Isomorphic Form

Many modern web-apps combine javascript and form controls to process user input within the browser. This is all well and good, but what if your code breaks or your user is on an unsupported browser?

Wouldn't it be great if you could gather your form data either through javascript or through traditional form submission, and only write the code to process it once?

Isomorphic Form takes care of this for you. Once it's set up it will send submitted form data to your router, and you don't need to care whether that data came from an HTTP submission or from a javascript submit event.

Benefits of this:

• Support old browsers without supporting their old javascript
• Do less transpilation
• Put IE11 out of your mind

Status

This project is in working order, but it's not pretty and the API may not be stable. The main things left before publishing v1.0.0 are to improve the tests and documentation. Help with road testing and improvements would be greatly appreciated!

Name

I'm not sure the name isomorphic-form is a great idea, but universal-form and universal-form-data were taken and I'm not feeling very creative.

How to use

The package contains two functions, one for the client and one for the server, who expose the form data as an instance of a FormData subclass.

Once you have this data, along with the form method (GET or POST) and the action (the destination url) you can pass it to your universal router or other code to handle it. You no longer have to care if your code is running on client or server.

The FormData sublcass has a toString method which returns the data as a query string in case you want to do something like append it to a url. It also has a toJSON method and a fromString static method.

On the server, FormData is from JSDOM. On the client it's the native implementation.

npm install --save isomorphic-form

In the browser

const isoForm = require("isomorphic-form/dist/form");

const onSubmit = (data, method, action) => {
  // This is where you pass the data to your router
};

const formEl = document.querySelector("form.myForm");

// This sets up the listeners and plugs in your callback
const remover = isoForm(onSubmit)(formEl);

// When you're ready to remove the listeners:
remover();

On the server

const app = require("express")();
const parseFormData = require("isomorphic-form/dist/server");

// Make sure you're not using any form-data body-parser plugins before here
app.use("*", async (req, res) => {
  const data = await parseFormData(req);
  const method = req.method;
  const action = req.originalUrl;

  // This is where you pass the data to your router.
});