php+mysql 采用ajax技术的省市地 3级联动无刷新菜单源码

php中文网

发布时间：2016-05-22 17:21:35

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来源于php中文网

原创

很简单的

  1.先把
加到 header.html 页
  2.把 regionss() 函数加到 /include/tag.php 里
  3.在你网站的根目录建立个  regions.php 文件
  4.在你的模板的适当的地方加入 {$regionss(中华人民共和国)} 即可

注意：  表单的名字可根据你的需要可以自己修改...

测试页代码：

php+ajax动态生成下拉菜单

regionss 函数代码：
//省市地3级联动下拉菜单函数 regionss 省.市.地
function regionss($country="中华人民共和国")
{
      global $db; $i = 1;
      $text="";
      $text.=" n";
      $text.="n";
      return $text;

}

regions.js 的代码：

//var ab = new Array();
var xmlHttp;
var xmlHttpa;
function createXMLHttpRequest() {
if (window.ActiveXObject) {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
      xmlHttp = new XMLHttpRequest();
}
}
function createXMLHttpRequesta() {
if (window.ActiveXObject) {
      xmlHttpa = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
      xmlHttpa = new XMLHttpRequest();
}
}

function startRequest() {
createXMLHttpRequest();
createXMLHttpRequesta();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttpa.onreadystatechange = handleStateChangearea;
document.getElementById('select2').options.length = 0;
document.getElementById('select3').options.length = 0;
var url = document.form1.select1.value;
var qurl = "/regions.php?province="+url+"&time="+new Date().getTime();
xmlHttp.open("GET", qurl, true);
xmlHttp.send(null);
//setTimeout("startRequest()",2000);
}

function handleStateChange() {
if(xmlHttp.readyState == 4) {
      if(xmlHttp.status == 200) {
      var obj = document.getElementById('select2'); //将服务器返回的字符串写到页面中ID为select2的区域
         obja = document.getElementById('select3'); //将服务器返回的字符串写到页面中ID为select3的区域
         eval(xmlHttp.responseText);

      }
}
}
function handleStateChangearea() {
         eval(xmlHttpa.responseText);
}
//var ab = new Array();

function startRequesta() {
createXMLHttpRequesta();
xmlHttpa.onreadystatechange = handleStateChangea;
document.getElementById('select3').options.length = 0;
var url = document.form1.select2.value;
var qurl = "/regions.php?city="+url+"&time="+new Date().getTime();
xmlHttpa.open("GET", qurl, true);
xmlHttpa.send(null);
//setTimeout("startRequest()",2000);
}

function handleStateChangea() {
if(xmlHttpa.readyState == 4) {
      if(xmlHttpa.status == 200) {
      var obja = document.getElementById('select3');
         eval(xmlHttpa.responseText);
      //将服务器返回的字符串写到页面中ID为select3的区域

      }
}
}

数据岛 regions.php 页面代码

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require "common.php";
$city = $city ? $city : "";
$area = $area ? $area : "";
if($province && $city==''){
  global $db; $i = 1;

  $result = $db->query("SELECT DISTINCT city FROM ".TABLE_CITY." WHERE province='$province' ORDER BY cityid");
  while($r = $db->fetch_array($result))
{
   $r[city]=iconv('gb2312','UTF-8',$r[city]);
echo "obj.options[obj.options.length] = new Option('".$r[city]."','".$r[city]."');n";
$i++;
}
  $resultarea = $db->query("SELECT DISTINCT city FROM ".TABLE_CITY." WHERE province='$province' ORDER BY cityid");
  $r = $db->fetch_array($resultarea);
  $city = $r[city];
  $resulta = $db->query("SELECT DISTINCT area FROM ".TABLE_CITY." WHERE city='$city' ORDER BY cityid");
while($ra = $db->fetch_array($resulta))
{
   $ra[area]=iconv('gb2312','UTF-8',$ra[area]);
echo "obja.options[obja.options.length] = new Option('".$ra[area]."','".$ra[area]."');n";
$i++;
}

}
if($city && $province==''){
global $db; $i = 1;

$result = $db->query("SELECT DISTINCT area FROM ".TABLE_CITY." WHERE city='$city' ORDER BY cityid");
while($r = $db->fetch_array($result))
{
   $r[area]=iconv('gb2312','UTF-8',$r[area]);
echo "obja.options[obja.options.length] = new Option('".$r[area]."','".$r[area]."');n";
$i++;
}
}
?>