javascript - 通过Mysql打印内容的打印命令

Question

我知道如何在 PHP 文件中给出打印命令，但它会打印整个页面。

我只需要从那个页面打印一些文本，只有 来 self 的 webpage .

这就是我回应结果的方式:

<table id="myHeader" class="table table-striped table-hover table-bordered table-responsive"><thead>
            <tr>
                <th>Sr.</th>
                <th>Question</th>
                <th class="mobiile">Your Answer</th>
                <th>Right Answer</th>
                <th>Marks</th>
              </tr>
</thead><tbody>           
<?php   
    $i=0;
        while($lrow=$lstmt->fetch(PDO::FETCH_ASSOC))
        {
            extract($lrow);
            $i++;

?>
<tr>
<td><?php echo $i; ?></td>
<td><?php $qrn = $QRN; ?><?php 
$qilstmt = $user->runQuery("SELECT * FROM mcq WHERE QRN=:lrn ");
$qilstmt->bindparam(":lrn",$qrn);
$qilstmt->execute();
$qilr=$qilstmt->fetch(PDO::FETCH_ASSOC);
$qiilstmt = $user->runQuery("SELECT * FROM tf WHERE QRN=:lrn ");
$qiilstmt->bindparam(":lrn",$qrn);
$qiilstmt->execute();
$qiilr=$qiilstmt->fetch(PDO::FETCH_ASSOC); 
$qiiilstmt = $user->runQuery("SELECT * FROM fb WHERE QRN=:lrn ");
$qiiilstmt->bindparam(":lrn",$qrn);
$qiiilstmt->execute();
$qiiilr=$qiiilstmt->fetch(PDO::FETCH_ASSOC);
if($qilstmt->rowCount() == 1){
echo $qilr['Question']; 
}
elseif($qiilstmt->rowCount() == 1){
echo $qiilr['Question']."&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(True OR False)"; 
}
 else { 
echo $qiiilr['Question'];  }?></td>
<td><?php 
if($Ans == ""){
    echo "No Answer";
}
else {echo $Ans;} ?></td>
<td><?php 
if($qilstmt->rowCount() == 1){
echo $rans = $qilr['RO']; 
}
elseif($qiilstmt->rowCount() == 1){
echo $rans = $qiilr['RO']; 
}
 else { 
echo $rans = $qiiilr['RO'];  }?></td>
<td><?php
if($rans == $Ans){
    $calc = $user->runQuery("SELECT * FROM students_records WHERE ARN=:lrn ");
$calc->bindparam(":lrn",$arn);
$calc->execute();
$calcRow=$calc->fetch(PDO::FETCH_ASSOC);
$fcalc = $calcRow['Marks'];
$lcalc = $fcalc + 1;
if($calcRow['Fixed'] == "N"){
$arecord = $user->runQuery("UPDATE students_records SET Marks=:user_arn WHERE ARN=:user_qrn");
$arecord->bindparam(":user_qrn",$arn);
$arecord->bindparam(":user_arn",$lcalc);
$arecord->execute();
}
    echo $mci = "1";
}
else {echo "0";}?></td></tr>
    <?php
    }
    $llcalc = "Y";
    $updatel = $user->runQuery("UPDATE students_records SET Fixed=:user_larn WHERE ARN=:user_lqrn");
$updatel->bindparam(":user_lqrn",$arn);
$updatel->bindparam(":user_larn",$llcalc);
$updatel->execute();
    ?>
<tr>
<td></td><td></td><td></td><td></td><td></td>
</tr>
<tr>
<td></td><td></td><td></td>
<td><strong>Total:</strong></td>
<td><strong><?php
$tcalc = $user->runQuery("SELECT * FROM students_records WHERE ARN=:lrn ");
$tcalc->bindparam(":lrn",$arn);
$tcalc->execute();
$tcalcRow=$tcalc->fetch(PDO::FETCH_ASSOC);
echo $total = $tcalcRow['Marks'];
?></strong></td>
</tr>
</tbody></table>
<?php
}
?>

所以，我想知道我应该给打印按钮什么命令，以便它只打印上面的代码而不是整个网页....

提前致谢

Answer 1

正如@CBroe 所说，这与 PHP 无关，您需要为此使用 CSS。

有很多方法可以制作用于打印的 CSS，恕我直言，最好的方法是使用 HTML:

<link rel="stylesheet" type="text/css" href="print.css" media="print">

哪里media="print"是告诉浏览器使用哪个 CSS 进行打印的部分。

在您的 print.css 中，您可以按照自己的方式自定义页面，例如，如果您不想在打印页面中显示图像，只需将其添加到那里即可:

/* for example you don't need a navbar on a printed page. */
.navbar {
    display: none;
}

通过查看您的打印按钮，它似乎不起作用，向其中添加以下代码:

<button class="btn btn-large btn-success" onClick="window.print()">Print</button>