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NASA Quindar tones in Web Audio

A Pen By Ed Ball Pro

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HTML

            
              <div class="wrapper">
  <p>Click and hold the button. At the start you'll hear the intro beep, and when you release the mouse you'll hear the outro beep.</p>
  <div class='button' id='js-quindar-button'>Quindar Toggle</div>
</div>
!

CSS

            
              @import url(https://fonts.googleapis.com/css?family=Karla:400);

body{
  background: #f8f8f8;
  font-family:Karla, sans-serif;
}

.wrapper{
	width:400px;
	height:200px;
	position:absolute;
	left:50%;
	top:50%;
	margin:-100px 0 0 -200px;
  text-align:center;
}

.wrapper p {
  max-width:320px;
  margin: 10px auto;
}

.button{
  font-size: 24px;
  border: solid 1px #333;
  width:200px;
  border-radius:3px;
  padding:15px;
  transition: all 0.5s;
  margin:0 auto 40px;
}

.button:hover{
  color: #55D43F;
  border-color:#55D43F;
  transition-duration:0s;
  cursor:pointer;
}

.button:active{
  color: #3CD9FD;
  border-color:#3CD9FD;
}
!

JS

            
              // polyfill
var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;


function Quindar(context) {
	this.context = context;
	this.broadcastStatus = 0;
	this.introFreq = 2525;
	this.outroFreq = 2475;
}

Quindar.prototype.setup = function(){
	this.osc = context.createOscillator();

	this.gainNode = this.context.createGain();
	this.gainNode.gain.value = 0.2;

	this.osc.connect(this.gainNode);
	this.gainNode.connect(context.destination);
}

Quindar.prototype.playSound = function(frequency){
  this.setup();
  this.osc.frequency.value = frequency;
	this.osc.start(0);
  this.osc.stop(this.context.currentTime + 0.25);
}

Quindar.prototype.beginBroadcast = function(){
  this.playSound(this.introFreq);
	this.broadcastStatus = 1;
}

Quindar.prototype.endBroadcast = function(){
  this.playSound(this.outroFreq);
	this.broadcastStatus = 0;
}

var context = new AudioContext();

// Create a new Tone instace.
var quindar = new Quindar(context);

$("#js-quindar-button").on("mousedown touchstart", function(e){
	e.preventDefault();

	if (quindar.broadcastStatus == 0){
		quindar.beginBroadcast();
	}
});

// we detect the mouseup event on the window tag as opposed to the button
// because otherwise if we release the mouse when not over the button,
// the tone will remain playing
$(window).on("mouseup touchend", function(){
	if (typeof quindar !== "undefined" && quindar.broadcastStatus == 1){
	  	quindar.endBroadcast();
	}
});
!
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