public function script()
{
$data = $this->fillColor($this->data);
$data = json_encode($data);
$options = json_encode($this->options);
return <<<EOT
(function() {
var canvas = \$("#{$this->elementId}").get(0).getContext("2d");
var chart = new Chart(canvas).Bar({$data}, {$options});
})();
EOT;
}