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| <h1 class="content-header header-section1" id="ref_directive_if" itemprop="headline">if, else, elseif</h1> |
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| <div class="page-menu-title">Page Contents</div> |
| <ul><li><a class="page-menu-link" href="#autoid_78" data-menu-target="autoid_78">Synopsis</a></li><li><a class="page-menu-link" href="#autoid_79" data-menu-target="autoid_79">Description</a></li></ul> </div><a name="ref.directive.if"></a><a name="ref.directive.else"></a><a name="ref.directive.elseif"></a> |
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| |
| |
| |
| <h2 class="content-header header-section2" id="autoid_78">Synopsis</h2> |
| |
| |
| |
| <pre class="metaTemplate"> |
| <code class="inline-code"><#if <em class="code-color">condition</em>> |
| <em class="code-color">...</em> |
| <#elseif <em class="code-color">condition2</em>> |
| <em class="code-color">...</em> |
| <#elseif <em class="code-color">condition3</em>> |
| <em class="code-color">...</em> |
| <em class="code-color">...</em> |
| <#else> |
| <em class="code-color">...</em> |
| </#if></code> |
| </pre> |
| |
| |
| <p>Where:</p> |
| |
| <ul> |
| <li> |
| <code class="inline-code"><em class="code-color">condition</em></code>, |
| <code class="inline-code"><em class="code-color">condition2</em></code>, |
| ...etc.: Expression evaluates to a boolean value. |
| </li> |
| </ul> |
| |
| |
| |
| |
| |
| <h2 class="content-header header-section2" id="autoid_79">Description</h2> |
| |
| |
| <p>You can use <code class="inline-code">if</code>, <code class="inline-code">elseif</code> |
| and <code class="inline-code">else</code> directives to conditionally skip a |
| section of the template. The |
| <code class="inline-code"><em class="code-color">condition</em></code>-s must |
| evaluate to a boolean value, or else an error will abort template |
| processing. The <code class="inline-code">elseif</code>-s and |
| <code class="inline-code">else</code>-s must occur inside <code class="inline-code">if</code> |
| (that is, between the <code class="inline-code">if</code> start-tag and end-tag). |
| The <code class="inline-code">if</code> can contain any number of |
| <code class="inline-code">elseif</code>-s (including 0) and at the end optionally |
| one <code class="inline-code">else</code>. Examples:</p> |
| |
| <p><code class="inline-code">if</code> with 0 <code class="inline-code">elseif</code> and no |
| <code class="inline-code">else</code>:</p> |
| |
| |
| |
| <div class="code-wrapper"><pre class="code-block code-template"><#if x == 1> |
| x is 1 |
| </#if></pre></div> |
| |
| <p><code class="inline-code">if</code> with 0 <code class="inline-code">elseif</code> and |
| <code class="inline-code">else</code>:</p> |
| |
| |
| |
| <div class="code-wrapper"><pre class="code-block code-template"><#if x == 1> |
| x is 1 |
| <#else> |
| x is not 1 |
| </#if></pre></div> |
| |
| <p><code class="inline-code">if</code> with 2 <code class="inline-code">elseif</code> and no |
| <code class="inline-code">else</code>:</p> |
| |
| |
| |
| <div class="code-wrapper"><pre class="code-block code-template"><#if x == 1> |
| x is 1 |
| <#elseif x == 2> |
| x is 2 |
| <#elseif x == 3> |
| x is 3 |
| </#if></pre></div> |
| |
| <p><code class="inline-code">if</code> with 3 <code class="inline-code">elseif</code> and |
| <code class="inline-code">else</code>:</p> |
| |
| |
| |
| <div class="code-wrapper"><pre class="code-block code-template"><#if x == 1> |
| x is 1 |
| <#elseif x == 2> |
| x is 2 |
| <#elseif x == 3> |
| x is 3 |
| <#elseif x == 4> |
| x is 4 |
| <#else> |
| x is not 1 nor 2 nor 3 nor 4 |
| </#if></pre></div> |
| |
| <p>To see more about boolean expressions, see: <a href="dgui_template_exp.html">Template Author's Guide/The Template/Expressions</a>.</p> |
| |
| <p>You can nest <code class="inline-code">if</code> directives (of |
| course):</p> |
| |
| |
| |
| <div class="code-wrapper"><pre class="code-block code-template"><#if x == 1> |
| x is 1 |
| <#if y == 1> |
| and y is 1 too |
| <#else> |
| but y is not |
| </#if> |
| <#else> |
| x is not 1 |
| <#if y < 0> |
| and y is less than 0 |
| </#if> |
| </#if></pre></div> |
| |
| <div class="callout note"> |
| <strong class="callout-label">Note:</strong> |
| |
| <p>How to test if x is greater than 1? <code class="inline-code"><#if x > |
| 1></code> will be <em>wrong</em>, as FreeMarker |
| will interpret the first <code class="inline-code">></code> as the end of the |
| tag. Thus, either write <code class="inline-code"><#if (x > 1)></code> |
| or <code class="inline-code"><#if x &gt; 1></code>.</p> |
| </div> |
| |
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| <time itemprop="dateModified" datetime="2020-07-09T23:48:37Z" title="Thursday, July 9, 2020 11:48:37 PM GMT">2020-07-09 23:48:37 GMT</time> </p> |
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