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使用jQuery.FileUpload插件和Backload组件裁剪上传图片
□ 思路
1、自定义控制器继承Backload的默认控制器BackloadController
2、自定义一个jQuery File Upload初始化js文件，使用自定义控制器的方法
3、在视图页面调用自定义jQuery File Upload初始化js文件
□ 安装Backload组件和jQuery File Upload插件
→在"程序包管理器控制台"输入：Install-Package Backload
→在"程序包管理器控制台"输入： Install-Package JQuery_File_Upload_Plugin
□ 自定义BaseController继承BackloadController
1: using System.Web.Mvc; 2: 3: namespace MvcApplication7.Controllers 4: { 5: public class BaseController : BackloadController 6: { 7: //public ActionResult Index() 8: //{ 9: // return View(); 10: //} 11: 12: public async Task<ActionResult> FileHandler() 13: { 14: ActionResult result = await base.HandleRequestAsync(); 15: return result; 16: } 17: } 18: }□ 自定义HomeController继承BaseController
1: using System.Web.Mvc; 2: namespace MvcApplication7.Controllers 3: { 4: public class HomeController : BaseController 5: { 6: public ActionResult Index() 7: { 8: return View(); 9: } 10: } 11: }□ 自定义用于初始化jQuery File Upload的js文件main.js
其中，还限制了上传文件的格式。
1: $(function () { 2: ‘use strict‘; 3: 4: var url = ‘/Base/FileHandler‘; 5: // Initialize the jQuery File Upload widget: 6: $(‘#fileupload‘).fileupload({ 7: // Uncomment the following to send cross-domain cookies: 8: //xhrFields: {withCredentials: true}, 9: url: url, 10: acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i // Allowed file types 11: }); 12: 13: // Enable iframe cross-domain access via redirect option: 14: $(‘#fileupload‘).fileupload( 15: ‘option‘, 16: ‘redirect‘, 17: window.location.href.replace( 18: /\/[^\/]*$/, 19: ‘/cors/result.html?%s‘ 20: ) 21: ); 22: 23: // Load existing files by an initial ajax request to the server after page loads up 24: // This is done by a simple jQuery ajax call, not by the FIle Upload plugin., 25: // but the results are passed to the plugin with the help of the context parameter: 26: // context: $(‘#fileupload‘)[0] and the $(this)... call in the done handler. 27: // With ajax.context you can pass a JQuery object to the event handler and use "this". 28: $(‘#fileupload‘).addClass(‘fileupload-processing‘); 29: $.ajax({ 30: // Uncomment the following to send cross-domain cookies: 31: //xhrFields: {withCredentials: true}, 32: url: url, 33: dataType: ‘json‘, 34: context: $(‘#fileupload‘)[0] 35: }).always(function () { 36: $(this).removeClass(‘fileupload-processing‘); 37: }).done(function (result) { 38: $(this).fileupload(‘option‘, ‘done‘) 39: .call(this, null, { result: result }); 40: }); 41: }); 42: 43: $("document").ready(function () { 44: $(‘#fileupload‘) 45: .bind(‘fileuploaddestroy‘, function (e, data) { 46: // Event handler example. Do something if you need after file has been deleted on the server. 47: // (Refer to the client side documentatio). 48: }); 49: 50: }); 51: □ _Layout.cshtml布局视图
1: <!DOCTYPE html> 2: <html> 3: <head> 4: <meta charset="utf-8" /> 5: <meta name="viewport" content="width=device-width" /> 6: <title>@ViewBag.Title</title> 7: @Styles.Render("~/Content/css") 8: @Styles.Render("~/Content/themes/base/css") 9: @Styles.Render("~/bundles/fileupload/bootstrap/BasicPlusUI/css") 10: @Scripts.Render("~/bundles/modernizr") 11: </head> 12: <body> 13: @RenderBody() 14: 15: @Scripts.Render("~/bundles/jquery") 16: @Scripts.Render("~/bundles/jqueryui") 17: @Scripts.Render("~/bundles/fileupload/bootstrap/BasicPlusUI/js") 18: @RenderSection("scripts", required: false) 19: </body> 20: </html> 21: □ Home/Index.cshtml视图
@{ ViewBag.Title = "Index"; Layout = "~/Views/Shared/_Layout.cshtml";}<style type="text/css"> .table-striped { width: 65%; }</style><div> <!-- The file upload form used as target for the file upload widget --> <form id="fileupload" action="/Backload/UploadHandler" method="POST" enctype="multipart/form-data"> <!-- Redirect browsers with JavaScript disabled to the origin page --> <noscript><input type="hidden" name="redirect" value="http://www.mamicode.com/"></noscript> <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload --> <div class="row fileupload-buttonbar"> <div class="span7"> <!-- The fileinput-button span is used to style the file input field as button --> <span class="btn btn-success fileinput-button"> <i class="icon-plus icon-white"></i> <span>添加文件...</span> <input type="file" name="files[]" multiple> </span> <button type="submit" class="btn btn-primary start"> <i class="icon-upload icon-white"></i> <span>开始上传</span> </button> <button type="reset" class="btn btn-warning cancel"> <i class="icon-ban-circle icon-white"></i> <span>取消上传</span> </button> <button type="button" class="btn btn-danger delete"> <i class="icon-trash icon-white"></i> <span>删除</span> </button> <input type="checkbox" class="toggle"> <!