React router dom params

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React router dom params

React Router is a lightweight library that allows you to manage and handle routing for your React application. Among the most prominent features of React Router are route render methods, which enable your component to access match, location, and history props. Together, these props are used to pass data from URL to component and navigate your React application programmatically. For example, if you'd like to create a back button, you can use the goBack() function from history props. This abstracts away the differences in various environments or web browsers so you can go back to the previous webpage in a simple function. // a Route with component props // The component itself function Post(props) { return ( In React Router v4, you get the history object from props. props.history.goBack()}> Go back ); } Although this works fine, the route render method is widely considered hard to read and just plain weird. That's why, starting with version 5.1, React Router will include four useful hooks you can use to write clean, neatly stacked navigation components that please the eye. I'll show you how these new hooks work by comparing them to the old patterns in version 4. We'll start with the useParams hook. UseParams The useParams hook will return an object of key/value pairs from your application URL that is set to be dynamic. In a complex application, it's common to have many navigation links that are dynamic. For example, you may have a /post/:id URL that also initiates a fetch process to your application's backend. In this case, the most common React Router pattern would be to use a component prop. export default function App() { return ( Home First Post ); } By passing the Post component into the /post/:number Route component, you can extract the params object from the match prop that is passed by React Router into the Post component. // Old way to fetch parameters function Post({ match }) { let params = match.params; return ( In React Router v4, you get parameters from the props. Current parameter is {params.slug} ); } This method works just fine, but it's quite cumbersome if you have a big application with lots of dynamic routes. You have to keep track of which Route components need component props and which do not. Also, since the match object is passed from Route into the rendered component, you will need to pass them along to components further down the DOM tree. This is where the useParams hook really shines. It's a neat helper function that gives you the parameters of the current route so you don't have to use the component props pattern. Click here to see the full demo with network requests function Users() { let params = useParams(); return ( In React Router v5, You can use hooks to get parameters. Current id parameter is {params.id} Current hash parameter is {params.hash} ); } If a child component of Users need access to the parameters, you can simply call useParams() there as well. Here's an example if you'd like to see it in action. UseLocation In React Router version 4, just like fetching parameters, you had to use the component props pattern to gain access to a location object. function Post(props) { return ( In React Router v4, you get the location object from props. Current pathname: {props.location.pathname} ); } With version 5.1, you can call the useLocation hook to get the location object from React Router. // new way to fetch location with hooks function Users() { let location = useLocation(); return ( In React Router v5, You can use hooks to get location object. Current pathname: {location.pathname} ); } Again, you can see the sample code on CodeSandbox. UseHistory That gives us one less reason to use component props. But don't you still need to use the component or render pattern to get the history object? The history object is the last reason why you need to use component or render props pattern. // Old way to fetch history function Post(props) { return ( In React Router v4, you get the history object from props. props.history.goBack()}> Go back ); } By using the useHistory hook, you can get the same history object without needing the Route component to pass it down. // new way to fetch history with hooks function Users() { let history = useHistory(); return ( In React Router v5, You can use hooks to get history object. history.goBack()}> Go back ); } See this sample code for a comparison between useHistory and regular history props. Now you can have a clean routing component without any weird component compositions that use component or render props. You can simply put a component with path props and place the rendered children component inside it. useRouteMatch Sometimes, you need to use the component just to get access to a match object. function Post() { return ( { return ( Your current path: {match.path} ); }} /> ); } The example above shows one way to access a match object without using the component or render props. With the latest version of React Router, you can also use the useRouteMatch hook, which enables you to grab the match object and use it inside your component without using . // useRouteMatch to make your route above cleaner function Users() { let match = useRouteMatch("/users/:id/:hash"); return ( In React Router v5, You can use useRouteMatch to get match object. Current match path: {match.path} ); } Now you won't need to create a component just to grab a match object. Here's another example for you to mess around with. Conclusion The React Router team harnessed the power of hooks and implemented it to share logic across components without the need to pass it down from from the top of the tree. If you'd like to refactor your component with these new hooks, you can start by updating components that use match, location, or history objects. // before function userComponent({ match, location, history }) { let { slug } = match.params // ... } // after function userComponent() { let { slug } = useParams() let location = useLocation() let history = useHistory() // ... } After that, you can update the weird-looking components you might have in your navigation component. // before // after What do you think about React Router hooks? Share your comments below. Debugging React applications can be difficult, especially when users experience issues that are difficult to reproduce. If you're interested in monitoring and tracking Redux state, automatically surfacing JavaScript errors, and tracking slow network requests and component load time, try LogRocket. LogRocket is like a DVR for web apps, recording literally everything that happens on your React app. