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Getting control value when switching a view as part of a multiview

开发者 https://www.devze.com 2023-03-01 04:57 出处:网络
I have the following code in my aspx page: <asp:Button id=\"display_button\" runat=\"server\" Text=\"Display\" OnClick=\"Button1_Click\" /> &nbsp;

I have the following code in my aspx page:

<asp:Button id="display_button" runat="server" Text="Display" OnClick="Button1_Click" /> &nbsp;
<asp:Button id="edit_button" runat="server" Text="Edit" OnClick="Button2_Click" /> &nbsp; 
<asp:Button id="save_button" runat="server" Text="Save" OnClick="Button3_Click" Visible="false" /> &nbsp; 

<asp:MultiView id="MultiView1" runat="server" ActiveViewIndex="0">
    <asp:View id="View1" runat="server">
        <asp:FormView id="view_program" runat="server"> 
        <ItemTemplate>
            <%# Eval("status").ToString().Trim() %>
        </ItemTemplate>
        </asp:FormView>
    </asp:View>
    <asp:View id="View2" runat="server">
        <asp:FormView id="edit_program" runat="server"> 
        <ItemTemplate>
            <asp:DropDownList id="p_status" runat="server">
            </asp:DropDownList>
        </ItemTemplate>
        </asp:FormView>
    </asp:View>
</asp:MultiView>  

and the following functions attached to the buttons in the code-behind page:

protected void Button1_Click(object sender, EventArgs e)
{
    MultiView1.SetActiveView(View1);
    save_button.Visible = false;
}

protected void Button2_Click(object sender, EventArgs e)
{
    MultiView1.SetActiveView(View2);
    save_button.Visible = true;
}

protected void Button3_Click(object sender, EventArgs e)
{
    DropDownList p_status = edit_program.FindControl("p_status") as DropDownList;
    var status = p_status.SelectedValue;
    Label1.Text = status;
    //save_button.Visible = false;
    //MultiView1.SetActiveView(View1);
}

The idea being, that there are two views, the first displays the information, if the user wants to edit the information, they click button 2 which changes the view to the edit mode, which has the controls (drop downs, text fields, etc). It also makes the 'save' button appear.

What I am trying to make happen is, when the save button is clicked, it will grab all of the values from the various fields, update the object and then update the database. Then it would flip b开发者_StackOverflowack to view1 with the updated info.

Problem is, as you can see in void Button3_Click, I try grab the values from the control, p_status, but it only gets the original value. example, the menu has three values, 'Green', 'Yellow', and 'Red'. Green is the default value and is selected when view2 is displayed. However, if I select Yellow or Red, and click save, rather than the label being updated to display one of those two values, it always displays Green.

Any ideas?

edit: page load function per request below

protected void Page_Load(object sender, EventArgs e)
{
    try
    {
    Person myPerson = new Person(userid);
    TestProgram myProgram = new TestProgram(id);

    List<TestProgram> program = new List<TestProgram> { myProgram };

    view_program.DataSource = program;
    view_program.DataBind();
    edit_program.DataSource = program;
    edit_program.DataBind();


    DropDownList p_status = edit_program.FindControl("p_status") as DropDownList;
    p_status.Items.Add(new ListItem("Green", "Green"));
    p_status.Items.Add(new ListItem("Yellow", "Yellow"));
    p_status.Items.Add(new ListItem("Red", "Red"));
    //myProgram.Status = "Red";
    p_status.SelectedValue = myProgram.Status;

    }
    catch (Exception ex)
    {
    Response.Write(ex);
    Label1.Text = ex.ToString();

    }

}


Whoops...missed a little someting.. my bad

when asp.net is not behaving as expected this is your best friend: MSDN: ASP.NET PAGE LIFECYLE

Upon Further Review...

there are a couple of problems here. your drop down list control with an id of "p_status" is contained inside a multiview (I forgot about what that meant...) you need to move the code to populate p_status into pre-render after checking to see if Multiveiw1.ActiveView = View2. Since it will always be a post back you need to bind values late in the page cycle

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