三级城市联动菜单

<select name="provinceid" id="provinceid" onchange="change_city($(this))" data-target="cityid">
    <option>请选择全国省份</option>
</select>

<select name="cityid" id="cityid" onchange="change_city($(this))" data-target="three_cityid">
    <option>...</option>
</select>

<select name="three_cityid" id="three_cityid">
    <option>...</option>
</select>

function change_city($this){
    var nextObjectId = $this.attr(‘data-target‘);
    if (nextObjectId != undefined){
        $.get(ajaxUrl,{id:$this.val()},function(data){
            $("#"+nextObjectId).html(data);
            change_city($("#"+nextObjectId));
        });
    }
}