code-boxx/0-JS-COUNTDOWN.MD

## 0-JS-COUNTDOWN.MD

      
    Raw
  

              0-JS-COUNTDOWN.MD
            
          
    JAVASCRIPT COUNTDOWN TIMER

https://code-boxx.com/simple-javascript-countdown-timer/
LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1-simple.html
<!DOCTYPE html>
<html>
  <head>
    <title>Countdown Timer</title>

    <!-- (A) LOAD LIBRARY & THEME -->
    <link href="countdown-dark.css" rel="stylesheet">
    <script src="countdown.js"></script>
  </head>
  <body>
    <!-- (B) GENERATE COUNTDOWN TIMER HERE -->
    <div id="demoA"></div>

    <!-- (C) ATTACH COUNTDOWN TIMER -->
    <script>
    counter.attach({
      target : document.getElementById("demoA"),
      remain : 5400 // 90 mins = 5400 secs
    });
    </script>
  </body>
</html>

## 2-on-end.html
<!DOCTYPE html>
<html>
  <head>
    <title>Countdown Timer</title>

    <!-- (A) LOAD LIBRARY & THEME -->
    <link href="countdown-dark.css" rel="stylesheet">
    <script src="countdown.js"></script>
  </head>
  <body>
    <!-- (B) GENERATE COUNTDOWN TIMER HERE -->
    <div id="demoB"></div>

    <!-- (C) ATTACH COUNTDOWN TIMER -->
    <script>
    counter.attach({
      target : document.getElementById("demoB"),
      remain : 65,
      after : () => console.log("TIMER HAS ENDED!")
    });
    </script>
  </body>
</html>

## 3-to-date.html
<!DOCTYPE html>
<html>
  <head>
    <title>Countdown Timer</title>

    <!-- (A) LOAD LIBRARY & THEME -->
    <link href="countdown-light.css" rel="stylesheet">
    <script src="countdown.js"></script>
  </head>
  <body>
    <!-- (B) GENERATE COUNTDOWN TIMER HERE -->
    <div id="demoC"></div>

    <!-- (C) ATTACH COUNTDOWN TIMER -->
    <script>
    // (C1) FOR THIS EXAMPLE, WE TAKE 2 DAYS FROM NOW
    // IN YOUR PROJECT THIS IS NEW DATE("YOUR TARGET DATE/TIME")
    var till = new Date(Date.now() + 172800000);

    // (C2) COUNTDOWN
    counter.attach({
      target : document.getElementById("demoC"),
      remain : counter.toSecs(till)
    });
    </script>
  </body>
</html>

## countdown-dark.css
/* (A) WRAPPER */
.countdown * {
  font-family: Impact, sans-serif;
  box-sizing: border-box;
  text-align: center;
}
.countdown {
  display: flex;
  margin: 0 auto;
  max-width: 450px;
  background: #000;
}

/* (B) DAY/HR/MIN/SEC CELLS */
.countdown .cell {
  flex-grow: 1;
  flex-basis: 0;
  padding: 10px;
}
.countdown .digits {
  font-size: 24px;
  color: #000;
  background: #fff;
  padding: 10px;
  border-radius: 5px;
}
.countdown .text {
  margin-top: 10px;
  color: #ddd;
}

/* (C) IF YOU WANT TO SPECIFICALLY STYLE THE DAY/HR/MIN/SEC
.countdown .days { }
.countdown .hours { }
.countdown .minutes { }
.countdown .seconds { }
*/

## countdown-light.css
/* (A) WRAPPER */
.countdown * {
  font-family: Impact, sans-serif;
  box-sizing: border-box;
  text-align: center;
}
.countdown {
  display: flex;
  margin: 0 auto;
  max-width: 450px;
  background: #f2f2f2;
}

/* (B) DAY/HR/MIN/SEC CELLS */
.countdown .cell {
  flex-grow: 1;
  flex-basis: 0;
  padding: 10px;
}
.countdown .digits {
  font-size: 24px;
  color: #ff3f6b;
  background: #fff;
  padding: 10px;
  border-radius: 5px;
}
.countdown .text {
  margin-top: 10px;
  color: #1e1e1e;
}

/* (C) IF YOU WANT TO SPECIFICALLY STYLE THE DAY/HR/MIN/SEC
.countdown .days { }
.countdown .hours { }
.countdown .minutes { }
.countdown .seconds { }
*/

## countdown.js
var counter = {
  // (A) HELPER - CREATE HR/MIN/SEC CELL
  //  txt : text for the cell (all small letters)
  square : txt => {
    let cell = document.createElement("div");
    cell.className = `cell ${txt}`;
    cell.innerHTML = `<div class="digits">0</div><div class="text">${txt}</div>`;
    return cell;
  },

  // (B) INITIALIZE COUNTDOWN TIMER
  //  target : target html container
  //  remain : seconds to countdown
  //  after : function, do this when countdown end (optional)
  attach : instance => {
    // (B1) GENERATE HTML
    instance.target.className = "countdown";
    if (instance.remain >= 86400) {
      instance.target.appendChild(counter.square("days"));
      instance.days = instance.target.querySelector(".days .digits");
    }
    if (instance.remain >= 3600) {
      instance.target.appendChild(counter.square("hours"));
      instance.hours = instance.target.querySelector(".hours .digits");
    }
    if (instance.remain >= 60) {
      instance.target.appendChild(counter.square("mins"));
      instance.mins = instance.target.querySelector(".mins .digits");
    }
    instance.target.appendChild(counter.square("secs"));
    instance.secs = instance.target.querySelector(".secs .digits");

    // (B2) TIMER
    instance.timer = setInterval(() => counter.ticker(instance), 1000);
  },

