how to manually validate a devextreme form items in a validation group in javascript.

Hi DevExpress Support,

I have a scenario where in I have a devextreme form shown below

HTML
<fieldset>  
                                        @(Html.DevExtreme().Form()  
                                          .FormData(Model)  
                                          .LabelLocation(FormLabelLocation.Top)  
                                          .Items(items =>  
                                          {  
                                              items.AddSimple()  
                                                   .DataField("Name")  
                                                   .Editor(e => e.TextBox().ID("create-role-name-text-box").OnInput("onRoleNameInputChanged"))  
                                                   .IsRequired(true);  

                                              items.AddSimple()  
                                                   .DataField("Description")  
                                                   .IsRequired(true);  
                                          })  
                                          .ValidationGroup("roleDetailsValidationGroup")  
                                        )  
                                    </fieldset>  

and I need to perform the validation manually in javascript when a button is clicked, just want to ask on how to best solve this problem.

Thanks!
Jude Alquiza.