【问题标题】:Top right cell in table is not showing表格中的右上角单元格未显示
【发布时间】:2012-09-21 08:02:06
【问题描述】:

在 Stack Overflow 几个人的帮助下,我的网页几乎完美。

我有一个从数据库中提取信息的 PHP 表。但是,由于某种原因,它将右上角的单元格留空。有 3 列和大约 200 行,唯一显示空白的单元格是右上角。

如果有人可以发布更改内容的示例代码,那就太好了。我确定这很简单,我很可能只是盯着它太久了!

表格代码在底部附近:

<?php include("header.html"); ?>

<center>
<?php
    /*
        Place code to connect to your DB here.
    */
    include('database.php');    // include your code to connect to DB.

    $tbl_name="list";       //your table name
    // How many adjacent pages should be shown on each side?
    $adjacents = 3;

    /* 
       First get total number of rows in data table. 
       If you have a WHERE clause in your query, make sure you mirror it here.
    */
    $query = "SELECT COUNT(*) as num FROM $tbl_name";
    $total_pages = mysql_fetch_array(mysql_query($query));
    $total_pages = $total_pages[num];

    /* Setup vars for query. */
    $targetpage = "index.php";  //your file name  (the name of this file)
    $limit = 1001;                              //how many items to show per page
    $page = $_GET['page'];
    if($page) 
        $start = ($page - 1) * $limit;          //first item to display on this page
    else
        $start = 0;                             //if no page var is given, set start to 0

    /* Get data. */
    $sql = "SELECT website FROM $tbl_name LIMIT $start, $limit";
    $result = mysql_query($sql);

    /* Setup page vars for display. */
    if ($page == 0) $page = 1;                  //if no page var is given, default to 1.
    $prev = $page - 1;                          //previous page is page - 1
    $next = $page + 1;                          //next page is page + 1
    $lastpage = ceil($total_pages/$limit);      //lastpage is = total pages / items per page, rounded up.
    $lpm1 = $lastpage - 1;                      //last page minus 1

    /* 
        Now we apply our rules and draw the pagination object. 
        We're actually saving the code to a variable in case we want to draw it more than once.
    */
    $pagination = "";
    if($lastpage > 1)
    {   
        $pagination .= "<div class=\"pagination2\">";
        //previous button
        if ($page > 1) 
            $pagination.= "<a href=\"$targetpage?page=$prev\">&lt; previous</a>";
        else
            $pagination.= "<span class=\"disabled\">&lt; previous</span>";  

        //pages 
        if ($lastpage < 7 + ($adjacents * 2))   //not enough pages to bother breaking it up
        {   
            for ($counter = 1; $counter <= $lastpage; $counter++)
            {
                if ($counter == $page)
                    $pagination.= "<span class=\"current\">$counter</span>";
                else
                    $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";                 
            }
        }
        elseif($lastpage > 5 + ($adjacents * 2))    //enough pages to hide some
        {
            //close to beginning; only hide later pages
            if($page < 1 + ($adjacents * 2))        
            {
                for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
                {
                    if ($counter == $page)
                        $pagination.= "<span class=\"current\">$counter</span>";
                    else
                        $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";                 
                }
                $pagination.= "...";
                $pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
                $pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";       
            }
            //in middle; hide some front and some back
            elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
            {
                $pagination.= "<a href=\"$targetpage?page=1\">1</a>";
                $pagination.= "<a href=\"$targetpage?page=2\">2</a>";
                $pagination.= "...";
                for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
                {
                    if ($counter == $page)
                        $pagination.= "<span class=\"current\">$counter</span>";
                    else
                        $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";                 
                }
                $pagination.= "...";
                $pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
                $pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";       
            }
            //close to end; only hide early pages
            else
            {
                $pagination.= "<a href=\"$targetpage?page=1\">1</a>";
                $pagination.= "<a href=\"$targetpage?page=2\">2</a>";
                $pagination.= "...";
                for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
                {
                    if ($counter == $page)
                        $pagination.= "<span class=\"current\">$counter</span>";
                    else
                        $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";                 
                }
            }
        }

        //next button
        if ($page < $counter - 1) 
            $pagination.= "<a href=\"$targetpage?page=$next\">next &gt;</a>";
        else
            $pagination.= "<span class=\"disabled\">next &gt;</span>";
        $pagination.= "</div>\n";       
    }
?>

    <?php
$i = 0;
echo '<table style="table-layout:fixed; width:1050px;"><tr>'; 
        while($row = mysql_fetch_array($result))
{
    $i ++;
    if ($i<=2)
    {
      echo '<td style="word-wrap: break-word;">
         <div><a href="http://www.test.com/check.php?site='.$row[website].'">'.$row[website].'</a></div>
       </td>'; 
    }

    else
    {       
      echo '</tr><tr>';
      echo '<td style="word-wrap: break-word;"><div><a href="http://www.test.com/check.php?site='.$row[website].'">'.$row[website].'</a></div></td>'; 
      $i = 0;
   }
}  
echo '</tr></table>';
    ?>

<?=$pagination?>
</center>

<?php include("footer.html"); ?>

【问题讨论】:

  • 我首先需要查看生成的 HTML。
  • 我想知道为什么这么多人需要查看浏览器中的实际标记
  • while 循环中给出的增量值,然后用于测试要使用哪种显示方法,而此设置具有逻辑意义,不会导致问题但是,我必须问为什么它甚至在那里? $i 的值不会破坏循环或实际执行任何不同的代码集,无论它测试是真还是假,因为两个代码块是相同的。能否请您说明原因?

标签: php html mysql database html-table


【解决方案1】:

尝试移动

$i ++;

在循环结束之前的整个条件之后:

        else
        {       
          echo '</tr><tr>';
          echo '<td style="word-wrap: break-word;"><div><a href="http://www.test.com/check.php?site='.$row[website].'">'.$row[website].'</a></div></td>'; 
          $i = 0;
       }
       $i++;

【讨论】:

  • 问题出在变量 $i 的值已经为 1 时,您想填充第一行。
【解决方案2】:

这个while循环的逻辑是

设置标志($test)

第一次执行 while 循环 $test = 0 和 xxxx。

循环结束

$test 设置为 1

下一次和后续时间循环yyyy被执行

$test = 0;
 echo '<table style="table-layout:fixed; width:1050px;"><tr>'; 
    while($row = mysql_fetch_array($result))
    {

    if ($test==0){
      xxxx;
    }else{
    yyyy,
    }
   $test =1;
 }

【讨论】:

  • 对不起,大卫,但我不明白您帖子中问题的答案在哪里?
  • while 循环在条件为真时执行代码块。在这种情况下 while($row = mysql_fetch_array($result)) 循环执行到查询的最后一行,条件为错误的。在这种情况下,不需要计数器 $i。如果您查看问题的逻辑,则有两个条件。 Condition(1) 第一个条件只在第一行有效。 Condition(2) 对所有其他行都有效。这是标志的经典用法。因此,该标志在 for condition(1) 循环之前设置为 0,并在循环的第一次迭代后设置为 1。
  • 在 PHP 中使用 while 语句是对的。但是有问题的是,使用while语句是正确的。仅使用变量 $i 不是很好,因为对于输出表的第一行,$i 的增量太快了(请看我的答案)。
  • 您的答案有效。但问题的逻辑并不简单。只有2个州。 1) 标签和 2) 标签。不需要增量。正如我所说,这是使用标志的经典案例。见en.wikipedia.org/wiki/Flag_(computing)
  • 但是您必须在每行的第三个项目上添加新行,因此您需要一些增量或其他条件,例如来自数据库的数据。或者更好地在 while 循环之前重写代码。
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