下拉select选项多级联动实例。
cxselect插件使用方法：
1. 引入JS，
<script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="js/jquery.cxselect.min.js"></script>
2. JS项设置。Find more here：http://code.ciaoca.com/jquery/cxselect/
<script>$('#cnMap').cxSelect({
url: 'js/cityData.min.json',
//url: 'js/cityData.min.json',
selects: ['province', 'city', 'region'],
nodata: 'none'
});
$('#globalMap').cxSelect({
url: 'js/globalData.min.json',
selects: ['country', 'state', 'city', 'region'],
nodata: 'none'
});
</script>
实例源码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--
<link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
<link href="favicon.ico" rel="Bookmark" type="image/x-icon" />
-->
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<!-- HTML5 Shim 和 Respond.js 用于让 IE8 支持 HTML5元素和媒体查询 -->
<!-- 注意： 如果通过 file:// 引入 Respond.js 文件，则该文件无法起效果 -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
<![endif]-->
<title>UnionSelect</title>
<link href="http://apps.bdimg.com/libs/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" />
</head>
<body>
<h1 align="center">下拉联动</h1>
<div id="" class="container">
<form method="post" action="" class="form-horizontal" role="form">
<div class="form-group" id="cnMap">
<label for="firstname" class="col-sm-3 control-label">全国<small> (省、市、县三级；包括提交表单的验证。)</small></label>
<div class="col-sm-3">
<select name="province" class="province form-control" disabled="disabled" data-first-title="选择省份"></select>
</div>
<div class="col-sm-3">
<select name="city" class="city form-control" disabled="disabled"></select>
</div>
<div class="col-sm-3">
<select name="region" class="region form-control" disabled="disabled"></select>
</div>
</div>
<hr />
<div class="form-group" id="globalMap">
<label for="firstname" class="col-sm-4 control-label">全球<small> (国、省、市、县三级；未做表单验证。)</small></label>
<div class="col-sm-2">
<select name="country" class="country form-control" disabled="disabled" data-first-title="选择国家"></select>
</div>
<div class="col-sm-2">
<select name="state" class="state form-control" disabled="disabled"></select>
</div>
<div class="col-sm-2">
<select name="city" class="city form-control" disabled="disabled"></select>
</div>
<div class="col-sm-2">
<select name="region" class="region form-control" disabled="disabled"></select>
</div>
</div>
<!--
<h2>全国</h2>
<div id="cnMap">
<select name="province" class="province" disabled="disabled" data-first-title="选择省份"></select>
<select name="city" class="city" disabled="disabled"></select>
<select name="region" class="region" disabled="disabled"></select>
</div>
<h2>全球</h2>
<div id="globalMap">
<select name="country" class="country" disabled="disabled" data-first-title="选择国家"></select>
<select name="state" class="state" disabled="disabled"></select>
<select name="city" class="city" disabled="disabled"></select>
<select name="region" class="region" disabled="disabled"></select>
</div>
-->
<br />
<button id="subBut" type="submit" class="btn btn-default">提交</button>
</form>
<?php
if($_POST){
echo "<br /><pre>";
print_r($_POST);
}
?>
</div>
<script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="js/jquery.cxselect.min.js"></script>
<script>
$('#cnMap').cxSelect({
url: 'js/cityData.min.json',
//url: 'js/cityData.min.json',
selects: ['province', 'city', 'region'],
nodata: 'none'
});
$('#globalMap').cxSelect({
url: 'js/globalData.min.json',
selects: ['country', 'state', 'city', 'region'],
nodata: 'none'
});
//表单验证start
$("#subBut").click(function(){
if (!$("#cnMap .province").val() && !$("#cnMap .province").attr('disabled'))
{
alert('请选择省份 :)');
$("#cnMap .province").focus();
return false;
} else if (!$("#cnMap .city").val() && !$("#cnMap .city").attr('disabled')) {
alert('请选择市 :)');
$("#cnMap .city").focus();
return false;
} else if (!$("#cnMap .region").val() && !$("#cnMap .region").attr('disabled')) {
alert('请选择县区 :)');
$("#cnMap .region").focus();
return false;
} else {
return true;
}
});
//表单验证end
</script>
</body>
</html>
必须的JS文件：jquery.cxselect.js 或 jquery.cxselect.min.js(压缩版)
必须的JSON文件：cityData.min.json（全国的城市列表） 和 globalData.min.json（全世界的城市列表）
这些都可以从这里下载：https://github.com/ciaoca/cxSelect
如果大家还想深入学习，可以点击这里进行学习，再为大家附3个精彩的专题：
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