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                ## :-: thinkphp5+ajax三級聯動下拉菜單 html代碼: ``` <div id="sanji"></div> ``` js代碼: ``` $(document).ready(function(e) { var str = "<select id='sheng'></select><select id='shi'></select><select id='qu'></select>";//三個下拉交給一個字符串 $("#sanji").html(str);//將三個下拉的字符串交給前邊的div tiansheng();//加載省的數據 tianshi();//加載市的數據 tianqu();//加載區 的數據 $("#sheng").change(function(){ tianshi();//重新加載市 tianqu();//重新加載區 }) $("#shi").change(function(){ tianqu();//加載區的數據 }) }); function tiansheng() { var pcode = "1"; //找出省的父級代號 $.ajax({ async:false,//同步 url:"http://www.tp5.com/region/", data:{pcode:pcode}, type:"GET", dataType:"JSON", success: function(data){ var str = ""; for(var i=0;i<data.length;i++) { var lie = data[i].REGION_NAME;//拆分列 var val = data[i].REGION_ID; str += "<option value='"+val+"'>"+lie+"</option>"; } $("#sheng").html(str); } }); } function tianshi() { var pcode = $("#sheng").val();//找市的父級代號,省選中項的值 $.ajax({ async:false, url:"http://www.tp5.com/region/", data:{pcode:pcode}, type:"GET", dataType:"JSON", success: function(data){ var str = ""; for(var i=0;i<data.length;i++) { var lie = data[i].REGION_NAME;//拆分列 var val = data[i].REGION_ID; str += "<option value='"+val+"'>"+lie+"</option>"; } $("#shi").html(str); } }); } function tianqu() { var pcode = $("#shi").val();//找區的父級代號,市選中項的值 $.ajax({ url:"http://www.tp5.com/region/", data:{pcode:pcode}, type:"GET", dataType:"JSON", success: function(data){ var str = ""; for(var i=0;i<data.length;i++) { var lie = data[i].REGION_NAME;//拆分列 var val = data[i].REGION_ID; str += "<option value='"+val+"'>"+lie+"</option>"; } $("#qu").html(str); } }); } ``` tp5方法: ``` public function getRegionAll() { $id = $_GET['pcode']; header("Access-Control-Allow-Origin: *"); $regions = RegionModel::all(['PARENT_ID'=>$id]); return json($regions, 200); } ``` sql文件: [鏈接](https://pan.baidu.com/s/1hBUvb8xYRSarKw-5F6XhrA)密碼ltdu
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