custom valdators async condition function

[eakduman]

hello,
I have defined a "promise" and a "async function" as follows.

function getCategoryType(categoryTypeID) {
        return new Promise(resolve => {           
            dsCategoryTypes.fetchData({ categoryTypeID: categoryTypeID, recordNumber: 1 }, function (dsResponse, data, dsRequest) {
                resolve(data[0] || null);
            });             
        });
    }
    async function categoryTypeIsValid(item, validator, value, record) {
        var categoryType = await getCategoryType(record.categoryTypeID || null);
        if (categoryTypeID) {
            if (categoryTypeID.required === 1 && !value )
                return false;
        } 
        return true;                
    }

I made the fields validator definitions with await as follows.

isc.ListGrid.create({
fields: [
{name: "categoryType", type: "text", title: "Category Type" },
  {name: "documentNumber", title: "Document Number", type: "text",
        validators: [                                 
                    {
                        type: "custom", errorMessage: "Document number is required",
                        // when use async, validator don't work correctly
                        condition: async function (item, validator, value, record) {
                            var result =  await CategoryTypeIsValid(item, validator, value, record);
                            return result; 
                        }
                    }
                ]
            }
]
});

The validation does not work correctly when using async property.
How can I fix this issue?

[Isomorphic]

Use a serverCustom validator since the reason you need to go async is to go to the server.