AjaxFileUpload是用一个使用Ajax上传指定表单元素文件的jQuery插件，实现原理为创建一个iframe，将制定表单提交到iframe，然后再做进一步处理。
使用方法
1.引入jquery.js和ajaxfileupload.js 2.创建文件上传函数，如：function ajaxFileUpload() {
//starting setting some animation when the ajax starts and completes
$("#loading")
.ajaxStart(function () {
$(this).show();
})
.ajaxComplete(function () {
$(this).hide();
});
/*
prepareing ajax file upload
url: the url of script file handling the uploaded files
fileElementId: the file type of input element id and it will be the index of $_FILES Array()
dataType: it support json, xml
secureuri:use secure protocol
success: call back function when the ajax complete
error: callback function when the ajax failed
*/
$.ajaxFileUpload
(
{
url:'doajaxfileupload.php',
secureuri:false,
fileElementId:'fileToUpload',
dataType:'json',
success:function (data, status) {
if (typeof(data.error) != 'undefined') {
if (data.error != '') {
alert(data.error);
} else {
alert(data.msg);
}
}
},
error:function (data, status, e) {
alert(e);
}
}
)
return false;
}
