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Bubble Event for obtaining dropdownlist index change in a formview insert template

Posted on 2006-10-20
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Last Modified: 2012-08-14
I have a FormView "FormView1" which contains a drop down list "dropdownlist1" in the insert template.  I need to be able to get the value when the selected index is changed in the drop down list.  I understand this is done using bubble events.  How do I do this in c#?
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Question by:dodgybouy
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LVL 7

Expert Comment

by:here4u247
ID: 17772370
you set the selected indexchanged event to the dropdown which calls an event handler everytime the selection change i.e.

                 <asp:DropDownList AutoPostBack="True" ID="DropDownList1" runat="server"
                         OnSelectedIndexChanged="DeliveryIDDropDownList_SelectedIndexChanged">
                         <asp:ListItem>1</asp:ListItem>
                         <asp:ListItem>2</asp:ListItem>
                    </asp:DropDownList

C# event handler:


    protected void DeliveryIDDropDownList_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList ddlDel = (DropDownList)sender;
//Do stuff
    }

Hope that helps
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Author Comment

by:dodgybouy
ID: 17773438
This is helpful and has got me half way to solving the problem.  However when I use this code the action only triggers after the command event is triggered by the template (i.e. somebody clicking the update or cancel button).  what is require is for the event to trigger when the selected index changes on the drop down list.  

To do this I understand you have to use a bubble event to trigger the templates command event when the selected index change event fires within the template.  Do you know how to do this?
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LVL 7

Expert Comment

by:here4u247
ID: 17774097
where did you put the dropdownlist, insertTemplate/EditTemplate or somewhere else? because i use formview with databound dropdownlist and i can fire selected index change event properly...

can you show us your code?
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Author Comment

by:dodgybouy
ID: 17774131
I put the dropdownlist in an edit template,

aspx file

<asp:FormView ID="FormView1" runat="server" DataKeyNames="ID"
        DataSourceID="SqlDataSource2" DefaultMode="Edit" Visible="False"
        OnItemUpdated="FvComment_Updated" OnItemUpdating="FvComment_Updating" OnItemCommand="FvComment_Command">
            <HeaderTemplate>
                <strong>Comment</strong>
            </HeaderTemplate>
            <EditItemTemplate>
                <strong>Select Comment:</strong>
                <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="sqlDSGetComment"
                    DataTextField="Comment"  OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
                    DataValueField="CommentID" SelectedValue='<%# Bind("CommentID") %>'>
                </asp:DropDownList><asp:SqlDataSource ID="sqlDSGetComment" runat="server" ConnectionString="<%$ ConnectionStrings:AngusConnectionString %>"
                    SelectCommand="spGetCommentType" SelectCommandType="StoredProcedure"></asp:SqlDataSource>
                <br />
                <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
                    Text="Update" OnClientClick="return confirm('Are you sure that you want to update this comment, all current data will be lost?');" >

                </asp:LinkButton>
                <asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                    Text="Cancel">
                </asp:LinkButton>
            </EditItemTemplate>

Code behind file

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            DropDownList ddl1 = (DropDownList)sender;

            Response.Write(ddl1.SelectedValue.ToString());
        }
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Accepted Solution

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here4u247 earned 500 total points
ID: 17774268
ahaa i see, what you need is AutoPostBack="True" i.e.

<asp:DropDownList ID="DropDownList1" AutoPostBack="True"   runat="server" DataSourceID="sqlDSGetComment"
                    DataTextField="Comment"  OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
                    DataValueField="CommentID" SelectedValue='<%# Bind("CommentID") %>'>

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