jQuery File Upload 单页面多实例的实现

jQuery File Upload 的 GitHub 地址：https://github.com/blueimp/jQuery-File-Upload

插件描述：jQuery File Upload 是一个 jQuery 图片上传组件，支持多文件上传、取消、删除，上传前缩略图预览、列表显示图片大小，支持上传进度条显示。插件基于开放的标准，如 HTML5 和 JavaScript ，不需要额外的浏览器插件（例如使用Adobe 的 Flash ），在旧版浏览器中使用XMLHttpRequest 上传文件。（参见：http://www.jq22.com/jquery-info230）。

需求：在一个页面中包含多个插件实例。例如在生鲜电商网站后台的食谱添加/编辑页面，需要上传/编辑一道菜的食材和配料，就需要在页面中同时包含两个上传实例。插件的文档中有关于单页面多实例的介绍：Multiple File Upload Widgets on the same page，里面说明很简单，把 demo 中 index.html 的 form 表单的 id 改成 class，再简单修改 js/main.js 就可以了。

在很天真的试过之后，发现根本不是这么回事，index.html 中文件域的 name 是写死的，根本无法满足单页面多实例的需求，只能对插件进行修改...而且在改完之后发现修改的工作量很大。

代码是在 demo 的基础上，后端使用 php，删除了不需要的文件，比如其他后端语言处理程序。没有做数据验证和入库等处理，展示页面直接遍历文件夹读取文件。

最终效果图：

初始界面

上传图片及刷新页面

文件结构及主要修改文件

server

/index.html

<!DOCTYPE HTML>
<!--
/*
 * jQuery File Upload Plugin Demo 9.1.0
 * https://github.com/blueimp/jQuery-File-Upload
 *
 * Copyright 2010, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */
-->
<html lang="en">
<head>
<!-- Force latest IE rendering engine or ChromeFrame if installed -->
<!--[if IE]>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<![endif]-->
<meta charset="utf-8">
<title>jQuery File Upload Demo</title>
<meta name="description" content="File Upload widget with multiple file selection, drag&drop support, progress bars, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing. Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads.">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap styles -->
<link rel="stylesheet" href="css/bootstrap.min.css">
<!-- Generic page styles -->
<link rel="stylesheet" href="css/style.css">
<!-- blueimp Gallery styles -->
<link rel="stylesheet" href="css/blueimp-gallery.min.css">
<!-- CSS to style the file input field as button and adjust the Bootstrap progress bars -->
<link rel="stylesheet" href="css/jquery.fileupload.css">
<!-- <link rel="stylesheet" href="css/jquery.fileupload-ui.css"> -->
<!-- CSS adjustments for browsers with JavaScript disabled -->
<noscript><link rel="stylesheet" href="css/jquery.fileupload-noscript.css"></noscript>
<noscript><link rel="stylesheet" href="css/jquery.fileupload-ui-noscript.css"></noscript>
</head>
<body>
<div class="container">
    <!-- The file upload form used as target for the file upload widget -->
    <form class="fileupload" action="server/php" method="POST" enctype="multipart/form-data">
        <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
        <div class="row fileupload-buttonbar">
            <div class="col-lg-7">
                <!-- The fileinput-button span is used to style the file input field as button -->
                <span class="btn btn-primary">食材</span>
                <span class="btn btn-success fileinput-button">
                    <i class="glyphicon glyphicon-plus"></i>
                    <span>Add files...</span>
                    <input type="file" name="food[]" multiple>
                </span>
                <button type="submit" class="btn btn-primary start">
                    <i class="glyphicon glyphicon-upload"></i>
                    <span>Start upload</span>
                </button>
                <button type="reset" class="btn btn-warning cancel">
                    <i class="glyphicon glyphicon-ban-circle"></i>
                    <span>Cancel upload</span>
                </button>
                <button type="button" class="btn btn-danger delete">
                    <i class="glyphicon glyphicon-trash"></i>
                    <span>Delete</span>
                </button>
                <input type="checkbox" class="toggle">
                <!-- The global file processing state -->
                <span class="fileupload-process"></span>
            </div>
            <!-- The global progress state -->
            <div class="col-lg-5 fileupload-progress fade">
                <!-- The global progress bar -->
                <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
                    <div class="progress-bar progress-bar-success" style="width:0%;"></div>
                </div>
                <!-- The extended global progress state -->
                <div class="progress-extended"></div>
            </div>
        </div>
        <!-- The table listing the files available for upload/download -->
        <table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>     
    </form> 
    <!-- Multiple File Upload Widgets on the same page -->
    <form class="fileupload" action="server/php" method="POST" enctype="multipart/form-data">
        <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
        <div class="row fileupload-buttonbar">
            <div class="col-lg-7">
                <!-- The fileinput-button span is used to style the file input field as button -->
                <span class="btn btn-primary">配料</span>
                <span class="btn btn-success fileinput-button">
                    <i class="glyphicon glyphicon-plus"></i>
                    <span>Add files...</span>
                    <input type="file" name="batching[]" multiple>
                </span>
                <button type="submit" class="btn btn-primary start">
                    <i class="glyphicon glyphicon-upload"></i>
                    <span>Start upload</span>
                </button>
                <button type="reset" class="btn btn-warning cancel">
                    <i class="glyphicon glyphicon-ban-circle"></i>
                    <span>Cancel upload</span>
                </button>
                <button type="button" class="btn btn-danger delete">
                    <i class="glyphicon glyphicon-trash"></i>
                    <span>Delete</span>
                </button>
                <input type="checkbox" class="toggle">
                <!-- The global file processing state -->
                <span class="fileupload-process"></span>
            </div>
            <!-- The global progress state -->
            <div class="col-lg-5 fileupload-progress fade">
                <!-- The global progress bar -->
                <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
                    <div class="progress-bar progress-bar-success" style="width:0%;"></div>
