onValidationError

fires when newly loaded/added/edited data fail to pass validation

function onValidationError(
    // the ID of the data item that is being validated
    id: number|string,
    // the data item object
    obj: object,
    // the validation result for data keys under validation
    details: object
): void

Example

webix.grid({
  rules:{
    title:webix.rules.isNotEmpty,
        rating:webix.rules.isNumber
  },
  on:{
    onValidationError:function(id, obj, details){
      var index = this.getIndexById(id)+1;
      console.log({ type:"error", text:"Empty title for row "+index });
    }
     }
});

also check the next samples:

• Validation with Message
• Validation with Complex Message

Details

The last parameter, details, contains invalid markers for each data key that has been validated and looks like:

{
  title:true,  // hasn't passed validation
  rating:false // has passed validation
}