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How to create a \"coming soon page\" with CSS and JavaScript?
We will create a coming soon page with a timer. The timer is set using the setInterval() function. The time is fetched using the getTime() function.
Set the div
We have set the image as a div class. Rest, the coming soon text and the timer is placed within it −
<div class="bgimg"> <div class="middle"> <h1>COMING SOON</h1> <hr /> <h2 class="timer"></h2> </div> </div>
Place the Image
The image is now placed using the background-image property. The position is set using the background-position property"
.bgimg {
   background-image: url("https://images.pexels.com/photos/117602/pexels-photo-117602.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1");
   height: 100%;
   background-position: center;
   background-size: cover;
   position: relative;
   color: white;
   font-size: 25px;
   filter: grayscale(100%);
}
Set in the Middle
All the elements are set in the center −
.middle {
   position: absolute;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
   text-align: center;
}
The Timer
The script for the timer is as follows. It gets placed in the <script> element −
<script>
   var countDownDate = new Date("November 10, 2023 11:27:15").getTime();
   var timeClear = setInterval(function() {
      var now = new Date().getTime();
      var timeLeft = countDownDate - now;
      var days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
      var hours = Math.floor(
         (timeLeft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)
      );
      var minutes = Math.floor((timeLeft % (1000 * 60 * 60)) / (1000 * 60));
      var seconds = Math.floor((timeLeft % (1000 * 60)) / 1000);
      document.querySelector(".timer").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
      if (timeLeft < 0) {
         clearInterval(timeClear);
         document.querySelector(".timer").innerHTML = "Timer Finished";
      }
   }, 1000);
</script>
Set the Count Down
Above, we have set the date we are counting i.e. today is 5th November 2023, so the counter will go this 10th November −
var countDownDate = new Date("November 10, 2023 11:27:10").getTime();
Calculate the Distance (time left)
The time between the current date and the count down is calculated −
var countDownDate = new Date("November 10, 2023 11:27:15").getTime();
var timeClear = setInterval(function() {
   var now = new Date().getTime();
   var timeLeft = countDownDate - now;
Display a Time After the Countdown Expires
According to our example, our timer will expire on 10th November. After that, set a message −
if (timeLeft < 0) {
   clearInterval(timeClear);
   document.querySelector(".timer").innerHTML = "Timer Finished";
}
Example
To create a coming soon page with CSS and JavaScript, the code is as follows −
<!DOCTYPE html>
<html>
<head>
   <style>
      body {
         height: 100vh;
         font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
         margin: 0;
      }
      h1, h2 {
         background-color: black;
        opacity: 0.5;
      }
      .timer {
         text-align: center;
         font-size: 60px;
         margin-top: 0px;
         color: white;
      }
      .bgimg {
         background-image: url("https://images.pexels.com/photos/117602/pexels-photo-117602.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1");
         height: 100%;
         background-position: center;
         background-size: cover;
         position: relative;
         color: white;
         font-size: 25px;
         filter: grayscale(100%);
      }
      .middle {
         position: absolute;
         top: 50%;
         left: 50%;
         transform: translate(-50%, -50%);
         text-align: center;
      }
      hr {
         margin: auto;
         width: 40%;
      }
   </style>
</head>
<body>
   <div class="bgimg">
      <div class="middle">
         <h1>COMING SOON</h1>
         <hr />
         <h2 class="timer"></h2>
      </div>
   </div>
   <script>
      var countDownDate = new Date("June 5, 2022 11:27:15").getTime();
      var timeClear = setInterval(function() {
         var now = new Date().getTime();
         var timeLeft = countDownDate - now;
         var days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
         var hours = Math.floor(
            (timeLeft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)
         );
         var minutes = Math.floor((timeLeft % (1000 * 60 * 60)) / (1000 * 60));
         var seconds = Math.floor((timeLeft % (1000 * 60)) / 1000);
         document.querySelector(".timer").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
         if (timeLeft < 0) {
            clearInterval(timeClear);
            document.querySelector(".timer").innerHTML = "Timer Finished";
         }
      }, 1000);
   </script>
</body>
</html>
