js 三级联动
2019-03-21 20:53
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一个非常low的一个三级联动
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <form action="" name="theform"> <select name="province" onchange="getCity()"> <option value = "0">请选择所在的省份</option> <option value="1">浙江省</option> <option value="2">山东省</option> <option value="3">广东省</option> <option value="4">甘肃省</option> </select> <select id="city" onchange="getQu()"> <option value = "0">请选择所在的城市</option> </select> <select name = "qu"> <option value = "0">请选择所在的县区</option> </select> </form> <script> //按照省份的下拉列表的顺序定义二维数组 将城市列表对应到省份下 var city=[ ["杭州市","温州市","宁波市","绍兴市"],//浙江省 ["济南市","青岛市","济宁市","潍坊市"],//山东省 ["广州市","潮阳","澄海","潮州"],//广东省 ["兰州市","白银","敦煌","定西"]//甘肃省 ]; //县区数组 var qu=[ [ ["杭州一区","杭州二区"], ["温州一区","温州二区"], ["宁波一区","宁波二区"], ["绍兴一区","绍兴二区"] ], [ ["济南一区","济南二区"], ["青岛一区","青岛二区"], ["济宁一区","济宁二区"], ["潍坊一区","潍坊二区"], ], [ ["广州一区","广州二区"], ["潮阳一区","潮阳二区"], ["澄海一区","澄海二区"], ["潮州一区","潮州二区"], ], [ ["兰州一区","兰州二区"], ["白银一区","白银二区"], ["敦煌一区","敦煌二区"], ["定西一区","定西二区"], ] ]; var getProvince = document.forms['theform'].province; var City = document.forms[0].city; var Qu = document.forms[0].qu; function getCity(){ // 初始化 Qu.length = 1; City.length = 1; // 获得 省份选择的项(索引值,0开始) var getSelectIndex = getProvince.selectedIndex; // 匹配选择省下面的 市区 var proCity = city[getSelectIndex-1]; // console.log( proCity) for( var i=0; i<proCity.length; i++){ City[i+1] = new Option(proCity[i],getSelectIndex) } } function getQu(){ var getSelectIndex = getProvince.selectedIndex; // 省 var getCitySelectedIndex = City.selectedIndex; // 市 console.log( getCitySelectedIndex ) var cityQu = qu[getSelectIndex - 1][ getCitySelectedIndex - 1]; console.log( cityQu ) for( var i=0; i<cityQu.length; i++){ Qu[i+1] = new Option(cityQu[0],getCitySelectedIndex) } } </script> </body> </html>
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