如何处理Zend Framework 2应用程序中的元描述/关键字？

Question

在布局文件中定义的默认页面title可以扩展（PREPEND/APPEND）或替换（SET），使用特定于当前视图的标题。

这种行为我也期待HeadMeta视图助手。现在我找不到任何适当的方式来“扩展”我在布局文件中定义的默认值descrition/keywords。

代替它，我可以append(...)/appendName(...)（与之相似，以添加样式或脚本文件，HeadLink或HeadScript）添加进一步meta标签。但它对descrition和keywordsmeta标签没有任何意义。

是否有推荐的方法来处理这个问题？如何处理description/keywordsmeta标签？

Answer 1

这里是一个快速&脏workaroud，我目前使用（用于清洁的解决方案，而不是一个丑陋的解决方法的框架，需要改变）：

HeadMeta视图助手

<?php 
namespace MyNamespace\View\Helper; 

use stdClass; 
use Zend\View; 
use Zend\View\Exception; 
use Zend\View\Helper\HeadMeta as ZendHeadMeta; 
use Zend\View\Helper\Placeholder\Container\AbstractContainer; 

class HeadMeta extends ZendHeadMeta { 

    const DELIMITER = ' - '; 

    /** 
    * @see \Zend\View\Helper\HeadMeta::__invoke() 
    */ 
    public function __invoke($content = null, $keyValue = null, $keyType = 'name', $modifiers = array(), $placement = AbstractContainer::APPEND) { 
     parent::__invoke($content, $keyValue, $keyType, $modifiers, $placement); 
     return $this; 
    } 

    /** 
    * @see \Zend\View\Helper\HeadMeta::append() 
    */ 
    public function append($value) { 
     if ($value->name == 'description') { 
      $this->updateDescription($value, AbstractContainer::APPEND); 
     } else if ($value->name == 'keywords') { 
      $this->updateKeywords($value, AbstractContainer::APPEND); 
     } else { 
      parent::append($value); 
     } 
    } 

    /** 
    * @see \Zend\View\Helper\HeadMeta::prepend() 
    */ 
    public function prepend($value) { 
     if ($value->name == 'description') { 
      $this->updateDescription($value, AbstractContainer::PREPEND); 
     } else if ($value->name == 'keywords') { 
      $this->updateKeywords($value, AbstractContainer::PREPEND); 
     } else { 
      parent::prepend($value); 
     } 
    } 

    // Not working correctly! 
    // Can cause a 
    // Fatal error: Maximum function nesting level of '100' reached, aborting! 
    /** 
    * @see \Zend\View\Helper\HeadMeta::set() 
    */ 
    public function set($value) { 
     if ($value->name == 'description') { 
      $this->updateDescription($value, AbstractContainer::SET); 
     } else if ($value->name == 'keywords') { 
      $this->updateKeywords($value, AbstractContainer::SET); 
     } else { 
      parent::set($value); 
     } 
    } 

    /** 
    * If a description meta already exsists, extends it with $value->content, 
    * else creates a new desctiprion meta. 
    * @param \stdClass $value 
    * @param string $position 
    */ 
    public function updateDescription(\stdClass $value, $position = AbstractContainer::SET) { 
     $descriptionExists = false; 
     foreach ($this->getContainer() as $item) { 
      if ($this->isDescription($item)) { 
       switch ($position) { 
        case AbstractContainer::APPEND: 
         $descriptionString = implode(static::DELIMITER, array($item->content, $value->content)); 
         break; 
        case AbstractContainer::PREPEND: 
         $descriptionString = implode(static::DELIMITER, array($value->content, $item->content)); 
         break; 
        case AbstractContainer::SET: 
        default: 
         $descriptionString = $value->content; 
         break; 
       } 
       $item->content = $descriptionString; 
       $descriptionExists = true; 
      } 
     } 
     if (!$descriptionExists) { 
      switch ($position) { 
       case AbstractContainer::APPEND: 
        parent::append($value); 
        break; 
       case AbstractContainer::PREPEND: 
        parent::prepend($value); 
        break; 
       case AbstractContainer::SET: 
       default: 
        parent::set($value); 
        break; 
      } 
     } 
    } 

