双层ajax嵌套（可多层）用法实例

function addbus()
{
  //清除a标签中的所有元素
  // $("#s1").remove();
  var chooseIdTypeOne =$("#chooseIdTypeOne2").find("option:selected").val();
  $.ajax({ 
  url : "/ftcms/changeProject.do?getOriginalOriginalName="+chooseIdTypeOne, 
  data : null, // 参数 
  type : "post", 
  cache : false, 
  dataType : "json", //返回json数据 
  error: function(){ 
  //document.getElementById("chooseIdTypeOnechdranone").options.length = 0;
  alert('error');  
  }, 
  success:onchangecal 
  }); 
  } 
  function onchangecal(data){
  var chooseIdTypeOne =$("#chooseIdTypeOne2").find("option:selected").val();
   document.getElementById("chooseIdTypeOnechdranone2").options.length = 0; //清空原有的option 
  var str="option value='00000'>请选择/option>";
  if(chooseIdTypeOne==1){
  $.ajax({ 
  url : "/ftcms/changeProject.do?getOriginalOriginalName="+chooseIdTypeOne, 
  data : null, // 参数 
  type : "post", 
  cache : false, 
  dataType : "json", //返回json数据 
  error: function(){ 
  //document.getElementById("chooseIdTypeOnechdranone").options.length = 0;
  alert('error');  
  }, 
  success:onchangecal 
  }); 
  } 
  } 
  }
  if(chooseIdTypeOne==2){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==3){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==4){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==5){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==6){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==7){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==8){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==9){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==10){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==11){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==12){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  if(chooseIdTypeOne==13){
  for(var i=0;idata.length;i++){ 
   str+="option value='"+data[i].UID+"'>"+data[i].NAME+"/option>"
  } 
  }
  $("#chooseIdTypeOnechdranone2").html(str);
}