Solution: add a dependency of counter in useEffect hook so that every time when the counter changes, a new setInterval() is called. Let setInterval() get triggered every time when component gets re-rendered.To overcome the issue mentioned above, we need to trigger the setInterval() in every single App() call with different counter value, just as illustrated below. Third Attempts, useEffect with cancelling interval But in fact, it is not freezed, it is being reset all the time but the value is ALWAYS 59. That's why the counter seems to be freezed at 59. In the global environment, there is only one setInterval() instance which contiguously set the counter to 59, causing new App() calls always get the state counter to be 59. Therefore, within the App() scope, only in the first time, the useEffect() is triggered and the setInterval() is within the first time App() scope with the property counter always equal to 60. ![]() The following illustration may make things clearer.īecause every time when the component is re-rendered, the App() function is called again. This counter is indeed not decreased because the setCounter hook essentially does not change the counter within THIS function. But setCounter() definitely has run, then why isn't the counter updated? getElementById ( " root " ) render (, rootElement ) Įnter fullscreen mode Exit fullscreen modeĪll the numbers printed out are 60, which means the counter itself has not been decreased at all. It will start when someone opens the email / invite (they can restart it with the play button).Import * as React from " react " import const rootElement = document. Add it to an email or to a meeting invite (via Insert Picture).Use it in Excel or Word (via Insert Picture) as part of a quiz or form – re-starts on click.The timer restarts when you refresh the board (so simply refresh it each time you start on the next list) Upload it as a cover image to Trello – possibly as the top item on a list.But if the deck is refreshed the timers start as you click to the next slide And the page needs to be refreshed for it to work. Load it into Jamboard for different pages.Use it with PowerPoint and OBS as a drone breakout participant in Zoom and Teams.Add it as a source in OBS in your webcam to help people keep to time.Insert it into a webpage, to control an activity.Paste it into Microsoft Whiteboard as a means of timebounding activity – simply click to stop and restart.Use it within Powerpoint or Google slides as a timer for slide guided activities, or for quizzes.And then upload it via the application’s own image import facility. ![]() ![]() Other applications sometimes work better if you save the image. These copied images you can paste directly into some applications, and they work immediately. Simply right-click the timer image and select ‘copy image’ or ‘save image as …’ as appropriate.
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