javascript基于DOM實現省市級聯下拉框的方法

2024-05-06 16:20:12

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這篇文章主要介紹了javascript基于DOM實現省市級聯下拉框的方法,可實現選擇省份后出現對應城市下拉框選項的功能,非常具有實用價值,需要的朋友可以參考下

本文實例講述了javascript基于DOM實現省市級聯下拉框的方法。分享給大家供大家參考。具體實現方法如下：

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

<head>

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

<title>省市級聯下拉框</title>

<script type="text/javascript">

var provs = { "江西省": ["南昌市", "景德鎮", "九江", "鷹潭", "萍鄉", "新馀", "贛州", "吉安", "宜春", "撫州", "上饒"],

"福建省": ["福州", "廈門", "莆田", "三明", "泉州", "漳州", "南平", "龍巖", "寧德"],

"河北省": ["石家莊", "邯鄲", "邢臺", "保定", "張家口", "承德", "廊坊", "唐山", "秦皇島", "滄州", "衡水"]

};

function loadProv() {

//加載省份數據

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;

//如果沒有選擇省份，則把城市下拉框隱藏

if (provName == "none") {

city.style.display = "none";

return;

}

else {

city.style.display = "";

}

var citys = provs[provName];

//city.options.length = 0;

//用這種方法也可以清空原始列表

//清空城市的原始數據

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

var child = city.childNodes[i];

city.removeChild(child);

}

//添加新的城市數據

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">請選擇省</option>

</select>

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

</body>

</html>