Learning Objectives
React Week 3
Data fetching
Show some data from an API in a component.
- Can explain why a loading state is necessary when fetching data as the result is not available on the initial render
- Be able to trigger
fetch()
using theuseEffect()
callback, with an empty array ([]
) as the 2nd dependencies argument - Be able to store data from a successful API call in state
- Allow effects to update in response to prop changes
- Explain why a component with an effect dependent on props is broken with empty
useEffect()
dependencies ([]
) - Be able to fix a component with an effect dependent on props using the
useEffect()
dependencies - Can describe the "lifecycle" of a component with
useEffect()
when props change
- Explain why a component with an effect dependent on props is broken with empty
Forms
- Create a simple form in React using the controlled component pattern
- Can initialise state with
useState()
- Be able to set the input
value
to the state variable - Can explain why the input does not change when typing if
onChange
is not set - Be able to update the state using an
onChange
handler
- Can initialise state with
- Use data from a submitted form to update the application
- Be able to handle an
onSubmit
event to the form - Be able to collect the form state variables and use them (setting state, POST request)
- Be able to handle an