Creating a Simple Multi-Page React Native App

Click here: => wussfinece.fastdownloadcloud.ru/dt?s=YToyOntzOjc6InJlZmVyZXIiO3M6MzA6Imh0dHA6Ly9iYW5kY2FtcC5jb21fZHRfcG9zdGVyLyI7czozOiJrZXkiO3M6Mjk6Ik11bHRpIHBhZ2UgcmVhY3QgYXBwIHR1dG9yaWFsIjt9


But there is still more to learn about react. When you build the app with this routing setup, those components will all be together in one single. Those are the basics behind React JS.

Detecting changes in immutable objects is considerably easier. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. To learn more about defining components, check out the.

React Tutorial: Creating a Simple Application Using React JS and Flux Architecture

Now that you've familiarized yourself with the basics of how to work with React, let's kick things up a few notches. What we are going to do is use React to build a simple single-page app also referred to as SPA by the cool kids... Like we talked about in our forever ago, single-page apps are different from the more traditional multi-page apps that you see everywhere. The biggest difference is that navigating a single-page app doesn't involve going to an entirely new page. Instead, your pages commonly known as views in this context typically load inline within the same page itself: When you are loading content inline, things get a little challenging. The hard part is not loading the content itself. That is relatively easy. The hard part is making sure that single-page apps behave in a way that is consistent with what your users are used to. With multi-page apps, these three things come for free. There is nothing extra you have to do for any of it. With single-page apps, because you aren't navigating to an entirely new page, you have to do real work to deal with these three things that your users expect to just work. You need to ensure that navigating within your app adjusts the URL appropriately. You need to ensure your browser's history is properly synchronized with each navigation to allow users to use the back and forward buttons. To deal with all of this, you have a bucket full of techniques commonly known as routing. Routing is where you try to map URLs to destinations that aren't physical pages such as the individual views in your single-page app. That sounds complicated, but fortunately there are a bunch of JavaScript libraries that help us out with this. One such JavaScript library is the star of this tutorial,. React Router provides routing capabilities to single-page apps built in React, and what makes it nice is that extends what you already know about React in familiar ways to give you all of this routing awesomeness. In this tutorial, you'll learn all about how it does that... A React Book Written by Kirupa?!! To kick your React skills up a few notches, everything you see here and more with all its casual clarity! The Example Before we go further, take a look at the following example: Your browser does not support inline frames or is currently configured not to display inline frames. What you have here is a simple React app that uses React Router to provide all of the navigation and view-loading goodness! Click on the various links to load the relevant content, and feel free to to use the back and forward buttons to see them working. In the following sections, we are going to be building this app in pieces. By the end, not only will you have re-created this app, you'll hopefully have learned enough about React Router to build cooler and more awesomer things. Getting Started The first thing we need to do is get our project setup. We'll use our trusty create-react-app command to do this. We will do that, but first, we are going to install React Router. To do that, run the following command: npm i react-router-dom --save This copies the appropriate React Router files and registers it in our package. That's good stuff, right? Now that you've done this, it is time to clean up our project to start from a clean slate. Once you've done this, let's create our index. In your public folder, create a file called index. There shouldn't be anything surprising here. Next, we'll create our JavaScript entry point. Inside the src folder, create a file called index. The Main component will be the starting point for our SPA expedition using React Router, and we'll see how starting with the next section. Building our Single Page App The way we build our app is no different than all the apps we've been building so far. We will have a main parent component. The magic React Router brings to to the table is basically choosing which components to show and which to hide. Displaying the Initial Frame When building a SPA, there will always be a part of your page that will remain static. This static part, also referred to as an app frame, could just be one invisible HTML element that acts as the container for all of your content, or could include some additional visual things like a header, footer, navigation, etc. In our case, our app frame will just be a component that contains UI elements for our navigation header and an empty area for content to load in. Inside our src folder, create a new file called Main. We have a component called Main that returns some HTML. To see what we have so far in action, npm start it up and see what is going on in your browser. You should see an unstyled version of an app title and some list items appear: I know that this doesn't look all fancy and styled, but that's OK for now. We will deal with that later. The important thing to call out is that there is nothing React Router specific here. Creating our Content Pages Our app will have three pages of content. This content will just be a simple component that prints out some JSX. Let's just get those created and out of the way! First, create a file called Home. Ut aliquam, ipsum vitae gravida suscipit, metus dui bibendum est, eget rhoncus nibh metus nec massa. Maecenas hendrerit laoreet augue nec molestie. