php - 我希望能够在每次单击随机播放按钮时随机播放问题

Question

HTML

<form name="form1" method="post" action="">
<table width="254" border="0" align="center">
    <tr>
        <td width="185" height="5"><p align="left">
                <label for="textfield"></label>
                <?
                $sqlretrive = mysql_query("Select * from tb_classes");
                $recordcount =  mysql_affected_rows(); 
                ?>
                <select name="classname" id="staffid2" class="form-control" required >
                    <option value="">Select Class Name</option>
                    <? while ($row = mysql_fetch_array($sqlretrive)){ ?>
                    <option value="<?= $row['id'] ?>">
                        <?= $row['classname'] ?>
                    </option>
                    <? }?>
                </select>
            </p></td>
    </tr>
    <tr>
        <td height="1">
            <?
            $sqlretrive = mysql_query("Select * from tb_subjects_reg where status =1");
            $recordcount =  mysql_affected_rows(); 
            ?>
            <select name="subjectname" id="select" class="form-control" required>
                <option value="">Select Subject</option>
                <? while ($row = mysql_fetch_array($sqlretrive)){ ?>
                <option value="<?= $row['id'] ?>">
                    <?= $row['subjectname'] ?>
                </option>
                <? }?>
                <label for="subjectname">
                </label>
                <select name="subjectname" id="subjectname">
                </select></td>
    </tr>
    <tr>
        <td height="2"><div align="right">
                <input type="submit" name="find" id="find" value="Find">
            </div></td>
    </tr>
</table>

<table  class="table toggle-square" data-filter="#table_search" width="541" border="0" align="center">
    <tr align="center" valign="bottom" bgcolor="#FBA774">
        <td colspan="4"><input type="submit" name="shuffle" id="shuffle" value="SHUFFLE QUESTIONS" class="form-control"></td>
    </tr>
    <tr align="center" valign="bottom" bgcolor="#FBA774">
        <td width="182"><div align="center">Question Number</div></td>
        <td align="center" valign="bottom"><div align="center">Question</div></td>
        <td align="center" valign="bottom"><div align="center"></div></td>
        <td align="center" valign="bottom"><div align="center"></div></td>
    </tr>
    <?
    $sqlretrive = mysql_query("Select * from tb_addquestion");
    $recordcount =  mysql_affected_rows();
    $i=0;
    while ($row = mysql_fetch_array($sqldisplayresult)){
    $i++
    ?>
    <tr>
        <td><div align="center">
                <?= $i ?>
            </div></td>
        <td width="183"><div align="center"><a href="viewquestion.php?subject=<?= $row['subject'] ?>&class=<?= $row['class'] ?>&number=<?= $row['question_number'] ?>"></a>
                <?= $row['question'] ?>
            </div></td>
        <td width="100"><div align="center"><a href="viewquestion.php?subject=<?= $row['subject'] ?>&class=<?= $row['class'] ?>&number=<?= $row['question_number'] ?>&id=<?= $row['id'] ?>">View Question</a></div></td>
        <td width="58"><div align="center"><a href="viewquestion.php?subject=<?= $row['subject'] ?>&class=<?= $row['class'] ?>&number=<?= $row['question_number'] ?>"><img src="img/edit.png" alt="" />Edit </a></div></td>

    </tr>
    <?   } ?>
    <a href="viewquestion.php?subject=<?= $row['subject'] ?>&class=<?= $row['class'] ?>&number=<?= $row['question_number'] ?>"></a></td>

    <tr>
        <td colspan="4">
            <div align="right"></div>
        </td>
    </tr>

</table>
<p>&nbsp;</p>

PHP

<? include('inc/header.php');
     ?>

    <? 
    include("connect.php"); 
    ?>
    <?
    if (isset($_POST['shuffle'])) {
        $classname = $_POST['classname'];
        $subjectname = $_POST['subjectname'];
        $sqldisplayresult = mysql_query("Select * from tb_addquestion WHERE class = '$classname' and subject='$subjectname' and status = 1 ORDER BY RAND()");
    }
    //display score for the specified class and subject in the current or specified session and term
    if (isset($_POST['find'])) {
        $classname = $_POST['classname'];
        $subjectname = $_POST['subjectname'];

    $sqldisplayresult = mysql_query("Select * from tb_addquestion WHERE class = '$classname' and subject='$subjectname' ");
    }

    ?>

在我按类别和主题进行筛选后，它会显示问题列表。

我希望我的随机播放按钮的工作方式是，一旦我单击它，它就会自动重新播放并从数据库中随机选择问题。

Answer 1

那么为什么不像第一个请求中那样使用 ORDER BY RAND() 呢？

另一种方法可能是使用 shuffle()从数据库请求数据后，使用 PHP 方法。

无论如何，如果您希望随机播放是动态的，则必须使用 Ajax，也许使用 jQuery's .ajax()方法会更容易