problem re populating/ resetting multiple comboboxes

[newguy]

Hi guys,

I have 5 Comboboxes, 1 main comboBox (Account) 3 additional ComboBoxes and 1 comboBox with a treeview that gets populated depending on the selected Value from the Main ComboBox. .

What is supposed to be happening is when i change select a new value from the Main comboBox all the other ones should be re populated with new data or cleared.

here is an example of how i am clearing the comboBoxes that depend on the Main one.

protected void cboAccount_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
        {
            RadComboBox cboSite = (RadComboBox)fvIncidentEdit.FindControl("cboSite");
            RadTreeView trvSite = ((RadTreeView)cboSite.Controls[2].FindControl("trvSite"));
            trvSite.DataSource = Models.Site.LoadActiveSites(Convert.ToInt32(e.Value));
            trvSite.DataBind();
            trvSite.UnselectAllNodes();

            cboSite.Text = string.Empty;
            cboSite.SelectedIndex = -1;

            PopulateSiteDependants();
        }

protected void PopulateSiteDependants()
        {
            RadTreeView trvSite = new RadTreeView();
            RadComboBox cboSite = (RadComboBox)fvIncidentEdit.FindControl("cboSite");
            if (cboSite.Controls[2].FindControl("trvSite") != null)
            {
                trvSite = ((RadTreeView)cboSite.Controls[2].FindControl("trvSite"));

                RadTreeView trvLocation = new RadTreeView();
                RadComboBox cboLocation = (RadComboBox)fvIncidentEdit.FindControl("cboLocation");
                if (cboLocation.Controls[2].FindControl("trvLocation") != null)
                {
                    if (trvSite.SelectedNode != null)
                    {
                        trvLocation = ((RadTreeView)cboLocation.Controls[2].FindControl("trvLocation"));
                        trvLocation.DataSource = Models.Location.LoadActiveLocations(Convert.ToInt32(trvSite.SelectedNode.Value));
                        trvLocation.DataBind();
                        trvLocation.UnselectAllNodes();
                    }
                    else
                    {
                        trvLocation.DataSource = null;
                    }

                    cboLocation.Text = string.Empty;
                    cboLocation.SelectedIndex = -1;
                }

                RadTreeView trvDepartment = new RadTreeView();
                RadComboBox cboDepartment = (RadComboBox)fvIncidentEdit.FindControl("cboDepartment");
                if (cboDepartment.Controls[2].FindControl("trvDepartment") != null)
                {
                    if (trvSite.SelectedNode != null)
                    {
                        trvDepartment = ((RadTreeView)cboDepartment.Controls[2].FindControl("trvDepartment"));
                        trvDepartment.DataSource = Models.Department.LoadActiveDepartments(Convert.ToInt32(trvSite.SelectedNode.Value));
                        trvDepartment.DataBind();
                        trvDepartment.UnselectAllNodes();
                    }
                    else
                    {
                        trvDepartment.DataSource = null;
                    }

                    cboDepartment.Text = string.Empty;
                    cboDepartment.SelectedIndex = -1;
                }
            }
            LoadCategories();

        }

        protected void LoadCategories()
        {
            RadTreeView trvDepartment = new RadTreeView();
            RadComboBox cboDepartment = (RadComboBox)fvIncidentEdit.FindControl("cboDepartment");
            if (cboDepartment.Controls[2].FindControl("trvDepartment") != null)
            {
                trvDepartment = ((RadTreeView)cboDepartment.Controls[2].FindControl("trvDepartment"));

                RadComboBox cboCategory = (RadComboBox)fvIncidentEdit.FindControl("cboCategory");
                RadTreeView trvCategory = (RadTreeView)cboCategory.Controls[2].FindControl("trvCategory");
                if (trvDepartment.SelectedNode != null)
                {
                    trvCategory.DataSource = Models.QuestionCategoryNode.LoadActiveQuestionCategoryNodes(Convert.ToInt32(trvDepartment.SelectedNode.Value));
                }
                else
                {
                    trvCategory.DataSource =Models.QuestionCategoryNode.LoadActiveQuestionCategoryNodes();
                }
                trvCategory.DataBind();
                trvCategory.UnselectAllNodes();

                cboCategory.Text = string.Empty;
                cboCategory.SelectedIndex = -1;
            }
        }

The only ComboBox that is giving me issues is the Category ComboBox, Please could someone explain the best way to clear / re populate a comboBox if the Main ComboBoxes value is changed.

Let me explain this properly.

The selection From ComboBox 1 Will populate comboBox 2.
When a selection from comboBox 2 is made, that will clear ComboBox 3 and 4 and will then populate ComboBox 3 and 4 with new data.
When a selection from comboBox 3 is made, that will clear ComboBox 5 and will then populate ComboBox 5 with new data.

The Above works but changing the Selected Value in the first comboBox  (account) will only Reset the 2nd ComboBox and not the rest.

So By selecting a new value From the 1st ComboBox that should reset comboBoxes 2-5 to an empty value.

[Nencho]

Hello John,

I would suggest you to use the approach, demonstrated in this help article. If you still facing any issues, achieving the desired behavior, I would like to ask you to provide us with the configuration of the RadComboBoxes that you use at your side.

Regards,
Nencho
Telerik