React: this is null in event handler

Question

I have a LoginForm component. I want to check before submit, that both loginName and password is set. I tried with this code (a lot of stuff omitte

Answer 1

You need set this for submit method because now this is undefined, for this operation you can use .bind

onSubmit={ this.submit.bind(this) }

Example

or you can use arrow function

onSubmit={ (e) => this.submit(e) }

Example