Goal

In this example, we want to be able to render page-specific meta tags without requiring page authors to add dekiscript code (eg: meta.custom) in the page content.  Instead, we'd like to rely on specially-named page properties (ex: name: "meta-mytag", text: "mytext").  A template will then iterate over all page properties and call meta.custom() for each meta-* property.

Meta Template

Create a new page at /Template:Meta with the following content.  Make sure you use a formatted region and apply the Dekiscript style.

var pg = wiki.getpage(num.cast(__request.args.pageid));
foreach(var property in pg.properties) {
     if (string.startswith(property.name, "meta-")) {
        meta.custom(string.substr(property.name, 5), property.text);
    }
}

As you can see, this code is pretty simple.  We lookup the current page by id, iterate over the properties to find any property named meta-*, then render that tag using the meta.custom() dekiscript function.

Global Template

Create a global template at /Template:GlobalTemplate with the following content.   Make sure you use a formatted region and apply the Dekiscript style.

wiki.template("Meta");

Add GlobalTemplate to wgPreloadPages array

In order for the GlobalTemplate to be invoked on each page load, you must add it to the $wgPreloadPages array in LocalSettings.php.  Add the following code in LocalSettings.php

$wgPreloadPages = array('Template:GlobalTemplate');