Question

使用此代码，所选选项将保存到数据库中：

<select name="menu-item-visibility[<?php echo $item_id; ?>][]" id="edit-menu-item-visibility-<?php echo $item_id; ?>" class="chzn-select" multiple="true"
    <option value="US" <?php $val = get_post_meta( $item_id, 'locations', true ); if ( is_array( $val ) ) { if ( in_array( "US", $val ) ) { echo "selected='selected'"; } else { echo ""; } } ?> >United States</option>
    <option value="TH" <?php $val = get_post_meta( $item_id, 'locations', true ); if ( is_array( $val ) ) { if ( in_array( "TH", $val ) ) { echo "selected='selected'"; } else { echo ""; } } ?> >Thailand</option>
    ...
</select>

使用此代码，它们不是：

<select name="menu-item-visibility[<?php echo $item_id; ?>][]" id="edit-menu-item-visibility-<?php echo $item_id; ?>" class="chzn-select" multiple="true" data-placeholder="Select Countries">
<?php
$countries = array('US' => 'United States', "TH" => "Thailand");
$vals = get_post_meta( $item_id, 'locations', true );
foreach($countries as $key => $value) { 
?>
    <option value="<?php echo $key;?>"
    <?php echo (is_array( $vals ) && in_array( $key, $vals ) ) ? "selected='selected'" : ''; ?> >
    <?php echo $value;?>
    </option>
<?php
}
?>
</select>

为什么不呢？

这是将选项发送到数据库的方式：

/* Put locations in the database. */
function csmi_update_locations( $menu_id, $menu_item_db_id, $args ) {
    $meta_value = get_post_meta( $menu_item_db_id, 'locations', true );
    if ( isset( $_POST[ 'menu-item-visibility' ][ $menu_item_db_id ] ) ) { 
        $new_meta_value = $_POST[ 'menu-item-visibility' ][ $menu_item_db_id ]; 
        if ( !isset( $new_meta_value ) ) {
            delete_post_meta( $menu_item_db_id, 'locations', $meta_value );
        }
        elseif ( $meta_value !== $new_meta_value ) {
            update_post_meta( $menu_item_db_id, 'locations', $new_meta_value );
        }
    }
}

以下是视图源中的HTML请求。

<p class="field-visibility description description-wide">
...
    <select name="menu-item-visibility[4][]" id="edit-menu-item-visibility-4" class="chzn-select" multiple="true" data-placeholder="Select Countries">
        <option value="US"  > United States </option>
        <option value="TH"  > Thailand </option>
    </select>
</p>

Answer 1

请像这样使用：

<select name="menu-item-visibility[<?php echo $item_id; ?>][]" id="edit-menu-item-visibility-<?php echo $item_id; ?>" class="chzn-select" multiple="true" data-placeholder="Select Countries">
<?php
$countries = array('US' => 'United States', "TH" => "Thailand");
$vals = get_post_meta( $item_id, 'locations', true );
foreach($countries as $key => $value) { 
?>
    <option value="<?php echo $key;?>"
    <?php echo (is_array( $vals ) && in_array( $key, $vals ) ) ? "selected='selected'" : ''; ?> >
    <?php echo $value;?>
    </option>
<?php
}
?>
</select>

Answer 2

这很令人尴尬。问题出在我的WordPress版本上。请忽略。

为什么没有选项保存到数据库？

2 个答案: