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An additional step is then taken to translate this intermediate DOM into the real HTML DOM. The ShapeEditor uses this idea to do the parsing inside of its render and forwards the detected shapes by setting the shapes property of the ShapeCanvas. Component — The way in which you create a new component.
We replace the old array of comments with the new one from the server and the UI automatically updates itself. The other solo thing in this code example is Hello world!. We recommend following to configure syntax highlighting for your editor. However, we used slice to create a new copy of the squares array after every move, and. It is as comprehensive as advertised. DOM manipulation is the ring of a responsive website, unfortunately it is slow in most JavaScript frameworks. The DOM itself is generated from a textual html-template that is pulled from a different file, script-block or a precompiled template function. Class Time extends React. Notice that in our addFriend method we met a new way to invoke setState. There are generally two approaches to changing data.
Some of the method names do seem to have taken a cue from the Cocoa frameworks in Mac and iOS Miscellaneous Features Within a component-tree, data should always flow down. The resulting values should be passed down to child components using attributes that are accessible in said children via this. It also sets up event-handlers and takes care of manipulating the DOM tree as part of its lifecycle. How Does It Work?
Learning React.js: Getting Started and Concepts - Component { constructor props { super props ; this.
Related Video Course: What is React? It is used at Facebook in production, and Instagram. One of it's unique selling points is that not only does it perform on the client side, but it can also be rendered server side, and they can work together inter-operably. It also uses a concept called the Virtual DOM that selectively renders subtrees of nodes based upon state changes. It does the least amount of DOM manipulation possible in order to keep your components up to date. How does the Virtual DOM work? Imagine you had an object that you modeled around a person. It had every relevant property a person could possibly have, and mirrored the persons current state. This is basically what React does with the DOM. Now think about if you took that object and made some changes. Added a mustache, some sweet biceps and Steve Buscemi eyes. In React-land, when we apply these changes, two things take place. The second step is reconciliation, where it updates the DOM with the results of diff. The way React works, rather than taking the real person and rebuilding them from the ground up, it would only change the face and the arms. This means that if you had text in an input and a render took place, as long as the input's parent node wasn't scheduled for reconciliation, the text would stay undisturbed. Because React is using a fake DOM and not a real one, it also opens up a fun new possibility. We can render that fake DOM on the server, and boom, server side React views. Getting Started To get started with React, install the React CLI tool Create React App and run the command to create a new app: Install the CLI tool npm install -g create-react-app Create an app create-react-app my-app-name Install Dependencies cd my-app-name npm install You can also fork a JSFiddle they have provided: Page Setup When setting up your page, you want to include react. While this is the easiest way to get started, when its time to actually build something, its probably a good idea to use Browserify or Webpack Create React App uses Webpack to set your components up in separate files. The Basics React's basic building blocks are called components. JSX It's called JSX, and it is a Javascript XML syntax transform. This lets you write HTML- ish tags in your Javascript. I say HTML- ish because there are a couple gotchas. You are really just writing XML based object representations. For regular html tags, the class attribute is className and the for attribute is htmlFor in JSX because these are reserved words in Javascript. More differences can be. This is important, it tells React that we are using JSX and that this markup needs to be transformed, so you need to include it when using JSX syntax. Components When using the render method above, our first argument is the component we want to render, and the second is the DOM node it should mount to. We can use the createClass method to create custom component classes. It takes an object of specifications as it's argument. Props When we use our defined components, we can add attributes called props. These attributes are available in our component as this. State Every component has a state object and a props object. State is set using the setState method. Calling setState triggers UI updates and is the bread and butter of React's interactivity. If we want to set an initial state before any interaction occurs we can use the getInitialState method. The events are attached as properties of components and can trigger methods. Unidirectional Data Flow In React, application data flows unidirectionally via the state and props objects, as opposed to the two-way binding of libraries like Angular. This means that, in a multi component heirachy, a common parent component should manage the state and pass it down the chain via props. Your state should be updated using the setState method to ensure that a UI refresh will occur, if necessary. The resulting values should be passed down to child components using attributes that are accessible in said children via this. Conclusion Now that we have reviewed some React basics, take some time to check out the and read up a bit on. In the next installment of Learning React we will be integrating with Express to build an app that renders on the server side, as well as the client side, and uses socket.