如何在表单 API 中传递动态文件位置？答案

【问题标题】：How to pass dynamic file location in Form API?如何在表单 API 中传递动态文件位置？
【发布时间】：2016-07-28 05:25:51
【问题描述】：

我的要求是将文件上传到特定文件夹。我怎样才能通过使用表单 api 来实现这一点。如何修改下面的代码以使 upload_location 应该是动态的。上传的文件应保存到用户提供的文件夹名称中。
#submit 元素没有调用 custom_document_submit 函数。

 $form['folder_name'] = array(
      '#type' => 'textfield',
      '#title' => t('Folder Name'),
  );
  $form['document'] = array(
    '#type' => 'managed_file',
    '#upload_validators' => array('file_validate_extensions' => array('xml')),
    '#upload_location' => 'public://',
    '#submit' => array('custom_document_submit'),
    );
function custom_document_submit($form, &$form_state){
  $destination = $form_state['values']['folder_name'];
  $validators = array();
  $file = file_save_upload('document', $validators, 'public://'.$destination);
}

【问题讨论】：

标签： drupal-7 drupal-modules drupal-forms

【解决方案1】：

#submit property 不能在 managed_file 表单对象上声明...

相反，您必须在表单（或按钮）上添加或修改提交操作。

$form['#submit'][] = 'custom_document_submit';

如果您不想修改表单的提交方法，您也可以简单地添加一个验证器（使用#validate property），女巫将根据文件夹名称值修改文档的“#upload_location”属性.

#submit 和 #validate 属性都必须添加到表单本身。

【讨论】：

【解决方案2】：

<?php

define('IMPORT_DIRECTORY_PATH', 'public://import');

$form['folder_name'] = array(
      '#type' => 'textfield',
      '#title' => t('Folder Name'),
  );


  form['document'] = array(
    '#title' => t('Upload .xml'),
    '#type' => 'managed_file',
    '#upload_validators' => array(
      'file_validate_extensions' => array('xml'),
    ),
    '#process' => array('import_document_element_process'),
  );

$form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#submit' => array('custom_document_submit'),
  );

function custom_document_submit($form, &$form_state){

  // Validate extensions.
    $validators = array(
      'file_validate_extensions' => array('xml'),
    );
    $file = file_save_upload('document', $validators, FALSE, FILE_EXISTS_RENAME);

    // If the file passed validation.
    if ($file) {
      // Rename uploaded file to prevent cache from remembering name file.
      $directory = SCHEDULES_IMPORT_DIRECTORY_PATH;
      if (file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
        $uri = $directory . '/xml_' . $file->uid . '_' . $file->timestamp . '.xml';
        if ($file = file_move($file, $uri)) {
          $form_state['values']['document'] = $file;
        }
        else {
          form_set_error('document', t('The file could not be uploaded.'));
        }
      }
      else {
        form_set_error('document', t('The directory is not writable.'));
      }
    }
    else {
      form_set_error('document', t('The file extension is not correct.'));
    }
    // dpm($form_state['values']['document']);
    // var_dump( $form_state['values']['document']);
}


/**
 * Removing the upload button in managed files.
 */
function import_document_element_process($element, &$form_state, $form) {
  $element = file_managed_file_process($element, $form_state, $form);
  $element['upload_button']['#access'] = FALSE;

  return $element;
}

【讨论】：