Untitled

//Here's the object I'm trying to JSON.stringify

var collection = function () {
  this.keys = [];
  this.events = [];

  var timer;
  var starttime;
  var stoptime;

  var key_definition = function () {
    return {
      id: -1,
      label: null,
      description: null,
      letter: null,
      position: -1,
      type: -1
    };
  }

  this.newkey = function(id0, label0, description0, letter0, position0, type0) {
      this.keys.push(key_definition());
      var key = this.keys[this.keys.length-1];
      key.id = id0;
      key.label = label0;
      key.description = description0;
      key.letter = letter0;
      key.position = position0;
      key.type = type0;
    }

    var event_definition = function() {
    	    //this.eventstream.push({event: this.element.buttondefinition,type: this.element.buttontype,state: this.element.buttonstate,time: ms_time});

    	    return {
    	    	    time: -1,
    	    	    buttonid: -1,
    	    	    state: -1 //0 off, 1 on
    	    };
    }

    this.newevent = function(time0, id0, state0) {
    	    console.log("newevent");
    	    this.events.push(event_definition());
    	    var event = this.events[this.events.length-1];
    	    event.time = time0;
    	    event.id = id0;
    	    event.state = state0;
    }
};

var cc = new collection();

Here's the section where i try to stringify it:


var str;

		str = "<body>";

		str += "<a href=selectkey.php?collectscreen=1><p>Reload</p></a>";
		str += "<a href=selectkey.php><p>Select Key File</p></a>";
		str += "<p>data</p><hr>\n";
		for (var i = 0; i < cc.events.length; i++) {
			str += cc.events[i].time + " " + cc.keys[cc.events[i].id].label + " " + cc.events[i].id + " " + cc.events[i].state + "<br>\n";
  		}
		str += "<p><hr>";
		str += JSON.stringify(cc);
  		str += "</body>";

		document.write(str);