选择文件进行上传

<input type="file" name="upload" id="upload" class="validate[required] text-input" accept="application/msexcel" size=40>

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accept="application/msexcel"：表示只浏览Excel文件；

具体看下文：

摘自：http://blog.csdn.net/jyy_12/article/details/9851349

（IE9及以下不支持下面这些功能，其它浏览器最新版本均已支持。）

1、允许上传文件数量

允许选择多个文件：<input type="file" multiple>

只允许上传一个文件：<input  type="file" single>

2、上传指定的文件格式

<input type="file" accept="image/gif,image/png" />

这里的上传格式仅指打开上传弹窗选择文件时默认的文件格式，可手动修改成其它文件格式。

如果不限制上传图片的格式可写成：accept="image/*"

其它格式参考如下：

*.3gpp	audio/3gpp, video/3gpp	3GPP Audio/Video
*.ac3	audio/ac3	AC3 Audio
*.asf	allpication/vnd.ms-asf	Advanced Streaming Format
*.au	audio/basic	AU Audio
*.css	text/css	Cascading Style Sheets
*.csv	text/csv	Comma Separated Values
*.doc	application/msword	MS Word Document
*.dot	application/msword	MS Word Template
*.dtd	application/xml-dtd	Document Type Definition
*.dwg	image/vnd.dwg	AutoCAD Drawing Database
*.dxf	image/vnd.dxf	AutoCAD Drawing Interchange Format
*.gif	image/gif	Graphic Interchange Format
*.htm	text/html	HyperText Markup Language
*.html	text/html	HyperText Markup Language
*.jp2	image/jp2	JPEG-2000
*.jpe	image/jpeg	JPEG
*.jpeg	image/jpeg	JPEG
*.jpg	image/jpeg	JPEG
*.js	text/javascript, application/javascript	JavaScript
*.json	application/json	JavaScript Object Notation
*.mp2	audio/mpeg, video/mpeg	MPEG Audio/Video Stream, Layer II
*.mp3	audio/mpeg	MPEG Audio Stream, Layer III
*.mp4	audio/mp4, video/mp4	MPEG-4 Audio/Video
*.mpeg	video/mpeg	MPEG Video Stream, Layer II
*.mpg	video/mpeg	MPEG Video Stream, Layer II
*.mpp	application/vnd.ms-project	MS Project Project
*.ogg	application/ogg, audio/ogg	Ogg Vorbis
*.pdf	application/pdf	Portable Document Format
*.png	image/png	Portable Network Graphics
*.pot	application/vnd.ms-powerpoint	MS PowerPoint Template
*.pps	application/vnd.ms-powerpoint	MS PowerPoint Slideshow
*.ppt	application/vnd.ms-powerpoint	MS PowerPoint Presentation
*.rtf	application/rtf, text/rtf	Rich Text Format
*.svf	image/vnd.svf	Simple Vector Format
*.tif	image/tiff	Tagged Image Format File
*.tiff	image/tiff	Tagged Image Format File
*.txt	text/plain	Plain Text
*.wdb	application/vnd.ms-works	MS Works Database
*.wps	application/vnd.ms-works	Works Text Document
*.xhtml	application/xhtml+xml	Extensible HyperText Markup Language
*.xlc	application/vnd.ms-excel	MS Excel Chart
*.xlm	application/vnd.ms-excel	MS Excel Macro
*.xls	application/vnd.ms-excel	MS Excel Spreadsheet
*.xlt	application/vnd.ms-excel	MS Excel Template
*.xlw	application/vnd.ms-excel	MS Excel Workspace
*.xml	text/xml, application/xml	Extensible Markup Language
*.zip	aplication/zip	Compressed Archive

这里要慎重说明的是：网上好多教程都说 excel过滤要用“accept="application/msexcel"” ，其实是大错特错！测试了，不行！ 我也是在做phpExcel导出excel文件是，看到了，有一行代码：

header(‘Content-Type: application/vnd.ms-excel‘);   //excel 2003

header(‘Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet‘);  //excel 2007

我才明白，原来 .xls 格式的文件，要用这个 MIME 类型。 测试，成功！

html5表单上传控件Files筛选指定格式的文件：accept属性过滤excel文件

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原文：http://www.cnblogs.com/voiphudong/p/4276236.html