Now you can use a Hook inside the existing function component. There are 44 other projects in the npm registry using react-timer-hook. Start using react-timer-hook in your project by running npm i react-timer-hook. ![]() ![]() Latest version: 3.0.7, last published: 4 months ago. js/ React 60s countdown, Programmer All, we have been working hard. If you write a function component and realize you need to add some state to it, previously you had to convert it to a class. React timer hook is a custom react hook built to handle timers (countdown), stopwatch and time logic/state in your react component. Build a Countdown Timer with React In this tutorial we build a countdown timer with react. For example, useState is a Hook that lets you add React state to function components. Spread the love Related Posts Create a Counter App with React and JavaScriptReact is an easy to use JavaScript framework that lets us create front end apps. You could definitely take this as a springboard and make it more extensible, perhaps add the ability to select which time components to include for example.Ĭode for this post can be located as a gist on my Github account here.In this Web Development tutorial we are going to create a countdown timer using the React JavaScript librari / framework and also using React Hock like useState and useEffect Donation! Content of this tutorial What is a Hook?Ī Hook is a special function that lets you “hook into” React features. I’ll acknowledge that the countdown NPM package is probably overkill for this particular exercise but again, it saved me the hassle. Now it should be fairly simple to hook this up: const endDate = new Date(2018, 11, 22) Let timespan = countdown(now, endDate, countdown.DAYS | countdown.HOURS | countdown.MINUTES | countdown.SECONDS) In my own version I called this a TimerSpanDisplay and implemented it as a functional component: const TimerSpanDisplay = function TimerSpanDisplay(props) ) To get this party started we need a way to display each time component (eg. Ultimately I decided to err on the side of completeness. I tossed back and forth whether I should simplify them for sake of the demo or leave them complete in order to show how I implemented it. Creating the countdown timer in Reactįirst off let me preface this that I’m using Bootstrap 4 with Font Awesome 5 so please allow that to explain the large className lists. I selected this one because it is highly configurable which, given the client, means I’ll save a lot of time in the future when they change things on me again. I’ll be the first to admit that’s too big for the use-case I’m introducing but I’m going with it anyway. ![]() Uncompressed it is 28kb and minified around 13kb. I decided to look around for an NPM package to provide me this functionality. That worked just fine the previous time around but it doesn’t really give me a lot by way of options. HoursInSeconds = 60 * 60, // 3600 seconds Here’s how I did it last time around: // first we need to determine the time units as seconds: In order to break our time into the components per that image above we need to get the total seconds left until the event and then further narrow into the time components we want. While the overall premise was good it wasn’t quite going to work without some massaging on the new site. ![]() I pulled up my old code assuming I had implemented it with angularJS but much to my surprise I found jQuery code instead.
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