14 Free React JS Books
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React.js succinctly pdf download
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Webseitenlayout mit CSS PDF Franzis Verlag, 2010. Authors Alex Banks and Eve Porcello show you how to create UIs with this small JavaScript library that can deftly display data changes on large-scale, data-driven websites without page reloads. The speed at which React has evolved promises a bright future for anyone who invests in learning it today. It makes sense to do all of this logic in CommentBox since CommentBox owns the state that represents the list of comments.
Learn how to write specifications for individual components, and then use those specs to test the code you write. HTML, XHTML, and CSS are essential tools for creating dynamic Web sites. As noted above, the Note component will access these 'properties' through this. JavaScript at Scale ZIP Packt Publishing, 2015. This area is where React really starts to shine. We replace the old array of comments with the new one from the server and the UI automatically updates itself.
We then go on to cover a wide variety of apps, and will help you to structure and build your own components. All trademarks belong to their respective company owners.
React - JavaScript Succinctly PDF Morrisville, Syncfusion Inc, 2012, — 143 p.
This article was originally published in January of 2015 but was recently updated to React 16. You can think of a component as a collection of HTML, CSS, JS, and some internal data specific to that component. I like to think of React components as the of the web. They have everything you need, wrapped in a delicious composable bundle. Above we have a picture of my Twitter profile. If we were going to re-create this page in React, we would break different sections up into different components highlighted. Notice that components can have nested components inside of them. We might name the left component pink the UserInfo component. Inside the UserInfo component we have another component orange , that we could call the UserImages component. In this example, we pass the UserImages component all of the images that the user has which currently live in the UserInfo component. The topics below are what I believe to be the fundamental aspects of React. JSX — Allows us to write HTML like syntax which gets transformed to lightweightJavaScript objects. Virtual DOM — A JavaScript representation of the actual DOM. Component — The way in which you create a new component. Component LifeCycle - componentDidMount — Fired after the component mounted - componentWillUnmount — Fired before the component will unmount - getDerivedStateFromProps - Fired when the component mounts and whenever the props change. At this point you should understand, on a very high level, how React works. Creating your First Component JSX, Virtual DOM, render, ReactDOM. Component { render { return Hello World! Every component is required to have a render method. The reason for that is render is describing the UI user interface for our component. So in this example the text that will show on the screen where this component is rendered is Hello World! The first argument is the component you want to render, the second argument is the DOM node where you want to render the component. This was a change made in React. It makes sense when you think that React can render to more things than just a DOM element. This paradigm is strong, but it does have some weaknesses. As you learn more about React, this uneasiness should quickly subside. JSX simply allows us to write HTML like syntax which eventually gets transformed to lightweight JavaScript objects. Looking at the example below, this is what your JSX will eventually be compiled into. Component { render { return React. The reason the React team went with this approach is because, since the virtual DOM is a JavaScript representation of the actual DOM, React can keep track of the difference between the current virtual DOM computed after some data changes , with the previous virtual DOM computed befores some data changes. By re-rendering the virtual DOM every time any state change occurs, React makes it easier to think about what state your application is in. JSX — Allows us to write HTML like syntax which gets transformed to lightweight JavaScript objects. Virtual DOM — A JavaScript representation of the actual DOM. Component — The way in which you create a new component. Component LifeCycle - componentDidMount — Fired after the component mounted - componentWillUnmount — Fired before the component will unmount - getDerivedStateFromProps - Fired when the component mounts and whenever the props change. Adding State to your Component state Next on the list is state. Earlier we talked about how managing user interfaces is difficult because they typically have lots of different states. This area is where React really starts to shine. Each component has the ability to manage its own state and pass its state down to child components if needed. Going back to the Twitter example from earlier, the UserInfo component highlighted in pink above is responsible for managing the state or data of the users information. In other words, if you have a multi component hierarchy, a common parent component should manage the state and pass it down to its children components via props. Component { constructor props { super props this. In other terms, any data you put on this. This username can now be used inside our component by doing {this. The last thing to talk about with state is that our component needs the ability to modify its own internal state. We do this with a method called setState. Remember earlier when we talked about the re-rendering of the virtual dom whenever the data changes? Whenever setState is called, the virtual DOM re-renders, the diff algorithm runs, and the real DOM is updated with the necessary changes. Two birds, one stone. Component { constructor props { super props this. The first thing is the handleChange method. This method is going to get called every time a user types in the input box. Remember, whenever setState is called, React creates a new virtual DOM, does the diff, then updates the real DOM. The type of the input field is obviously going to be text. The value is going to be the value of our username which was originally defined in our getInitialState method and will be updated in the handleChange method. The process for the code above would go something like this. This goes for this tutorial and the following to come. JSX — Allows us to write HTML like syntax which gets transformed to lightweight JavaScript objects. Virtual DOM — A JavaScript representation of the actual DOM. Component — The way in which you create a new component. Component LifeCycle - componentDidMount — Fired after the component mounted - componentWillUnmount — Fired before the component will unmount - getDerivedStateFromProps - Fired when the component mounts and whenever the props change. By our definition above, props is the data which is passed to the child component from the parent component. This allows for our React architecture to stay pretty straight forward. Handle state in the highest most parent component which needs to use the specific data, and if you have a child component that also needs that data, pass that data down as props. Component { render { return Hello , { this. Now in our component, we can use {this. One parent, one child. The parent is going to keep track of the state and pass a part of that state down to the child as props. Parent Component: class FriendsContainer extends React. Component { constructor props { super props this. We have an initial state and we pass part of that initial state to another component. Child Component: class ShowList extends React. Component { render { return Friends { this. All map does is it creates a new array, calls our callback function on each item in the array, and fills the new array with the result of calling the callback function on each item. Notice all that happened was we made a new array and added to each item in the original array. Then, our render method returns an unordered list with all of our friends. This keeps it simple to reason about your data. Component { constructor props { super props this. Notice that in our addFriend method we introduced a new way to invoke setState. Component { constructor props { super props this. Component { render { return Friends { this. Before we move on from props, I want to cover two more React features regarding props. They are propTypes and defaultProps. With propTypes you can specify that certain props are required or that certain props be a specific type. As of React 15, PropTypes is no longer included with the React package. Component { constructor props { super props this. Virtual DOM — A JavaScript representation of the actual DOM. Component — The way in which you create a new component. Component LifeCycle - componentDidMount — Fired after the component mounted - componentWillUnmount — Fired before the component will unmount - getDerivedStateFromProps - Fired when the component mounts and whenever the props change. Component LifeCycle Each component you make will have its own lifecycle events that are useful for various things. For example, if we wanted to make an ajax request on the initial render and fetch some data, where would we do that? Or, if we wanted to run some logic whenever our props changed, how would we do that? The different lifecycle events are the answers to both of those. Component { constructor props { super props this. Because the component has already been invoked when this method is invoked, you have access to the virtual DOM if you need it. You do that by calling this. This is where you can do necessary clean up. Well, if you stuck with me until this point, great job. I hope this tutorial was beneficial to you and you now feel at least mildly comfortable with React. For a much more in depth look at the fundamentals of React, check out our course.