Forms in React: Controlled or not

- [Instructor] The next step we'll … be taking is updating our little app's state based on … what happens in our filter form here. … But before we do that let's take a brief pause … to talk about the two main ways … that you can work with forms in React. … Specifically, we're going to be talking … about controlled versus uncontrolled form elements. … What we're asking here is who is the source … of truth for the form data? … It can either be React state … or it can be the DOM elements that comprise the form. … First, we'll talk about controlled components. … A controlled form component is one where React is the source … of truth or more specifically, … React's state is the source of truth. … That means that your code controls … whether the form value changes. … So, for example, you can do validation in your React code … and then not update the state of the element … that you're validating and the value won't change … no matter what the user has typed. … When you're working with controlled components every piece …