Dynamic Listbox in Gridview

[MikeB]

Hello All,

I know this has to be something simple but I have having a hard time finding
examples. I need to add a dynamic listbox to a gridview.

For example, my grid view displays categories and then in each row/ category
I have a list box that displays items in the category.

Can anyone give any pointers or examples?

 

[Mark Rae]

Can anyone give any pointers or examples?

Google is your friend:
http://www.google.co.uk/search?sour...=GGLG,GGLG:2006-28,GGLG:en&q=GridView+ListBox

 

[MikeB]

Thank you, I have been searching on the wrong terms.

 

[MikeB]

New question, my dropdown list will not load with the data. I am setting
the object datasouce with the below code howver, it isn't working (I debuged
though it and it is being called correctly).

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

ObjectDataSource ds =
(ObjectDataSource)e.Row.FindControl("ObjectDataSource2");

ds.SelectParameters["categoryID"].DefaultValue =
GridView1.DataKeys[e.Row.DataItemIndex].Value.ToString();



}

}

 

[Mark Rae]

New question, my dropdown list will not load with the data. I am setting
the object datasouce with the below code howver, it isn't working (I
debuged though it and it is being called correctly).

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs
e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

ObjectDataSource ds =
(ObjectDataSource)e.Row.FindControl("ObjectDataSource2");

ds.SelectParameters["categoryID"].DefaultValue =
GridView1.DataKeys[e.Row.DataItemIndex].Value.ToString();

It doesn't appear as if you're actually binding the datasource to the
DropDownList...

Something like:

DropDownList ddl = e.Row.Cells[...].FindControl("...");
ddl.DataSource = ds;
ddl.DataBind();

You'll also need to specify which field in your datasource is the value and
which the text of each of the ListItems in your DropDownList...

 

[MikeB]

I am having one of those days. Thank you again.

New question, my dropdown list will not load with the data. I am
setting the object datasouce with the below code howver, it isn't working
(I debuged though it and it is being called correctly).

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs
e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

ObjectDataSource ds =
(ObjectDataSource)e.Row.FindControl("ObjectDataSource2");

ds.SelectParameters["categoryID"].DefaultValue =
GridView1.DataKeys[e.Row.DataItemIndex].Value.ToString();

It doesn't appear as if you're actually binding the datasource to the
DropDownList...

Something like:

DropDownList ddl = e.Row.Cells[...].FindControl("...");
ddl.DataSource = ds;
ddl.DataBind();

You'll also need to specify which field in your datasource is the value
and which the text of each of the ListItems in your DropDownList...

 

[Charles]

One error I found in the code sample was:

ds.SelectParameters["categoryID"].DefaultValue =
GridView1.DataKeys[e.Row.DataItemIndex].Value.ToString();

Should be:

ds.SelectParameters["categoryID"].DefaultValue =
GridView1.DataKeys[e.Row.RowIndex].Value.ToString();

I received an error when I had paging enabled, the e.Row.DataItemIndex would be an invalid number (#11 in a 10 row GridView). e.Row.RowIndex on the other hand gives you the current row #.

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