使用jQuery.FileUpload插件和Backload组件裁剪上传图片

时间:2021-10-04 07:29:18

□ 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
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

→在"程序包管理器控制台"输入: Install-Package JQuery_File_Upload_Plugin
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

□ 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="/"></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>
}

□ 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:
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

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:
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

□ 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:
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

由于设置了path="_thumb",所以有了缩略图文件夹:
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

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:
使用jQuery.FileUpload插件和Backload组件裁剪上传图片

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