-- The loading indicator is shown during file processing --> <span class="fileupload-loading"></span> </div> <!-- The global progress information --> <div class="span5 fileupload-progress fade"> <!-- The global progress bar --> <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100"> <div class="bar" style="width:0%;"></div> </div> <!-- The extended global progress information --> <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" data-toggle="modal-gallery" data-target="#modal-gallery"></tbody></table> </form> <!-- 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> {% if (file.error) { %} <div><span class="label label-important">Error</span> {%=file.error%}</div> {% } %} </td> <td> <p class="size">{%=o.formatFileSize(file.size)%}</p> {% if (!o.files.error) { %} <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="bar" style="width:0%;"></div></div> {% } %} </td> <td> {% if (!o.files.error && !i && !o.options.autoUpload) { %} <button class="btn btn-primary start"> <i class="icon-upload icon-white"></i> <span>Start</span> </button> {% } %} {% if (!i) { %} <button class="btn btn-warning cancel"> <i class="icon-ban-circle icon-white"></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.thumbnail_url) { %} <a href="http://www.mamicode.com/{%=file.url%}" title="{%=file.name%}" data-gallery="gallery" download="{%=file.name%}"><img src="http://www.mamicode.com/{%=file.thumbnail_url%}"></a> {% } %} </span> </td> <td> <p class="name"> <a href="http://www.mamicode.com/{%=file.url%}" title="{%=file.name%}" data-gallery="{%=file.thumbnail_url&&‘gallery‘%}" download="{%=file.name%}">{%=file.name%}</a> </p> {% if (file.error) { %} <div><span class="label label-important">Error</span> {%=file.error%}</div> {% } %} </td> <td> <span class="size">{%=o.formatFileSize(file.size)%}</span> </td> <td> <button class="btn btn-danger delete" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}"{% if (file.delete_with_credentials) { %} data-xhr-fields=‘{"withCredentials":true}‘{% } %}> <i class="icon-trash icon-white"></i> <span>Delete</span> </button> <input type="checkbox" name="delete" value="http://www.mamicode.com/1" class="toggle"> </td> </tr> {% } %} </script> </div>@section scripts{ @* <script src="http://www.mamicode.com/~/Scripts/FileUpload/backload.demo.js"></script>*@ <script src="http://www.mamicode.com/~/Scripts/main.js"></script>}
□ web.config
1: <configuration> 2: <configSections> 3: ... 4: <section name="backload" type="Backload.Configuration.BackloadSection, Backload, Version=1.9.3.1, Culture=neutral, PublicKeyToken=02eaf42ab375d363" requirePermission="false" /></configSections> 5: <configSections> 6: <backload configSource="Web.backload.config" /> 7: </configuration>□ 所有Backload的配置放在Web.backload.config中
1: <?xml version="1.0"?> 2: 3: <backload xsi:noNamespaceSchemaLocation="Web.Backload.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:backload-schema" thumbsUrlPattern="{Backload}"> 4: 5: <images width="200" height="200" dpi="96" resizeMode="ratio" /> 6: <thumbnails path="" width="60" height="60" canvasColor="#00000000" resizeMode="place" imageType="image/png" /> 7: <fileSystem filesRoot="~/Upload" /> 8: <cacheManager lastModified="true" etag="true"/> 9: </backload>● width和height实际上设置的是画布Canvas的大小。
● 没有resizeMode属性：保持上传图片的大小不变
● resizeMode="ration": 当图片的宽度大于画布的宽度，图片的宽度修剪为画布的宽度，图片的高度等比例缩放，画布背景不显示
● resizeMode="fit": 当图片的宽度大于画布的宽度，图片的宽度修剪为画布的宽度，图片的高度等比例缩放，画布背景显示
● resizeMode="place": 当图片的宽度小于画布的宽度，图片的宽度修剪为画布的宽度，图片的高度等比例缩放，画布背景显示
● resizeMode="crop": 图片的宽度或高度充满画布的宽度或高度，空白的画布区域裁剪掉。
□ 结果
上传界面：
由于设置了path=""，所以没有了缩略图：
由于设置了resizeMode="ratio"，上传图片宽度不变，高度按比例缩小：
□ 设置文件夹带缩略图文件夹path="_thumb"
1: <backload xsi:noNamespaceSchemaLocation="Web.Backload.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:backload-schema" thumbsUrlPattern="{Backload}"> 2: 3: <images width="200" height="200" dpi="96" resizeMode="ratio" /> 4: <thumbnails path="_thumb" width="60" height="60" canvasColor="#00000000" resizeMode="place" imageType="image/png" /> 5: <fileSystem filesRoot="~/Upload" /> 6: <cacheManager lastModified="true" etag="true"/> 7: </backload>增加一个图片：
由于设置了path="_thumb"，所以有了缩略图文件夹：
由于缩略图设置了resizeMode="place"，图片宽度等于画布宽度，高度等比例缩放，显示背景：
由于在main.js中设置了acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i，pdf格式不允许：
使用jQuery.FileUpload插件和Backload组件裁剪上传图片
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