javascript DOM 省市级联下拉框

最新推荐文章于 2023-09-25 11:10:58 发布

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最新推荐文章于 2023-09-25 11:10:58 发布

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本文提供了一个HTML和JavaScript实现的省市级联下拉框示例，展示了如何动态加载并选择省级行政区，并根据选择的省份加载对应的城市级行政区。

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