如何在drupal中創建文件下載鏈接8

Question

我已經爲mp3文件創建了一個自定義字段格式化程序，並添加了一個名爲「Provide Download Link」的設置表單字段，該字段是一個複選框。如果選中「提供下載鏈接」，我想提供文件下載鏈接。任何人都可以告訴我如何在drupal 8中創建這個下載鏈接？我必須通過動態下載鏈接到格式化程序模板文件（小枝），以便用戶可以通過單擊鏈接下載mp3文件。

Answer 1

我假設你要添加的格式化的字段是允許文件e.g MP3文件

Mp3Formatter.php假設這是格式化的類名的上傳。確保您的格式化類從FileFormatterBase

use Drupal\file\Plugin\Field\FieldFormatter\FileFormatterBase; 

     // Get "Provide Download Link」 settings value. 
     // Assuming the machine name you gave to your setting is : download_link_setting. 
     // Add the code below to your formatter class under the method body: viewElements 
     // Get the referenced entities in this case files. 

     $files = $this->getEntitiesToView($items); 

     // initialise $url variable. 

     $url = NULL; 

     $download_link_setting = $this->getSetting(‘download_link_setting’); 

     // Loop through the file entities. 

     foreach ($files as $delta => $file) { 

      // For each file add code below. 
      // Check if the setting isn’t empty and then create the file url. 

      if (!empty($download_link_setting)) { 
      $mp3_uri = $file->getFileUri(); 
      $url = Url::fromUri(file_create_url($mp3_uri)); 
      } 

      // Add the $url parameter to your render array e.g 

      $elements[$delta] = [ 
      '#theme' => ‘mp3_formatter', 
      '#item' => $item, 
      '#url' => $url, 
      '#filename' => $item->getFilename(), 
      ]; 
     } 

     return $elements; 

延伸。在你的模塊的.module文件。

 // Register your theme under hook_theme. 

     'mp3_formatter' => [ 
      'variables' => [ 
      'item' => NULL, 
      'url' => NULL, 
      'filename' => NULL, 
      ], 
     ], 

在對應TWIG模板

 // Now add your download link into the twig element. 
     // check if the url variable is set 
     {% if url %} 
      <a href="{{ url }}" download>{{ filename }}</a> 
     {% else %} 
      <p> {{ filename }} </p> 
     {% endif %}