javascript基于DOM实现省市级联下拉框的方法

2015-05-14 11:15作者：zhao

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：

<head>

<title>省市级联下拉框</title>

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>

</select>

</body>

</html>

希望本文所述对大家的javascript程序设计有所帮助。