how to set selectedindex

bmains · August 16th, 2004, 07:54 AM

Hey,

I think you have to reference the specific cell, as such:

((DropDownList)e.Item.Cells[<cellindex>].FindControl("DropDownList1")).SelectedIndex=newval ue;

Brian

mehdi62b · August 16th, 2004, 09:31 AM

Brian,I dont think it makes any sense
dear Azita, if you tell us more about your scenario we could help you much more
(I think your problem is due to binding your DropDownList and DataList)
can u tell me when you bind your DropDownList(it should be after binding DataList)?
also before Binding your DropDownList you should determine or change
your SelectedIndex(through an integer static variable
could be changed everywhere u need like ItemCommand event )
Hope this helps.

--------------------------------------------
Mehdi.:)

bmains · August 16th, 2004, 10:15 AM

Hello,

You are right, that is for a DataGrid. Sorry for any confusion.

Brian

larrelscott · September 15th, 2004, 03:56 PM

I am new to .NET and I am still having trouble with this the topic in this post. I am trying to set the value of the dropdownlist to match the database value when I move to edit mode in the datagrid. Some of this code may be unecessary but I'm not sure what would be. I have been trying everything to get this too work with a lot of different approaches being recommended by many different forums. Sorry if it is ugly. I am getting a message that says, "Object reference not set to an instance of an object."

Here is the code I have in the DataGrid1_EditCommand method.
this.sqlConnection1.Open();
this.sqlDataAdapter1.Fill(recordValuesDataSet11);
this.sqlConnection1.Close();
DataGrid1.EditItemIndex = e.Item.ItemIndex;
this.DataGrid1.DataBind();
((DropDownList)e.Item.Cells[6].FindControl ("statusddl")).SelectedIndex = e.Item.Cells[6].Text;

Thanks in advance for any help you can give.

planoie · September 16th, 2004, 02:17 PM

Which line is that error occuring on?

I see the call to bind the datagrid, but I don't see anything that is setting the grid's datasource. I assume that you have some code somewhere that is setting up the grid's datasource that gets executed on page load. You need to call this code again when you re-bind the grid. After the page postback to change a row into edit mode, the only data that still exists is the data in the grid's viewstate and this is not enough to rebind the grid.

mehdi62b · September 16th, 2004, 06:21 PM

Hello,
if you dont have any problem with your Connection object your problem is due to
binding your grid,for preventing this error you should bind your DropDownList and DataGrid
like below order,
1-first bind your datagrid(before it,set its datasource)
2-then bind again your DropDownList(before it,set its datasource)
for example somewhere like ItemDataBound event could be a good place for binding DropDownList
meanwhile,its better to use this line in your code,

Code:

if (e.Item.ItemType == ListItemType.Item ||
                e.Item.ItemType == ListItemType.AlternatingItem ||
                e.Item.ItemType == ListItemType.SelectedItem ||
                e.Item.ItemType == ListItemType.EditItem)
{   
((DropDownList)e.Item.FindControl ("statusddl")).SelectedIndex = anIntegerVariable;
}

you should put your find method in if-statement for avoiding that error.
HtH.

--------------------------------------------
Mehdi.:)

jlh42581 · December 1st, 2006, 02:25 PM

You guys are adding an extra step.

Use the .length property and you dont need to subtract one, because it knows, that an array starts at zero.

        for(var i=0;i<avail_options.length;i++){
            if(avail_options.options[i].value == current_season){
                avail_options.options[i].selected = true;
            }
        }