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Posted to notifications@freemarker.apache.org by dd...@apache.org on 2017/03/15 21:19:38 UTC
[41/51] [partial] incubator-freemarker-site git commit: 2.3.26-voting
docs, removed nightly
http://git-wip-us.apache.org/repos/asf/incubator-freemarker-site/blob/a4004324/builds/2.3.26-nightly/dgui_template_directives.html
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-<div class="col-right"><div class="page-content"><div class="page-title"><div class="pagers top"><a class="paging-arrow previous" href="dgui_template_overallstructure.html"><span>Previous</span></a><a class="paging-arrow next" href="dgui_template_exp.html"><span>Next</span></a></div><div class="title-wrapper">
-<h1 class="content-header header-section1" id="dgui_template_directives" itemprop="headline">Directives</h1>
-</div></div><a name="term.designer.directive"></a><p>You use FTL tags to call <strong>directives</strong>. In the example you have called the
- <code class="inline-code">list</code> directive. Syntactically you have done it with
- two tags: <code class="inline-code"><#list animals as animal></code> and
- <code class="inline-code"></#list></code>.</p><p>There are two kind of FTL tags:</p><ul>
- <li>
- <p>Start-tag:
- <code class="inline-code"><#<em class="code-color">directivename</em>
- <em class="code-color">parameters</em>></code></p>
- </li>
-
- <li>
- <p>End-tag:
- <code class="inline-code"></#<em class="code-color">directivename</em>></code></p>
- </li>
- </ul><p>This is similar to HTML or XML syntax, except that the tag name
- starts with <code class="inline-code">#</code>. If the directive doesn't have nested
- content (content between the start-tag and the end-tag), you must use
- the start-tag with no end-tag. For example you write <code class="inline-code"><#if
- <em class="code-color">something</em>><em class="code-color">...</em></#if></code>,
- but just <code class="inline-code"><#include
- <em class="code-color">something</em>></code> as FreeMarker knows
- that the <code class="inline-code">include</code> directive can't have nested
- content.</p><p>The format of the
- <code class="inline-code"><em class="code-color">parameters</em></code> depends on
- the
- <code class="inline-code"><em class="code-color">directivename</em></code>.</p><p>In fact there are two types of directives: <a href="gloss.html#gloss.predefinedDirective">predefined directives</a> and
- <a href="gloss.html#gloss.userDefinedDirective">user-defined
- directives</a>. For user-defined directives you use
- <code class="inline-code">@</code> instead of <code class="inline-code">#</code>, for example
- <code class="inline-code"><@mydirective
- <em class="code-color">parameters</em>><em class="code-color">...</em></@mydirective></code>.
- Further difference is that if the directive has no nested content, you
- must use a tag like <code class="inline-code"><@mydirective
- <em class="code-color">parameters</em> /></code>, similarly as in
- XML (e.g. <code class="inline-code"><img <em class="code-color">...</em>
- /></code>). But user-defined directives is an advanced topic
- that will be discussed <a href="dgui_misc_userdefdir.html">later</a>.</p><p>FTL tags, like HTML tags, must be properly nested. So the code
- below is wrong, as the <code class="inline-code">if</code> directive is both inside
- and outside of the nested content of the <code class="inline-code">list</code>
- directive:</p>
-
-<div class="code-wrapper"><pre class="code-block code-template"><ul>
-<strong><#list animals as animal></strong>
- <li>${animal.name} for ${animal.price} Euros
- <strong><#if user == "Big Joe"></strong>
- (except for you)
-<strong></#list></strong> <#-- WRONG! The "if" has to be closed first. -->
-<strong></#if></strong>
-</ul></pre></div><p>Note that FreeMarker doesn't care about the nesting of HTML
- tags, only about the nesting of FTL tags. It just sees HTML as flat
- text, it doesn't interpret it in any way.</p><p>If you try to use a non-existing directive (e.g., you mistype
- the directive name), FreeMarker will decline to use the template and
- produce an error message.</p><p>FreeMarker ignores superfluous <a href="gloss.html#gloss.whiteSpace">white-space</a> inside FTL tags. So you
- can write this:</p>
-
-<div class="code-wrapper"><pre class="code-block code-template"><span class="marked-text"><span class="marked-ftl-tag"><#list<em><span class="marked-invisible-text">[BR]</span></em>
-��animals�������as<em><span class="marked-invisible-text">[BR]</span></em>
-�����animal<em><span class="marked-invisible-text">[BR]</span></em>
-></span><em><span class="marked-invisible-text">[BR]</span></em>
-<span class="marked-interpolation">${animal.name}</span>�for�<span class="marked-interpolation">${animal.price}</span>�Euros<em><span class="marked-invisible-text">[BR]</span></em>
-<span class="marked-ftl-tag"></#list����></span></span></pre></div><p>You may not, however, insert white-space between the
- <code class="inline-code"><</code> or <code class="inline-code"></</code> and the directive
- name.</p><p>The complete list and description of all directives can be found
- in the <a href="ref_directives.html">Template Language Reference/Directive Reference</a> (but I recommend that you look
- at the chapter about expressions first).</p> <div class="callout note">
- <strong class="callout-label">Note:</strong>
-
- <p>FreeMarker can be configured to use <code class="inline-code">[</code> and
- <code class="inline-code">]</code> instead of <code class="inline-code"><</code> and
- <code class="inline-code">></code> in the FTL tags and FTL comments, like
- <code class="inline-code">[#if user == "Big
- Joe"]<em class="code-color">...</em>[/#if]</code>. For more
- information read: <a href="dgui_misc_alternativesyntax.html">Miscellaneous/Alternative (square bracket) syntax</a>.</p>
- </div>
- <div class="callout note">
- <strong class="callout-label">Note:</strong>
-
- <p>FreeMarker can be configured so that it understands predefined
- directives without <code class="inline-code">#</code> (like <code class="inline-code"><if user
- == "Big
- Joe"><em class="code-color">...</em></if></code>).
- However we don't recommend the usage of this mode. For more
- information read: <a href="ref_depr_oldsyntax.html">Template Language Reference/Deprecated FTL constructs/Old FTL syntax</a></p>
- </div>
-<div class="bottom-pagers-wrapper"><div class="pagers bottom"><a class="paging-arrow previous" href="dgui_template_overallstructure.html"><span>Previous</span></a><a class="paging-arrow next" href="dgui_template_exp.html"><span>Next</span></a></div></div></div></div> </div>
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