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Duis a turpis sed lacus dapibus elementum sed eu lectus. Create a file called Contact. The easiest thing to do is post on our forums. If you took a look at what it is you were adding, you'll see that these components can't get any simpler. They just returned some boilerplate JSX content. Now, make sure to save all of your changes to these three files. We'll look at how to make them useful shortly. Using React Router We have our app frame in the form of our Main component. We have our content pages represented by the Home, Stuff, and Contact components. What we need to do is tie all of these together to create our app. This is where React Router comes in. To start using it, go back to Main. In addition, we are importing our Home, Stuff, and Contact components since we will be referencing them as part of loading our content. The way React Router works is by defining what I call a routing region. There is no way to easily explain this without first getting our hands dirty and implementing what we just read about. The first thing we are going to do is define our routing region. Inside our Main component's render method, add the following highlighted lines: class Main extends Component render return Simple SPA Home Stuff Contact ; The HashRouter component provides the foundation for the navigation and browser history handling that routing is made up of. What we are going to do next is define our navigation links. We already have list elements with the a element defined. We need to replace them with the more specialized NavLink component, so go ahead and make the following highlighted changes: class Main extends Component render return Simple SPA Home Stuff Contact ; For each link, pay attention to the URL we are telling our router to navigate to. This URL value defined by the to prop acts as an identifier to ensure the right content gets loaded. The way we match the URL with the content is by using a Route component. Go ahead and add the following highlighted lines: class Main extends Component render return Simple SPA Home Stuff Contact ; As you can see, the Route component contains a path prop. The value you specify for the path determines when this route is going to be active. When a route is active, the component specified by the component prop gets rendered. This means the contents of our Stuff component get rendered. You can see all of this for yourself. Jump back to your browser to see the live updates or run npm start again. Click around on the links to see the content loading in and out. Something seems off, though, right? The content for our home page seems to always display even if we are clicking on the Stuff or Contact links: That seems problematic. We'll look at how to fix that and do many more little housekeeping tasks in the next section when we go one level deeper into using React Router. It's the Little Things In the previous section, we got our SPA mostly up and running. We just wrapped our entire routing region inside a HashRouter component, and we separated our links and the place our links would load by using the NavLink and Route components respectively. Getting our example mostly up and running and fully up and running are two different things. In the following sections, we'll close those differences. Fixing our Routing We ended the previous section by calling out that our routing has a bug in it. The contents of our Home component is always displaying. This means our Home component always matches whatever path we are trying to navigate to. The fix for that is simple. In the Route component representing our home content, add the exact prop as highlighted below: This prop ensures the Route is active only if the path is an exact match for what is being loaded. If you preview your app now, you'll see that the content loads correctly with the home content only displaying when our app is in the home view. Adding Some CSS Right now, our app is completely unstyled. The fix for that is easy. In your src folder, create a file called index. At the top of index. If you preview the app now, you'll notice that it is starting to look a bit more like the example we started out with: We are almost done here! There is just a few more things we need to do. Highlighting the Active Link Right now, it's hard to tell which link corresponds to content that is currently loaded. It would be useful to have some sort of a visual cue to solve this. The creators of React Router have already thought of that! When you click on a link, a class value of active is automatically assigned to it. For example, this is what the HTML for clicking on the Stuff link looks like: Stuff This means all we really have to do is add the appropriate CSS that lights up when an element has a class value of active set on it. To make this happen, go back to index. You'll see that the active link whose content is displayed from is highlighted with a blue color. What you will also see is our Home link always highlighted. The fix for that is simple. Just add the exact prop to our NavLink component representing our home content: Home Stuff Contact Once you have done that, go back to our browser. You'll see that our Home link only gets the active color treatment when the home content is displayed: At this point, we are also done with the code changes to build our SPA using React Router. Conclusion By now, we've covered a good chunk of the cool functionality React Router has for helping you build your SPA. This doesn't mean that there aren't more interesting things for you to take advantage of. Our app was pretty simple with very modest demands on what routing functionality we needed to implement. There is a whole lot more that React Router provides including variations of APIs for what you've seen here , so if you are building a more complex single-page app than what we've looked at so far, you should totally spend an afternoon taking a look the and examples. If you have a question about this or any other topic, the easiest thing is to drop by where a bunch of the friendliest people you'll ever run into will be happy to help you out!

It looks something like this. We solve this problem by setting the onChange handler so that it updates the bound state variable when the user enters information. Currently, I am doing something similar. Transport Cost is Zero Yes, transport cost is zero. The fix for that is simple. I've put a demo of the todo application in action, but prepare to be disappointed, as it's really very straightforward. Complex Features Become Sincere Immutability makes complex features much easier to implement. For this purpose, the component has a to prop. Make sure to include this function even if your state is empty to begin with; an empty state is still a state.