How to Start the Timer from 0 on Page Refresh in a React App скачать в хорошем качестве

How to Start the Timer from 0 on Page Refresh in a React App

Learn how to implement a timer in your React application that resets to `0` on each page refresh using effective techniques and best practices. --- This video is based on the question https://stackoverflow.com/q/76439754/ asked by the user 'fullstack dev' ( https://stackoverflow.com/u/22030574/ ) and on the answer https://stackoverflow.com/a/76494040/ provided by the user 'Dennis Kats' ( https://stackoverflow.com/u/8926512/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to start the timer from 0 on page refresh in react app Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Start the Timer from 0 on Page Refresh in a React App Are you working on a React application and need a timer that consistently resets to 0 each time the page refreshes? It's a common requirement for many applications, whether for countdowns, game timers, or more complex functionalities. Unfortunately, simply using a timer within your component might not yield the results you expect. Let's dive into an effective solution to this problem. Understanding the Problem When using the setInterval function in a React component, you may find yourself running into issues with timers not starting from zero upon refresh. This behavior occurs because the timer state persists even if the component unmounts or the page reloads. The Optimal Solution To ensure your timer starts from zero every time the page reloads, we can leverage both local state and the useEffect hook. Here’s a step-by-step guide: Step 1: Setting up the State First, we need to initialize our timer with a state variable. We'll use useState to create a variable that keeps track of the seconds passed since the timer started. [[See Video to Reveal this Text or Code Snippet]] Step 2: Calculating Time Left Next, we derive the countdown display from the secondsPassed. With helper constants, we calculate the remaining time in an appropriate format (minutes and seconds). [[See Video to Reveal this Text or Code Snippet]] Step 3: Implementing the Timer Logic By using setInterval, we can update the secondsPassed every second by incrementing it. This logic is wrapped inside a useEffect hook which will run when the component mounts. [[See Video to Reveal this Text or Code Snippet]] Step 4: Rendering the Countdown Finally, we just need to return the countdown display within the JSX of our component. [[See Video to Reveal this Text or Code Snippet]] Complete Example Code Here is how the entire implementation looks: [[See Video to Reveal this Text or Code Snippet]] Conclusion With the above implementation, every time you refresh your React app, the timer will start from 0. By utilizing React's useEffect and state management, we've created a responsive and reliable timer. This approach gives you full control over your state and ensures that your timer behaves as expected. Now, you can confidently incorporate timers into your React applications while ensuring they reset perfectly on each page load. Happy coding!