Custom validators and autogenerated edit form

[Kathy]

In the examples, all I see are edit item templates and validation on those fields in the template.  What about if you are using the autogenerated edit form?  Any examples like that?  Thanks.

[Shinu]

Hello Kathy,


The documentation shows how to add the validation controls in editform of RadGrid. I hope this helps.
Validation



-Shinu.

[Kathy]

I got the validators to work for the numeric columns.  But I'm having difficulty with the DateTimeColumn when using a DatePicker.  I have 2 date columns, start date and end date and all I need to do is make sure the end date is after the start date.  Here's what I have:

if (e.Item is GridEditableItem && e.Item.IsInEditMode)
            {

                GridEditableItem editedItem = e.Item as GridEditableItem;


                GridDateTimeColumnEditor editor = (GridDateTimeColumnEditor)editedItem.EditManager.GetColumnEditor("StartDate");
                RadDateInput cell = (RadDateInput)editor.PickerControl.DateInput;
                cell.ID = "startdateID";

                GridDateTimeColumnEditor editorend = (GridDateTimeColumnEditor)editedItem.EditManager.GetColumnEditor("EndDate");
                RadDateInput cellend = (RadDateInput)editorend.PickerControl.DateInput;
                cellend.ID = "enddateID";



                CompareValidator compValidate = new CompareValidator();
                compValidate.ControlToValidate = cell.ID;
                compValidate.ControlToCompare = cellend.ID;
                compValidate.Operator = ValidationCompareOperator.GreaterThan;
                compValidate.ErrorMessage = "EndDate should not be less than StartDate";
                cell.Controls.Add(compValidate);
                cellend.Controls.Add(compValidate);

But now, it says that it can't find the controls enddateID and startedateID.

[Vasil]

Hello Kathy,

This code should work for you:

protected void RadGrid1_ItemCreated(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {
        if (e.Item is GridEditableItem && e.Item.IsInEditMode)
        {
            GridEditableItem item = e.Item as GridEditableItem;

            GridDateTimeColumnEditor editorStartDate = (GridDateTimeColumnEditor)item.EditManager.GetColumnEditor("StartDate");
            GridDateTimeColumnEditor editorEndDate = (GridDateTimeColumnEditor)item.EditManager.GetColumnEditor("EndDate");

            TableCell cellStart = (TableCell)editorStartDate.PickerControl.Parent;
            CompareValidator compareValidator = new CompareValidator();
            compareValidator.ID = "compareValidator";
            compareValidator.ControlToValidate = editorStartDate.PickerControl.ID;
            compareValidator.ControlToCompare = editorEndDate.PickerControl.ID;
            compareValidator.Operator = ValidationCompareOperator.LessThan;
            compareValidator.Type = ValidationDataType.Date;
            compareValidator.ErrorMessage = "Start date must be before the end date!";
            cellStart.Controls.Add(compareValidator);
        }
    }

Information about how to add validators to RadGrid columns can be found in this help article and in the live demo here.

Sincerely yours,
Vasil
the Telerik team