本文实例讲述了js实现简单的省市县三级联动效果。分享给大家供大家参考,具体如下:
js代码部分
//省市县数据格式 var province_city_county_data=[ { province:"四川", city:[ { cityName:"成都", county:["成都市","崇州市","金堂县"] }, { cityName:"南充", county:["仪陇县","南部县","营山县"] } ] }, { province:"北京", city:[ { cityName:"北京市", county:["东城区","朝阳区"] } ] }, { province:"安徽", city:[ { cityName:"安庆", county:["安庆市","怀宁县","潜山县"] }, { cityName:"蚌埠", county:["蚌埠市","固镇县","怀远县"] } ] } ] var opt0 = ["省份","地级市","市、县级市、县"]; var selectID_arr2=["provinceid","cityid","countyid"]; var province_index; window.onload = function(){ //初始化下拉框 function init_select(){ init_title(); init_province(); bind_province(); } //初始化提示标题 function init_title(){ for(var k = 0;k<selectID_arr2.length;k++){ var select_obj= document.getElementById(selectID_arr2[k]); select_obj.options[0]=new Option(opt0[k],opt0[k]); } } //初始化省份 function init_province(){ var province_select_obj = document.getElementById(selectID_arr2[0]); var province_len = province_city_county_data.length; for(var i = 0;i<province_len;i++){ province_select_obj.options[i+1] = new Option(province_city_county_data[i].province,province_city_county_data[i].province); } } //给省份绑定onchange事件 function bind_province(){ var province_select_obj = document.getElementById(selectID_arr2[0]); province_select_obj.onchange=function(){ var opt_index =province_select_obj.selectedIndex; if(opt_index!=0){ province_index = opt_index-1; //每个省份的序号比 option 的下标要小1 init_city(province_index); bind_city(); init_county(province_index,0); }else{ clear_city(); clear_county(); } } } //选择一个省份才能初始化地级市 function init_city(index){ clear_city(); var city_len = province_city_county_data[index].city.length; for(var i = 0;i<city_len;i++){ document.getElementById(selectID_arr2[1]).options[i+1] = new Option(province_city_county_data[index].city[i].cityName,province_city_county_data[index].city[i].cityName); } document.getElementById(selectID_arr2[1]).options[1].selected = true; } //清除地级市信息 function clear_city(){ var city_select_obj = document.getElementById(selectID_arr2[1]); city_select_obj.options.length=0; //每次选中一个新的省份 都重新删除地级市的信息 init_title(); //重新初始化标题 } //给地级市绑定onchange事件 function bind_city(){ var city_select_obj = document.getElementById(selectID_arr2[1]); city_select_obj.onchange=function(){ var opt_index =city_select_obj.selectedIndex; if(opt_index!=0){ init_county(province_index,opt_index-1); }else{ clear_county(); } } } //选择一个地级市后才能初始化县 function init_county(index,city_index){ clear_county(); var county_len = province_city_county_data[index].city[city_index].county.length; for(var i = 0;i<county_len;i++){ document.getElementById(selectID_arr2[2]).options[i+1] = new Option(province_city_county_data[index].city[city_index].county[i],province_city_county_data[index].city[city_index].county[i]); } document.getElementById(selectID_arr2[2]).options[1].selected = true; } //清除县城信息 function clear_county(){ var county_select_obj = document.getElementById(selectID_arr2[2]); county_select_obj.options.length=0; //每次选中一个新的地级市 都重新删除县的信息 init_title(); //重新初始化标题 } init_select() }
html部分
<select id="provinceid"></select> <select id="cityid"></select> <select id="countyid"></select>
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希望本文所述对大家JavaScript程序设计有所帮助。