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ajax省市區三級聯動

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ajax省市區三級聯動
area.html 

<!DOCTYPE HTML><html>    <head>        <title> ajax </title>        <meta charset="utf-8"/>        <script type="text/javascript">            var httpAjax = new XMLHttpRequest();            function $(id){                return document.getElementById(id);            }            // 擷取省            function getProvince(){                httpAjax.onreadystatechange=function(){                    if(httpAjax.readyState == 4 && httpAjax.status == 200){                        var res = httpAjax.responseText;                        res = eval("("+res+")");                        var _html = "<option value=\"\">請選擇...</option>";                        for(var i in res){                            _html += "<option value='"+res[i]['id']+"'>"+res[i]['name']+"</option>"                        }                        $("province").innerHTML = _html;                    }                }                httpAjax.open("post","area.php",false);                httpAjax.setRequestHeader("content-TYPE","application/x-www-form-urlencoded");                httpAjax.send("");            }            // 載入完畢  設定選擇省            window.onload=function(){                getProvince();            }            // 擷取市            function getCity(pid){                if(pid == ""){                    alert(1);                    $("city").innerHTML = "<option value=\"\">請選擇...</option>";                    $("county").innerHTML = "<option value=\"\">請選擇...</option>";                    return false;                }                $("county").innerHTML = "<option value=\"\">請選擇...</option>";                httpAjax.onreadystatechange=function(){                    if(httpAjax.readyState == 4 && httpAjax.status == 200){                        var res = httpAjax.responseText;                        res = eval("("+res+")");                        var _html = "<option value=\"\">請選擇...</option>";                        for(var i in res){                            _html += "<option value='"+res[i]['id']+"'>"+res[i]['name']+"</option>"                        }                        $("city").innerHTML = _html;                    }                }                httpAjax.open("post","area.php",false);                httpAjax.setRequestHeader("content-TYPE","application/x-www-form-urlencoded");                var data = "id="+pid;                httpAjax.send(data);            }            // 擷取區縣市            function getCounty(cid){                if(cid == ""){                    $("county").innerHTML = "<option value=\"\">請選擇...</option>";                    return false;                }                httpAjax.onreadystatechange=function(){                    if(httpAjax.readyState == 4 && httpAjax.status == 200){                        var res = httpAjax.responseText;                        res = eval("("+res+")");                        var _html = "<option value=\"\">請選擇...</option>";                        for(var i in res){                            _html += "<option value='"+res[i]['id']+"'>"+res[i]['name']+"</option>"                        }                        $("county").innerHTML = _html;                    }                }                httpAjax.open("post","area.php",false);                httpAjax.setRequestHeader("content-TYPE","application/x-www-form-urlencoded");                var data = "id="+cid;                httpAjax.send(data);            }        </script>    </head>    <body style="padding:200px;">            <select id="province" onchange="getCity(this.value)">                <option value="">請選擇...</option>            </select>省            <select id="city" onchange="getCounty(this.value)">                <option value="">請選擇...</option>            </select>市            <select id="county">                <option value="">請選擇...</option>            </select>縣/市/區             </body></html>

 

  area.php  
<?php    $pdo = new PDO("mysql:host=localhost;dbname=tk106","root","admin");    $pdo->exec("set names utf8");    $id = isset($_REQUEST['id']) ? $_REQUEST['id'] : "0";    $sql = "select * from area where parentid=".$id;    $data = $pdo->query($sql)->fetchAll(PDO::FETCH_ASSOC);    echo json_encode($data);?>

 

  

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