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Zenon Page Templates - JS (ZPT-JS)
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<title>ZPT-JS reference - Attributes - METALUseMacro</title>
<script type="module" src="../js/zpt.js"></script>
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<link rel="stylesheet" type="text/css" href="../docs.css">
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<div data-use-macro="'page@templates.html'">
<div data-fill-slot="'page-header'">
<h1>ZPT-JS reference - Attributes - METALUseMacro</h1>
<ul>
<li><a href="#syntax">Syntax</a>.</li>
<li><a href="#description">Description</a>.</li>
<li><a href="#differences">Differences with ZPT</a>.</li>
<li><a href="#examples">Examples</a>.</li>
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<h2 data-attributes="id 'syntax'">Syntax</h2>
<pre class="syntax">
argument ::= expression
</pre>
<h2 data-attributes="id 'description'">Description</h2>
<p>
The <em>data-use-macro</em> statement replaces the statement element with a macro. The statement expression describes a macro definition.
</p>
<p>
In ZPT-JS the expression will generally be a path expression referring to a macro defined in another template. See <a href="attributes-METALDefineMacro.html">data-define-macro</a> for more information.
</p>
<p>
The effect of expanding a macro is to graft a subtree from another document (or from elsewhere in the current document) in place of the statement element, replacing the existing sub-tree. Parts of the original subtree may remain, grafted onto the new subtree, if the macro has slots. See <a href="attributes-METALDEfineSlot.html">data-define-slot</a> for more information.
</p>
<p>
Note: some parts extracted from <a href="https://zope.readthedocs.io/en/latest/zopebook/AppendixC.html#define-macro-define-a-macro">Zope Page Templates Reference</a>.
</p>
<h2 data-attributes="id 'differences'">Differences with ZPT</h2>
<ul>
<li>
In ZPT the syntax is <em>argument ::= Name</em>, so all invokations are literals. ZPT-JS uses expressions.
</li>
<li>
Syntax of external macro invokation.
</li>
<li>
There is no Zope tree in which to locate templates.
</li>
</ul>
<h2 data-attributes="id 'examples'">Examples</h2>
<p>
Invokation of <em>copyright</em> macro in the same file (internal macro invokation):
</p>
<pre class="brush: html">
<p data-use-macro="'copyright'">
Macro goes here
</p>
</pre>
<p>
Invokation of <em>copyright</em> macro in <em>macros.html</em> file (external macro invokation):
</p>
<pre class="brush: html">
<p data-use-macro="'copyright@macros.html'">
Macro goes here
</p>
</pre>
<p>
Invokation of macro defined by <em>macroPath</em> variable (it can be an internal or external macro invokation):
</p>
<pre class="brush: html">
<p data-use-macro="macroPath">
Macro goes here
</p>
</pre>
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