] tags
  4. #4
    Mar 03, 2012, 10:25 AM
    At the same DirectEvent request?

    Yes, there is no such functionality to fill SelectedItem.Value basing on SelectedItem.Text.
  5. #5
    Mar 05, 2012, 3:45 AM
    Quote Originally Posted by Daniil View Post
    At the same DirectEvent request?
    Yes, there is no such functionality to fill SelectedItem.Value basing on SelectedItem.Text.
    Let me clarify.

    I don't want to fill Values. The ComboBox is already filled with Items (Display Member) and Values (Value Member).

    When I directly select an item from ComboBox, I am able to select an item and value.

    But when I select an item using code-behind (.cs), I am not able to pick the Value of the Item.

    I want to know how to select an item using .cs code.
  6. #6
    Mar 05, 2012, 8:53 AM
    Got it.

    When you call
    ComboBox1.SelectedItem.Text = "Item2";
    it sets ComboBox value to "item2", not just its text.

    You should select an item by its index or value, i.e:
    this.ComboBox1.SelectedIndex = 1;
    or
    this.ComboBox1.SelectedItem.Value = "2";
    Example
    <%@ Page Language="C#" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            Store store = this.ComboBox1.GetStore();
            store.DataSource = new object[] 
            { 
                new object[] { "1", "item1" },
                new object[] { "2", "item2" },
                new object[] { "3", "item3" }
            };
            store.DataBind();
        }
    }

    protected void Select(object sender, DirectEventArgs e)
    {
        this.ComboBox1.SelectedIndex = 1;
    }

    protected void Get(object sender, DirectEventArgs e)
    {
        X.Msg.Alert("Value", this.ComboBox1.SelectedItem.Value).Show();
    }
</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Ext.NET Example</title>
</head>
<body>
    <form runat="server">
        <ext:ResourceManager runat="server" />
        <ext:ComboBox ID="ComboBox1" runat="server">
            <Store>
                <ext:Store runat="server">
                    <Reader>
                        <ext:ArrayReader>
                            <Fields>
                                <ext:RecordField Name="value" />
                                <ext:RecordField Name="text" />
                            </Fields>
                        </ext:ArrayReader>
                    </Reader>
                </ext:Store>
            </Store>
        </ext:ComboBox>
        <ext:Button runat="server" Text="Select the 2nd item" OnDirectClick="Select" />
        <ext:Button runat="server" Text="Get SelectedItem.Value" OnDirectClick="Get" />
    </form>
</body>
</html>
  7. #7
    Mar 05, 2012, 1:12 PM
    Hi,

    I have the same problem, I put de code to select the item in .cs by using selecteditem.value. The selectedvalue (Value Member) it´s Ok, but the Display Member is wrong, the combobox show the same value of Value Member. If I click in the item, the display member change it´s update to the to the Display Member.

    Code to fill the records:
        private void posicionarFuncionario()
    {
        var lista = from f2 in dc.Funcionarios.AsEnumerable() where f2.IdFuncionario == 1 select new { IdFuncionario = 0, NomeFuncionario = "Selecionar" };

        var lista2 = (lista.Union(from f in dc.Funcionarios.AsEnumerable()
                                  select new
                                  {
                                      f.IdFuncionario,
                                      f.NomeFuncionario
                                  }));

        this.Store1.DataSource = lista2;
        this.Store1.DataBind();
    }
    Code to select the item:
    ddlFuncionario.SelectedItem.Value = usu.IdFuncionario.ToString();
    How can I do to correct this?

    Thanks!
  8. #8
    Mar 05, 2012, 7:30 PM
    Hello!

    I solve my problem setting the property AutoLoad=true for the Store. Now the Display Value is correct when the form is show.
  9. #9
    Mar 09, 2012, 2:02 PM
    My ComboBox is loaded with query when the page loads. I programatically select an item using:

    ComboBox1.setValue("Item 3");
    But with this method I am not able to get Value. The Display Member is available but the Value Member is not available.

    I tried:

    ComboBox1.SelectedItem.Value
    but gives error till the time I manually re-select the Item from the ComboBox.
    Last edited by geoffrey.mcgill; Oct 27, 2012 at 4:44 PM.
  10. #10
    Oct 27, 2012, 10:35 AM

    I have the same problem please help.........

    hi im using the v2 version i write the code in the below code

    ComboBox1.setValue("3")
    it will set the value for combobox1 but it disply the id , i want to display the text field of that related id please hellp.......
    Last edited by geoffrey.mcgill; Oct 27, 2012 at 4:44 PM. Reason: please use [CODE] tags
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