====== TPL_METAHEADER_OUTPUT ======

---- dataentry event ----
Description:    Manipulate meta headers
DefaultAction:  Sends the meta headers to the browser
Preventable:    yes
Added_dt:       2006-09-16
----

This event is signalled by [[xref>tpl_metaheaders()]] in [[xref>inc/template.php]] after preparing the default meta headers. You can use it to manipulate the meta headers before they're sent to the browser.

===== Passed Data =====

$data is a two-dimensional array of all meta headers. The keys are ''meta'', ''link'' and ''script''.

Here is an example for using the data property to add meta information, stylesheets and JavaScript
<code php>
// Adding a meta value
$event->data["meta"][] = [
    "name" => "DC.Subject",
    "content" => "Some information"
];

// Adding a stylesheet 
$event->data["link"][] = [
    "type" => "text/css",
    "rel" => "stylesheet", 
    "href" => DOKU_BASE . "lib/plugins/myplugin/specialstyle.css"
];

// Adding a JavaScript File
$event->data["script"][] = [
    "type" => "text/javascript",
    "src" => DOKU_BASE . "lib/plugins/myplugin/javascript_library.js",
    "_data" => ""
];

// Adding JavaScript Code
$event->data["script"][] = [
    "type" => "text/javascript",
    "charset" => "utf-8",
    "_data" => "addInitEvent(function(){comments_addButtons('$ID');});"
];
</code>
Note:
  * When you are adding the stylesheet or javascript file for compatibility with using slash as namespace separator in URLs you should prepend the file link with DOKU_BASE.
  * For adding the javascript file you should specify an empty ''_data'' field for generating of a closing "script" tag, otherwise you get an incorrect self closed "script" tag.
  * You may use other tags as well
<code php>
$event->data['style'][] = [
    'type'  => 'text/css',
    '_data' => 'a {color: blue;}'
];
</code>


===== See also =====

  * [[codesearch>TPL_METAHEADER_OUTPUT|Code related to this event]] used in any DokuWiki's files, plugins and templates
  * [[devel:Action Plugins]]
  * [[devel:Events]]