introduce custom allowCreateRule

[damusnet]

Hello, and thanks for open sourcing such a useful a nicely done component.

We have a scenario in multi mode where a user can create a new tag, but only if it is a valid email address. I would like to introduce a new allowCreateRule props that expects a function which would trigger the Add "newTag"? prompt only when matched.

Are there already any similar plans? Is this something you would consider merging? Do you have any advice?

Thanks in advance for your feedback.

[damusnet]

Nevermind!

While trying to implement this allowCreateRule I realized it wasn't necessary and could be achieved with the current API. Here is my solution for reference:

  constructor(props) {
    super(props);
    this.state = {
      allowCreate: false,
    };
  }

  onInputChange(inputValue) {
    const re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    const allowCreate = re.test(inputValue);
    this.setState({
      allowCreate,
    });
  }

  render() {
    return (
      <Select
          multi
          allowCreate={this.state.allowCreate}
          onInputChange={this.onInputChange.bind(this)}
      />
    );
  }

Another testimony to how nice React - and this component - are 😃