php - 根据数据库中的值选中复选框

Question

我有一个从数据库获取“分支”的代码。每个公司可以有多个“分支机构”。

唯一的问题是，那是行不通的。你们能弄清楚出了什么问题吗？

$getbranches = "SELECT * FROM branches ORDER BY naam ASC";
$querygetbranches = mysql_query($getbranches);

while($rijbranche = mysql_fetch_assoc($querygetbranches))
{
    echo "<tr>";
    echo "<td width='400'>";
    echo $rijbranche['naam'];
    echo "</td>";
    echo "<td>";
    $get2 = "SELECT * FROM bedrijf_branche WHERE bedrijf_id = '$id'";
    $query2 = mysql_query($get2);
    while ($rij20 = mysql_fetch_assoc($query2))
    {
        $branche_id = $rij20['branche_id'];
    }
    if($branche_id == $rijbranche['id_branche']){
        ?>
        <input type="checkbox" name="branche[]" value="<?php echo $rijbranche['id_branche']; ?>" CHECKED></input>
        <?php
    }
    else
    {
        ?>
        <input type="checkbox" name="branche[]" value="<?php echo $rijbranche['id_branche']; ?>"></input>
        <?php
    }
    echo "</td>";
}

Answer 1

尝试以下代码

<?php

$id = $_GET['id'];

// Output BRANCHES
$getbranches = "SELECT * FROM branches ORDER BY naam ASC";
$querygetbranches = mysql_query($getbranches);

while ($rijbranche = mysql_fetch_array($querygetbranches)) {
  echo '  <tr>' . "\n";
  echo '    <td width="400">' . $rijbranche['naam'] . '</td>' . "\n";

  // Output CHECKBOX
  $get2 = mysql_query("SELECT * FROM bedrijf_branche WHERE bedrijf_id = '" . $id . "' AND branche_id = '" . $rijbranche['id_branche'] . "'");
  $rij20 = mysql_fetch_array($get2);
  $branche_id = $rij20['branche_id'];

  if ($branche_id == $rijbranche['id_branche']) {
    $checkbox = '<input type="checkbox" name="branche[]" value="' . $rijbranche['id_branche'] . '" checked="checked" />';
  }
  else {
    $checkbox = '<input type="checkbox" name="branche[]" value="' . $rijbranche['id_branche'] . '" />';
  }

  echo '    <td>' . $checkbox . '</td>' . "\n";
  echo '  </tr>' . "\n";
}

?>

发现我在上面的代码中修复了几个错误。

1. 您正在关闭 <input>字段不正确
2. 你的第二个while()循环是不必要的，因为应该只返回一行
3. 您必须添加branche_id到你的第二个 mysql_query!
4. 不要关闭并重新打开您的 <?php ?>当您只需添加 echo 时，为每个 HTML 行添加标签