Writing Forms in React

HTML forms are hard…
Developing forms in react could be even harder:

We have to render each input control using its recent value, but still to maintain the overall form state so we’ll be able to submit its values in a single transaction.

Take a look over the following naive implementation:
Fill both inputs and hit ‘submit’.
Now - check the ‘Use default values’ checkbox and try again.

What went wrong?
By initiating the input with props value, user changes stop to take affect.

However, using this pattern enforce us to implement a dedicated from-container component with its own predefined state each time.
Over and over again…

I’d like to suggest a new approach, using only react native API.
What if — we’ll be able to use controlled-components strength but also preserve common reusable functionality?

In order to do so, we’ll have to agree over a common field ← → form interface:

The Filed component is a general controlled-component, it has an initial value defined by its props.value, and a internal state.newValue been updated by user interaction.

Now, let’s have a look over the Form component implementation:

Let take a closer look over the handleChange() event handler:

The form component updates its inner fields state upon every change.
In this way — when the user submit the form, the fields set is already up-to-date with each field latest value.
All there left to do, is to construct a suitable dictionary/object, and send it away!

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