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# HtmlTag | ||
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The `HtmlTag` helper is used to **create the root of an HTML document**, the | ||
open and close tags for the `<html>` element. | ||
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## Basic Usage | ||
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```php | ||
<?= $this->htmlTag(['lang' => 'en'])->openTag() ?> | ||
<!-- Some HTML --> | ||
<?= $this->htmlTag()->closeTag() ?> | ||
``` | ||
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Output: | ||
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```html | ||
<html lang="en"> | ||
<!-- Some HTML --> | ||
</html> | ||
``` | ||
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## Using Attributes | ||
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### Set a single Attribute | ||
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```php fct_label="Invoke Usage" | ||
$this->htmlTag(['lang' => 'en']); | ||
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echo $this->htmlTag()->openTag(); // <html lang="en"> | ||
``` | ||
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```php fct_label="Setter Usage" | ||
$this->htmlTag()->setAttribute('lang', 'en'); | ||
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echo $this->htmlTag()->openTag(); // <html lang="en"> | ||
``` | ||
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### Set multiple Attributes | ||
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```php fct_label="Invoke Usage" | ||
$this->htmlTag(['lang' => 'en', 'id' => 'example']); | ||
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echo $this->htmlTag()->openTag(); // <html lang="en" id="example"> | ||
``` | ||
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```php fct_label="Setter Usage" | ||
$this->htmlTag()->setAttributes(['lang' => 'en', 'id' => 'example']); | ||
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echo $this->htmlTag()->openTag(); // <html lang="en" id="example"> | ||
``` | ||
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### Get current Value | ||
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To get the current value, use the `getAttributes()` method. | ||
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```php | ||
$this->htmlTag(['lang' => 'en', 'id' => 'example']); | ||
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var_dump($this->htmlTag()->getAttributes()); // ['lang' => 'en', 'id' => 'example'] | ||
``` | ||
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### Default Value | ||
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The default value is an empty `array` that means no attributes are set. | ||
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## Using Namespace | ||
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The `HtmlTag` helper can automatically add the [XHTML namespace](http://www.w3.org/1999/xhtml/) | ||
for XHTML documents. To use this functionality, the [`Doctype` helper](doctype.md) | ||
is used. | ||
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The namespace is added only if the document type is set to an XHTML type and use | ||
is enabled: | ||
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```php | ||
// Set doctype to XHTML | ||
$this->doctype(Zend\View\Helper\Doctype::XHTML1_STRICT); | ||
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// Add namespace to open tag | ||
$this->htmlTag()->setUseNamespaces(true); | ||
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// Output | ||
echo $this->htmlTag()->openTag(); // <html xmlns="http://www.w3.org/1999/xhtml"> | ||
``` | ||
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### Get current Value | ||
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To get the current value, use the `getUseNamespaces()` method. | ||
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```php | ||
$this->htmlTag()->setUseNamespaces(true); | ||
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var_dump($this->htmlTag()->getUseNamespaces()); // true | ||
``` | ||
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### Default Value | ||
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The default value is `false` that means no namespace is added as attribute. |
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