    /** 
    * If a keywords meta already exsists, extends it with $value->content, 
    * else creates a new keywords meta. 
    * @param \stdClass $value 
    * @param string $position 
    */ 
    public function updateKeywords(\stdClass $value, $position = AbstractContainer::SET) { 
     $keywordsExists = false; 
     foreach ($this->getContainer() as $item) { 
      if ($this->isKeywords($item)) { 
       switch ($position) { 
         case AbstractContainer::APPEND: 
          $keywordsString = implode(', ', array($item->content, $value->content)); 
          break; 
         case AbstractContainer::PREPEND: 
          $keywordsString = implode(', ', array($value->content, $item->content)); 
          break; 
         case AbstractContainer::SET: 
         default: 
          $keywordsString = $value->content; 
          break; 
       } 
       $item->content = $keywordsString; 
       $keywordsExists = true; 
      } 
     } 
     if (!$keywordsExists) { 
      parent::append($value); 
     } 
    } 

    /** 
    * @return description meta text 
    */ 
    public function getDescription() { 
     $description = null; 
     foreach ($this->getContainer() as $item) { 
      if ($this->isKeywords($item)) { 
       $description = $item->content; 
       break; 
      } 
     } 
     return $description; 
    } 

    /** 
    * @return keywords meta text 
    */ 
    public function getKeywords() { 
     $keywords = null; 
     foreach ($this->getContainer() as $item) { 
      if ($this->isKeywords($item)) { 
       $keywords = $item->content; 
       break; 
      } 
     } 
     return $keywords; 
    } 

    /** 
    * Checks, whether the input $item is an approproate object for $this->container 
    * and wheter it's a description object (its name is "description") 
    * @param stdClass $item 
    * @throws Exception\InvalidArgumentException 
    * @return boolean 
    */ 
    public function isDescription(stdClass $item) { 
     if (!in_array($item->type, $this->typeKeys)) { 
      throw new Exception\InvalidArgumentException(sprintf(
       'Invalid type "%s" provided for meta', 
       $item->type 
      )); 
     } 
     return $item->name == 'description'; 
    } 

    /** 
    * Checks, whether the input $item is an approproate object for $this->container 
    * and wheter it's a keywords object (its name is "keywords") 
    * @param stdClass $item 
    * @throws Exception\InvalidArgumentException 
    * @return boolean 
    */ 
    public function isKeywords(stdClass $item) { 
     if (!in_array($item->type, $this->typeKeys)) { 
      throw new Exception\InvalidArgumentException(sprintf(
       'Invalid type "%s" provided for meta', 
       $item->type 
      )); 
     } 
     return $item->name == 'keywords'; 
    } 

} 

/module/Application/view/layout/layout.phtml

<?php 
$this->headMeta()->appendName(
    'description', 
    $this->translate('default description') 
); 
$this->headMeta()->appendName(
    'keywords', 
    implode(', ', array(
     $this->translate('default keyword 1'), 
     $this->translate('default keyword 2'), 
     $this->translate('default keyword 3'), 
    )) 
); 
echo $this->headMeta(); 
?> 

视图脚本

<?php 
$this->headMeta()->setName('keywords', implode(
    ', ', 
    array(
     $this->translate('view specific keyword 1'), 
     $this->translate('view specific keyword 2'), 
     $this->translate('view specific keyword 3'), 
    ) 
)); 
$this->headMeta()->setName('description', 'view specific description'); 
?> 

Answer 2

链接到这里我的答案：How to change meta tags in zend framework layout

下面是我工作。在布局文件中，您必须确保元标记被回显。它在阶段是空的，但你会标记元标记将被输出的位置。这种方法唯一的缺点是，似乎没有一种方法来获得默认的元标记，因此您必须在每个视图文件中添加元标记。

在布局文件

<?php echo $this->headMeta(); ?> 

在视图一个.phtml文件

$this->headMeta("test description text", "description");