<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link href="public/bootstrap.css" rel="stylesheet">
<link rel="icon" href=public/siyecao.png>
<script src="public/jquery-1.12.4.js" type="text/javascript"></script>
<script src="public/bootstrap.js" type="text/javascript"></script>
<title>JQUERY</title>
<script type="text/javascript">
var option = [{'id':'1','areaname':'北京','children':[{'id':'1.1','areaname':'东城区','children':[{'id':'1.1.1','areaname':'东城区1','children':[{'id':'1.1.1.1','areaname':'东城区2'}]}]}]},
{'id':'2','areaname':'天津','children':[{'id':'2.1','areaname':'河东区','children':[{'id':'2.1.1','areaname':'河东区1'}]}]},
{'id':'3','areaname':'河北','children':[{'id':'3.1','areaname':'宁河县','children':[{'id':'3.1.1','areaname':'宁河县1'}]}]},
{'id':'4','areaname':'山西','children':[{'id':'4.1','areaname':'太原市','children':[{'id':'4.1.1','areaname':'太原市1'}]}]},
{'id':'5','areaname':'辽宁','children':[{'id':'5.1','areaname':'沈阳市','children':[{'id':'5.1.1','areaname':'沈阳市1'}]}]},
{'id':'6','areaname':'辽陆','children':[{'id':'6.1','areaname':'辽陆1','children':[{'id':'6.1.1','areaname':'辽陆11'}]},{'id':'6.2','areaname':'辽陆2','children':[{'id':'6.2.1','areaname':'辽陆22'}]}]},
];
$(document).ready(function(){
clickSelect(option);
//给定json文档，以children为键写子层次的下拉类容,name取名si[],clss取名s[],给定json文件自动生成多下拉菜单
//____________________________________________________________________________________________________
function clickSelect(c){ //|
select1 = $('select[name="s1[]"]'); //|
$.each(c,function(k,v){ //|
select1.append('<option value='+v.id+'>'+v.areaname); //|
}); //|
kkk(c); //|
select1.parent().on('change','select[class="s[]"]',function(){ //|
kkk(c,$(this)); //|
}); //|
}; //|
function kkk(c,s=select1){ //|
$(s).nextAll().remove(); //|
var id = s.val(); //|
var name = s.prop('name');var start = name.indexOf('s')+1;var stop = name.indexOf('['); //|
var nameid = parseInt(name.substring(start,stop)); //|
var rankid = id.split('.'); //|
$.each(rankid,function(K1,v1){ //|
if(K1==0) kareak = c; //|
$.each(kareak,function(k,v){ //|
if(v.id.split('.')[v.id.split('.').length-1]==v1){ //|
kareak = v.children; //|
if(rankid.length-1==K1){ //|
var a = v; //|
for(var ilv=0;ilv<=1000;ilv++){ //|
if(a.children){ var a = a.children[0];} //|
else break; //|
}; //|
for(var i=nameid+1;i<=ilv+nameid;i++){ //|
var m = "$('select[name="s"+i+"[]"]')"; //|
eval('select'+(i-1)).after('<select class="s[]" name="s'+i+'[]">'); //|
eval('select'+i+'='+m); //|
}; //|
for(var j=nameid+1;j<=ilv+nameid;j++){ //|
var s1 = 'select'+(j-1);var s2 = 'select'+j; //|
lll(c,eval(s1),eval(s2)); //|
}; //|
}; //|
}; //|
}); //|
}); //|
}; //|
function lll(c,a=select1,b=select2){ //|
b.empty(); //|
var id = a.val(); //|
var rankid = id.split('.'); //|
var rank = id.split('.').length-1; //|
$.each(rankid,function(k1,v1){ //|
if(k1==0) lareal = c; //|
$.each(lareal,function(k,v){ //|
if(v.id.split('.')[v.id.split('.').length-1]==v1){ //|
lareal = v.children; //|
if(rankid.length-1==k1){ //|
$.each(lareal,function(k,v){ //|
b.append('<option value='+v.id+'>'+v.areaname); //|
}); //|
}; //|
return false; //|
}; //|
}); //|
}); //|
} //|
//__________________________________________________________________________________________________//|
});
</script>
</head>
<body>
<div><select class="s[]" name="s1[]"></select></div>
</body>
</html>