PHP+AJAX无刷新实现返回天气预报数据
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2022-10-30 21:09:23
用php来写一个天气预报的模块 天气数据是通过采集中国气象网站的。本来中国天气网站也给出了数据的api接口。以下是api的地址。返回的数据格式为json格式。 1. htt...
用php来写一个天气预报的模块
天气数据是通过采集中国气象网站的。本来中国天气网站也给出了数据的api接口。以下是api的地址。返回的数据格式为json格式。
1. http://www.weather.com.cn/data/sk/101010100.html
2. http://www.weather.com.cn/data/cityinfo/101010100.html
3. http://m.weather.com.cn/data/101010100.html
url中的数字”101010100“是城市代码。所以可以先列出每个城市的城市代码，然后php程序接收到了城市代码，再去组装url，在通过url来显示该城市的实时天气。
index.php
<?php
header("content-type:text/html;charset=utf-8");
?>
<html>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<head>
<title>weather forecast</title>
<script type="text/javascript" src="ajax.js"></script>
<script type="text/javascript">
function $(id){
return document.getelementbyid(id);
}
function getcityid(){
var http_request=createajax();
var url="weatherforecast.php"
var data="cityid="+$("cityid").value;
http_request.onreadystatechange=getwetherinfo;
http_request.open("post",url,true);
http_request.setrequestheader("content-type","application/x-www-form-urlencoded");
http_request.send(data);
function getwetherinfo(){
if(http_request.readystate==4 && http_request.status==200){
var info=http_request.responsetext;
$("weatherinfo").innerhtml=info;
}
}
}
</script>
</head>
<body>
<select name="cityid" onchange="getcityid();" id="cityid">
<option>--请选择城市--</option>
<option value="101010100">北京</option>
<option value="101020100">上海</option>
<option value="101030100">天津</option>
<option value="101040100">重庆</option>
<option value="101280101">广州</option>
</select>
<span id="weatherinfo"></span>
</body>
</html>
weatherforecast.php
<?php
header("content-type:text/html;charset=utf-8");
header("cache-control:no-cache");
if (isset($_post['cityid'])){
$cityid=$_post['cityid'];
$url=$url="http://www.weather.com.cn/data/sk/".$cityid.".html";
}else {
$url="http://www.weather.com.cn/data/sk/101010100.html";
}
$weatherinfo_json=file_get_contents($url);
$weatherinfo=json_decode($weatherinfo_json,true);
$cityname=$weatherinfo['weatherinfo']['city'];
$citytemp=$weatherinfo['weatherinfo']['temp'];
$citywd=$weatherinfo['weatherinfo']['wd'];
$cityws=$weatherinfo['weatherinfo']['ws'];
$citytime=$weatherinfo['weatherinfo']['time'];
$citysd=$weatherinfo['weatherinfo']['sd'];
echo $weatherinfo="城市名字：$cityname,气温：$citytemp,风向：$citywd";
?>
天气数据是通过采集中国气象网站的。本来中国天气网站也给出了数据的api接口。以下是api的地址。返回的数据格式为json格式。
1. http://www.weather.com.cn/data/sk/101010100.html
2. http://www.weather.com.cn/data/cityinfo/101010100.html
3. http://m.weather.com.cn/data/101010100.html
url中的数字”101010100“是城市代码。所以可以先列出每个城市的城市代码，然后php程序接收到了城市代码，再去组装url，在通过url来显示该城市的实时天气。
index.php
复制代码 代码如下:
<?php
header("content-type:text/html;charset=utf-8");
?>
<html>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<head>
<title>weather forecast</title>
<script type="text/javascript" src="ajax.js"></script>
<script type="text/javascript">
function $(id){
return document.getelementbyid(id);
}
function getcityid(){
var http_request=createajax();
var url="weatherforecast.php"
var data="cityid="+$("cityid").value;
http_request.onreadystatechange=getwetherinfo;
http_request.open("post",url,true);
http_request.setrequestheader("content-type","application/x-www-form-urlencoded");
http_request.send(data);
function getwetherinfo(){
if(http_request.readystate==4 && http_request.status==200){
var info=http_request.responsetext;
$("weatherinfo").innerhtml=info;
}
}
}
</script>
</head>
<body>
<select name="cityid" onchange="getcityid();" id="cityid">
<option>--请选择城市--</option>
<option value="101010100">北京</option>
<option value="101020100">上海</option>
<option value="101030100">天津</option>
<option value="101040100">重庆</option>
<option value="101280101">广州</option>
</select>
<span id="weatherinfo"></span>
</body>
</html>
weatherforecast.php
复制代码 代码如下:
<?php
header("content-type:text/html;charset=utf-8");
header("cache-control:no-cache");
if (isset($_post['cityid'])){
$cityid=$_post['cityid'];
$url=$url="http://www.weather.com.cn/data/sk/".$cityid.".html";
}else {
$url="http://www.weather.com.cn/data/sk/101010100.html";
}
$weatherinfo_json=file_get_contents($url);
$weatherinfo=json_decode($weatherinfo_json,true);
$cityname=$weatherinfo['weatherinfo']['city'];
$citytemp=$weatherinfo['weatherinfo']['temp'];
$citywd=$weatherinfo['weatherinfo']['wd'];
$cityws=$weatherinfo['weatherinfo']['ws'];
$citytime=$weatherinfo['weatherinfo']['time'];
$citysd=$weatherinfo['weatherinfo']['sd'];
echo $weatherinfo="城市名字：$cityname,气温：$citytemp,风向：$citywd";
?>
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