AG Grid: Better way for validation row - valueSetter?

Question

Is there a better way to validate a row in ag-grid than with valueSetter?

I can achieve the validation with that but I am not sure, if ther

Answer 1

You could override the valueSetter and call the grid api transaction update instead.

Here is pseudo-code that shows how you could implement this.

valueSetter: params => {
  validate(params.newValue, onSuccess, onFail);
  return false;
};

validate = (newvalue, success, fail) => {
  if (isValid(newValue)) {
    success();
  } else {
    fail();
  }
};

onSuccess = () => {
  // do transaction update to update the cell with the new value
};

onFail = () => {
  // update some meta data property that highlights the cell signalling that the value has failed to validate
};

This way you can also do asynchronous validation. Here is a real example of an async value setter that has success, failure, and while validating handlers that do transaction updates when validation is done.

const asyncValidator = (
  newValue,
  validateFn,
  onWhileValidating,
  onSuccess,
  _onFail
) => {
  onWhileValidating();
  setTimeout(function() {
    if (validateFn(newValue)) {
      onSuccess();
    } else {
      _onFail();
    }
  }, 1000);
};

const _onWhileValidating = params => () => {
  let data = params.data;
  let field = params.colDef.field;

  data[field] = {
    ...data[field],
    isValidating: true
  };
  params.api.applyTransaction({ update: [data] });
};

const _onSuccess = params => () => {
  let data = params.data;
  let field = params.colDef.field;

  data[field] = {
    ...data[field],
    isValidating: false,
    lastValidation: true,
    value: params.newValue
  };
  params.api.applyTransaction({ update: [data] });
};

const _onFail = params => () => {
  let data = params.data;
  let field = params.colDef.field;

  data[field] = {
    ...data[field],
    isValidating: false,
    lastValidation: params.newValue
  };
  params.api.applyTransaction({ update: [data] });
};

const asyncValidateValueSetter = validateFn => params => {
  asyncValidator(
    params.newValue,
    validateFn,
    _onWhileValidating(params),
    _onSuccess(params),
    _onFail(params)
  );
  return false;
};

Here is a code runner example showing this in action: https://stackblitz.com/edit/async-validation-ag-grid-final