Simple Countdown - A Simple Countdown Timer Login

Simple Countdown Timer using JavaScript - DEV

10 hours ago

• Step 1: Basic structure of Countdown Timer Step 1: Basic structure of Countdown Timer Only one line of HTML programming code has been used. Then I designed the webpage using the css code below. With background # 90cbf3 you can use any other color you want. <div id="timer"></div> Enter fullscreen mode Exit fullscreen mode body { text-align: center; padding: 100px 60px; background: #90cbf3; font-family: sans-serif; font-weight: lighter; } Enter fullscreen mode Exit fullscreen mode
• Step 2: Activate it using JavaScript code Step 2: Activate it using JavaScript code Now I have implemented this countdown timer with the help of JavaScript. First of all, we have set a specific date with the help of Date.parse. that is, you have to determine for what time you want to run the countdown. future = Date.parse("jun 12, 2022 01:30:00"); Enter fullscreen mode Exit fullscreen mode Then using the new Date () method I have taken the current time from the device. In this case, let me tell you, the time to use here is not the time of any server. It is only the local time of your device. Then I subtract the current time from the pre-determined time and store it in the diff (constant). As a result, I have got a total of how much time to countdown. now = new Date(); diff = future - now; Enter fullscreen mode Exit fullscreen mode Now I have converted the total time of countdown to days, hours, minutes and seconds using JavaScript's Math.floor. ➤ We know that one second is equal to 1000 milliseconds, so we have divided the whole countdown time (diff) by 1000. ➤ Right now one minute is equal to 60 seconds so in this case we have divided by 1000 * 60. ➤ Since one hour is equal to 60 minutes, in this case we have divided by 1000 * 60 * 60. ➤ One day is equal to 24 hours so in this case it is divided by 1000 * 60 * 60 * 24. days = Math.floor(diff / (1000 * 60 * 60 * 24)); hours = Math.floor(diff / (1000 * 60 * 60)); mins = Math.floor(diff / (1000 * 60)); secs = Math.floor(diff / 1000); Enter fullscreen mode Exit fullscreen mode d = days; h = hours - days * 24; m = mins - hours * 60; s = secs - mins * 60; Enter fullscreen mode Exit fullscreen mode Above we have done all the work of calculation, now we will arrange it neatly in the web page. For this I have used innerhtml and in it I have beautifully arranged how it can be seen in the webpage. Here I have added text like day, hours, minutes, seconds etc. using span respectively. document.getElementById("timer") .innerHTML = '<div>' + d + '<span>Days</span></div>' + '<div>' + h + '<span>Hours</span></div>' + '<div>' + m + '<span>Minutes</span></div>' + '<div>' + s + '<span>Seconds</span></div>'; Enter fullscreen mode Exit fullscreen mode Lastly, I have instructed to update this calculation every 1000 milliseconds using setInterval. Since the countdown time is intermittent every second, this system needs to be updated every second. setInterval('updateTimer()', 1000); Enter fullscreen mode Exit fullscreen mode
• Step 3: Give the times the size of a box Step 3: Give the times the size of a box Now I have designed it using some basic css code and arranged it beautifully in web pages. As you can see in the picture above there is a small box to hold each time. I created that box using the code below. In this case I have used the background-color of the box # 020b43. #timer { font-size: 3em; font-weight: 100; color: white; padding: 20px; width: 700px; color: white; } #timer div { display: inline-block; min-width: 90px; padding: 15px; background: #020b43; border-radius: 10px; border: 2px solid #030d52; margin: 15px; } Enter fullscreen mode Exit fullscreen mode
• Step 4: Design the text Step 4: Design the text Now at the end of it all I will design the text that I added using the span in the JavaScript code. I have used the following css to determine the size, color, etc. of those texts. #timer div span { color: #ffffff; display: block; margin-top: 15px; font-size: .35em; font-weight: 400; } Enter fullscreen mode Exit fullscreen mode Hopefully from this tutorial you have learned using JavaScript code. Please let me know in the comments how you like this tutorial. If I have done anything wrong, please let me know in the comments. Related Post: You can visit my blog for more tutorials like this. Discussion (9) Subscribe Upload image Templates Personal Moderator Templates let you quickly answer FAQs or store snippets for re-use. Submit Preview Collapse Expand LUKESHIRU Follow Dev and gamer 🛡️ Trusted User Location Bellevue, Washington Work Senior Software Engineer at VMWare Joined Jul 25, 2018 • Dropdown menu Hide A few suggestions for the JS portion: Use const/let for variables. Putting just the name declares them as globals, and you don't want that. Ideally you should have the part that calculates the difference, and the part that sets the content of the HTML element separated. Use less magic numbers. The first argument of a setInterval or a setTimeout should be a function, not a string (it isn't recommended for the same reasons eval is not recommended). Here it is with those fixes and some more: // No magic numbers... const SECOND = 1000; const MINUTE = 60 * SECOND; const HOUR = 60 * MINUTE; const DAY = 24 * HOUR; /** * Calculates the difference between two timestamps, returns a quadruple with * the difference in days, hours, minutes and seconds. * * @param {number} future */ const timestampDiff = future => /** @param {number} past */ past => [DAY, HOUR, MINUTE, SECOND].map((time, index, times) => { const diff = future - past; const previousTime = times[index - 1]; return ( Math.floor(diff / time) - (Math.floor(diff / previousTime) * (previousTime / time) || 0) ); }); /** * Start timer and set the content of the element. * * @param {string} date */ const timer = date => /** @param {HTMLElement} target */ target => { const diff = timestampDiff(Date.parse(date)); return setInterval(() => { const [days, hours, minutes, seconds] = diff(Date.now()); // Ideally we should have