private void EnsureDDLHasValues(CascadingLookupFieldControl field)
{
try
{
field.ClearError();
int minItems = 0;
try
{
minItems = (Convert.ToBoolean(field.strDefineNone)) ? 1 : 0;
}
catch
{
}
if (field.ddlCLField.Items.Count <= minItems)
{
throw new Exception("No lookup results present.");
}
}
catch (Exception ex)
{
field.ReportError(ex, "");
}
}
void UpdateChildren(string ChildrenField)
{
string[] children = ChildrenField.Split(new string[] { "] " }, StringSplitOptions.RemoveEmptyEntries);
Control control;
foreach (string child in children)
{
control = FindControlRecursive(this.Page, child);
if (control != null)
{
CascadingLookupFieldControl childField = (CascadingLookupFieldControl)control.Parent.Parent;
if (childField != null)
{
control = FindControlRecursive(this.Page, childField.strFilterValueField);
if (control != null)
{
DropDownList ddlFilterValueField = (DropDownList)control;
PopulateChild(childField, ddlFilterValueField.SelectedValue);
if (!string.IsNullOrEmpty(childField.strChildrenField))
{
UpdateChildren(childField.strChildrenField);
}
}
}
}
}
}
void PopulateChild(CascadingLookupFieldControl field, string filterValue)
{
SPQuery query = BuildQuery(field.strField, field.strParentField, field.strFilterValueField, filterValue);
SPListItemCollection queryResults = ExecuteQuery(field.strUrl, field.strList, field.strField, query);
if (queryResults != null)
{
BindDDL(field, queryResults.GetDataTable(), field.strField);
}
}
private void BindDDL(CascadingLookupFieldControl field, DataTable dtItems, string FieldName)
{
InitializeDDL(field.ddlCLField, field.strDefineNone);
if (dtItems != null)
{
DataTable dtResults = dtItems.DefaultView.ToTable(true, FieldName);
BindDDL(field, dtResults.Select(), FieldName);
}
EnsureDDLHasValues(field);
}
private void BindDDL(CascadingLookupFieldControl field, DataRow[] drRows, string FieldName)
{
InitializeDDL(field.ddlCLField, field.strDefineNone);
if (drRows != null)
{
foreach (DataRow dr in drRows)
{
if (field.ddlCLField.Items.FindByValue(dr[FieldName].ToString()) == null)
{
field.ddlCLField.Items.Add(new ListItem(dr[FieldName].ToString(), dr[FieldName].ToString()));
}
}
}
EnsureDDLHasValues(field);
}