A lot of file management is done by event handling. So it's important that we understand how React works with any DOM-style events a little more, before we delve into working with forms. In an earlier video, we said we could use any event that could be called on a DOM element in a React component with some subtle syntactic differences. 

Events used in JSX should become a camel cased rather than in lower case. So, "onclick" becomes "onClick", "onmouseover" becomes "onMouseover", and so on. React will usually recognize the event in any case, but warnings will be given in the console. In JSX, you pass a function as the event handler, rather than a string. So "onClick" with a function call to "clickHandler" as a string becomes onClick with the JSX expression. This is an arrow function that returns the call to clickHandler. 

You cannot make the handler function return false to prevent default behavior. You must explicitly use the preventDefault call in the handling function. And there is no need to ever call addEventListener in React. You just provide the event in its handler callback when the element is initially rendered. We'll be using event handling with forms to trigger value changes in form submission as we go through the rest of this topic.

Lectures

• React Form Components
• Form Submission