autopostback in a form submit [Resolved]

Posted by Jopito under ASP.NET on 12/5/2013 | Points: 10 | Views : 1473 | Status : [Member] | Replies : 13

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Hi friends,have got a certain dropdown combobox which got a item studentId,am planning to use a postback on the control dropdown such that when that student Id is selected ,then the next textbox with a value age should be autofilled.What i need guidance is to someone explain me this techniqque correctly as how i can use the selected index changed sought of event for auto postback,on my part i was thinking to pass the query string,and then on page load thats where i would use that code.......

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Posted by: vishalneeraj-24503 on: 12/5/2013 [Member] [MVP] Platinum | Points: 50

0	Inside page-load event,you have to only fill your Student Dropdown-List and inside Student Dropdownlist-SelectedIndexChanged event,you have to write your code. Suppose,you have dropdownlist named ddl_student protected void ddl_student_SelectedIndexChanged() { if(ddl_student.Items.Count>0) { txt_age.Text = ddl_student.SelectedValue; //here,SelectedValue will be your student age. } } Please let me know. Jopito, if this helps please login to Mark As Answer. \| Alert Moderator

Inside page-load event,you have to only fill your Student Dropdown-List and inside Student Dropdownlist-SelectedIndexChanged event,you have to write your code.

Suppose,you have dropdownlist named ddl_student
protected void ddl_student_SelectedIndexChanged()
{
if(ddl_student.Items.Count>0)
{
txt_age.Text = ddl_student.SelectedValue;

//here,SelectedValue will be your student age.
}
}

Please let me know.

Jopito, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Allemahesh on: 12/5/2013 [Member] [MVP] Silver | Points: 50

0	Dear Jopito, Below is complete code for you requirement. .aspx code: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <table width="50%" cellpadding="1" cellspacing="1"> <tr> <td> <asp:DropDownList ID="ddlStudent" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlStudent_SelectedIndexChanged"> </asp:DropDownList> </td> <td> <asp:TextBox ID="txtAge" runat="server"></asp:TextBox> </td> </tr> </table> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html> c# code:- public partial class Default2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { loadDroupDownList(); } } public void loadDroupDownList() { try { ddlStudent.Items.Clear(); for (int i = 1; i < 11; i++) { ddlStudent.Items.Add(new ListItem("Student " + i, Convert.ToString(i + 20))); } ddlStudent.Items.Insert(0, new ListItem("-- Select --", "-- Select --")); } catch { throw; } } protected void ddlStudent_SelectedIndexChanged(object sender, EventArgs e) { txtAge.Text = string.Empty; if (ddlStudent.SelectedIndex > 0) { txtAge.Text = Convert.ToString(ddlStudent.SelectedValue); } } } Please let me know if you have any issue. If this helps you towards the solution, click on MARK IT AS ANSWER Happy Coding. Jopito, if this helps please login to Mark As Answer. \| Alert Moderator

Dear Jopito,

Below is complete code for you requirement.

.aspx code:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <table width="50%" cellpadding="1" cellspacing="1">
                    <tr>
                        <td>
                            <asp:DropDownList ID="ddlStudent" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlStudent_SelectedIndexChanged">
                            </asp:DropDownList>
                        </td>
                        <td>
                            <asp:TextBox ID="txtAge" runat="server"></asp:TextBox>
                        </td>
                    </tr>
                </table>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    </form>
</body>
</html>

c# code:-

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            loadDroupDownList();
        }
    }

    public void loadDroupDownList()
    {
        try
        {
            ddlStudent.Items.Clear();
            for (int i = 1; i < 11; i++)
            {
                ddlStudent.Items.Add(new ListItem("Student " + i, Convert.ToString(i + 20)));
            }
            ddlStudent.Items.Insert(0, new ListItem("-- Select --", "-- Select --"));
        }
        catch
        {
            throw;
        }
    }

    protected void ddlStudent_SelectedIndexChanged(object sender, EventArgs e)
    {
        txtAge.Text = string.Empty;
        if (ddlStudent.SelectedIndex > 0)
        {
            txtAge.Text = Convert.ToString(ddlStudent.SelectedValue);
        }
    }
}

Please let me know if you have any issue.

If this helps you towards the solution, click on MARK IT AS ANSWER

Happy Coding.

Jopito, if this helps please login to Mark As Answer. | Alert Moderator