cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <div class="wrapper">
  <ul class='dtmf-interface js-dtmf-interface'>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
    <li>7</li>
    <li>8</li>
    <li>9</li>
    <li>*</li>
    <li>0</li>
    <li>#</li>
  </ul>
</div>
            
          
!
            
              @import url(https://fonts.googleapis.com/css?family=Karla:400);

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

.wrapper{
	width:250px;
	height:310px;
	position:absolute;
	left:50%;
	top:50%;
	margin:-155px 0 0 -125px;
  text-align:center;
}


.dtmf-interface{
  width:250px;
  margin:0;
  padding:0;
  overflow:hidden;
}

.dtmf-interface li{
  float:left;
  margin:10px;
  list-style:none;
  width:30px;
  height:30px;
  text-align:center;
  line-height:30px;
  font-size: 24px;
  border: solid 1px #333;
  border-radius:3px;
  padding:15px;
  transition: all 0.5s;
}

.dtmf-interface li:hover{
  color: #3CD9FD;
  border-color:#3CD9FD;
  transition-duration:0s;
  cursor:pointer;
}

.dtmf-interface li:active{
  color: #F60;
  border-color:#F60;
  transition-duration:0s;
}
            
          
!
            
              // polyfill
var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;

function Tone(context, freq1, freq2) {
	this.context = context;
	this.status = 0;
	this.freq1 = freq1;
	this.freq2 = freq2;
}

Tone.prototype.setup = function(){
	this.osc1 = context.createOscillator();
	this.osc2 = context.createOscillator();
	this.osc1.frequency.value = this.freq1;
	this.osc2.frequency.value = this.freq2;

	this.gainNode = this.context.createGain();
	this.gainNode.gain.value = 0.25;

	this.filter = this.context.createBiquadFilter();
	this.filter.type = "lowpass";
	this.filter.frequency = 8000;

	this.osc1.connect(this.gainNode);
	this.osc2.connect(this.gainNode);

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

Tone.prototype.start = function(){
	this.setup();
	this.osc1.start(0);
	this.osc2.start(0);
	this.status = 1;
}

Tone.prototype.stop = function(){
	this.osc1.stop(0);
	this.osc2.stop(0);
	this.status = 0;
}

var dtmfFrequencies = {
	"1": {f1: 697, f2: 1209},
	"2": {f1: 697, f2: 1336},
	"3": {f1: 697, f2: 1477},
	"4": {f1: 770, f2: 1209},
	"5": {f1: 770, f2: 1336},
	"6": {f1: 770, f2: 1477},
	"7": {f1: 852, f2: 1209},
	"8": {f1: 852, f2: 1336},
	"9": {f1: 852, f2: 1477},
	"*": {f1: 941, f2: 1209},
	"0": {f1: 941, f2: 1336},
	"#": {f1: 941, f2: 1477}
}

var context = new AudioContext();

// Create a new Tone instace. (We've initialised it with 
// frequencies of 350 and 440 but it doesn't really matter
// what we choose because we will be changing them in the 
// function below)
var dtmf = new Tone(context, 350, 440);

$(".js-dtmf-interface li").on("mousedown touchstart", function(e){
	e.preventDefault();

	var keyPressed = $(this).html(); // this gets the number/character that was pressed
	var frequencyPair = dtmfFrequencies[keyPressed]; // this looks up which frequency pair we need

	// this sets the freq1 and freq2 properties
	dtmf.freq1 = frequencyPair.f1;
	dtmf.freq2 = frequencyPair.f2;

	if (dtmf.status == 0){
		dtmf.start();
	}
});

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


            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................

Console