  // (C) COUNTDOWN TICKER
  ticker : instance => {
    // (C1) TIMER STOP
    instance.remain--;
    if (instance.remain<=0) {
      clearInterval(instance.timer);
      instance.remain = 0;
      if (typeof instance.after == "function") { instance.after(); }
    }

    // (C2) CALCULATE REMAINING DAYS/HOURS/MINS/SECS
    // 1 day = 60 secs * 60 mins * 24 hrs = 86400 secs
    // 1 hr = 60 secs * 60 mins = 3600 secs
    // 1 min = 60 secs
    let secs = instance.remain;
    let days = Math.floor(secs / 86400);
    secs -= days * 86400;
    let hours = Math.floor(secs / 3600);
    secs -= hours * 3600;
    let mins  = Math.floor(secs / 60);
    secs -= mins * 60;

    // (C3) UPDATE HTML
    instance.secs.innerHTML = secs;
    if (instance.mins !== undefined) { instance.mins.innerHTML = mins; }
    if (instance.hours !== undefined) { instance.hours.innerHTML = hours; }
    if (instance.days !== undefined) { instance.days.innerHTML = days; }
  },

  // (D) HELPER - CONVERT DATE/TIME TO REMAINING SECONDS
  //  till : (date object) countdown to this date/time
  toSecs : till => {
    till = Math.floor(till / 1000);
    let remain = till - Math.floor(Date.now() / 1000);
    return remain<0 ? 0 : remain;
  }
};
	<!DOCTYPE html>
	<html>
	<head>
	<title>Countdown Timer</title>

	<!-- (A) LOAD LIBRARY & THEME -->
	<link href="countdown-dark.css" rel="stylesheet">
	<script src="countdown.js"></script>
	</head>
	<body>
	<!-- (B) GENERATE COUNTDOWN TIMER HERE -->
	<div id="demoA"></div>

	<!-- (C) ATTACH COUNTDOWN TIMER -->
	<script>
	counter.attach({
	target : document.getElementById("demoA"),
	remain : 5400 // 90 mins = 5400 secs
	});
	</script>
	</body>
	</html>
	/* (A) WRAPPER */
	.countdown * {
	font-family: Impact, sans-serif;
	box-sizing: border-box;
	text-align: center;
	}
	.countdown {
	display: flex;
	margin: 0 auto;
	max-width: 450px;
	background: #000;
	}

	/* (B) DAY/HR/MIN/SEC CELLS */
	.countdown .cell {
	flex-grow: 1;
	flex-basis: 0;
	padding: 10px;
	}
	.countdown .digits {
	font-size: 24px;
	color: #000;
	background: #fff;
	padding: 10px;
	border-radius: 5px;
	}
	.countdown .text {
	margin-top: 10px;
	color: #ddd;
	}

	/* (C) IF YOU WANT TO SPECIFICALLY STYLE THE DAY/HR/MIN/SEC
	.countdown .days { }
	.countdown .hours { }
	.countdown .minutes { }
	.countdown .seconds { }
	*/
	var counter = {
	// (A) HELPER - CREATE HR/MIN/SEC CELL
	// txt : text for the cell (all small letters)
	square : txt => {
	let cell = document.createElement("div");
	cell.className = `cell ${txt}`;
	cell.innerHTML = `<div class="digits">0</div><div class="text">${txt}</div>`;
	return cell;
	},

	// (B) INITIALIZE COUNTDOWN TIMER
	// target : target html container
	// remain : seconds to countdown
	// after : function, do this when countdown end (optional)
	attach : instance => {
	// (B1) GENERATE HTML
	instance.target.className = "countdown";
	if (instance.remain >= 86400) {
	instance.target.appendChild(counter.square("days"));
	instance.days = instance.target.querySelector(".days .digits");
	}
	if (instance.remain >= 3600) {
	instance.target.appendChild(counter.square("hours"));
	instance.hours = instance.target.querySelector(".hours .digits");
	}
	if (instance.remain >= 60) {
	instance.target.appendChild(counter.square("mins"));
	instance.mins = instance.target.querySelector(".mins .digits");
	}
	instance.target.appendChild(counter.square("secs"));
	instance.secs = instance.target.querySelector(".secs .digits");

	// (B2) TIMER
	instance.timer = setInterval(() => counter.ticker(instance), 1000);
	},

	// (C) COUNTDOWN TICKER
	ticker : instance => {
	// (C1) TIMER STOP
	instance.remain--;
	if (instance.remain<=0) {
	clearInterval(instance.timer);
	instance.remain = 0;
	if (typeof instance.after == "function") { instance.after(); }
	}

	// (C2) CALCULATE REMAINING DAYS/HOURS/MINS/SECS
	// 1 day = 60 secs * 60 mins * 24 hrs = 86400 secs
	// 1 hr = 60 secs * 60 mins = 3600 secs
	// 1 min = 60 secs
	let secs = instance.remain;
	let days = Math.floor(secs / 86400);
	secs -= days * 86400;
	let hours = Math.floor(secs / 3600);
	secs -= hours * 3600;
	let mins = Math.floor(secs / 60);
	secs -= mins * 60;

	// (C3) UPDATE HTML
	instance.secs.innerHTML = secs;
	if (instance.mins !== undefined) { instance.mins.innerHTML = mins; }
	if (instance.hours !== undefined) { instance.hours.innerHTML = hours; }
	if (instance.days !== undefined) { instance.days.innerHTML = days; }
	},

	// (D) HELPER - CONVERT DATE/TIME TO REMAINING SECONDS
	// till : (date object) countdown to this date/time
	toSecs : till => {
	till = Math.floor(till / 1000);
	let remain = till - Math.floor(Date.now() / 1000);
	return remain<0 ? 0 : remain;
	}
	};