js方法实现--上传文件功能js实现

function createuploadform(fileelementid, data, curfilelist) {
    var id = new date().gettime();
    var formid = 'juploadform' + id; //给form添加一个独一无二的id
    var form = jquery('<form  action="" method="post" name="' + formid + '" id="' + formid + '" enctype="multipart/form-data" ></form>'); //创建form元素
    if (data) {
        for (var i in data) {
            jquery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendto(form);
        }
    }

    //set attributes
    jquery(form).css('position', 'absolute'); //给动态form添加样式，使其浮动起来，
    jquery(form).css('top', '-1200px');
    jquery(form).css('left', '-1200px');
    jquery(form).appendto('body'); //把动态form插入到body中

    var fd = new formdata($('#' + formid)[0]);
    for (var i = 0; i < curfilelist.length; ++i) {
        fd.append('file[]', curfilelist[i]);
    }
    return fd;
}


使用方法:
var fd = createuploadform("file" + row, { entityname: entityname, entityid: id, userid: userid, listname: rowdata.listname }, curfilelist);
                $.ajax({
                    url: clienturl + '/uploadfile/upload.html',
                    type: "post",
                    data: fd,
                    datatype: "json",
                    processdata: false,
                    contenttype: false,
                    success: function (data) {
                        $('#trackrecordtable').bootstraptable('hideloading');
                        $('#trackrecordtable').bootstraptable('refresh');
                        alert(data.msg);
                    },
                    error: function (data) {
                        $('#trackrecordtable').bootstraptable('hideloading');

                        var result = eval('(' + data.responsetext + ')');
                        alert(result.msg);
                    }
                });