省市区（县）三级联动
偶遇大神三级联动，顿觉新颖，借鉴之。
展示图
html
<style>
.box{width:80%; margin:20px auto}
.box p{line-height:24px}
</style>
<body>
<div class="box">
<p>三级联动</p>
<p>没有数据的select不显示</p>
<div id="con">
<select class="prov"></select>
<select class="city" disabled="disabled"></select>
<select class="dist" disabled="disabled"></select>
</div>
</div>
</div>
</body>
</html>
<script src="jquery-1.8.1.min.js"></script>
<script src="city.js"></script>
<script>
$(function(){
$("#con").citySelect({
prov:"北京",
nodata:"none"
});
})
</script>
city.js
1 /*------------------------------- 2 Ajax 三级省市联动 3 settings 参数说明 4 ----- 5 data:省市数据 6 prov:默认省份 7 city:默认城市 8 dist:默认地区（县） 9 nodata:无数据状态 10 required:必选项 11 ------------------------------ */ 12 var pro_city_data = 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13 14 (function($){ 15 $.fn.citySelect=function(settings){ 16 if(this.length<1){return;}; 17 18 // 默认值 19 settings=$.extend({ 20 data:pro_city_data, 21 prov:null, 22 city:null, 23 dist:null, 24 nodata:null, 25 required:true 26 },settings); 27 28 var box_obj=this; 29 var prov_obj=box_obj.find(".prov"); 30 var city_obj=box_obj.find(".city"); 31 var dist_obj=box_obj.find(".dist"); 32 var prov_val=settings.prov; 33 var city_val=settings.city; 34 var dist_val=settings.dist; 35 var select_prehtml=(settings.required) ? "" : "<option value=''>请选择</option>"; 36 var city_json; 37 38 // 赋值市级函数 39 var cityStart=function(){ 40 var prov_id=prov_obj.get(0).selectedIndex; 41 if(!settings.required){ 42 prov_id--; 43 }; 44 city_obj.empty().attr("disabled",true); 45 dist_obj.empty().attr("disabled",true); 46 47 if(prov_id<0||typeof(city_json.citylist[prov_id].c)=="undefined"){ 48 if(settings.nodata=="none"){ 49 city_obj.css("display","none"); 50 dist_obj.css("display","none"); 51 }else if(settings.nodata=="hidden"){ 52 city_obj.css("visibility","hidden"); 53 dist_obj.css("visibility","hidden"); 54 }; 55 return; 56 }; 57 58 // 遍历赋值市级下拉列表 59 temp_html=select_prehtml; 60 $.each(city_json.citylist[prov_id].c,function(i,city){ 61 temp_html+="<option value='"+city.n+"'>"+city.n+"</option>"; 62 }); 63 city_obj.html(temp_html).attr("disabled",false).css({"display":"","visibility":""}); 64 distStart(); 65 }; 66 67 // 赋值地区（县）函数 68 var distStart=function(){ 69 var prov_id=prov_obj.get(0).selectedIndex; 70 var city_id=city_obj.get(0).selectedIndex; 71 if(!settings.required){ 72 prov_id--; 73 city_id--; 74 }; 75 dist_obj.empty().attr("disabled",true); 76 77 if(prov_id<0||city_id<0||typeof(city_json.citylist[prov_id].c[city_id].a)=="undefined"){ 78 if(settings.nodata=="none"){ 79 dist_obj.css("display","none"); 80 }else if(settings.nodata=="hidden"){ 81 dist_obj.css("visibility","hidden"); 82 }; 83 return; 84 }; 85 86 // 遍历赋值市级下拉列表 87 temp_html=select_prehtml; 88 $.each(city_json.citylist[prov_id].c[city_id].a,function(i,dist){ 89 temp_html+="<option value='"+dist.s+"'>"+dist.s+"</option>"; 90 }); 91 dist_obj.html(temp_html).attr("disabled",false).css({"display":"","visibility":""}); 92 }; 93 94 var init=function(){ 95 // 遍历赋值省份下拉列表 96 temp_html=select_prehtml; 97 $.each(city_json.citylist,function(i,prov){ 98 temp_html+="<option value='"+prov.p+"'>"+prov.p+"</option>"; 99 }); 100 prov_obj.html(temp_html); 101 102 // 若有传入省份与市级的值，则选中。（setTimeout为兼容IE6而设置） 103 setTimeout(function(){ 104 if(settings.prov!=null){ 105 prov_obj.val(settings.prov); 106 cityStart(); 107 setTimeout(function(){ 108 if(settings.city!=null){ 109 city_obj.val(settings.city); 110 distStart(); 111 setTimeout(function(){ 112 if(settings.dist!=null){ 113 dist_obj.val(settings.dist); 114 }; 115 },1); 116 }; 117 },1); 118 }; 119 },1); 120 121 // 选择省份时发生事件 122 prov_obj.bind("change",function(){ 123 cityStart(); 124 }); 125 126 // 选择市级时发生事件 127 city_obj.bind("change",function(){ 128 distStart(); 129 }); 130 }; 131 132 // 设置省市json数据 133 city_json=settings.data; 134 init(); 135 }; 136 })(jQuery);
感谢。
