for example category is an ddl
<asp
ropDownList ID="DdlCategoryName"
'Object data source DataSourceID="OdsCategoryNames"
DataTextField="categoryname"
DataValueField="category"
runat="server">
<asp:ListItem />
</asp
ropDownList>
-------------
<asp:ListItem/> creates one blank, if specify any item in list just specify that with in listitem tag
Bill Gower wrote:
ObjectDataSource and DropDownList
30-Jul-07
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 trie
CategoryList.SelectedIndex = -
an
CategoryList.SelectedValue = "
Neither clears out the list. How do I display a blank
Bill
Previous Posts In This Thread:
ObjectDataSource 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 trie
CategoryList.SelectedIndex = -
an
CategoryList.SelectedValue = "
Neither clears out the list. How do I display a blank
Bill
Re: ObjectDataSource and DropDownList
* Bill Gower wrote, On 31-7-2007 0:06
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?
Do you mean in the Page Load event?
Re: ObjectDataSource and DropDownList
* Bill Gower wrote, On 31-7-2007 1:17
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
If you can't use the designer (either because you are using nested master
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
ropDownList DataSourceID="MyDataSource" AppendDataBoundItems="true"
<asp:ListItem Value="" Text="" /
</asp
ropDownList
Thanks that really helped.
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
Bil
Try to manually add Text="" in the aspx.
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.
Re: ObjectDataSource and DropDownList
* Bill Gower wrote, On 31-7-2007 4:51:
I the past I have used as the text field. Not completely empty, but
it does the trick from a users perspective.
Jesse
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