- In their most basic form, React components (views) are a function that takes data and outputs DOM elements: – – Here’s an example of the render function of a React component: – – What happens if the data changes?
- We can now use a simple reference comparison to detect whether our data has changed: – – The list of todos has also changed: – – But, the first todo hasn’t changed, it’s still the same object!
- If you’re using Immutable.js, a reference comparison in is enough to determine if a component’s data has changed.
Continue reading “React and Immutable.js”
Stencil components are created by adding a new file with a .tsx extension, such as my-first-component.tsx, and placing them in the src/components directory.
The .tsx extension is required since Stencil components are built using JSX and TypeScript.
Continue reading “Things to like in @stenciljs:
– Compiles to #WebComponents
– #TypeScript by default
– JSX familiar to #Reactjs devs”
- Helping developers understand what they can use in their React components was our first priority when we set up flow types for Apollo.Let’s take for example a simple React component wrapped with the graphql HOC from React Apollo.
- This component will display a hero from Star Wars and their friends with data returned from a GraphQL endpoint:The above code pulls some data from a GraphQL API using a query and includes lifecycle information, such as loading and error information.
- We tell Flow what the shape of the result will look like from the server when the graphql enhancer wraps a component.
- If you already are a user of Flow and have your data typed already, with a couple of imports and a single type addition, you can type any component that is wrapped with graphql!Currently Flow does not support the ES7 decorator syntax so you won’t be able to get all of the benefits of stronger type support if you are using decorators.
- Let’s make a change to our initial component that converts it to use a prop called episode:We can define the props that our exported component will need (InputProps) and attach them to our enhancer using the second type generic of OperationComponent.
Static typing can be low-hanging fruit to improve your app. As data flows throughout the application, it is easy to forget its shape, and even for what it’s used. Although you could have unit tests…
Continue reading “A stronger (typed) React Apollo – Apollo GraphQL”
- It is also solving many puzzles for me like some ES6 syntax I have been sighing at for the past few weeks not knowing what is was.Ok, to explain the idea behind the picture I think I now understand, and maybe even like, arrow functions.
- The arrow function doesn’t just make for more concise and cleaner code but it actually has a major impact on React with the ‘this’ word.When using ‘this’ in a function it takes on that function’s scope.
- The great thing about making that same function with the arrow syntax is now that same ‘this’ will now use the scope outside of that function.
- The reason why I focused so much on React this week is because it’s both enjoyable and easy to see what’s going on.
This week has been great! Eating steak, buying a 28″ monitor, grass seed is actually growing and 40 hours of learning React.js. After three tutorials and falling down a number of rabbit holes my…
Continue reading “All the Arrows point to REACT.js – Brad Hankee – Medium”
- We can modify our component to display the data being passed in:
Near the top of the file, lets add some different places that we might want to display weather for:
Now, upgrade the App’s render function to iterate over each place, and render a tag for it.
- We want our app to be able to switch between places, so we can use state to keep that data in our App component.
- Let’s use the and in our App component:
At this point, your file should look like this.
- Let’s install it, alongside which provides the React components for it:
In the top of the app file, import the css from the bootstrap module:
Next, import the components we want to use from .
- Now, replace the App component’s render function to use the bootstrap components:
Now our app is starting to look more polished, but it would be nice to have a custom theme.
intro-to-react – A Hands-On Walkthrough of your first React Web App
Continue reading “intro-to-react/README.md at master · ericvicenti/intro-to-react · GitHub”
- I started to look into this problem and realized that a solution to this is to maintain only the visible portion of an infinite list in the DOM tree and render/remove invisible parts as the user scrolls.
- Using the in-place measurement also allow us to accommodate cases where the item height is changed after rendering, such as when loaded images change the overall height of a tweet.
- Think of the case where a user has scrolled down 5 pages: if they choose to resize the window, we will want the app to adapt to it gradually instead of waiting for to remeasure all items; fortunately the in-place measurement technique works with this scenario.
- We update new item heights into cache and allow the system to correct itself as the user scrolls.
- Whenever there is a difference in expected item heights and the actual item heights, the scroll position will be affected.
I have worked on Twitter’s new mobile website for the past year. We rebuilt the
website using the latest web technologies: React, Redux, Node.js/ …
Continue reading “height_change:ne->update_projection”