If

if, else if, else

Description

{{ if condition }}
{{ else if condition }}
{{ else }}
{{ end }}

Outputs a part of the template only when a condition is true. The condition is a PHP expression: comparison and logical operators (===, >, &&, ||, ! …) and PHP functions (is_array, count …) work, with template variables written as usual ($page.foo).

• {{ if $var }} with a single variable checks isset($var) && $var: it is false when the variable is not set.
• In any other expression, a variable that is not set reads as null without a warning, so {{ if $page.count > 0 }} is safe when count is missing.
• {{ elseif }} (without a space) is accepted as well as {{ else if }}.
• {{ end }} closes the block. {{ else }} or {{ else if }} outside an if, a missing {{ end }} or an extra one is an error reported with its line (see Lint and errors).

Example

Template

{{ if $page.foo === 'bar' }}
    foo is bar
{{ else if $page.foo === 'baz' }}
    foo is baz
{{ else }}
    foo is neither bar nor baz
{{ end }}

Checking whether a value is set

Template

{{ if $page.image_id }}
<img src="{{ $page.image_id|getImageUrl }}" alt="">
{{ end }}

{{ if !isset($page.data) || count($page.data) === 0 }}
<p>No news yet.</p>
{{ end }}

Using a function

Template

{{ if isNew($post.post_date) }}<span class="c-label">NEW</span>{{ end }}

isNew() is defined by the skeleton in htdocs/_fegg/site/functions/modifier.php. Functions defined there can be called in any expression.