调用带有HTML变量

当组合框选择，我试图从数据库显示前n项调用带有HTML变量

我试图调用PHP函数“produse（$ _ POST）”用PHP函数选择标签中所选项目的值，代码是否正确？
SELECT SQL中的限制可以是代码中的限制吗？（ “$ SQL = ”SELECT * FROM表LIMIT $号“;”）

<body> 

    <select name="n" onchange="document.write('<?php produse($_POST); ?>')"> 
     <option disabled selected value> -- select an option -- </option> 
     <option value=2>2</option> 
     <option value=3>3</option> 
     <option value=4>4</option> 
    </select> 

    <br> <br> <br> 

    <?php 
     function produse($number){ 

      $servername = "localhost:3306"; 
      $username = "root"; 
      $password = ""; 
      $dbname = "produse"; 

      // Create connection 
      $conn = mysqli_connect($servername, $username, $password, $dbname); 
      // Check connection 
      if (!$conn) { 
       die("Connection failed: " . mysqli_connect_error()); 
      } 
      $number = intval($_GET['number']); 
      $sql = "SELECT * FROM table LIMIT $number"; 
      $result = mysqli_query($conn, $sql); 

      if (mysqli_num_rows($result) > 0) { 
      // output data of each row 
       while($row = mysqli_fetch_assoc($result)) { 
        echo "id_produs: " . $row["id_produs"]. " - Denumire: " . $row["Denumire"]. " - Pret " . $row["Pret"]. " - Descriere" . $row["Descriere"] ."<br>"; 
       } 
      } else { 
       echo "0 results"; 
      } 

      mysqli_close($conn); 
     } 
    ?> 


</body>

来源

2017-06-03 Dan Adrian

您可以使用jQuery AJAX调用PHP函数。 – Webinion

你不能像这样组合PHP和JavaScript。使用阿贾克斯代替 –

ohhhh，谢谢！ –

它单独使用jQuery像这样使用：

HTML（html_page.html）：

<!DOCTYPE html> 
<html> 
    <head> 
    <meta charset="utf-8" /> 
    <title>Your HTML Page title</title> 
    </head> 
    <body> 
    <div> 
     <select id="my_select"> 
     <option value="" selected>Choose</option> 
     <option value="1">Option1</option> 
     <option value="2">Option2</option> 
     </select> 
    </div> 
    <hr /> 
    <div class="dynamic_content"></div> 
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> 
    <script> 
     $('#my_select').change(function() { 
     showResult($(this).val()); 
     }); 

     function showResult(value) { 

     if (value) { 
      $('.dynamic_content').load('php_page.php?number=' + value); 
     } 
     } 
    </script> 
    </body> 
</html>

PHP页面（php_page.php）：

<?php 

    //intval($_GET['item']) will return 0 and considered as FALSE if the requested parameter is not a number 
    if (isset($_GET['number']) && !empty($_GET['number']) && intval($_GET['number']) { 

    $number = intval($_GET['number']); 

    //I DID NOT TEST YOUR PHP CODE 

    $servername = "localhost:3306"; 
    $username = "root"; 
    $password = ""; 
    $dbname = "produse"; 

    // Create connection 
    $conn = mysqli_connect($servername, $username, $password, $dbname); 
    // Check connection 
    if (!$conn) { 
     die("Connection failed: " . mysqli_connect_error()); 
    } 
    $sql = "SELECT * FROM table LIMIT $number"; 
    $result = mysqli_query($conn, $sql); 

    if (mysqli_num_rows($result) > 0) { 
    // output data of each row 
     while($row = mysqli_fetch_assoc($result)) { 
      echo "id_produs: " . $row["id_produs"]. " - Denumire: " . $row["Denumire"]. " - Pret " . $row["Pret"]. " - Descriere" . $row["Descriere"] ."<br>"; 
     } 
    } else { 
     echo "0 results"; 
    } 

    mysqli_close($conn); 
    } 
?>

来源

2017-06-03 08:00:32 nekiala

调用带有HTML变量

回答

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