Custom JavaScript examples

[admin]

Small example: play a beep sound each time 1/1/1 value is set to true. Note that it will only work with the upcoming firmware.

Code:

$(function(){
  var locked;

  var ctx = new(window.AudioContext ||
      window.webkitAudioContext ||
      window.mozAudioContext ||
      window.oAudioContext ||
      window.msAudioContext);

  function beep(duration, freq, cb) {
    var osc = ctx.createOscillator();
    osc.frequency.value = freq;
    osc.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 of 1/1/1 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
  */
  grp.listen('1/1/1', function(object, state) {
    if (state == 'value' && object.value && !locked) {
      locked = true;
      beep(200, 432, function() {
        locked = false;
      });
    }
  }, true);
});