targets for every element // to avoid updating the entire innerHTML of the container with // every tick. target.innerHTML = ` <div>${days}<span>Days</span></div> <div>${hours}<span>Hours</span></div> <div>${minutes}<span>Minutes</span></div> <div>${seconds}<span>Seconds</span></div> `; }, SECOND); }; // We finally run it (and we save the interval return value if we wan to stop it later) const interval = timer("jun 12, 2022 01:30:00")(document.querySelector("#timer")); Enter fullscreen mode Exit fullscreen mode Like comment: Like comment: 4 likes Collapse Expand Robin Schambach Follow Joined Aug 1, 2021 • Dropdown menu Hide What's the purpose of returning a function by your timer function instead of using 2 arguments? As for your other changes I wanted to explain the very same things and couldn't agree more. However in my opinion your syntax to start the timer kinda looks ugla to be to be honest. The same goes for timestampDiff seems only harder to read. Like comment: Like comment: 1 like Collapse Expand LUKESHIRU Follow Dev and gamer 🛡️ Trusted User Location Bellevue, Washington Work Senior Software Engineer at VMWare Joined Jul 25, 2018 • Dropdown menu Hide Functions returning functions is a technique called . The purpose is to reuse timestampDiff with the same future date but different starting dates if you want: // Returns a function const diff = timestampDiff(Date.parse("Aug 1, 2022, 10:00:00")); // That we can reuse... const diffWithNow = diff(DateNow()); const diffWithYesterday = diff(Date.parse("July 30, 2022, 10:00:00")); Enter fullscreen mode Exit fullscreen mode The same happens with timer, you can start the timer with any date compared to now, and then set as many elements as you want to have the same timer on it, not just one :D The syntax of timestampDiff is doing the same thing, but with a map instead of multiple functions. My first approach was pretty similar to what the author has: const diff = future - now; // The same floor 4 times const totalDays = Math.floor(diff / DAY); const totalHours = Math.floor(diff / HOUR); const totalMinutes = Math.floor(diff / MINUTE); const totalSeconds = Math.floor(diff / SECOND); // The same logic 4 times again const days = totalDays; const hours = totalHours - totalDays * 24; const minutes = totalMinutes - totalHours * 60; const seconds = totalSeconds - totalMinutes * 60; // And we return a quadruple (array with 4 values) return [days, hours, minutes, seconds]; Enter fullscreen mode Exit fullscreen mode As you can see, we have a pattern that keeps on repeating. My approach takes the original 4 values and maps them into the quadruple. Here is with comments to make it easier to understand: // `time` will have the value of every "time unit" // `index` is self explanatory // `times` is the original quadruple. [DAY, HOUR, MINUTE, SECOND].map((time, index, times) => { // We save the diff between future and past to reuse it const diff = future - past; // We also save the previous time unit (if we are in HOUR, then is DAY // if we are in DAY then is `undefined` const previousTime = times[index - 1]; // This is the logic that was repeated 4 times previously return ( Math.floor(diff / time) - // This will return `NaN` for DAY, so we turn it into a `0` (Math.floor(diff / previousTime) * (previousTime / time) || 0) ); }) Enter fullscreen mode Exit fullscreen mode You can now add a milliseconds unit, for example, and have a more detailed countdown if you want, by just changing the initial tuple. Like comment: Like comment: 1 like Thread Thread Robin Schambach Follow Joined Aug 1, 2021 • Dropdown menu Hide I see thank you for your detailed explanation. Maybe I should have asked my question in a different way 😅 I know that pattern but I don't like it that much. The question should be more like "I don't get the advantage over calling one single method with multiple arguments" as it requires less memory in larger scales. When you have a loop or use this pattern in a recursion I think it's not worth it (of course in this case without something else it is trivial). If I really need such a case I prefer classes over that pattern as it's easier to read at the very first glance (when you have to dig through several hundred lines of code within a few seconds) I guess it all depends on person preferences and what people are used too. Then again thanks for your code I bet it helps many people. Like comment: Like comment: 2 likes Thread Thread LUKESHIRU Follow Dev and gamer 🛡️ Trusted User Location Bellevue, Washington Work Senior Software Engineer at VMWare Joined Jul 25, 2018 • Dropdown menu Hide Is definitely a preference thing. I write mainly unary functions and default to currying almost always. Not to mention that and I luckily haven't had the need to use them in a very long time :D Like comment: Like comment: 1 like Collapse Expand ashad nasim Follow Joined Nov 9, 2019 • Dropdown menu Hide Great Aritcle, It is good to clear the timer of the interval using clearInterval() Full Code To clear interval in React let timerCount = null; useEffect(() => { timerCount = setInterval(() => { _countDown(); }, 1000); return () => { clearInterval(timerCount); }; }, []); Enter fullscreen mode Exit fullscreen mode Like comment: Like comment: 2 likes Collapse Expand Chris ☕️ Follow Front end Web developer 💻 I love to solve problems, think creatively, write code, and learn new things. Location Colorado, USA Joined Jul 28, 2021 • Dropdown menu Hide Looks good to me! Thank you for the tutorial 👍 Like comment: Like comment: 3 likes Collapse Expand Foolish Developer Follow Joined May 7, 2021 Author • Dropdown menu Hide Welcome 😀 Like comment: Like comment: 2 likes Collapse Expand Cyril Kariyawasam Follow Work Selftaught Programmer Joined Jul 4, 2021 • Dropdown menu Hide Thanks. Very helpful. Like comment: Like comment: 2 likes • Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's . Hide child comments as well Confirm For further actions, you may consider blocking this person and/or Read next
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Simple Countdown Timer using JavaScript

