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javascript基于DOM实现省市级联下拉框的方法

  作者：bea

本文实例讲述了javascript基于DOM实现省市级联下拉框的方法。分享给大家供大家参考。具体实现方法如下： <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>省市级联下拉框</title><script t

本文实例讲述了javascript基于DOM实现省市级联下拉框的方法。分享给大家供大家参考。具体实现方法如下：




<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>省市级联下拉框</title>

<script type="text/javascript">

var provs = { "江西省": ["南昌市", "景德镇", "九江", "鹰潭", "萍乡", "新馀", "赣州", "吉安", "宜春", "抚州", "上饶"],

  "福建省": ["福州", "厦门", "莆田", "三明", "泉州", "漳州", "南平", "龙岩", "宁德"],

  "河北省": ["石家庄", "邯郸", "邢台", "保定", "张家口", "承德", "廊坊", "唐山", "秦皇岛", "沧州", "衡水"]

};

function loadProv() {

  //加载省份数据

  var prov = document.getElementById("prov");

  for (var key in provs) {

    var provName = key;

    var optProv = document.createElement("option");

    optProv.value = provName;

    optProv.innerText = provName;

    prov.appendChild(optProv);

  }

}

function provChange() {

  var prov = document.getElementById("prov");

  var city = document.getElementById("city");

  var provName = prov.value;

  //如果没有选择省份，则把城市下拉框隐藏

  if (provName == "none") {

    city.style.display = "none";

    return;

  }

  else {

    city.style.display = "";

  }

  var citys = provs[provName];

  //city.options.length = 0;

  //用这种方法也可以清空原始列表

  //清空城市的原始数据

  for (var i = city.childNodes.length - 1; i >= 0; i--) {

    var child = city.childNodes[i];

    city.removeChild(child);

  }

  //添加新的城市数据

  for (var i = 0; i < citys.length; i++) {

    var optCity = document.createElement("option");

    optCity.value = citys[i];

    optCity.innerText = citys[i];

    city.appendChild(optCity);

  }

}

</script>

</head>

<body onload="loadProv()">

<select id="prov" onchange="provChange()">

<option value="none">请选择省</option>

</select>

<select id="city" style="display:none"></select>

</body>

</html>


希望本文所述对大家的javascript程序设计有所帮助。




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