                </div>
                <!-- The extended global progress state -->
                <div class="progress-extended"></div>
            </div>
        </div>
        <!-- The table listing the files available for upload/download -->
        <table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>     
    </form> 
</div>
<!-- The blueimp Gallery widget -->
<div id="blueimp-gallery" class="blueimp-gallery blueimp-gallery-controls" data-filter=":even">
    <div class="slides"></div>
    <h3 class="title"></h3>
    <a class="prev">‹</a>
    <a class="next">›</a>
    <a class="close">×</a>
    <a class="play-pause"></a>
    <ol class="indicator"></ol>
</div>
<!-- The template to display files available for upload -->
<script id="template-upload" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-upload fade">
        <td>
            <span class="preview"></span>
        </td>
        <td>
            <p class="name">{%=file.name%}</p>
            <strong class="error text-danger"></strong>
        </td>
        <td>
            <p class="size">Processing...</p>
            <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="progress-bar progress-bar-success" style="width:0%;"></div></div>
        </td>
        <td>
            {% if (!i && !o.options.autoUpload) { %}
                <button class="btn btn-primary start" disabled>
                    <i class="glyphicon glyphicon-upload"></i>
                    <span>Start</span>
                </button>
            {% } %}
            {% if (!i) { %}
                <button class="btn btn-warning cancel">
                    <i class="glyphicon glyphicon-ban-circle"></i>
                    <span>Cancel</span>
                </button>
            {% } %}
        </td>
    </tr>
{% } %}
</script>
<!-- The template to display files available for download -->
<script id="template-download" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-download fade">
        <td>
            <span class="preview">
                {% if (file.thumbnailUrl) { %}
                    <a href="{%=file.url%}" title="{%=file.name%}" download="{%=file.name%}" data-gallery><img src="{%=file.thumbnailUrl%}"></a>
                {% } %}
            </span>
        </td>
        <td>
            <p class="name">
                {% if (file.url) { %}
                    <a href="{%=file.url%}" title="{%=file.name%}" download="{%=file.name%}" {%=file.thumbnailUrl?'data-gallery':''%}>{%=file.name%}</a>
                {% } else { %}
                    <span>{%=file.name%}</span>
                {% } %}
            </p>
            {% if (file.error) { %}
                <div><span class="label label-danger">Error</span> {%=file.error%}</div>
            {% } %}
        </td>
        <td>
            <span class="size">{%=o.formatFileSize(file.size)%}</span>
        </td>
        <td>
            {% if (file.deleteUrl) { %}
                <button class="btn btn-danger delete" data-type="{%=file.deleteType%}" data-url="{%=file.deleteUrl%}"{% if (file.deleteWithCredentials) { %} data-xhr-fields='{"withCredentials":true}'{% } %}>
                    <i class="glyphicon glyphicon-trash"></i>
                    <span>Delete</span>
                </button>
                <input type="checkbox" name="delete" value="1" class="toggle">
            {% } else { %}
                <button class="btn btn-warning cancel">
                    <i class="glyphicon glyphicon-ban-circle"></i>
                    <span>Cancel</span>
                </button>
            {% } %}
        </td>
    </tr>
{% } %}
</script>
<script src="js/jquery/1.10.2/jquery.min.js"></script>
<!-- The jQuery UI widget factory, can be omitted if jQuery UI is already included -->
<script src="js/vendor/jquery.ui.widget.js"></script>
<!-- The Templates plugin is included to render the upload/download listings -->
<script src="js/tmpl.min.js"></script>
<!-- The Load Image plugin is included for the preview images and image resizing functionality -->
<script src="js/load-image.all.min.js"></script>
<!-- The Canvas to Blob plugin is included for image resizing functionality -->
<script src="js/canvas-to-blob.min.js"></script>
<!-- Bootstrap JS is not required, but included for the responsive demo navigation -->
<script src="js/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<!-- blueimp Gallery script -->
<script src="js/jquery.blueimp-gallery.min.js"></script>
<!-- The Iframe Transport is required for browsers without support for XHR file uploads -->
<script src="js/jquery.iframe-transport.js"></script>
<!-- The basic File Upload plugin -->
<script src="js/jquery.fileupload.js"></script>
<!-- The File Upload processing plugin -->
<script src="js/jquery.fileupload-process.js"></script>
<!-- The File Upload image preview & resize plugin -->
<script src="js/jquery.fileupload-image.js"></script>
<!-- The File Upload audio preview plugin -->
<script src="js/jquery.fileupload-audio.js"></script>
<!-- The File Upload video preview plugin -->
<script src="js/jquery.fileupload-video.js"></script>
<!-- The File Upload validation plugin -->
<script src="js/jquery.fileupload-validate.js"></script>
<!-- The File Upload user interface plugin -->
<script src="js/jquery.fileupload-ui.js"></script>
<!-- The main application script -->
<script src="js/main.js"></script>
<!-- The XDomainRequest Transport is included for cross-domain file deletion for IE 8 and IE 9 -->
<!--[if (gte IE 8)&(lt IE 10)]>
<script src="js/cors/jquery.xdr-transport.js"></script>
<![endif]-->
</body> 
<script>
    // $('.fileupload').fileupload({
    //     // Uncomment the following to send cross-domain cookies:
    //     //xhrFields: {withCredentials: true},
    //     url: 'server/php/?fields=shirt,sweater',
    // }); 
    var fields = 'food,batching';
    $('.fileupload').fileupload({
        url: 'server/php/?fields=' + fields,
        add: function (e, data) {
            // 不用点击直接上传
            var jqXHR = data.submit()
                .success(function (result, textStatus, jqXHR) {})
                .error(function (jqXHR, textStatus, errorThrown) {})
                .complete(function (result, textStatus, jqXHR) {});
        }     
    });
  
