This article mainly introduces the simple province, city and county three-level linkage function implemented by native JavaScript. It analyzes the implementation method of javascript linkage menu in the form of a complete example, involving javascript event response and dynamic operation of page elements related implementation techniques. Required Friends can refer to
. The example in this article describes the simple province, city and county three-level linkage function implemented in native JavaScript. Share it with everyone for your reference. The details are as follows:
Three-level linkage is indispensable when we write forms. For example, we use it when writing the delivery address. I have been looking at native JavaScript recently. Let’s start with the basics and wait for improvement. Later, we will write a jquery version of
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>三级联动菜单</title> <style> select { font-family: "萝莉体 第二版"; } .hide { display: none; } </style> </head> <body> <p> <select id="province"> <option>-请选择-</option> </select> <select id="city" class="hide"> <option>-请选择-</option> </select> <select id="area" class="hide"> <option>-请选择-</option> </select> </p> <script> var provinceList = ['北京市', '河北省', '浙江省']; var cityList = [['东城区', '西城区', '海淀区'], ['廊坊市', '唐山市', '石家庄市', '承德市'], ['杭州市', '温州市', '宁波市', '嘉兴市', '绍兴市']]; var areasList = [ [ ['东城区1', '东城区2', '东城区3'], ['西城区1', '西城区2', '西城区3'], ['海淀区1', '海淀区2', '海淀区3'] ], [ ['廊坊市1', '廊坊市2', '廊坊市3', '廊坊市4'], ['唐山市1', '唐山市2', '唐山市3', '唐山市4'], ['石家庄市1', '石家庄市2', '石家庄市3', '石家庄市4'], ['承德市1', '承德市2', '承德市3', '承德市4'] ], [ ['杭州市1', '杭州市2', '杭州市3', '杭州市4', '杭州市5'], ['温州市1', '温州市2', '温州市3', '温州市4', '温州市5'], ['宁波市1', '宁波市2', '宁波市3', '宁波市4', '宁波市5'], ['嘉兴市1', '嘉兴市2', '嘉兴市3', '嘉兴市4', '嘉兴市5'], ['绍兴市1', '绍兴市2', '绍兴市3', '绍兴市4', '绍兴市5'] ] ]; //1.获取元素 var province = document.getElementById("province"); var city = document.getElementById("city"); var area = document.getElementById("area"); //2.给省的选择框赋值, // ----使用自执行函数,避免污染全局变量----- (function () { for (var i = 0; i < provinceList.length; i++) { var myOption = document.createElement("option"); myOption.innerHTML = provinceList[i]; //设置value值 myOption.value = i; province.appendChild(myOption); } })(); //3.设置选择省的行为函数 province.onchange = function (e) { city.style.display = "inline-block"; //设置第二个出现 while (city.children.length > 1) { //当省设置为“请选择”时,移除子元素 city.removeChild(city.lastElementChild); } while (area.children.length > 1) { //当市设置为“请选择”时,移除子元素 area.removeChild(area.lastElementChild); } if (cityList[this.value]) {//当设置为请选择时不显示列表 for (var i = 0; i < cityList[this.value].length; i++) { //添加市的列表 var myOption = document.createElement("option"); myOption.innerHTML = cityList[this.value][i]; //设置value值 myOption.value = i; city.appendChild(myOption); } } }; //4.设置选择市的行为函数 city.onchange = function (e) { area.style.display = "inline-block"; //设置第二个出现 while (area.children.length > 1) { //当市设置为“请选择”时,移除子元素 area.removeChild(area.lastElementChild); } if (areasList[province.value][this.value]) {//当设置为"请选择"时不显示列表 for (var i = 0; i < areasList[province.value][this.value].length; i++) { //添加市的列表 var myOption = document.createElement("option"); myOption.innerHTML = areasList[province.value][this.value][i]; area.appendChild(myOption); } } } </script> </body> </html>
. The running effect is as follows:
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