在 Drupal 7 中使用表单

Question

我有保存图片的节点。有一项任务是提供在每个节点中选择图片的类型和大小以进一步下载到最终用户设备的能力。 为此，我想在每个节点下附加一个表单，以允许用户选择他们需要的类型和大小。用户选择它并放置提交按钮后，我想处理用户的请求，在服务器端生成他们需要的图片，并以某种方式让他的浏览器下载它。但我不知道如何实现这一点，因为我不了解 Drupal 7 中的客户端-服务器交换机制。我知道基本的 Form API，但它对我没有帮助。 那么，你有什么建议？

编辑 1

这是我的模块testmodule.module的源代码

<?php
function testmodule_custom_form($form, &$form_state) {
    $form=array();
    $form['image_types'] = array(
        '#type' => 'radios',
        '#title' => t('Select image type to download'),
        '#options' => array(0 => t('SVG'), 1 => t('PNG'), 2 => t('ICON')),
    );
    $form['image_sizes'] = array(
        '#type' => 'radios',
        '#title' => t('Select image size'),
        '#options' => array(0 => t('100x100'), 1 => t('200x200')),
    );
    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Download'),

    );
    return $form;
}

function testmodule_custom_form_submit($form, &$form_state) {
    drupal_set_message('IT WORKS!!!');
}

function testmodule_node_view($node, $view_mode, $langcode) {
    if($node->type === 'article') {
        $my_form = drupal_get_form('testmodule_custom_form', $node);
        $node->content['attached_form'] = array(
            '#markup' => drupal_render($my_form),
            '#weight' => 99,
        );
    }
}

function testmodule_node_presave($node) {
    $node->body[$node->language][0]['format']  = 'full_html';
    if ($node->field_image_svg[$node->language])
    {
        $file = file_load($node->field_image_svg[$node->language][0]['fid']);
        $image = new Imagick(drupal_realpath($file->uri));
        $image->setImageFormat("png");
        $destination = 'public://pngimages/'.$file->filename.'.png';
        $image->writeImage(drupal_realpath($destination)); 
        $data = file_get_contents(drupal_realpath($destination));
        $file = file_save_data($data, $destination, FILE_EXISTS_REPLACE);
        $node->field_image[$node->language][0] = (array)$file;  
    }
}
?>  

Answer 1

我通常更喜欢的另一种方法是使用带有默认值的程序块。

我已经在你的代码中实现了一个并清理了一些项目以更好地符合编码标准。

/**
 * Implements hook_form().
 */
function testmodule_custom_form($form, &$form_state) {
  $form = array();
  $form['image_types'] = array(
    '#type' => 'radios',
    '#title' => t('Select image type to download'),
    '#options' => array(0 => t('SVG'), 1 => t('PNG'), 2 => t('ICON')),
  );
  $form['image_sizes'] = array(
    '#type' => 'radios',
    '#title' => t('Select image size'),
    '#options' => array(0 => t('100x100'), 1 => t('200x200')),
  );
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Download'),

  );
  return $form;
}

/**
 * Implements hook_form_submit().
 */
function testmodule_custom_form_submit($form, &$form_state) {
  drupal_set_message('IT WORKS!!!');
}

/**
 * Implements hook_block_info().
 */
function testmodule_block_info() {
  $blocks = array();

  $blocks['image_download'] = array(
    'info' => t('Node - Image download'),
    'status' => 1,
    'region' => 'content',
    'visibility' => BLOCK_VISIBILITY_LISTED,
    'pages' => 'node/*',
    'cache' => DRUPAL_CACHE_PER_PAGE,
    'weight' => 1,
  );

  return $blocks;
}

/**
 * Implements hook_block_view().
 */
function testmodule_block_view($delta = '') {
  $n = menu_get_object();
  if (!$n || $n->type != 'only_particular_content_type') {
    return FALSE;
  }

  if ($delta == 'image_download') {
    return array(
      'content' => drupal_get_form('testmodule_custom_form'),
    );
  }

  return FALSE;
}

/**
 * Implements hook_node_presave().
 */
function testmodule_node_presave($node) {
  $node->body[$node->language][0]['format']  = 'full_html';
  $field_image_svg = field_get_items('node', $node, 'field_image_svg');
  if (!$field_image_svg) {
    return;
  }

  $file = file_load($field_image_svg[0]['fid']);
  $image = new Imagick(drupal_realpath($file->uri));
  $image->setImageFormat("png");
  $destination = 'public://pngimages/'.$file->filename.'.png';
  $image->writeImage(drupal_realpath($destination));
  $data = file_get_contents(drupal_realpath($destination));
  $file = file_save_data($data, $destination, FILE_EXISTS_REPLACE);
  $node->field_image[$node->language][0] = (array)$file;

}

Answer 2

一种方法是创建一个带有表单回调函数的自定义模块。

代码示例：

function YOUR_MODULE_custom_form($form, &$form_state) {
    // your form controls and inputs go here
}

function YOUR_MODULE_custom_form_submit($form, &$form_state) {
    // your form submission handler.
    // your image resizing logic and any other logic should go here
}

然后为了将此表单附加到节点，创建一个hook_node_view 实现。

function YOUR_MODULE_node_view($node, $view_mode, $langcode)
{
    if($node->type === 'YOUR_CONTENT_TYPE') {
        $my_form = drupal_get_form('YOUR_MODULE_custom_form', $node);
        $node->content['your_attached_form'] = array(
            '#markup' => drupal_render($my_form),
            '#weight' => 99,
        );
    }
}

希望这能让你开始。我强烈建议您花时间熟悉 Drupal 表单 API 并创建自定义模块，这将使您的生活更轻松:)。