Hello Hristo,

I hope you can help me with one more question on this. I've gotten the dropdowns to work correctly to show the unique data for each row. The issue now becomes that whenever attempting to select an item from the dropdown a postback is triggered and the DataGrid goes through another DataBinding and the selected value of the DropDown is effectively lost. For instance in the example you provided when I select "Data 1" after the post back the text/value for the field is still "Pat" although the dropdown will correctly display "Data 1".

Is there any way to keep this information through postback so that a user can select several different dropdowns and eventually click a button to save the values selected to a Database?

Just let me know if you need any clarification or if you have any advice on this.

Thanks so much.

That's fine, you can update the thread whenever you are up to this.

Thanks so much Hristo - I'll take a look at this today and tomorrow and see if I have any other issue that needs to be cleared up.

Hi Marcelo,

Thank you for your further explanations. There is no need to use a unique DropDown for each row. It is enough to have the same DropDown and populate it with differewnt data for each row. To achieve this we make use of the following workflow:

 1) Attach to the cellEditing_EnteringEditMode, this will fire when you try to edit a cell

          <CellEditingClientEvents EnteringEditMode="WebHierarchicalDataGrid1_CellEditing_EnteringEditMode" />

2) In the event handler of cellEditing_EnteringEditMode we call the loadItems method of the dropdown:

        function WebHierarchicalDataGrid1_CellEditing_EnteringEditMode(sender, eventArgs)
        {
            if (eventArgs.getCell().get_column().get_key() === "Patient First Name") {
                var dropdowneditor2 = ig_controls.ddeditor2;
                var rowIndex =  eventArgs.getCell().get_row().get_index();
                dropdowneditor2.loadItems(rowIndex, false);
            }
        }

As you see we pass a parameter to the method, in this case the rowIndex, so we can build a logic around that. You can pass any value.

3) Calling loadItems will trigger the server event ItemsRequested, that we need to attach to:

                    <EditorControl ID="ddeditor2" ClientIDMode="Static" Width="200px"
                          OnItemsRequested="ddeditor2_ItemsRequested" DropDownContainerMaxHeight="200px" EnableAnimations="False" EnableDropDownAsChild="False">
                        <ClientEvents DropDownOpening="WebHierarchicalDataGrid1_DropDown_DropDownOpening" />
                    </EditorControl>

As you see below we can make use of the rowIndex for any logic,. in this case we populate the dropdown with different date based on that.

    protected void ddeditor2_ItemsRequested(object sender, EventArgs e)
    {
        int rowIndex = Int32.Parse(((Infragistics.Web.UI.ListControls.DropDownItemsRequestedEventArgs)e).Value.ToString());
      
        // query your database using the rowIndex value, or assign datasource, or filter current dataSource, etc
        this.dd2.EditorControl.DataSource = MakeTable(rowIndex);
        this.dd2.EditorControl.ValueField = "id";
        this.dd2.EditorControl.TextField = "Data";
        this.dd2.EditorControl.DataBind();

    }
}

I am also attaching the sample for your reference. It makes use of the WebHierarchicalDataGrid, but the approach has NO different with a flat WebDataGris control. The dropdown is in the last column of the grid.

Hi Hristo,

This example makes is very good but my issue is that for each row the DropDown will need to contain unique values depending on the Item. Is the only way to do this to add a Unique DropDownProvider for each Row?

The following would be an example (adapted from your example and the following does not work but would love to figure out how it can) -- I need a situation where if WebDataGrid is populated by "MakeTable_2" and in MakeTable_2 if "MakeTable" is passed the Value "1" then the dropdown for that Row with have 20 values "Data 0" to "Data 19" and if "MakeTable" is passed the value "2" then that row would have a drop down with only "Data 0" to "Data 5"

Does this issue make sense? is there a way to do this programmatically/on the server side? Do I just need to make unique DropDownProviders for each row?

public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

        this.WebDataGrid1.DataSource = MakeTable_2();
    }

    private DataTable MakeTable(int x)
    {
        // Create a new DataTable.
        System.Data.DataTable table = new DataTable("Table");
        // Declare variables for DataColumn and DataRow objects.
        DataColumn column;
        DataRow row;

        // Create new DataColumn, set DataType,
        // ColumnName and add to DataTable.    
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "id";
        column.ReadOnly = true;
        // Add the Column to the DataColumnCollection.
        table.Columns.Add(column);

        // Create second column.
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "Item";
        column.AutoIncrement = false;
        column.Caption = "Item";
        column.ReadOnly = false;
        column.Unique = false;
        // Add the column to the table.
        table.Columns.Add(column);

        // Create third column.
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "Data";
        column.AutoIncrement = false;
        column.Caption = "Data";
        column.ReadOnly = false;
        column.Unique = false;
        // Add the column to the table.
        table.Columns.Add(column);

        // Make the ID column the primary key column.
        DataColumn[] PrimaryKeyColumns = new DataColumn[1];
        PrimaryKeyColumns[0] = table.Columns["id"];
        table.PrimaryKey = PrimaryKeyColumns;

        if (x == 1)
        {
            for (int i = 0; i <= 20; i++)
            {
                row = table.NewRow();
                row["id"] = i;
                row["Item"] = i;
                row["Data"] = "Data " + i;
                table.Rows.Add(row);
            }
        }
        if (x == 2)
        {
            for (int i = 0; i <= 5; i++)
            {
                row = table.NewRow();
                row["id"] = i;
                row["Item"] = i;
                row["Data"] = "Data " + i;
                table.Rows.Add(row);
            }
        }
        
        return table;
    }
    private DataTable MakeTable_2()
    {
        // Create a new DataTable.
        System.Data.DataTable table = new DataTable("Table");
        // Declare variables for DataColumn and DataRow objects.
        DataColumn column;
        DataRow row;
        DataRow row2;
        // Create new DataColumn, set DataType,
        // ColumnName and add to DataTable.    
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "id";
        column.ReadOnly = true;
        // Add the Column to the DataColumnCollection.
        table.Columns.Add(column);

        // Create second column.
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "Item";
        column.AutoIncrement = false;
        column.Caption = "Item";
        column.ReadOnly = false;
        column.Unique = false;
        // Add the column to the table.
        table.Columns.Add(column);

        // Create third column.
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "Data";
        column.AutoIncrement = false;
        column.Caption = "Data";
        column.ReadOnly = false;
        column.Unique = false;
        // Add the column to the table.
        table.Columns.Add(column);

        // Make the ID column the primary key column.
        DataColumn[] PrimaryKeyColumns = new DataColumn[1];
        PrimaryKeyColumns[0] = table.Columns["id"];
        table.PrimaryKey = PrimaryKeyColumns;

        row = table.NewRow();
        row["id"] = 1;
        row["Item"] = "This is Item 1";
        row["Data"] = "Select...";

        DropDownProvider dropdownprovider = (DropDownProvider)WebDataGrid1.EditorProviders["DropDownProvider1"];
        dropdownprovider.EditorControl.DataSource = MakeTable(1);

        table.Rows.Add(row);

        row2 = table.NewRow();
        row2["id"] = 2;
        row2["Item"] = "This is Item 2";
        row2["Data"] = "Select...";

        dropdownprovider = (DropDownProvider)WebDataGrid1.EditorProviders["DropDownProvider1"];
        dropdownprovider.EditorControl.DataSource = MakeTable(2);

        table.Rows.Add(row2);
        
        return table;
    }

}

Thanks so much.