Form Controlled Components-React – Steven Meads – Medium

Form Controlled Components-React  #react #javascript #reactjs

  • Form Controlled Components-ReactI recently built a React application where a few components were input forms.
  • I’ve highlighted a few concepts I found most helpful below.Main ConceptsForm elements typically maintain their own state and update it based on user input.In React, mutable state is typically kept in the state property of components, and only updated with setState().
  • A React component that renders a form also controls what happens in that form on subsequent user input.An input form element whose value is controlled by React in this way is called a “controlled component”.
  • It is invoked via the onSubmit listener sitting on the form itself.We can then invoke a handleClick method, passed down from the parent component, pass it this.state.value as an argument, and now the input value from our user can be passed down as a prop to other components that depend on it.Quick SummaryIn short summary, setting up form elements as controlled components modifying or validating user input becomes much easier.
  • It also makes it more straightforward to pass user input up to the parent component where those input values can then be distributed throughout the application as needed.I hope this quick run through of form elements as controlled components was helpful.

I recently built a React application where a few components were input forms. Initially, I was at a loss about how I was going to retrieve the necessary input values needed for updating the parent…

@ReactDOM: Form Controlled Components-React #react #javascript #reactjs

I recently built a React application where a few components were input forms. Initially, I was at a loss about how I was going to retrieve the necessary input values needed for updating the parent component’s state. I was relieved when I came across a few resources clearly explaining controlled components. The most helpful resource I found was came straight from the React Docs. Their docs provide a comprehensive understanding of controlled components and why you might wan’t to set up form elements as such. I’ve highlighted a few concepts I found most helpful below.

In the above code snippet we can see a form element as a controlled component. This example is very similar to the example provided by the React Docs.

In short summary, setting up form elements as controlled components modifying or validating user input becomes much easier. It also makes it more straightforward to pass user input up to the parent component where those input values can then be distributed throughout the application as needed.

I hope this quick run through of form elements as controlled components was helpful. I’ve provided a few other resources I found helpful below.

Form Controlled Components-React – Steven Meads – Medium