How html interacts with php data-PHP Problem-php.cn

How html interacts with php data

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Release： 2023-02-27 22:52:01

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How html interacts with php data

Data interaction between php files and HTML pages

HTML sending (sent using POST)

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>

<body>
    <div class=&#39;search-choose&#39; id=&#39;search_choose&#39;>
        <ul> 
            <li id=&#39;search_1&#39; class=&#39;search-selected&#39;><a href=&#39;#&#39;>dog</a></li>
            <li id=&#39;search_2&#39;><a href=&#39;#&#39;>cat</a></li>
        </ul>
    </div>
    
    <script type=&#39;text/javascript&#39;>
    　　searchArray = document.getElementsByTagName(&#39;li&#39;);//获取名字为’li’的所有标签项并存入数组
    　　var writeArray = [];
    　　for(var i = 0;i<searchArray.length;i++){
       　　 writeArray[i] = searchArray[i].innerText;//获取标签内容writeArray = [&#39;dog&#39;,&#39;cat&#39;];
    　　}
    
    　　//使用POST将数组writeArray发送到php文件servertest.php
    　　var request = new XMLHttpRequest();
    　　request.open("POST", "servertest.php");
   　　 var q = "data=" + writeArray;//  q="name"+ value；
    　　//发送内容体由name+value组成，此处name为data，value为writeArray
    　　request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
   　　 request.send(q);
   　　 request.onreadystatechange = function() {
        　　if (request.readyState===4) {
        　　if (request.status===200) { 
        　　} else {
               　　 alert("发生错误：" + request.status);
            　　}
        　　} 
   　　 }
    </script>
</body>
</html>

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Note: Key operations

var request = new XMLHttpRequest();
request.open("POST", "servertest.php");
var q = "data=" + writeArray;// 生成信息体q = “name “+ value
request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
request.send(q);
//HTML页面POST发送内容后，php通过超全局变量 $_GET 和 $_POST收集

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php receives (collected using super-global variables $_GET and $_POST)

<?php
//设置页面内容是html编码格式是utf-8
header("Content-Type: text/plain;charset=utf-8"); 
//判断如果是get请求，则执行getMethod();；如果是POST请求，则执行postMethod()。
//$_SERVER是一个超全局变量，在一个脚本的全部作用域中都可用，不用使用global关键字
if ($_SERVER["REQUEST_METHOD"] == "GET") {
    getMethod();
} elseif ($_SERVER["REQUEST_METHOD"] == "POST"){
    postMethod();
}
function searchShow(){    
}
function postMethod(){
    $filename = &#39;save.txt&#39;;
//使用超全局变量 $_GET 和 $_POST收集name对应的value，如下
    $searchWrite = $_POST["data"]；
//将获取的HTML返回内容$searchWrite写入文档save.txt
    file_put_contents($filename, $searchWrite);
    $content = file_get_contents($filename);
    echo $content;
}

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Note: Key operations

searchWrite=searchWrite=_POST["data"]；

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Use super-global variables $ _POST collects the value corresponding to the name and puts it into $searchWrite, so the data sent by the HTML page is obtained, which can be used

HTML page to obtain the php variables through json

php Send (return data pairs in json format through echo)

<?php
header(&#39;Access-Control-Allow-Origin:*&#39;);
header(&#39;Access-Control-Allow-Methods:POST,GET&#39;);
header(&#39;Access-Control-Allow-Credentials:true&#39;); 
header("Content-Type: application/json;charset=utf-8"); 
if ($_SERVER["REQUEST_METHOD"] == "GET") {
    getMethod();
} elseif ($_SERVER["REQUEST_METHOD"] == "POST"){
    postMethod();
}
function getMethod(){    
    $filename = &#39;search_save.txt&#39;;//假设文件内容为dog，cat，pig,人
    if (file_exists($filename)) {
        $content = file_get_contents($filename);
        $pattern = &#39;/[\x{4e00}-\x{9fa5}_a-zA-Z0-9]+/u&#39;;
        //[\x{4e00}-\x{9fa5}_a-zA-Z0-9]匹配中文、下划线、字母、数字
        preg_match_all($pattern, $content, $matches);
        $searchRead = $matches[0];//通过正则表达式提取存储列表到$searchRead数组[&#39;dog&#39;,&#39;cat&#39;,&#39;pig&#39;,&#39;人&#39;]
        $defaultSearch = $searchRead[0];
        $result = &#39;{"success":false,"defaultSearch":""}&#39;;
        if($_GET["data"]){
            $result = &#39;{"success":true,"defaultSearch":"&#39;.$defaultSearch.&#39;"}&#39;;
        }
    }
    echo $result;//echo返回json格式化数据对{"success":true,"defaultSearch":"&#39;.$defaultSearch.&#39;"}
 } 
functionpostMethod(){
}

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Note: Key operations

$result = &#39;{"success":true,"defaultSearch":"&#39;.$defaultSearch.&#39;"}&#39;;//将待返回内容改为json格式
   echo $result;//HTML页面的json部分将从echo的输出获取json格式化数据对，因此echo输出内容需要为json格式

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HTML receive (receive data pairs in json format returned by php echo through GET)

<script type=&#39;text/javascript&#39;>
        $(document).ready(function(){ 
            $.ajax({ 
                type: "GET",     
                url: "default_search.php?data=" + value,//value为HTML向url发送的内容体，在php中可以通过超全局变量收集
                dataType: "json",
               //data为php使用echo返回的json格式的数据对,通过data.name的形式即可以使用name对应的value
  　　　　　　　　 success: function(data) {
　　　　　　　　　　　　if (data.success) { 
　　　　　　　　　　　　　　alert(data.defaultSearch);　　　　　　　　　　　　
　　　　　　　　　　　　} 
　　　　　　　　　 },
                error: function(jqXHR){     
                   alert("发生错误：" + jqXHR.status);  
                },     
            });
        });
</script>

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Key operations:

$.ajax({
　　 type: "GET",
        url: "default_search.php?data=" + "searchArray",
        dataType: "json",
        success: function(data) {
   　　  If(data.success){alert(data.defaultSearch);}
//data为php使用echo输出的json格式的数据对,通过data.name的形式即可以使用name对应的value
         },
         error: function(jqXHR){     
         　　alert("发生错误：" + jqXHR.status);  
         },     
    });
});

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