3

我有一个带有 PHP 'foreach' 的下拉菜单,我循环通过它来填充选择选项。这很好用。但是,我想做的是使用“optgroup”选项拥有各种子标签。在我返回的数组中,我有一个“蓝色”、“绿色”和“红色”的“类型”。如何根据 $album['type'] 将选择选项分成几组?

这是我的代码:

$query = mysql_query("SELECT * FROM background_albums);
$albums = array();
while($row = mysql_fetch_assoc($query)) {
    array_push($albums, $row);
}

<select name="backgroundList" id="backgroundList">
  <? foreach($albums as $album) { ?>
    <option value="<?=($row['id']);?>"><?=$row['title'];?></option>
  <? } ?>
</select>

这是我想在 foreach 循环中实现的那种事情:

if ($album['type'] == 'green')...

<optgroup label="Green Backgrounds">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
</optgroup>

if ($album['type'] == 'blue')...

<optgroup label="Blue Backgrounds">
      <option>5</option>
      <option>6</option>
      <option>7</option>
      <option>8</option>
</optgroup>
4

4 回答 4

14

尝试

<select name="backgroundList" id="backgroundList">
<?php
$album_type = '';
foreach ($albums as $album) {
  if ($album_type != $album['type']) {
    if ($album_type != '') {
      echo '</optgroup>';
    }
    echo '<optgroup label="'.ucfirst($album['type']).' Backgrounds">';
  }
  echo '<option value="'.$album['id'].'">'.htmlspecialchars($album['title']).'</option>';
  $album_type = $album['type'];    
}
if ($album_type != '') {
  echo '</optgroup>';
}
?>
</select>
于 2012-10-11T04:07:55.420 回答
4

在网上搜索了大量的各种帖子之后......然后进行了大量的试验和错误,我终于找到了一个效果很好的 optgroup 解决方案。

这段代码与 tagrin0 非常相似,但我想我会为它提供更多注释,以帮助其他可能想要清楚地了解如何使这项工作没有太多捏造和解释代码的新手。

希望它可以帮助某人。

这是表结构...

opt_id | grp_id | 选择名称 | grp名称 | 选择缩写...

echo '<select id="xxx" class="xxx"> select">';
echo '<option >Select an instance...</option>';

$dbc = mysqli_connect('localhost','xxx','xxx','xxx') or die('Error connecting to MySQL server.');

// run your query, something like
// "SELECT <optgroup>_ID, <option>_ID, <optgroup>_Name, <ption>_Name FROM [mysql table this data is stored in] ORDER BY groupID, optionID"

$select = "SELECT * FROM ci_opt ORDER BY grp_id, opt_id";

    $data  = @mysqli_query($dbc, $select) or die(mysql_error());

    // <optgroup> of the previous <option>
    $previous = "";

    // variable to set the first group
    $first_group = true;

    while($row = mysqli_fetch_array($data)) {

        // if this <option> changed <optgroup> from the previous one,
        // then add a new <optgroup>
        if ($row['grpName'] != $previous) {
            if (!$first_group) {
                echo '</optgroup>';
            } else {
                $first_group = false;
            }
            echo '<optgroup label="' . $row['grpName'] . '">';
            $previous = $row['grpName'];
        }

        // echo the current <option>
        // Note: I've also prepared the [onclick] for linking the select to an event

        echo '<option id="'. $row['optAbbrv'] .'" onclick="javascript:void()">' . ucwords($row['optName']) . '</option>';

    }
    // close the last <optgroup> tag
    echo '</optgroup>';
    // close the last <select> tag
    echo '</select>';
    // close the connection
    mysqli_close($dbc);

// 结束 php

于 2014-02-07T13:35:11.883 回答
2

检查类型是否从以前的值更改,然后发出适当的标签。

按类型对查询进行排序:

$query = mysql_query("SELECT * FROM background_albums order by type"); //ordered query

[...]

$type = null;

foreach ($albums as $album) {
  if ($album['type'] != $type) {  // type changed
    if ($type !== null) {
      echo '</optgroup>';  // close previous optgroup
    }
    $type = $album['type'];
    echo '<optgroup label="' . htmlspecialchars($type) . '">';  // start optgroup
  }

  [...]
}

echo '</optgroup>';  // close last optgroup
于 2012-10-11T03:57:57.900 回答
0

此方法不需要对数组进行排序

<select>
    <?php
    <!--  getting the groups to be one unique array -->
    $group= array_values(array_unique(array_column($album, 'type')));
             for ($i=0; $i < count($group); $i++) : ?>
    <!--  for N group print  -->
    <optgroup label="<?=$album[$i];?>">
        <!-- loop trough the hole array to check if you belong to the group -->
        <?php foreach ($album as $value): ?>
        <!-- if you belong then we print -->
        <?php if ($group_level[$i]==$value['type']): ?>
        <option>
            <?=$value['type'];?>
        </option>
        <?php endif ?>
        <?php endforeach ?>
    </optgroup>
    <?php endfor ?>
</select>
于 2020-05-13T10:19:28.263 回答