Simple implementation method of Ajax product classification three-level linkage

This article mainly brings you a simple implementation (case) of three-level linkage of Ajax product classification. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Idea analysis:

Effect: When the page loads, use ajax to asynchronously request data from the background and load the first-level product category , when selecting the first-level product, load the second-level product, and when selecting the second-level product, load the third-level product.

Implementation:

#1. After getting the data, load the product with pid 0, and dynamically create an option to add the product Go to the first-level menu and set the value

2. When selecting the first-level product, load the product with pid = current id, and create an option to append the product to the second-level menu and set the value Value

3. When selecting a second-level product, load the product with pid = current id, create an option to append the product to the third-level menu, and set the value

Page effect:

##

$(function(){
      //请求路径
      var url="03goods.php";
      //option默认内容
      var option="<option value=&#39;0&#39;>未选择</option>";
      //获取jq对象
      var $sel1=$(".sel1");
      var $sel2=$(".sel2");
      var $sel3=$(".sel3");
      //自动生成一个<option>元素
      function createOption(value,text){
        var $option=$("<option></option>");
        $option.attr("value",value);
        $option.text(text);
        return $option;
      }
      //加载数据
      function ajaxSelect($select,id){
        //get请求
        $.get(url,{"pid":id},function(data){
          $select.html(option);
          for(var k in data ){
            $select.append(createOption(data[k].id,data[k].name));
          }
        },"json");
      }

      //自动加载第一个下拉菜单
      ajaxSelect($sel1,"0");

      //选择第一个下拉菜单时加载第二个
      $sel1.change(function(){
        var id=$sel1.val();
        if(id=="0"){
          $sel2.html(option);
          $sel3.html(option);
        }else{
          ajaxSelect($sel2,id);
        }
      });

      //选择第二个下拉菜单时加载第三个
      $sel2.change(function(){
        var $id=$sel2.val();
        if($id=="0"){
          $sel3.html(option);
        }else{
          ajaxSelect($sel3,$id);
        }
      });
    });

Backend code:

<?php
  header(&#39;Content-Type:text/html; charset=utf-8&#39;);
  //数据
  $arr=array(
   //array(分类id,分类名，分类的父id)
   array(&#39;id&#39;=>&#39;1&#39;,&#39;name&#39;=>&#39;数码产品&#39;,&#39;pid&#39;=>&#39;0&#39;),
   array(&#39;id&#39;=>&#39;2&#39;,&#39;name&#39;=>&#39;家电&#39;,&#39;pid&#39;=>&#39;0&#39;),
   array(&#39;id&#39;=>&#39;3&#39;,&#39;name&#39;=>&#39;书籍&#39;,&#39;pid&#39;=>&#39;0&#39;),
   array(&#39;id&#39;=>&#39;4&#39;,&#39;name&#39;=>&#39;服装&#39;,&#39;pid&#39;=>&#39;0&#39;),
   array(&#39;id&#39;=>&#39;5&#39;,&#39;name&#39;=>&#39;手机&#39;,&#39;pid&#39;=>&#39;1&#39;),
   array(&#39;id&#39;=>&#39;6&#39;,&#39;name&#39;=>&#39;笔记本&#39;,&#39;pid&#39;=>&#39;1&#39;),
   array(&#39;id&#39;=>&#39;7&#39;,&#39;name&#39;=>&#39;平板电脑&#39;,&#39;pid&#39;=>&#39;1&#39;),
   array(&#39;id&#39;=>&#39;8&#39;,&#39;name&#39;=>&#39;智能手机&#39;,&#39;pid&#39;=>&#39;5&#39;),
   array(&#39;id&#39;=>&#39;9&#39;,&#39;name&#39;=>&#39;功能机&#39;,&#39;pid&#39;=>&#39;5&#39;),
   array(&#39;id&#39;=>&#39;10&#39;,&#39;name&#39;=>&#39;电视机&#39;,&#39;pid&#39;=>&#39;2&#39;),
   array(&#39;id&#39;=>&#39;11&#39;,&#39;name&#39;=>&#39;电冰箱&#39;,&#39;pid&#39;=>&#39;2&#39;),
   array(&#39;id&#39;=>&#39;12&#39;,&#39;name&#39;=>&#39;智能电视&#39;,&#39;pid&#39;=>&#39;10&#39;),
   array(&#39;id&#39;=>&#39;13&#39;,&#39;name&#39;=>&#39;编程书籍&#39;,&#39;pid&#39;=>&#39;3&#39;),
   array(&#39;id&#39;=>&#39;14&#39;,&#39;name&#39;=>&#39;JavaScript&#39;,&#39;pid&#39;=>&#39;13&#39;),
  );
  //获取指定分类的商品
  function getByPid($arr,$pid){
    $result=array();
    foreach($arr as $v){
      if($v[&#39;pid&#39;]==$pid){
       $result[]=$v;
      }
    }
    return $result;
  }
  //获取请求参数
  $pid=isset($_GET[&#39;pid&#39;])?$_GET[&#39;pid&#39;]:&#39;0&#39;;

  $result=getByPid($arr,$pid);
  //输出json数据
  echo json_encode($result);
?>

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