    $.ajax({
        url: 'server/php/?fields=' + fields,
        success(data) {
            var dataObj = JSON.parse(data);
            $.each(dataObj, function(name, value) {               
                $.each(value, function(k, v){
                    var item = '<tr class="template-download fade in">';
                    item += '<td><span class="preview"><a data-gallery="" download="' + v.name + '" title="' + v.name + '" href="' + v.url + '"><img src="' + v.thumbnailUrl + '"></a></span></td><td><p class="name"><a data-gallery="" download="' + v.name + '" title="' + v.url + '" href="' + v.url + '">' + v.name + '</a></p></td><td><span class="size">' + (v.size / 1000) + ' KB</span></td><td>';
            
                    item += '<button data-url="' + v.deleteUrl + '" data-type="' + v.deleteType + '" class="btn btn-danger delete" ><i class="glyphicon glyphicon-trash"></i><span>Delete</span></button>';
                    item += ' <input type="checkbox" class="toggle" value="1" name="delete"></td></tr>';

                    var $item = $(item);
                    $input_file = eval($("input[type='file'][name='" + name + "[]']"));
                    $item.appendTo($input_file.parents('.fileupload-buttonbar').siblings('.table-striped').children('.files'));                                         
                });                    
            });                      
        }
    });
</script>
</html>

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