Fill Dropdown if other dropdown index changed using AJAX

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Appriciate u can let me the precious solution :

I have a project in which i have to fill the DropDownList(DDProjectIDList from database), and if user select the projectID, then corresponding customer list(DropDownList) must be filled . These all data is there in the sql database.

I have to do it by AJAX.

Thanx for your help
Shaan

Posted 27-May-10 21:36pm

shanawazway

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Sandeep Mewara · Answer 1 · 2010-05-27T23:23:00

Solution 1

Use Google or Use Code Project Search...
Use:Cascading Dropdown + ASP.NET as keywords...

you would get lots of material, code, control on it!

Posted 27-May-10 23:23pm

Sandeep Mewara

Narsimlu Keshagouni · Answer 2 · 2010-05-28T02:30:00

Solution 2

Shaan,

Follow the steps
1. Place both the dropdowns in a UpdatePanel.
2. Add onchange event for the first dropdown.
3. In the event handler fill the second dropdown (on serverside only as do for any other).

Posted 28-May-10 2:30am

Narsimlu Keshagouni

sainath437 · Answer 3 · 2010-05-28T02:45:00

Shaan
here i changed the state based on the country ..

in javascript add this.. based on ur requirement..

<pre lang="xml"><asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>

    <asp:DropDownList ID="ddlcountry" runat="server" AutoPostBack="True"
            onselectedindexchanged="ddlcountry_SelectedIndexChanged" >
    </asp:DropDownList>
        <br />
        <br />
    <br />
    <asp:DropDownList ID="ddlstate" runat="server"
            
            AutoPostBack="True" ></asp:DropDownList>

and in codebahind jst add bind the data for example in ddlcountry_SelectedIndexChanged event(i have used LINQ)

IEnumerable<State> res = db.States.Where(s => s.CountryId ==int .Parse (ddlcountry.SelectedValue));<br />
ddlstate.DataSource = sl;<br />
        ddlstate.DataTextField = "StateName";<br />
        ddlstate.DataValueField = "StateId";<br />
        <br />
        ddlstate.DataBind();<br />
<br />