pixel_id = $pixel_id;
$this->user_info = $user_info;
$this->last_event = '';
}
/**
* Returns FB pixel code script part
*/
public function pixel_base_code() {
$params = self::add_version_info();
return sprintf("
",
WC_Facebookcommerce_Utils::getIntegrationName(),
$this->pixel_init_code(),
json_encode($params, JSON_PRETTY_PRINT | JSON_FORCE_OBJECT),
WC_Facebookcommerce_Utils::getIntegrationName());
}
/**
* Returns FB pixel code noscript part to avoid W3 validation error
*/
public function pixel_base_code_noscript() {
return sprintf("
",
esc_js($this->pixel_id));
}
/**
* Prevent double-fires by checking the last event
*/
public function check_last_event($event_name) {
return $event_name === $this->last_event;
}
/**
* Preferred method to inject events in a page, normally you should use this
* instead of WC_Facebookcommerce_Pixel::build_event()
*/
public function inject_event($event_name, $params, $method='track') {
$code = self::build_event($event_name, $params, $method);
$this->last_event = $event_name;
if (WC_Facebookcommerce_Utils::isWoocommerceIntegration()) {
WC_Facebookcommerce_Utils::wc_enqueue_js($code);
} else {
printf("
",
$code);
}
}
/**
* You probably should use WC_Facebookcommerce_Pixel::inject_event() but
* this method is available if you need to modify the JS code somehow
*/
public static function build_event($event_name, $params, $method='track') {
$params = self::add_version_info($params);
return sprintf(
"// %s Facebook Integration Event Tracking\n".
"fbq('%s', '%s', %s);",
WC_Facebookcommerce_Utils::getIntegrationName(),
$method,
$event_name,
json_encode($params, JSON_PRETTY_PRINT | JSON_FORCE_OBJECT));
}
private static function get_version_info() {
global $wp_version;
if (WC_Facebookcommerce_Utils::isWoocommerceIntegration()) {
return array(
'source' => 'woocommerce',
'version' => WC()->version,
'pluginVersion' => WC_Facebookcommerce_Utils::PLUGIN_VERSION
);
}
return array(
'source' => 'wordpress',
'version' => $wp_version,
'pluginVersion' => WC_Facebookcommerce_Utils::PLUGIN_VERSION
);
}
/**
* Returns an array with version_info for pixel fires. Parameters provided by
* users should not be overwritten by this function
*/
private static function add_version_info($params=array()) {
// if any parameter is passed in the pixel, do not overwrite it
return array_replace(self::get_version_info(), $params);
}
/**
* Init code might contain additional information to help matching website
* users with facebook users. Information is hashed in JS side using SHA256
* before sending to Facebook.
*/
private function pixel_init_code() {
$version_info = self::get_version_info();
$agent_string = sprintf(
'%s-%s-%s',
$version_info['source'],
$version_info['version'],
$version_info['pluginVersion']);
$params = array(
'agent' => $agent_string);
return sprintf(
"fbq('init', '%s', %s, %s);\n",
esc_js($this->pixel_id),
json_encode($this->user_info, JSON_PRETTY_PRINT | JSON_FORCE_OBJECT),
json_encode($params, JSON_PRETTY_PRINT | JSON_FORCE_OBJECT));
}
}
endif;