Ajax realizes the most basic concept of three-level linkage-JS Tutorial-php.cn

Ajax realizes the most basic concept of three-level linkage

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Release： 2018-04-02 14:55:51

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This time I will bring you the most basic concept of ajax to achieve three-level linkage. What are the precautions for ajax to achieve three-level linkage. The following is a practical case, let's take a look.

The example in this article shares the specific code of ajax to achieve three-level linkage for your reference. The specific content is as follows

1. First, place a p on a page to facilitate future reference methods

<body>
<p id="sanji">//p的id为“sanji”
</p>

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2.sanji js processing page

$(document).ready(function(){
    
   //向p里面放三个下拉菜单
  var str = "<select id=&#39;sheng&#39;></select>
    <select id=&#39;shi&#39;></select>
    <select id=&#39;qu&#39;></select>";
  //给三个下拉列表定义 str 变量
  
  $("#sanji").html(str);
  FillSheng();
  FillShi();
  FillQu();//Sheng Shi Qu的逻辑顺序 
  
   $("#sheng").change(function(){
     FillShi();
     FillQu();
   })//给sheng菜单添加点击事件
   $("#shi").change(function(){
   FillQu();
  })//给shi菜单添加点击事件
});//页面加载完成之后过来执行某些代码

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3.Fill sheng method

function FillSheng()
{
 
  var pcode = "";//定义一个变量
  $.ajax({
     
     url:"chuli.php",
     data:{pcode:pcode},
     type:"POST",
     dataType:"TEXT",
     success:function(data){
              var hang = data.split("^");
              str +="<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
      }
     $("#sheng").html(str);
     });
}

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2.Fill shi method

function FillShi()
{
 var pcode = $("#sheng").val();
 $.ajax({
   async:false,
   url:"chuli.php",
   data:{pcode:pcode},
   type:"POST",
   dataType:"TEXT",
   success: function(data){
     var hang = data.split("|");
     var str = "";
     for(var i=0;i<hang.length;i++)
     {
      var lie = hang[i].split("^");
      str += "<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
     }
     $("#shi").html(str);
    }
  });
}

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3.Fill qu method

function FillQu()
{
 var pcode = $("#shi").val();
 $.ajax({
   url:"chuli.php",
   data:{pcode:pcode},
   type:"POST",
   dataType:"TEXT",
   success: function(data){
     var hang = data.split("|");
     var str = "";
     for(var i=0;i<hang.length;i++)
     {
      var lie = hang[i].split("^");
      str += "<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
     }
     $("#qu").html(str);
    }
  });
}

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4.chuli page

<?php
include("DBDA.class.php");
$db = new DBDA();
$pcode = $_POST["pcode"];
$sql = "select * from chinastates where parentareacode=&#39;{$pcode}&#39;";
echo $db->StrQuery($sql);

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!