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.NET Forum / ASP.NET / General / July 2007ObjectDataSource and DropDownList
I have a asp.net page that has a DDL tied to a ObjectDataSource. I want the DDL to display a blank in the list when the page is first displayed and let the user select the entry they want. I have tried CategoryList.SelectedIndex = -1 and CategoryList.SelectedValue = "" Neither clears out the list. How do I display a blank? Bill * Bill Gower wrote, On 31-7-2007 0:06: > I have a asp.net page that has a DDL tied to a ObjectDataSource. I want the > DDL to display a blank in the list when the page is first displayed and let [quoted text clipped - 7 lines] > > Neither clears out the list. How do I display a blank? In the designer, add a blank item to the items list of the dropdown. Set the text to an empty string and the value to -1. Then look for a property that is called something like "AppendWhenDataBinding"... (The exact phrasing eludes me at this moment...) and set it true. Now that you have your blank element both your old statements should be able to set it to the empty line by default. Jesse Do you mean in the Page Load event? >* Bill Gower wrote, On 31-7-2007 0:06: >> I have a asp.net page that has a DDL tied to a ObjectDataSource. I want [quoted text clipped - 18 lines] > > Jesse * Bill Gower wrote, On 31-7-2007 1:17: > Do you mean in the Page Load event? No. Open the page with the dropdown in the designer. Look in the properties. There's an items property. Open the items property with the little [...] buton and click the add button. Give the thing a valeu of -1 and clear the text that's automatically put in there. Close the window and look for the AppendDataboundItems and set it to true. Now if you load the page, it has an empty item on top. There's no need to set it to the empty value, because the dropdown will always default to it's top-most item unless specified otherwise. Jesse >> * Bill Gower wrote, On 31-7-2007 0:06: >>> I have a asp.net page that has a DDL tied to a ObjectDataSource. I want [quoted text clipped - 17 lines] >> >> Jesse If you can't use the designer (either because you are using nested master pages or because you just can't stomach the output), you can do it in the aspx as follows: <asp:SqlDataSource ID="MyDataSource" ... /> <asp:DropDownList DataSourceID="MyDataSource" AppendDataBoundItems="true"> <asp:ListItem Value="" Text="" /> </asp:DropDownList> >* Bill Gower wrote, On 31-7-2007 1:17: >> Do you mean in the Page Load event? [quoted text clipped - 32 lines] >>> >>> Jesse Thanks that really helped. Just one problem to solve, even though I have deleted the Text value in the Items collection field, it still displays -1 in the drop down and I did check, I am displaying the proper field in the list. Bill >* Bill Gower wrote, On 31-7-2007 1:17: >> Do you mean in the Page Load event? [quoted text clipped - 32 lines] >>> >>> Jesse Try to manually add Text="" in the aspx. Clearing the value in the properties window probably removes the attribute from the control, which would result in the value being shown by default (-1 in this case). Another solution might be to use an empty value as well--unless your code specifically requires -1 for unselected ddl values. > Thanks that really helped. Just one problem to solve, even though I have > deleted the Text value in the Items collection field, it still displays -1 [quoted text clipped - 39 lines] >>>> >>>> Jesse * Bill Gower wrote, On 31-7-2007 4:51: > Thanks that really helped. Just one problem to solve, even though I have > deleted the Text value in the Items collection field, it still displays -1 > in the drop down and I did check, I am displaying the proper field in the > list. I the past I've used as the text field. Not completely empty, but it does the trick from a users perspective. Jesse >> * Bill Gower wrote, On 31-7-2007 1:17: >>> Do you mean in the Page Load event? [quoted text clipped - 31 lines] >>>> >>>> Jesse Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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