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. LogRocket also monitors your app's performance, reporting with metrics like client CPU load, client memory usage, and more.The LogRocket Redux middleware package adds an extra layer of visibility into your user sessions. LogRocket logs all actions and state from your Redux stores. Modernize how you debug your React apps -- start monitoring for free. There are times where creating a full page doesn't make sense for a particular route in your application. Generally this means creating a Modal. However in the event that a user wants to link to it we need it to exist as a route. An example we'll focus on is a login modal. We want to link to the modal, however it should be able to be linked and appear over any page dynamically. Depending on your route structure this can be tricky, so we'll use a query param. So let's explore how to setup a query param modal that can be rendered over any page. Setup Routes First we need to setup our pages. Our routes are just 2 pages, the home page and the profile page. These could be any number of pages, but these will sit inside the Switch. Whenever the paths are matched they will render. import React from "react"; import ReactDOM from "react-dom"; import "./index.css"; import { BrowserRouter, Switch, Route } from "react-router-dom"; import HomePage from "./pages/home"; import ProfilePage from "./pages/profile"; const routes = ( ); ReactDOM.render(routes, document.getElementById("root")); Pages Now here are our 2 pages, they both have links to the Login link. We haven't wired these up just yet but we'll do that later. import React, { Component } from "react"; import { Link } from "react-router-dom"; export default class HomePage extends Component { render() { return ( Go To Profile Login ); } } import React, { Component } from "react"; import { Route, Link } from "react-router-dom"; export default class ProfilePage extends Component { render() { return ( Login ); } } Create a Modal Rather than focusing on a specific Modal we'll create a reusable one. We'll be using createPortal from react-dom. We don't want to render to document.body so in our index.html we'll add another div to render to which we'll give an id of modal_root. createPortal will render React provided, to a different place in the DOM and ensure that all appropriate context is passed along as well. Think of it as a "transport this HTML somewhere else". This allows for you to render something that makes sense hierarchically but functionally needs to exist somewhere else in the DOM. The wrapping div will apply our styling, so it will be a fixed div covering the screen with a dark background. Upon click it will call a passed in onClick method which later we'll use for closing the modal. We pass in our children which means any React that we want will be rendered in our modal, and transported to modal_root. import React, { Component } from "react"; import { createPortal } from "react-dom"; const modalStyle = { position: "fixed", left: 0, top: 0, bottom: 0, right: 0, backgroundColor: "rgba(0,0,0,.2)", color: "##FFF", fontSize: "40px", }; export default class Modal extends Component { render() { return createPortal( {this.props.children} , document.getElementById("modal_root") ); } } Create Login Modal Now we will create our login modal route. If we're rendering this as a page and we want it to work anywhere that we render we can't hard code any specific paths, they must be dynamic. The behavior we desire is that if the background is clicked that the modal closes. We can do this with the history prop passed in by React Router. Additionally rather than referencing match.url which is the path is matched by React Router. So instead we use the location.pathname which will return the current path in URL minus the query params. import React, { Component } from "react"; import Modal from "./modal"; export default class LoginPage extends Component { render() { return ( { this.props.history.push(this.props.location.pathname); }} > Login modal ); } } Render Routes Base on Query Params To make this work we need to render our route outside of the Switch. The reason this will work is because the Route will render all the time. We've supplied it a path of / and did not put the exact prop on it. So anytime the route changes in our application this route will re-render. This technique of depending on a query param is great for when you have a lot of exact routes. It also would not make sense to have the path be a hard coded /profile/login. So depending on a query param is an easy solution. import React from "react"; import ReactDOM from "react-dom"; import "./index.css"; import { BrowserRouter, Switch, Route } from "react-router-dom"; import HomePage from "./pages/home"; import ProfilePage from "./pages/profile"; import Login from "./pages/login"; const routes = ( ); ReactDOM.render(routes, document.getElementById("root")); Login Modal Route Based on Query Now that we're rendering our login page, lets make the LoginPage modal actually respect the query param. We use the URLSearchParams, which will take the query params, also called the search portion of the URL, and provide us with a bunch of helpers. We grab our params, and do a .get("login") to check the existence of the login query param. If it exists we return our login modal, otherwise nothing will return and nothing will render. This is supported by all browsers except for IE. You do not need to use URLSearchParams you can parse and access the query params however you see fit. import React, { Component } from "react"; import Modal from "./modal"; export default class LoginPage extends Component { render() { let params = new URLSearchParams(this.props.location.search); return ( params.get("login") && ( { this.props.history.push(this.props.location.pathname); }} > Login modal ) ); } } Fix Links We need to fix our links, but because we are rendering it on any page we should craft dynamic links. The Link component from React Router can receive a string but also an object for its to prop. We supply an object and provide a pathname which will be our match.url so the path that we are matching on, and then additionally a search key and pass in ?login=true so that it's not undefined and will register accordingly with our URLSearchParams. Login Ending Now we have a dynamic modal route based upon query params. The main technique to take away here is that you can render Routes anywhere. They don't have to be just in a top level Switch. They will render when the path is matched, and that's what we take advantage of here. We can create always rendering routes that will allow us to create these types of interfaces. You can check out the code here and or check out the . react router dom params typescript. react router dom params not working. react router dom params undefined. react router dom params in class component. react router dom params hook. link react router dom params. react router dom query params. react router dom get query params

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