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50 lines
1.6 KiB
Markdown
50 lines
1.6 KiB
Markdown
# Attributes
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Most of the [tags](./language-syntax-tags.md) take attributes that
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specify or modify their behavior. Attributes to Smarty functions are
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much like HTML attributes. Static values don't have to be enclosed in
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quotes, but it is required for literal strings. Variables with or
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without modifiers may also be used, and should not be in quotes. You can
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even use PHP function results, plugin results and complex expressions.
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Some attributes require boolean values (TRUE or FALSE). These can be
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specified as `true` and `false`. If an attribute has no value assigned
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it gets the default boolean value of true.
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## Examples
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```smarty
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{include file="header.tpl"}
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{include file="header.tpl" nocache} // is equivalent to nocache=true
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{include file="header.tpl" attrib_name="attrib value"}
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{include file=$includeFile}
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{include file=#includeFile# title="My Title"}
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{assign var=foo value={counter}} // plugin result
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{assign var=foo value=substr($bar,2,5)} // PHP function result
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{assign var=foo value=$bar|strlen} // using modifier
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{assign var=foo value=$buh+$bar|strlen} // more complex expression
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{html_select_date display_days=true}
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{mailto address="smarty@example.com"}
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<select name="company_id">
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{html_options options=$companies selected=$company_id}
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</select>
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```
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> **Note**
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>
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> Although Smarty can handle some very complex expressions and syntax,
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> it is a good rule of thumb to keep the template syntax minimal and
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> focused on presentation. If you find your template syntax getting too
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> complex, it may be a good idea to move the bits that do not deal
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> explicitly with presentation to PHP by way of plugins or modifiers.
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