An online markdown blog and knowledge repository.
Read and take notes from the following resources:
Medium.com
React State vs Props by Web Dev Simplified on YouTube
Reactjs.org State And Lifecycle
Reactjs.org Handling Events
Reactjs.org Tuturial Into to React
React-bootstap
Bootstrap Cheat Sheet
Shuffle for Bootstrap bootstrapshuffle.com
Host sites and apps on Netlify.com
Source: Joshua Blankenship on Medium.com
When you define components as classes or functions, the methods used are called 'lifecycle events'.
Methods can only be called on components during their 'lifecycle'.
Mounting: Creating a component instance and adding it to the DOM. Various built-in and required methods are executed automatically at this phase (lifecycle events).
Updating: State changes cause re-rendering, aka Updating. Various built-in and required methods are executed at this phase (lifecycle events).
Unmounting: Removing a Component from the DOM. Method 'componentWillUnmount()' is called (the last lifecycle event).
Avoid usint this.setState() in a constructor: It is unnecessary and could produce unexpected side effects. However it can be called within componentDidMount() to force a re-render event.
There are unsafe lifecycle events that should be avoided. Review the medium.com article (linked above) for details on these.
Based off the diagram, what happens first, the 'render' or the 'componentDidMount' lifecycle event?
render. componentDidMount is called during the last phase, the 'mounting' phanse and 'commit' sub-phase.
What is the very first thing to happen in the lifecycle of React?
constructor is called (in the 'mounting' phase and 'render' sub-phase).
These things happen in this order:
What does componentDidMount do?
It is a place to load network requests or make DOM initialization calls. It is a good place to subscribe to (events?) and make API calls.
What types of things can you pass in the props?
Props are a lot like arguments to a function.
Values to initialize a component's state, or data that the component can render.
What is the big difference between props and state?
Props are passed between components, and must be updated OUTSIDE of the component.
State is data within the component, and can be updated WITHIN the component.
When do we re-render our application?
When the component state changes.
What are some examples of things that we could store in state?
Values that change, and the change should be rendered to the UI.
User-updated values, like from a Form, where the UI might need to update based on the state change.
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