erobit/scanner.js

## scanner.js
function Scanner(id, opts, cb) {
  this.robot = false;
  this.count=0;
  this.tick = 0;
  this.total = 0;
  this.avg = 0;
  this.timer = null;

  this.callback = arguments.length == 3 ? cb : opts;
  this.opts = arguments.length == 2 ? {} : opts;
  this.scanThreshold = opts.scanThreshold || 10;
  this.timeout = opts.timeout || 3000;
  this.logger = opts.logger || false;
  this.obj = document.getElementById(id);
}

Scanner.prototype.scan = function() {
  clearTimeout(this.timer);
  this.timer = setTimeout(this.complete.bind(this), this.timeout);
  if(this.obj.value == ''){
    this.reset();
    return;
  }
  var d = new Date();
  var newTick = d.getTime();
  var diff = newTick - this.tick;
  this.count++;

  if(this.tick != 0) {
    this.total += diff;
    this.avg = this.total / this.count;
  }
  this.tick = newTick;
  this.robot = this.avg > 0 && this.avg < this.scanThreshold;
  this.log();
};

Scanner.prototype.log = function() {
  if(this.logger) {
    console.log('avg keystroke duration=' + this.avg + ', robot=' + this.robot);
  }
};

Scanner.prototype.complete = function() {
  if(this.callback != null && this.robot) {
    this.callback(this.obj.value);
  }
};

Scanner.prototype.reset = function() {
  this.count=this.tick=this.total=this.avg=0;
};
	function Scanner(id, opts, cb) {
	this.robot = false;
	this.count=0;
	this.tick = 0;
	this.total = 0;
	this.avg = 0;
	this.timer = null;

	this.callback = arguments.length == 3 ? cb : opts;
	this.opts = arguments.length == 2 ? {} : opts;
	this.scanThreshold = opts.scanThreshold \|\| 10;
	this.timeout = opts.timeout \|\| 3000;
	this.logger = opts.logger \|\| false;
	this.obj = document.getElementById(id);
	}

	Scanner.prototype.scan = function() {
	clearTimeout(this.timer);
	this.timer = setTimeout(this.complete.bind(this), this.timeout);
	if(this.obj.value == ''){
	this.reset();
	return;
	}
	var d = new Date();
	var newTick = d.getTime();
	var diff = newTick - this.tick;
	this.count++;

	if(this.tick != 0) {
	this.total += diff;
	this.avg = this.total / this.count;
	}
	this.tick = newTick;
	this.robot = this.avg > 0 && this.avg < this.scanThreshold;
	this.log();
	};

	Scanner.prototype.log = function() {
	if(this.logger) {
	console.log('avg keystroke duration=' + this.avg + ', robot=' + this.robot);
	}
	};

	Scanner.prototype.complete = function() {
	if(this.callback != null && this.robot) {
	this.callback(this.obj.value);
	}
	};

	Scanner.prototype.reset = function() {
	this.count=this.tick=this.total=this.avg=0;
	};