Drupal7通过form API 建立无刷新的图片上传功能的四个方法
发布:smiling 来源: PHP粉丝网 添加日期:2015-12-07 13:49:37 浏览: 评论:0
本文我们讲讲在Drupal 7通过form API 实现无刷新图片上传的几个方法,比较实用,喜欢drupal建站的朋友可以参考一下.
表单是网站常用的,不可缺少的,而通过表单建立图片上传也是刚需,基本每个网站都需要图片上传功能,现在比较流行的是直接无刷新上传图片,无刷新上传图片在drupal7 如何做呢?下面代码就是实现此功能。
方法1:用file原件配合ajax参数实现:
- function testmodule_forma($form, &$form_state){
- $form['im-container'] = array(
- '#prefix'=>'<div id="im-area">',
- '#suffix'=>'</div>',
- );
- $form['image_file'] = array(
- '#type' => 'file',
- );
- $form['upload'] = array(
- '#type' => 'submit',
- '#value' => 'upload',
- '#submit' => array('upload_image'),
- '#ajax'=> array(
- 'callback'=>'upload_image',
- 'wrapper'=> 'im-area',
- 'method'=> 'replace',
- 'effect'=> 'fade',
- ),
- );
- return $form;
- }
- function upload_image($form, $form_state){
- $file = file_save_upload('image_file', array('file_validate_extensions' => array('png gif jpg jpeg')), "public://",$replace = FILE_EXISTS_REPLACE);
- if ($file)
- {
- $file->status=FILE_STATUS_PERMANENT;
- file_save($file);
- $form['im-container']=array(
- '#title'=>t('Preview:'),
- '#prefix'=>'<div id="im-area">',
- '#markup'=>'<img src="sites/default/files/'.$file->filename.'" height="250" width="250" />',
- '#suffix'=>'</div>',
- ); //phpfensi.com
- }
- else {
- drupal_set_message('No file uploaded.');
- }
- return $form['im-container'];
- }
方法2:直接使用 manage_file 原件实现:
上面的方式是需要配一个上传按钮,然而在drupal 7 有一个更好的表单原件 manage_file,可以通过manage_file实现无刷新上传.
- $form['image_example_image_fid'] = array(
- '#title' => t('<a href="/project/image" class="alinks-link" title="模块介绍:让有特定权限的用户可以上传图片到网站里,并且会自动产生缩图。图片可以使用在文章里(例如透过tinymce编辑工具进行选取),或是作成简单的网络相簿。">Image</a>'),
- '#type' => 'managed_file',
- '#description' => t('The uploaded image will be displayed on this page using the image style choosen below.'),
- '#default_value' => variable_get('image_example_image_fid', ''),
- '#upload_location' => 'public://image_example_images/',
- );
方法3:使用manage_file 原件 配合js 实现不需要点击上传按钮直接上传:
上面两种方式都可以实现无刷新上传,但界面并不友好,两种方式都是需要点击上传按钮才触发上传,我们更多时候是不想有上传按钮,下面这个方式就可以做到:
- File: auto_upload.info
- name = Auto Upload
- description = Removes the need for users to press the 'Upload' button for AJAX file uploads.
- core = 7.x
- dependencies[] = file
- File: auto_upload.js:
- (function ($) {
- Drupal.behaviors.autoUpload = {
- attach: function (<a href="/project/context" class="alinks-link" title="模块介绍:就是“根据某些条件”显示“某些区块”">context</a>, settings) {
- $('form', context).delegate('input.form-file', 'change', function() {
- $(this).next('input[type="submit"]').mousedown();
- });
- }
- };
- })(jQuery);
- File: auto_upload.module
- function auto_upload_init() {
- drupal_add_js(drupal_get_path('module', 'auto_upload') . '/auto_upload.js');
- }
我们还可以再优化下,让上传图片时候,显示缩略图:
- <?php
- /**
- * Implements hook_field_widget_form().
- */
- function multifield_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
- //Get the default format for user
- $default_format = array_shift(filter_formats($GLOBALS['user']))->format;
- $field_name = $instance['field_name'];
- $item =& $items[$delta];
- switch($instance['widget']['type']) {
- case 'multifield_base_widget':
- $element['img1_upload'] = array(
- '#title' => t('Image'),
- '#type' => 'managed_file',
- '#upload_location' => 'public://multifield_images/',
- '#default_value' => isset($item['img1_upload']) ? $item['img1_upload'] : 0,
- // assign #theme directly to the managed_file in other case it won't be
- // rebuilt after file upload
- '#theme' => 'image_multifield_multitype',
- );
- }
- return $element;
- }
- /**
- * Implements hook_theme().
- */
- function multifield_theme() {
- return array(
- 'image_multifield_multitype' => array(
- 'render element' => 'element',
- ),
- );
- }
- /**
- * Returns HTML for a managed file element with thumbnail.
- */
- function theme_image_multifield_multitype($variables) {
- $element = $variables['element'];
- $output = '';
- if($element['fid']['#value'] != 0) {
- // if image is uploaded show its thumbnail to the output HTML
- $output .= '<div class="multifield-thumbnail">';
- //$output .= theme('image_style', array('style_name' => 'thumbnail', 'path' => file_load($element['fid']['#value'])->uri, 'getsize' => FALSE));
- $output .= '<img src="' . image_style_url('medium', file_load($element['fid']['#value'])->uri). '" class="thumbnail"/>';
- $output .= drupal_render_children($element); // renders rest of the element as usual
- $output .= '</div>';
- }
- return $output; // of course, has to be returned back
- }
- ?>
方法4:用第三方模块
还有一种方式比较简单直接,就是直接用第三方模块,例如Drag & Drop Upload 模块,就能实现无刷新上传,并且还支持拖拽,挺好的.
Tags: Drupal7 API无刷新 Drupal7上传
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