一、input:file属性
属性值有以下几个比较常用:
accept:表示可以选择的文件MIME类型,多个MIME类型用英文逗号分开,常用的MIME类型见下表。
multiple:是否可以选择多个文件,多个文件时其value值为第一个文件的虚拟路径。
1、accept
只能选择png和gif图片
<input id="fileId1" type="file" accept="image/png,image/gif" name="file" />
2、multiple
多文件上传
<input id="fileId2" type="file" multiple="multiple" name="file" />
3、常用MIME类型
后缀名 MIME名称
*.3gpp audio/3gpp, video/3gpp
*.ac3 audio/ac3
*.asf allpication/vnd.ms-asf
*.au audio/basic
*.css text/css
*.csv text/csv
*.doc application/msword
*.dot application/msword
*.dtd application/xml-dtd
*.dwg image/vnd.dwg
*.dxf image/vnd.dxf
*.gif image/gif
*.htm text/html
*.html text/html
*.jp2 image/jp2
*.jpe image/jpeg
*.jpeg image/jpeg
*.jpg image/jpeg
*.js text/javascript, application/javascript
*.json application/json
*.mp2 audio/mpeg, video/mpeg
*.mp3 audio/mpeg
*.mp4 audio/mp4, video/mp4
*.mpeg video/mpeg
*.mpg video/mpeg
*.mpp application/vnd.ms-project
*.ogg application/ogg, audio/ogg
*.pdf application/pdf
*.png image/png
*.pot application/vnd.ms-powerpoint
*.pps application/vnd.ms-powerpoint
*.ppt application/vnd.ms-powerpoint
*.rtf application/rtf, text/rtf
*.svf image/vnd.svf
*.tif image/tiff
*.tiff image/tiff
*.txt text/plain
*.wdb application/vnd.ms-works
*.wps application/vnd.ms-works
*.xhtml application/xhtml+xml
*.xlc application/vnd.ms-excel
*.xlm application/vnd.ms-excel
*.xls application/vnd.ms-excel
*.xlt application/vnd.ms-excel
*.xlw application/vnd.ms-excel
*.xml text/xml, application/xml
*.zip aplication/zip
*.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
二、样式美化
请看博客:css input[type=file] 样式美化,input上传按钮美化
http://www.haorooms.com/post/css_input_uploadmh
三、AJAX上传文件
在说到ajax上传文件。ajax上传的时候,需要获得input:file选择的文件(可能为多个文件),获取其文件列表为:
// input标签的files属性
document.querySelector("#fileId").files
// 返回的是一个文件列表数组
获得的文件列表,然后遍历插入到表单数据当中。即:
// 获得上传文件DOM对象
var oFiles = document.querySelector("#fileId");
// 实例化一个表单数据对象
var formData = new FormData();
// 遍历图片文件列表,插入到表单数据中
for (var i = 0, file; file = oFiles[i]; i++) {
// 文件名称,文件对象
formData.append(file.name, file);
}
获得表单数据之后,就可以用ajax的POST上传。
// 实例化一个AJAX对象
var xhr = new XMLHttpRequest();
xhr.onload = function() {
alert("上传成功!");
}
xhr.open("POST", "upload.php", true);
// 发送表单数据
xhr.send(formData);
上传到服务器之后,获取到文件列表为:
Array
(
[jpg_jpg] => Array
(
[name] => jpg.jpg
[type] => image/jpeg
[tmp_name] => D:\xampp\tmp\phpA595.tmp
[error] => 0
[size] => 133363
)
[png_png] => Array
(
[name] => png.png
[type] => image/png
[tmp_name] => D:\xampp\tmp\phpA5A6.tmp
[error] => 0
[size] => 1214628
)
)
在服务端循环遍历这个数组就可以上传文件了。