javascript ajax，表单提交然后页面加载

我正在尝试使用javascript验证表单。一旦执行了下面的代码，我想从外部脚本中获取php，以便在没有页面加载的情况下运行，并在之后显示成功消息。有人能帮忙吗？

下面的脚本运行良好，并从一个单独的函数中提取notEmpty。我需要脚本，然后：1.如果没有产生错误，则提取php并从列出的每个值中传输数据。2.显示成功消息

var year = document.getElementById('year');
var period = document.getElementById('period');
var live = document.getElementById('live');
var start = document.getElementById('start');
var todate = document.getElementById('todate');
var sdeadline = document.getElementById('sdeadline');
var cdeadline = document.getElementById('cdeadline');
var circ = document.getElementById('circ');
var line = document.getElementById('line');
// Check each input in the order that it appears in the form!
if(notEmpty(year, "Please fill in Year")){
if(notEmpty(period, "Please fill in Period")){
if(notEmpty(live, "Please fill in live Date")){
if(notEmpty(start, "Please fill in Start Date")){
if(notEmpty(todate, "Please fill in End Date")){
if(notEmpty(sdeadline, "Please fill in Supplier Deadline")){
if(notEmpty(cdeadline, "Please fill in Commerical Deadline")){
if(notEmpty(circ, "Please fill in Circulars Due")){
if(notEmpty(line, "Please fill in Line Listing Downloads")){
}}}}}}}}}

return false;