jQuery 文件上传不显示预览

I have already checked (via logging) that the add callback is being called and that the uploadTemplate function is being called and returning expected values -- for some reason those values are simply not being appended to the presentation table.

$('#fileupload').fileupload(
  acceptFileTypes: /(.|/)(gif)$/i
  uploadTemplateId: null
  downloadTemplateId: null
  uploadTemplate: (obj) ->
    rows = $()
    $.each(obj.files, (idx, file) ->
      temp = "<tr class='template-upload fade'><td class='preview'><span class='fade'></span></td><td class='name'></td>'<td class='size'></td>"
      if (file.error)
        temp += "<td class='error' colspan='2'></td>"
      else
        temp += "<td><div class='progress'><div class='bar' style='width:0%;'></div></div></td><td class='start'><button>Start</button></td>"
      temp += "<td class='cancel'><button>Cancel</button></td></tr>"
      row = $(temp)
      row.find('.name').text(file.name)
      row.find('.size').text(obj.formatFileSize(file.size))
      rows = rows.add(row)
      )
    return rows
  downloadTemplate: ->
    return $()
)

2012 年 10 月 16 日更新我在fileupload的初始化中添加了以下内容:

  process: [{action: 'load', fileTypes: /^image/(gif|jpeg|png)$/, maxFileSize: 2000000}, {action: 'resize', maxWidth: 1920, maxHeight: 1200, minWidth: 800, minHeight: 600}, {action: 'save'}]