//ajax异步上传
$.ajax({
url: "${pageContext.request.contextPath }/upload",
type: "POST",
data: formData,
xhr: function(){ //获取ajaxSettings中的xhr对象,为它的upload属性绑定progress事件的处理函数
myXhr = $.ajaxSettings.xhr();
if(myXhr.upload){ //检查upload属性是否存在
//绑定progress事件的回调函数
myXhr.upload.addEventListener('progress',progressHandlingFunction, false);
}
return myXhr; //xhr对象返回给jQuery使用
},
success: function(result){
$("#result").html(result);
},
contentType: false, //必须false才会自动加上正确的Content-Type
processData: false //必须false才会避开jQuery对 formdata 的默认处理
});
//上传进度回调函数:
function progressHandlingFunction(e) {
if (e.lengthComputable) {
$('#progress').attr({value : e.loaded, max : e.total}); //更新数据到进度条
var percent = e.loaded/e.total*100;
$('#progress').html(e.loaded + "/" + e.total+" bytes. " + percent.toFixed(2) + "%");
$('#progress').css('width', percent.toFixed(2) + "%");
}
}