Basic MODx Snippet for Selectively Adding JS or CSS

MODx Selective JS or CSS

<?php
/** 
Parameters:

Required:
$filePath = specify the path of the stylesheet or js file.

Optional:
&fileType = css or js
&runLocation = (default is head), user can specify ending of body tag
&preComment = String of Desired Comment to be placed before file is added

**/

//Required Parameter
$filePath = $modx->getOption('filePath', $scriptProperties);

//User specify run location
$runLocation = $modx->getOption('runLocation', $scriptProperties, 'head');

//REGEX match function to search in string
preg_match('/\.css|\.js/', $filePath, $match);

$fileType = $match[0];

$preComment = $modx->getOption('preComment', $scriptProperties);
$noComment = $modx->getOption('noComment', $scriptProperties);


$comment = $preComment; 

echo $comment;

if (empty($preComment)) {
  //Based on file extension define a comment
  switch ($fileType) {
	  case '.js':
		  $comment = '<!--Page Specific JS File -->';
		  break;
	  case '.css':
		  $comment = '<!--Page Specific CSS File -->';
		  break;
	  //non-traditional extension
	  default:
		  $comment = '<!--Page Specific File -->';
		  break;
  }
 }

echo $comment;

//commentEcho Function
function commentHead() {
	global $comment;
	global $modx;
	if (empty($noComment)) {
		$modx->regClientStartupHTMLBlock($comment);
	}
}

function commentBody() {
	global $comment;
	global $modx;
	if (empty($noComment)) {
		$modx->regClientHTMLBlock($comment);
	}
}

//Determine runLocation, if body run JS before body
if ($runLocation == 'body') {
	switch ($fileType) { 
		case '.js':
			commentBody();
			$modx->regClientScript($filePath);
			break;
		//Place CSS call in head, it shouldn't be placed in body
		case '.css':
			commentHead();
			$modx->regClientCSS($filePath);
			break;
	}
} else {
	switch ($fileType) {
		case '.js':
			commentHead();
			$modx->regClientStartupScript($filePath);
			break;
		case '.css':
			commentHead();
			$modx->regClientCSS($filePath);
			break;
	}
}