Question

我需要允许我的用户在下拉列表中选择一个选项值，页面将刷新页面，并且数据库中的列将在页面上更新。我该如何设置此行为？

 <script language="JavaScript">
        // this js autorehresh page if option was change

        function MM_jumpMenu(targ,selObj,restore){ //v3.0
        eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
        if (restore) selObj.selectedIndex=0;
        }
        </script>

     <?php
          //at first we must connect to DB
          //external
     require ('connectDB.php');
     ?>

     <form method="post">
        <select name="selected" onChange="MM_jumpMenu('parent',this,1)">
        <?php
        **// echo all id in table to options dropdown menu**
          $sql='SELECT id FROM lekcia1';
            $result=mysql_query($sql) or die(mysql_error($db));
            $a = 0;
            while ($recording=mysql_fetch_array($result)){
              $a ++;
              echo '<option value="'.$recording['selected'].'"> '.$a.' </option>';
            };
          ?>
        </select>
      </form>

      **<?php
        // query NOT WORK 
        $sql1='SELECT * FROM lekcia1 WHERE id='.$_GET['']; // Notice: Undefined index: selected
        $result1=mysql_query($sql1) or die(mysql_error($db));
        $recording1=mysql_fetch_array($result1);
      ?>**

      <ul>
        <li><?php echo $recording1['column1'];?></li>
        <li><?php echo $recording1['column2'];?></li>
        <li><?php echo $recording1['column3'];?></li>
      </ul>

Answer 1

查询仍然无法正常工作，所以这是我正确的代码。

<html>
<head>

 <script language="JavaScript">
  // this js autorehresh page if option was change
 function MM_jumpMenu(targ,selObj,restore){ //v3.0
 eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
 if (restore) selObj.selectedIndex=0;
  }
 </script>

  </head>
<body>
  <?php
  $host='localhost';    // this will ususally be 'localhost', but can sometimes differ
  $dbname='phpmyadmin'; // the name of the database that you are going to use for this project
  $user='root';         // the USERNAME that you created, or were given, to access your database
  $password='';         // the PASSWORD that you created, or were given, to access your database
  $db = mysql_connect($host, $user, $password) or die("Neda sa pripojit k MySQL serveru: " . mysql_error());
  mysql_select_db($dbname, $db) or die(mysql_error($db));
  mysql_query('SET NAMES UTF8');
  mysql_query('SET COLLATION_CONNECTION=uft8_general_ci');
  ?>

 <form method="post">
    <select name="selected" onChange="MM_jumpMenu('parent',this,1)">
    <?php
    // echo all id in table to options dropdown menu**
      $sql='SELECT id FROM lekcia1';
        $result=mysql_query($sql) or die(mysql_error($db));
        $a = 0;
        while ($recording=mysql_fetch_array($result)){
          $a ++;
          echo '<option value="'.$recording['selected'].'"> '.$a.' </option>';
        };
      ?>
     </select>
   </form>

     <?php
    // query NOT WORK
    $sql1="SELECT * FROM lekcia1 WHERE id='".$_POST['selected']."'"; // Notice: Undefined index:        selected
    $result1=mysql_query($sql1) or die(mysql_error($db));
    $recording1=mysql_fetch_array($result1);
  ?>


  <ul>
    <li><?php echo $recording['nazov_lekcie'];?></li>
    <li><?php echo $recording['cislo_ulohy'];?></li>
    <li><?php echo $recording['nazov_ulohy'];?></li>
  </ul>
  <?php
  //at first we must connect to DB
  //external
  //require ('connectDB.php');
  ?>



 </body>
 </html>

查询WHERE id ='。$ _ GET ['selected“]无法正常工作

1 个答案: