MVC文件上传06-使用客户端jQuery-File-Upload插件和服务端Backload组件自定义控制器上传多个文件

2022-04-05 18:18:27

当需要在控制器中处理除了文件的其他表单字段，执行控制器独有的业务逻辑......等等，这时候我们可以自定义控制器。

通过继承BackloadController

□ 思路

BackloadController的HandleRequestAsync()方法可以用来处理异步请求，通过继承BackloadController，子类也有了处理异步文件请求的能力。客户端方面，需要一个指向自定义控制器的初始化js文件。

□ FileUploadDerivedController继承BackloadController

   1:      public class FileUploadDerivedController : BackloadController

   2:      {

   3:          public ActionResult Index()

   4:          {

   5:              return View();

   6:          }

7:

   8:          public async Task<ActionResult> FileHandler()

   9:          {

  10:              ActionResult result = await base.HandleRequestAsync();

  11:              return result;

  12:          }

  13:      }

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□ 创建一个指向自定义控制器的js文件main.js

   1:  $(function () {

   2:      'use strict';

3:

   4:      var fileUploadUrl = "/FileUploadDerived/FileHandler";

5:

   6:      // Initialize the jQuery File Upload widget:

   7:      $('#fileupload').fileupload({

   8:          url: fileUploadUrl,

   9:          acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i // Allowed file types

  10:      });

11:

  12:      // Optional: Initial ajax request to load already existing files.

  13:      $.ajax({

  14:          url: fileUploadUrl,

  15:          dataType: 'json',

  16:          context: $('#fileupload')[0]

  17:      })

  18:      .done(function (result) {

  19:          $(this).fileupload('option', 'done')

  20:              .call(this, null, { result: result });

  21:          // Attach the Colorbox plugin to the image files to preview them in a modal window. Other file types (e.g. pdf) will show up in a

  22:          // new browser window.

  23:          $(".files tr[data-type=image] a").colorbox();

  24:      });

25:

26:

  27:      // Initialize the jQuery ui theme switcher:

  28:      $('#theme-switcher').change(function () {

  29:          var theme = $('#theme');

  30:          theme.prop(

  31:              'href',

  32:              theme.prop('href').replace(

  33:                  /[\w\-]+\/jquery-ui.css/,

  34:                  $(this).val() + '/jquery-ui.css'

  35:              )

  36:          );

  37:      });

  38:  });

39:

40:

  41:  $("document").ready(function () {

  42:      // The Colorbox plugin needs to be informed on new uploaded files in the template in order to bind a handler to it.

  43:      // There must be a little delay, because the fileuploaddone event is triggered before the new template item is created.

  44:      // A more elegant solution would be to use jQuery's delegated .on method, which automatically binds to the anchors in a

  45:      // newly created template item, and then call colorbox manually.

  46:      $('#fileupload').bind('fileuploaddone', function(e, data) {

  47:          setTimeout(function() { $(".files tr[data-type=image] a").colorbox() }, 1000);

  48:      });

  49:  });

50:

□ 其中用到了colorbox插件

install-package colorbox

□ FileUploadDerived/Index.cshtml视图

展开@{

    ViewBag.Title = "Index";

    Layout = "~/Views/Shared/_Layout.cshtml";

}

    <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="/"></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">&nbsp;</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="{%=file.url%}" title="{%=file.name%}" data-gallery="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>

                        {% } %}

                    </span>

                </td>

                <td>

                    <p class="name">

                        <a href="{%=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="1" class="toggle">

                </td>

            </tr>

        {% } %}

        </script>

    </div>

@section scripts

{

    @* <script src="~/Scripts/FileUpload/backload.demo.js"></script>*@

    <script src="~/Scripts/main.js"></script>

}

□ 在web.config中设置目的文件夹CustomerController

   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" />

   5:    </configSections>

6:

   7:     <backload xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:fileupload-schema" xsi:noNamespaceSchemaLocation="Web.FileUpload.xsd">

   8:      <fileSystem filesRoot="~/CustomerController" />

   9:    </backload>

  10:  </configuration>

□ 结果

上传界面：

CustomerController文件夹：

CustomerController文件夹内容：

通过为FileUploadHandler的事件IncomingRequestStarted注册方法

□ 思路

为FileUploadHandler的事件IncomingRequestStarted注册方法，再让事件处理异步文件请求。客户端方面，需要一个指向自定义控制器的初始化js文件。

□ FileUploadInstanceController

   1:     public class FileUploadInstanceController : Controller

   2:      {

   3:          public ActionResult Index()

   4:          {

   5:              return View();

   6:          }

7:

   8:          public async Task<ActionResult> FileHandler()

   9:          {

  10:              FileUploadHandler handler = new FileUploadHandler(Request, this);

  11:              handler.IncomingRequestStarted += handler_IncomingRequestStarted;

  12:              ActionResult result = await handler.HandleRequestAsync();

  13:              return result;

  14:          }

15:

  16:          void handler_IncomingRequestStarted(object sender, Backload.Eventing.Args.IncomingRequestEventArgs e)

  17:          {

  18:              //禁止添加操作

  19:              if (e.Context.HttpMethod == "PUT")

  20:              {

  21:                  e.Context.PipelineControl.ExecutePipeline = false;

  22:              }

  23:          }

  24:      }

25:

□ 创建一个指向自定义控制器的js文件main.js

   1:  $(function () {

   2:      'use strict';

3:

   4:      var fileUploadUrl = "/FileUploadInstance/FileHandler";

5:

6:

   7:      // Initialize the jQuery File Upload widget:

   8:      $('#fileupload').fileupload({

   9:          url: fileUploadUrl,

  10:          acceptFileTypes: /(jpg)|(jpeg)|(png)|(gif)$/i // Allowed file types

  11:      });

12:

  13:      // Optional: Initial ajax request to load already existing files.

  14:      $.ajax({

  15:          url: fileUploadUrl,

  16:          dataType: 'json',

  17:          context: $('#fileupload')[0]

  18:      })

  19:      .done(function (result) {

  20:          $(this).fileupload('option', 'done')

  21:              .call(this, null, { result: result });

  22:          // Attach the Colorbox plugin to the image files to preview them in a modal window. Other file types (e.g. pdf) will show up in a

  23:          // new browser window.

  24:          $(".files tr[data-type=image] a").colorbox();

  25:      });

26:

27:

28:

  29:      // Initialize the jQuery ui theme switcher:

  30:      $('#theme-switcher').change(function () {

  31:          var theme = $('#theme');

  32:          theme.prop(

  33:              'href',

  34:              theme.prop('href').replace(

  35:                  /[\w\-]+\/jquery-ui.css/,

  36:                  $(this).val() + '/jquery-ui.css'

  37:              )

  38:          );

  39:      });

  40:  });

41:

42:

  43:  $("document").ready(function () {

  44:      // The Colorbox plugin needs to be informed on new uploaded files in the template in order to bind a handler to it.

  45:      // There must be a little delay, because the fileuploaddone event is triggered before the new template item is created.

  46:      // A more elegant solution would be to use jQuery's delegated .on method, which automatically binds to the anchors in a

  47:      // newly created template item, and then call colorbox manually.

  48:      $('#fileupload').bind('fileuploaddone', function(e, data) {

  49:          setTimeout(function() { $(".files tr[data-type=image] a").colorbox() }, 1000);

  50:      });

  51:  });

52:

□ FileUploadInstance/Index.cshtml视图

同上

□ 在web.config中设置目的文件夹FileUpload

   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" />

   5:    </configSections>

6:

   7:     <backload xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:fileupload-schema" xsi:noNamespaceSchemaLocation="Web.FileUpload.xsd">

   8:      <fileSystem filesRoot="~/FileUpload" />

   9:    </backload>

  10:  </configuration>

□ 结果

上传界面：

FileUpload文件夹：

FileUpload文件夹内容：

参考资料：
※ http://backload.org/ Backload官网
※ https://github.com/blackcity/Backload#examples Backload例子
※ http://nuget.org/packages/Backload/ nuget上的Backload

※ http://blueimp.github.io/jQuery-File-Upload/ jQuery File Upload官网
※ https://github.com/blueimp/jQuery-File-Upload/wiki github上的jQuery File Upload介绍
※ https://github.com/blueimp/jQuery-File-Upload github上的jQuery File Upload源码

※ https://www.nuget.org/packages/JQueryFileUpload_Demo_with_Backload/ 下载jQuery File Upload结合Backload的MVC案例

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