It still doesn't work correctly.  Here's my code:

 <form id="form1" runat="server">
    <div>
      <asp:ScriptManager ID="ScriptManager1" runat="server">
      </asp:ScriptManager>
      <ig:WebDropDown ID="WebDropDown1" runat="server" Width="200px"  TextField="Prod_Code" ValueField="Prod_ID"
        AutoSelectOnMatch="false"  EnableAutoFiltering="Client"
        OnSelectionChanged="WebDropDown1_SelectionChanged"
        DataSourceID="SqlDataSource1">
        <AutoPostBackFlags SelectionChanged="On" ValueChanged="Off" />
      </ig:WebDropDown>
   
      <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:TravelerMakerGUIConnectionStringXXXX %>"
        SelectCommand="SELECT [Prod_Code], [Prod_ID] FROM [ProductCodes]">
      </asp:SqlDataSource>
   
    </div>
    </form>


The desired behavior is: A postback should only happen when:
1) an item is selected with the mouse (this works)
2) Only when the <enter> key is hit (not working) - postpacks also happen at other times.

If the list is a bunch of part numbers like:
abc-123
abc-124
abc-125
def-123
def-124

Now, using my code and part numbers from above, select abc-124 with the mouse.  a postback happens - this is correct.

Now, pretend that you made a mistake, and you really wanted one of the def-123 parts.  So, rather than use the mouse, you highlight the abc-123 item, and start typing 'D'.....     A postback happens.   I did not select a full partnumber, I just typed a 'D', and a postback happened.  This postback should not happen, I did not select a part number.   

A postback should only happen if an item is selected with the mouse, or if I hit the <enter> key. 

Thanks, Jim

Hello Jim,

Thank you for the detailed descriprion of your Use case.

I think that the below configuration of WebDropDown  matches your requirements:

<ig:WebDropDown ID="WebDropDown1" runat="server" Width="200px" TextField="LastName"

            ValueField="EmployeeID" DataSourceID="SqlDataSource1" AutoSelectOnMatch="false"

            EnableClosingDropDownOnSelect="false" EnableAutoCompleteFirstMatch="false"

            KeepFocusOnSelection="false" EnableAutoFiltering="Client" OnSelectionChanged="WebDropDown1_SelectionChanged">

            <AutoPostBackFlags SelectionChanged="On" ValueChanged="Off" />

            <DropDownItemBinding TextField="LastName" ValueField="EmployeeID" />

        </ig:WebDropDown>

Just to let you know that I am using the latest service release of 10.3 version (10.3.20103.2056)

Also keep in mind that WebDropDown supports keyboard navigation and if you use Up/Down arrow keys the items will be selected.

Hope this helps.

Yes, I'm using the latest service pack.

You had me add two tags (EnableClosingDropDownOnSelect="false" EnableAutoCompleteFirstMatch="false")

This did not help.  Again, the problem is simple to see:
1) After the page loads, Select an item with the mouse (any item).  A postback happens, this is correct.
2) Now, HIGHLIGHT the text which is the item that you just selected above.  Hit any other key on the keyboard.  A postback will happen.  This is NOT correct.  I did not select a different item yet, All I did was hit the first character of my new choice.

Jim

I am having an exact same issue with you. Did Ingragistics ever solve this issue?

This behavior has been registered as a bug #83565, the resolution for it will be included in the next SR.