We'll learn about cleaning up our effects, and how to pass an empty array into the second argument of our effect to create a componentDidMount like effect. Q&A for Work. Now the addEventListener is being called at the correct time, but there is still a problem: the way it is written now will add a new listener on all component changes. Learning how to create friendly mobile navigation on the browser is really important especially with the growing use of mobile phones. } align-items: center; Here we deleted the initial content and created a global style that normalizes our CSS (make browsers render all elements consistently and in line with current standards) and a wrapper for our future navbar. box-sizing: border-box; We need to be sure and clean up any effects that we make and to do that we return a function. useEffect (() => {window. We just expect that it will return a position that is the mouse position. bottom: 0; Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. A really common need is to get the current size of the browser window. . `, ` If this component is re-rendered often, this could create a serious memory leak in our program. `, ` @media only screen and (max-width: 40em) { Skip the setup. justify-content: space-between; background-color: white; `, ` *::after { Within our useEffect we listen on the window for any mouse movements. justify-content: center; If you're confused about the destructuring of the array here is the equivalent. height: 150%; Putting it all together our hook will look like this. Hooks added a lot of functionality to stateless components. width: 100vw; we have our new tab bar which is closer to what we are used to seeing in mobile apps. left: -25%; width: 3rem; width: 100%; display: flex; One thing to look out here is if we add a normal toggle, then, when we open the drawer, we won't be able to close it. `, ` Or is it best to wipe that out and make a component? flex-direction: column; I'm going to use this article to help make my website more mobile friendly! useEventListener If you find yourself adding a lot of event listeners using useEffect you might consider moving that logic to a custom hook. The second argument to useEffect is empty because we only need to attach the window listener once. background: transparent; &:after, This will run when the component is unmounted, or anything in our second argument array changes. In this post we will be learning how to build mobile-friendly navigation, applying what we learned. (caveat: since all elements are hidden users most likely won't find relevant routes). Which only runs at the rendering phase, so it won't run on the server. `, ` border: none; `, ` background-color: white; } flex-direction: column; padding: 1rem 2rem; *::before, height: 2px; In this lesson we'll explore how to create `useEffect` call, and listen to the window for mouse movement. This hook returns an object containing the window's width and height. width: 100vw; Let's say we are creating a navbar for a blog website. server-side (no window object) the value of width and height will be undefined. align-self: flex-start; padding: 1rem 3rem; You'll notice we didn't apply a function to our addEventListener. React hooks were introduced in react 16.8, and whilst it is not trying to replace using classes it … Open source and radically transparent. } Add the next dependency. For more up-to-date web development content, follow me on Twitter, and Dev.to! flex: 1; display: flex; position: absolute; } We say that because we can run them and immediately forget about them. transform: translateX(100%); We'll create a separate file called useMousePosition and import a function that we'll export later. content: ""; align-items: center;

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