populate dropdown using a textbox asp.net

Question

enter image description here How to populate a drop down when user enters some text in text box, i have tried using text changed event in the text box control it works, but needs to click twice the drop down, when i clicked first it loads the data and drop drown gets closed, then i again click it shows i used asp text box and asp drop down

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true">  
        </asp:TextBox>

Private Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

    DropDownList1.Items.Clear()
    DropDownList1.Items.Add(TextBox1.Text)
    Dim icount As Integer
    icount = DropDownList1.Items.Count
    DropDownList1.Items.Add("Select")
    DropDownList1.SelectedIndex = icount
End Sub

enter image description here

are you trying to add only one value + select option to the on the text changed dropdown? — Sachin
– Sachin, Commented Feb 14, 2014 at 5:30
You can use OnTextChanged="DropDownList1" in your textbox property — Shreyas Achar
– Shreyas Achar, Commented Feb 14, 2014 at 5:33
i getting populated in the dropdown, but the dropdown getting closed on first time click , when i leave from the textbox — mcbalaji
– mcbalaji, Commented Feb 14, 2014 at 6:27

Aditi · Accepted Answer · 2014-02-14 06:49:55Z

1

Try this:

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
    </asp:DropDownList>

and then :

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        int count = Convert.ToInt32(this.TextBox1.Text);
        for (int i = 1; i <= count; i++)
        {
            this.DropDownList1.Items.Add(i.ToString());
        }

    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Response.Write("Selected Value Is :" + this.DropDownList1.SelectedValue);
    }

Please let me know if you have some difficulty.

edited Feb 14, 2014 at 6:49

answered Feb 14, 2014 at 5:36

Aditi

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6 Comments

mcbalaji Over a year ago

my code <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true"> </asp:TextBox> <br /> <br /> <asp:DropDownList ID="DropDownList1" runat="server" Height="16px" Width="492px"> </asp:DropDownList> </div> </form> </body>

Aditi Over a year ago

Try writing Autopostback = "True" event in your dropdown list in the manner that I have written above.

mcbalaji Over a year ago

i getting populated in the dropdown, but the dropdown getting closed on first time click , when i leave from the textbox

Aditi Over a year ago

Can you please send an image on how it is getting closed?

Aditi Over a year ago

I think as soon as you write something in the textbox, it goes to the textchange event and there as dropdown list is to be cleared all the elements are getting cleared and only Select appears. Please paste the code that i have given and try out. It should work.

|

Revan · Accepted Answer · 2014-02-14 05:51:39Z

0

Example : txtCity.text = "Mysore,Bangalore,Delhi"

protected void txtCity_TextChanged(object sender, EventArgs e)
{
    string[] _cities=this.txtCity.text.split(',');
    int _maxCities = _cities.count();
    for (int _item = 1; _item <= _maxCities; _item++)
    {
        this.ddlCity.Items.Add(_item.ToString());
    }

}

answered Feb 14, 2014 at 5:51

Revan

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1 Comment

mcbalaji Over a year ago

able to add in the dropdown, but when i click first time it get closed, because of loading data

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