* * For the full copyright and license information, please read the LICENSE * file that was distributed with this source code. */ namespace Ivory\GoogleMap\Helper\Extension; /** * Abstract extension. * * @author GeLo */ abstract class AbstractExtensionHelper implements ExtensionHelperInterface { /** * Renders a library. * * @param string $source The library source. * @param string|null $callback The javascript callback. * * @return string The HTML output. */ protected function renderLibrary($source, $callback = null) { if ($callback === null) { return sprintf(''.PHP_EOL, $source); } $output = array(); $output[] = 'var s = document.createElement("script");'.PHP_EOL; $output[] = 's.type = "text/javascript";'.PHP_EOL; $output[] = 's.async = true;'.PHP_EOL; $output[] = sprintf('s.src = "%s";'.PHP_EOL, $source); $output[] = sprintf('s.addEventListener("load", function () { %s(); }, false);'.PHP_EOL, $callback); $output[] = 'document.getElementsByTagName("head")[0].appendChild(s);'.PHP_EOL; return implode('', $output); } }