AJAX实例:根据邮编自动完成地址信息

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描述: 
 

在注册或购物车结帐的时候,需要用户填入个人资料,这个环节可以简练一下,我们只需客人填入邮政编码,然后就根据这个邮政编码,自动从数据库中取出相应的省,市等地址信息。这样既可以减少客户的输入,增加客户体验,又可以减少由于资料输入而产生的错误。 
 

实现: 
 

 

HTML
<script>
function createRequestObject() {
var ro;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
ro = new ActiveXObject("Microsoft.XMLHTTP");
}else{
ro = new XMLHttpRequest();
}
return ro;
}
var http = createRequestObject();
function sndReq(zip) {
http.open('get', 'zipcode.php?zip='+zip);
http.onreadystatechange = handleResponse;
http.send(null);
}function handleResponse() {
if(http.readyState == 4){
var response = http.responseText;
var update = new Array();
if(response.indexOf('|' != -1)) {
update = response.split('|');
document.getElementById("city").value = update[0];
document.getElementById("state").value = update[1];
}
}
}
</script>
<h3>Enter A United States Zipcode, Then Tab</h3>
<table align="center">
<tr>
<td>Enter Zipcode:</td>
<td><input type="text" id="zipcode" name="zipcode" onBlur="sndReq(this.value);"/></td>
</tr>
<tr>
<td>City:</td>
<td><input type="text" id="city" name="city"/></td>
</tr>
<tr>
<td>State:</td>
<td><input type="text" id="state" name="state"/></td>
</tr>
</table>以上是客户输入页面,下面是服务端的处理页面'zipcode.php 
 

$dbuser = 'root';
$dbpass = '111111';
$cn = mysql_connect("localhost", $dbuser, $dbpass);
$db = mysql_select_db("ajax");
$sql = "select city, state from zipcodes where zipcode = " . 
___FCKpd___0
REQUEST['zip']; $rs = mysql_query($sql); $row = mysql_fetch_array($rs); echo $row['city'] . "|" . $row['state']; mysql_close($cn); ?>当客户输入一个POSTCODE后,zipcode.php就接收到它,然后进行从数据表中取出对应的资料,再按一定的格式返回给客户端(此处是以 | 分隔)。最后客户端接收返回的资料,显示在页面上。 if(response.indexOf('|' != -1)) { update = response.split('|'); document.getElementById("city").value = update[0]; document.getElementById("state").value = update[1]; }

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