9 hours ago

• Step 1: Design the web page with CSS Step 1: Design the web page with CSSUsing the codes below, I changed the background color of the webpage and some basics. Here I have used background-color # 90cbf3 and font-family: sans-serif. Here I have used padding: 100px 50px which will place these boxes in the middle of the HTML page.body {    text-align: center;    padding: 100px 50px;    background: #90cbf3;    font-family: sans-serif;    font-weight: lighter;}  In this case, only a small amount of one-line HTML code has been used.<div id="timer"></div>
• Step 2: Implement it using JavaScript Step 2: Implement it using JavaScriptThis time we will execute this countdown clock using JavaScript code. Using everyone's first Date.parse ("jun 12, 2022 01:30:00") I set a specific date, which means that this countdown clock will continue until any date. Here you have to set a specific date, month, and time.future = Date.parse("jun 12, 2022 01:30:00"); In this case, I have used new Date () to receive time from the device.We subtract the present time with the pre-determined time (diff = future - now) and store it in a constant called biff. Now we have got a specific value i.e. how many days, how many hours, how many seconds you will be able to reach at your pre-determined time.    now = new Date();    diff = future - now;I used Math.floor to calculate how many hours, minutes, and seconds it would take to reach the set date. For I have divided the biff's stand into seconds, minutes, hours, and days. We know that one second is equal to 1000 milliseconds. One minute is equal to 60 seconds, that is, one minute is equal to 1000 * 60 milliseconds. In the same way, 60 minutes is equal to 1 hour i.e. one hour is equal to 1000 * 60 * 60 milliseconds. In the same way, 24 hours is equal to one day so one day is equal to 1000 * 60 * 60 * 24 milliseconds.     days = Math.floor(diff / (1000 * 60 * 60 * 24));    hours = Math.floor(diff / (1000 * 60 * 60));    mins = Math.floor(diff / (1000 * 60));    secs = Math.floor(diff / 1000); Now I have found the final time of hours, minutes, and seconds in the diff, respectively.    d = days;    h = hours - days * 24;    m = mins - hours * 60;    s = secs - mins * 60; We have done all the important work above, now we will only show these times on the HTML page. For this, I used 'innerHTML' and then I formatted how it can be seen on the webpage.    document.getElementById("timer")        .innerHTML =        '<div>' + d + '<span>Days</span></div>' +        '<div>' + h + '<span>Hours</span></div>' +        '<div>' + m + '<span>Minutes</span></div>' +        '<div>' + s + '<span>Seconds</span></div>';}  Now I have been instructed to update this time every 1 second or 1000 milliseconds using setInterval. Because the time will change here every second, so in this case, you have to update these calculations every second.setInterval('updateTimer()', 1000);
• Step 3: Design it using CSS code Step 3: Design it using CSS codeAbove we have implemented the JavaScript countdown clock. Now we will design it using only CSS code. First I divided these times into four boxes. I used background: # 020b43 and border: 2px solid # 030d52 in the boxes. I used margin: 15px to keep some distance from each other.#timer {    font-size: 3em;    font-weight: 100;    color: white;    padding: 20px;    width: 700px;    color: white;    }#timer div {    display: inline-block;    min-width: 90px;    padding: 15px;    background: #020b43;    border-radius: 10px;    border: 2px solid #030d52;    margin: 15px;}  Now I have designed the texts in this countdown timer. As you can see above these tests are much larger in size so in this case I have determined their specific size and color. In this case I have used font-size: .35em and color: #ffffff.#timer div span {    color: #ffffff;    display: block;    margin-top: 15px;    font-size: .35em;    font-weight: 400;} Hopefully from this tutorial, you have learned how to build a countdown timer with the help of JavaScript code. In the meantime, I have shown many more types of JavaScript projects like Digital Clock, Analog Clock, Calculator, etc. You can follow those tutorials if you want. Download Code Tags Share to other apps Simple Countdown Timer using JavaScript Best_JavaScript

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