在 Drupal 7 中使用表单 [英] Working with forms in Drupal 7

问题描述

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?

I have nodes keeping a picture. There is a task to provide an ability to select a type and a size of the picture in every node for further downloading to the end user device. To do this, I want to attach a form under every node to allow user select a type and a size they need. After user select it and put submit-button I want to process user's request, to generate the picture they need on the server side and make somehow his browser to download it. But I have no idea how to achieve this because I don't understand a mechanism of client-server exchange in Drupal 7. I know basic Form API, but it does not help me. So, what can you advice?

编辑 1

这是我的模块的源代码testmodule.module

This is a source code of my module testmodule.module

<?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;  
    }
}
?>  

推荐答案

一种方法是创建一个带有表单回调函数的自定义模块.

One way to do this is to create a custom module with a form callback function.

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.

Then in order to attach this form to nodes, create a hook_node_view implementation.

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.我强烈建议您花点时间熟悉 Drupal 表单 API 并创建自定义模块，这将使您的生活更轻松:).

Hope this gets you started. I highly recommend taking your time getting familiar with Drupal form API and creating custom modules, that would make your life a lot easier :).

这篇关于在 Drupal 7 中使用表单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！