Passing an event from onSubmit in React without using lambdas

Within our current project, the tslint rule jsx-no-lambda is in place.

When attempting to capture event from onSubmit, this is how I typically write my code:

public handleLogin = (event: React.FormEvent<HTMLFormElement>) => {
    event.preventDefault();
}

public render() {
    return(
        <form onSubmit={(event) => this.handleLogin(event)}>
            ...
}

To enhance readability, one way to address this is by eliminating the arrow function within the jsx like so:

<form onSubmit={this.handleLogin}

Looking for a more elegant solution specifically for indicating where event originates from in the line

<form onSubmit={this.handleLogin}
.

Furthermore, how can additional parameters be passed to handleLogin?

Answer №1

Indeed, once you have bound your function to the constructor in this manner:

constructor() {
  //other code
  this.handleLogin = this.handleLogin.bind(this);
}

You can then define your function as follows:

function handleLogin(e){
   e.preventDefault();
   // perform any desired actions here
}

Finally, your component will look like this:

<form onSubmit={ this.handleLogin }

To address your inquiries, all the necessary information from the event will be accessible through the e parameter, including details on who triggered the event and its location.

Answer №2

If you prefer not to use the lambda function in this case, you can opt for regular function syntax instead:

<form onSubmit={ function (event) { this.handleLogin(event) } }>

Make sure to bind the handleLogin function in the constructor to maintain the class context:

constructor() {
  ..
  ..
  this.handleLogin = this.handleLogin.bind(this);
}

This approach will prevent the jsx-no-lambda tslint error.

It's important to remember that passing a function as props will create a new instance of the function every time the component renders, which could impact performance.

For more details, check out Passing function to components

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