play beep on specific plan - Printable Version

Code:

$(function(){  

  var context= new AudioContext();
  
function jsNota(frecuencia){
        var o= context.createOscillator();
        g=context.createGain();
        o.connect(g);
        o.type="sine";
        o.frequency.value=frecuencia;
        g.connect(context.destination);
        o.start(0);
        g.gain.exponentialRampToValueAtTime(0.00001,context.currentTime +1.5);
    }
grp.listen('1/1/1', function(object, state) {
    if (state == 'value' && object.value ) {
      jsNota(1174.659, function() {
      });
    }
  }, true);
  
  });

Code:

$(function(){
  var locked;
  var ctx = new(window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.oAudioContext || window.msAudioContext);
  var Beeping;
  
  function beep(duration, freq, vol, cb) {
    var osc = ctx.createOscillator();
    osc.frequency.value = freq;
    var volumeNode = ctx.createGain();
    volumeNode.gain.value = (vol/1000);
    osc.connect(volumeNode);
    volumeNode.connect(ctx.destination);    
    osc.start ? osc.start(0) : osc.noteOn(0);
    setTimeout(function () {
    osc.disconnect();
    if (typeof cb == "function") {
     cb();
    }
   }, duration);
  }
  
  /* beep each time value is true note that 3rd listen parameter must be set to true to execute the callback each time new value arrives otherwise callback is executed only when value changes */
  function startbeep(){
    var ChromeDelay = 0;
    if (document.hidden && !!window.chrome){
      ChromeDelay = 1500;
    }
    setTimeout(function(){
      if (!locked) {
        locked = true;
        // duration , freq
        beep(300, 1500, 50, function() {
          locked = false;
        });
      }
    }, ChromeDelay);
  }  

  // Function to start beep interval
  function StartBeepTimer(){
    // Jump to correct page
    //showPlan(3);
    // Set delay timer to start after x seconds
    setTimeout(function(){
      // Start feedback polling every second
      if (!Beeping) {
        // Run once to bypass the first delay
        startbeep();
        Beeping = setInterval(function(){ startbeep(); }, 2000);
      }
    }, 50); // Set higher value then 50 for extra delay after stop and start beep
  }

  // Function to stop beep interval
  function StopBeepTimer(){
    // Stop feedback polling every second
    if (Beeping) {
      clearInterval(Beeping);
    }
    Beeping = null;
  }
  
  // Creta elistener to start audio beep
  grp.listen('21/0/1', function(object, state) {
    if (state == 'value' && object.value ) {
       StartBeepTimer();
    } else if( state == 'value' && object.value == false){
        StopBeepTimer();
    }
  }, true);
   
});