Async Ria Validation

[MiddleTommy]

I am doing an async validation when a property is changed. the validation happens but it is not reflected in the UI until the cell being validated is selected again after the async validation occurs. is there a way for the grid to keep track of the ValidationErrors collection in the Entity to update the UI? This is a SL 4 application

[MiddleTommy]

I read somewhere that Async DataValidation is not supported so I tried some things.

What I came up with was in the partial method of the ria services entity where the property is changed I add an error to the ValidationsErrors collection. Then when the property async passes validation I remove that error from the ValidationErrors collection.
Or if it fails I change the Error to be something else
It works for me.

 private MyCardsContext _vctx;
        private MyCardsContext vctx
        {
            get
            {
                if (_vctx == null)
                {
                    _vctx = new MyCardsContext();
                }
                return _vctx;
            }
        }
        private ValidationResult mtypeError;
        partial void  OntypeChanged()
        {
            var value = type;
            if(IsDeserializing)
                return;
            if(!value.IsEmpty())
            {
                mtypeError = new ValidationResult("Type is being checked", new[] { "type" });
                ValidationErrors.Add(mtypeError);


                vctx.FindMType(this.type, delegate(InvokeOperation<MType> io)
                                           {
                                               var mtype = io.Value;
                                               if (mtype == null)
                                               {
                                                   ValidationErrors.Remove(mtypeError);
                                                   mtypeError = new ValidationResult("type is invalid", new[] { "type" });
                                                   ValidationErrors.Add(mtypeError);
                                                   MType = null;
                                               }
                                               else
                                               {
                                                   ValidationErrors.Remove(mtypeError);

                                                   this.MType = mtype;
                                               }
                                           }, null);
            }
            else
                MType = null;

        }

the query I call is labeled with the invoke attribute in the DomainService

       [Invoke]
        public MType FindMType(string alias)
        {
            var type = alias;
            var aliases = GetMTypeAliases();
            var mt = from t in aliases
                     where t.type == type
                     select t.MType;

            //var mtypes = GetMTypes();
            //var mt = from t in mtypes
            //         where (from m in t.MTypeAliases where m.type == type select m.MTypeId).Contains(t.Id)
            //         select t;
            return mt.FirstOrDefault();
        }

[Vlad]

Hello,

We will do our best to include support for async validation unfortunately this will be most probably after Q2 2010 release - probably Sp1.

Kind regards,
Vlad
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

[MiddleTommy]

In the mean time is there an example or way to show cells with errors that are not being edited?
Say for instance you have a cell that when edited throws another cell in error.

[Nedyalko Nikolov]

Hi TWT,

I'm attaching a sample project that can give you an idea how to achieve this.
Important code is inside PersonValidator class (which handles data layer validation on a row level). Code inside RadGridView.RowValidated event handler just puts incorrect cell into edit mode.
I hope this will help.

Kind regards,
Nedyalko Nikolov
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.