The image below shows a working example of the app. To make a CountDown Timer we will use CountDown component from react-native-countdown-component. Once the date and time expire, it will show an expiry notice. Then a native JavaScript function, setInterval is called to trigger setCounter (counter - 1) for every 1000ms. counter holds the number of seconds the counter should start with. Here is my code: import React, from 'react'Ĭonst = useState(getRandomNum())Ĭonst = useState(STATUS. We will create a countdown timer that will allow us to set an initial date and time to start the countdown. Explanation First attempt, in an intuitive way Initially, we utilise useState react hook to create a new state variable counter in the functional component. If I didnt provide enough code, please let me know.
I am sure the answer is obvious but I am just not finding it. I am know that useState() only sets the initial value but if I am using a click event, how do I reset useState()? I have been trying to use setCountdown(ranNum) but it crashes my app. Use setTimeout in your React components to execute a function or block of code after a period.
React timer countdown how to#
I want the clock to start counting down on a button click and have a function which changes the null of the state to a randomly generated number. See How To build a Countdown Timer with React A Timer component that will be responsible for rendering the Timer A TimerInput Component that renders a form. A timer representing setTimeout inside of a React component. If I hard code this.state with a specific countdown number, the timer begins counting down once the page loads.
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