getSetHelpers.md

get and set helpers

get and set

after extensive use i found the following syntax tedious (particularly because in react-formstate, nested form components should not manage their own state)

render() {
  if (this.formState.getFieldState('someField').getValue() === 'someValue') {
    // do something...
  }
  // ...
}

customHandler(e) {
  let context = this.formState.createUnitOfWork(),
    fieldState = context.getFieldState('someField');

  fieldState.setValue(e.target.value);
  // ...
}

so i added functions to streamline things a bit

render() {
  if (this.formState.get('someField') === 'someValue') {
    // do something...
  }
  // ...
}

customHandler(e) {
  let context = this.formState.createUnitOfWork(),
    fieldState = context.set('someField', e.target.value);

  // ...
}

getu

getu is an alternative that retrieves an uncoerced value.

when is this useful? for starters, see the react-datepicker example.

then, if you are using react-datepicker and injecting a model, you might have conditional logic in your render function like so

constructor(props) {
  super(props);
  this.formState = FormState.create(this);
  this.state = this.formState.injectModel(props.model);
}

render() {
  let yay = null, dateValue = this.formState.getu('someInjectedDate');
  if (dateValue && dateValue.date() === 1) {
    yay = "it's the first of the month!";
  }
  // ...
}