【发布时间】：2015-12-01 22:21:12
【问题描述】：
我有嵌套的下拉菜单，我遇到了超过 2 次嵌套项目的格式问题。我很确定我用 Paint 制作的“蒙娜丽莎”质量图像将完美地展示它。
我正在寻找任何建议来更改我的代码以使其正常工作。
关于我的问题的图片：
代码：
<div class="form-group">
<label for="p-location"><?php _e( 'Location', 'tt' ); ?></label>
<select name="p-location" id="p-location" class="form-control required" title="<?php _e( 'Please select the location.', 'tt' ); ?>" data-placeholder="<?php _e( 'Choose a location', 'tt' ); ?>">
<option value=""></option>
<?php
$locations = get_terms('p-location', array( 'orderby' => 'slug', 'parent' => 0, 'hide_empty' => false) );
if ( isset( $_GET['p_location'] ) ) {
$get_location = $_GET['p_location'];
}
else {
$get_location = '';
}
$p_locations = get_the_terms( $p_id , 'p-location' );
if ( !empty( $p_locations ) ) {
foreach ( $p_locations as $p_location ) {
$get_location = $p_location->term_id;
break;
}
}
?>
<?php foreach ( $locations as $key => $location ) : ?>
<option value="<?php echo $location->term_id; ?>" <?php selected( $location->term_id, $get_location ); ?>>
<?php
echo $location->name;
$location2 = get_terms( 'p-location', array( 'orderby' => 'slug', 'parent' => $location->term_id, 'hide_empty' => false ) );
if( $location2 ) :
?>
<optgroup>
<?php foreach( $location2 as $key => $location2 ) : ?>
<option value="<?php echo $location2->term_id; ?>" class="level2" <?php selected( $location2->term_id, $get_location ); ?>>
<?php
echo $location2->name;
$location3 = get_terms( 'p-location', array( 'orderby' => 'slug', 'parent' => $location2->term_id, 'hide_empty' => false ) );
if( $location3 ) : ?>
<optgroup>
<?php foreach( $location3 as $key => $location3 ) : ?>
<option value="<?php echo $location3->term_id; ?>" class="level3" <?php selected( $location3->term_id, $get_location ); ?>>
<?php
echo $location3->name;
$location4 = get_terms( 'p-location', array( 'orderby' => 'slug', 'parent' => $location3->term_id, 'hide_empty' => false ) );
if( $location4 ) :
?>
<optgroup>
<?php foreach( $location4 as $key => $location4 ) : ?>
<option value="<?php echo $location4->term_id; ?>" class="level4" <?php selected( $location4->term_id, $get_location ); ?>>
<?php echo $location4->name; ?>
</option>
<?php endforeach; ?>
</optgroup>
<?php endif; ?>
</option>
<?php endforeach; ?>
</optgroup>
<?php endif; ?>
</option>
<?php endforeach; ?>
</optgroup>
<?php endif; ?>
</option>
<?php endforeach; ?>
</select>
</div>
【问题讨论】：