这篇文章主要介绍了JavaScript实现的级联算法,结合省市二级联动下拉菜单功能实例分析了javascript事件响应与元素动态操作实现级联算法的相关技巧,需要的朋友可以参考下
本文实例讲述了JavaScript实现的级联算法。分享给大家供大家参考，具体如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>LinkDemo</title> <script src="https://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script> </script> <script type="text/javascript"> var shengshiString = "1_山东省-11_德州市+12_青岛市+13_济南市~2_河北省-21_邯郸市*211_临漳县/212_磁县+22_石家庄市*221_定县/222_宁县+23_保定市"; $(document).ready(function(){ init(); }); function init(){ var shengArray = shengshiString.split("~"); for (var i = 0; i < shengArray.length; i++) { var sheng = shengArray[i].split("-")[0]; var shi = shengArray[i].split("-")[1]; var shengid = sheng.split("_")[0]; var shengName = sheng.split("_")[1]; var Newoption = $("<option></option>"); $(Newoption).val(shengid); $(Newoption).text(shengName); $("#sheng").append(Newoption); if (i == 0) { shengchange(shengid); } } } function shengchange(shengidparam){ $("#shi").empty(); var shengArray = shengshiString.split("~"); for (var i = 0; i < shengArray.length; i++) { var shengString = shengArray[i].split("-")[0]; var shiString = shengArray[i].split("-")[1]; var shengId = shengString.split("_")[0]; if (shengidparam == shengId) { var shiArray = shiString.split("+"); for (var j = 0; j < shiArray.length; j++) { var shistring = shiArray[j].split("*")[0]; var shi = shistring; var shiId = shi.split("_")[0]; var shiName = shi.split("_")[1]; var Newoption = $("<option></option>"); $(Newoption).val(shiId); $(Newoption).text(shiName); $("#shi").append(Newoption); if (shiName == "邯郸市" || shiName == "石家庄市") { shichange(shiId); } } } } } function shichange(shiidparam){ $("#xian").empty(); var shengArray = shengshiString.split("~"); for (var i = 0; i < shengArray.length; i++) { var shengString = shengArray[i].split("-")[0]; var shiString = shengArray[i].split("-")[1]; var shengId = shengString.split("_")[0]; var shiArray = shiString.split("+"); for (var j = 0; j < shiArray.length; j++) { var shistring = shiArray[j].split("*")[0]; var xianarray = shiArray[j].split("*")[1]; var shi = shistring; var shiId = shi.split("_")[0]; var shiName = shi.split("_")[1]; if (shiId == shiidparam) { var xian = xianarray.split("https://www.jb51.net/"); for (var s = 0; s < xian.length; s++) { var xianId = xian[s].split("_")[0]; var xianName = xian[s].split("_")[1]; var Newoption = $("<option></option>"); $(Newoption).val(xianId); $(Newoption).text(xianName); $("#xian").append(Newoption); } } } } } </script> </head> <body> <select onchange="shengchange(this.value)"> </select> <select onchange="shichange(this.value)"> </select> <select> </select> </body> </html>
使用在线HTML/CSS/JavaScript代码运行工具：测试上述代码，运行效果如下图所示：
更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript操作DOM技巧总结》、《JavaScript数组操作技巧总结》、《JavaScript排序算法总结》、《JavaScript遍历算法与技巧总结》、《JavaScript数学运算用法总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript查找算法技巧总结》及《JavaScript错误与调试技巧总结》
希望本文所述对大家JavaScript程序设计有所帮助。
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