JavaScript实现省市级联效果实例

时间：2022-02-04 04:22:27
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

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

<title>省市级联效果</title>

<script type="text/javascript">

    function selectCity(){

        var objProvince=document.getElementById("province");

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

        //objCity.length=0; //清空下拉列表选项

        objCity.options.length=0;

        switch(objProvince.value){

                case "1":

                    objCity.add(new Option("南京","1"),null);

                    objCity.add(new Option("苏州","2"),null);

                    objCity.add(new Option("无锡","3"),null);

                    objCity.add(new Option("南通","4"),null);

                    break;

                case "2":

                    objCity.add(new Option("济南","1"),null);

                    objCity.add(new Option("青岛","2"),null);

                    objCity.add(new Option("日照","3"),null);

                    objCity.add(new Option("烟台","4"),null);

                    break;

                case "3":

                    objCity.add(new Option("广州","1"),null);

                    objCity.add(new Option("东莞","2"),null);

                    objCity.add(new Option("深圳","3"),null);

                    objCity.add(new Option("佛山","4"),null);

                    break;

        }

    }

</script>

</head>

<body>

    <form action="" method="post">

        <select id="province" onchange="selectCity();">

            <option value="0">--省份--</option>

            <option value="1">江苏省</option>

            <option value="2">山东省</option>

            <option value="3">广东省</option>

            <option value="4">浙江省</option>

            <option value="5">云南省</option>

        </select>

        <select id="city">

            <option value="0">--城市--</option>

        </select>

    </form>

</body>

</html>

数组-省市级联

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

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

<title>数组-省市级联</title>

<script type="text/javascript">

    //定义省份城市数组

    var provinces=new Array();

    provinces["江苏省"]=["南京市","苏州市","徐州市","宿迁市"];

    provinces["山东省"]=["济南市","日照市","烟台市","青岛市"];

    provinces["浙江省"]=["杭州市","宁波市","义务市","温州市"];

    provinces["广东省"]=["广州市","佛山市","东莞市","珠海市"];

    //初始化省份信息

    function init(){

    var objProvince=document.getElementById("province");

    for(var p in provinces){

        objProvince.add(new Option(p,p),null);

        }

    }

    //切换城市

    function changeCity(){

        var objProvince=document.getElementById("province");

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

        objCity.length=0;

        //方式一：

/*          for(var p in provinces){

                if(p==objProvince.value){

                    for(var c in provinces[p]){

                        objCity.add(new Option(provinces[p][c],provinces[p][c]),null);

                    }

                }

            }   */

        //方式二：

            for(var p in provinces[objProvince.value]){

                objCity.add(new Option(provinces[objProvince.value][p],provinces[objCity.value]),null);

            }

    }

            window.onload=init;

</script>

</head>

<body>

    <form action="" method="post">

        <select id="province" onchange="changeCity();">

            <option value="0">--省份--</option>

        </select>

        <select id="city">

            <option value="0">--城市--</option>

        </select>

    </form>

</body>

</html>

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