Un snippet qui ajoute des lignes dans le header

<?php

//Add js and css stuff in front end
	//taken form eform
	//author Jaelle Jabber => Tobyl
	
	function efLoadTemplate($key){
		global $modx;
		if( strlen($key)>50 ) return $key;
		$tpl = false;
		if( is_numeric($key) ) { //get from document id
			//try unpublished docs first
			$tpl = ( $doc=$modx->getDocument($key,'content',0) )? $doc['content'] :false;
			if(!$tpl )
				$tpl = ( $doc=$modx->getDocument($key,'content',1) )? $doc['content'] : false;

		}elseif( $key ){
			$tpl = ( $doc=$modx->getChunk($key) )? $doc : false;
			//try snippet if chunk is not found
			if(!$tpl) $tpl = ( $doc=$modx->runSnippet($key) )? $doc : false;
		}
		return $tpl;
		
	}


	# registers css and/or javascript to modx class
	function efRegisterStartupBlock($src_array,$noScript=false){
	global $modx;
	
	if(!array($src_array)) return;

		foreach($src_array as $item){
			list($src,$type) = $item;
			//skip scripts if told to do so
			if($type=='javascript' && $noScript) continue;
			//try to load from document or chunk
			if( $tmp = $this->efLoadtemplate($src) )
				$src = $tmp;
			
			$src=trim($src);

 		if ( $type=='css' )
			$modx->regClientCSS($src);
		elseif ( $type == 'javascript' )
			$modx->regClientStartupScript($src);
		else
			$modx->regClientStartupHTMLBlock($src);

		}//end foreach
	
	}

<?php
//En debut de script

//JS and CSS stuff taken form eform author Jaelle Jabber A.K.A tobyl
//added eFormCSS and eFormJS parameters
	//these will be added to the HEAD section of the document when the form is displayed!
if($cssStyle){
		$cssStyle = ( strpos($cssStyle,',') && !strpos($cssStyle,'<style') ) ? explode(',',$cssStyle) : array($cssStyle);
		foreach( $cssStyle as $tmp ) $startupSource[]= array($tmp,'css');
}
if($jScript){
		$jScript = ( strpos($jScript,',') && !strpos($jScript,'<script') ) ? explode(',',$jScript) : array($jScript);
		foreach( $jScript as $tmp )
		$startupSource[]= array($tmp,'javascript');
}

//et enfin

	//register css and/or javascript
	if(isset($startupSource) ) $tveditor->functions->efRegisterStartupBlock($startupSource);
	

// Pour du CSS
$modx->regClientCSS($src);

// Pour du javascript
$modx->regClientStartupScript($src);

// Pour du HTML en général
$modx->regClientStartupHTMLBlock($src);