Trouble getting selected value from DropDownList when posted back
I have a DropDownList inside a Repeater with AutoPostBack=True. I need to get the selectedvalue of the DropDownList so that I can populate another DropDownList based on its value. I was trying to do this in the Page_Load method but the value is coming back as null. Here's what I was trying. What am I doing wrong?
Thanks
<asp:DropDownList ID="OfficeDDL" runat="server" AutoPostBack="true" /><br />if (Page.IsPostBack) { DropDownList OfficeDDL = (DropDownList)EmployeeOfficeAddressRepeater.FindControl("OfficeDDL"); string sValue = OfficeDDL.SelectedValue.ToString(); Trace.Warn(sValue); }
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rkeslar
2/4/2009 9:37:55 PM
asp.net.web-forms
93655 articles. 
6 followers.
4 Replies
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It's to early for you to access the control that's inside a databaound control at Page_Load event because the Repeater is not bounded yet.. Use ItemDataBound event instead when referencing a control that resides within a Repeater something like:
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e) { if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item) { DropDownList ddl = (DropDownList)e.Item.FindControl("DropDownList1"); if (ddl != null) { //do something } } }
Regards,Vinz
"Code, Beer and Music" that's my way of being a programmer!
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vinz
2/4/2009 10:17:52 PM
vinz:
It's to early for you to access the control that's inside a databaound control at Page_Load event because the Repeater is not bounded yet.. Use ItemDataBound event instead when referencing a control that resides within a Repeater something like:
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e) { if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item) { DropDownList ddl = (DropDownList)e.Item.FindControl("DropDownList1"); if (ddl != null) { //do something } } }
Well execution made it there and my dropdownlist wasnt null but when I tried to trace the selectedvalue I got an empty string.
But even when the page loads the first time theres an empty string as the value. I need to pass this value to another method though and I cant figure out why it's and emptry string.
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rkeslar
2/4/2009 10:44:49 PM
Hi rkeslar,
The following is cascading DropDownList controls inside the gridview.
Here is the link, please read it.
http://www.mikepope.com/blog/displayblog.aspx?permalink=1708
Sincerely,
Hua Jun Li
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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Hua
2/9/2009 6:52:01 AM
I wonder if when we declare one dropdownlist as another whether we inherit the properties like selectedValue as well.
Bind GridView to Dynamically created DataTable | Bind DataTable to DropDownList
My Blog
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shahed
2/9/2009 7:27:17 AM
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