Ajax synchronous verification of the existence of a number of methods _ajax related

This article illustrates the existence of an AJAX sync validation number. Share to everyone for your reference, specific as follows:

method to execute before saving, Ajax synchronization call Background Verify parcel number exists
function Dobeforesave () {
  var Packagecode=document.getelementbyid (" PackageCode "). Value;
  var Temp=false;
  if (packagecode!= "") {
    $.ajax ({
     URL: "${ctx}/finance/packagemanagement!parcelswhetherexists.do",//Receive Page
     type: ' Post ',  //post way to send data
     async:false,  //ajax sync
     data:{packagecode:packagecode},
     Success:function (Result) {
      temp = eval (result.result);}}
    );
  if (!temp) {
   alert ("Parcel number already exists!") ");
   Toft.resetform ("Adddataform");/empty form
   toft.id ("PackageCode"). focus ();
  }
  return temp;
}

I hope this article will help you with Ajax based programming.