php 如何在 WordPress 中保存复选框元框？
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How to save a checkbox meta box in WordPress?
提问by Justine
I'm trying to add a checkbox into my custom meta box in WordPress and I ran into a problem with saving it - whenever I check the checkbox and update the post/page, it comes back unchecked again.
我正在尝试在 WordPress 的自定义元框中添加一个复选框，但在保存时遇到了问题 - 每当我选中该复选框并更新帖子/页面时，它都会再次未选中。
Here's the code I'm using:
这是我正在使用的代码：
add_meta_box(
'sl-meta-box-sidebar', // id
'Sidebar On/Off', // title
'sl_meta_box_sidebar', // callback function
'page', // type of write screen
'side', // context
'low' // priority
);
function sl_meta_box_sidebar() {
global $meta; sl_post_meta( $post->ID ); ?>
<input type="checkbox" name="sl_meta[sidebar]" value="<?php echo htmlspecialchars ($meta['sidebar']); ?>" />Check to turn the sidebar <strong>off</strong> on this page.
}
This creates the checkbox in the sidebar of the "Edit Page" screen, as it should, no problem there. I'm not sure what should I enter in the value of the checkbox, with text fields it obviously returns whatever was saved as meta information... I tried just using "checked" instead cause that would be my first guess (then simply check for the value when using this meta data), but it didn't save the checkbox either.
这会在“编辑页面”屏幕的侧边栏中创建复选框，这应该是没有问题的。我不确定我应该在复选框的值中输入什么，对于文本字段，它显然会返回保存为元信息的任何内容......用于使用此元数据时的值），但它也没有保存复选框。
Here's the function that saves all the meta data, which I assume causes this problem:
这是保存所有元数据的函数，我认为这会导致此问题：
function sl_save_meta_box( $post_id, $post ) {
global $post, $type;
$post = get_post( $post_id );
if( !isset( $_POST[ "sl_meta" ] ) )
return;
if( $post->post_type == 'revision' )
return;
if( !current_user_can( 'edit_post', $post_id ))
return;
$meta = apply_filters( 'sl_post_meta', $_POST[ "sl_meta" ] );
foreach( $meta as $key => $meta_box ) {
$key = 'meta_' . $key;
$curdata = $meta_box;
$olddata = get_post_meta( $post_id, $key, true );
if( $olddata == "" && $curdata != "" )
add_post_meta( $post_id, $key, $curdata );
elseif( $curdata != $olddata )
update_post_meta( $post_id, $key, $curdata, $olddata );
elseif( $curdata == "" )
delete_post_meta( $post_id, $key );
}
do_action( 'sl_saved_meta', $post );
}
add_action( 'save_post', 'sl_save_meta_box', 1, 2 );
It works perfectly for text fields, but the checkbox just won't save. I'm not sure if the saving function is wrong, or am I missing something about the value of the checkbox.
它适用于文本字段，但复选框无法保存。我不确定保存功能是否错误，或者我是否缺少有关复选框值的信息。
Any help appreciated!
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回答by rmlumley
I had trouble with this previously and here is how I solved it.
我以前遇到过这个问题，这是我解决它的方法。
First, creating the Checkbox.
首先，创建复选框。
<?php
function sl_meta_box_sidebar(){
global $post;
$custom = get_post_custom($post->ID);
$sl_meta_box_sidebar = $custom["sl-meta-box-sidebar"][0];
?>
<input type="checkbox" name="sl-meta-box-sidebar" <?php if( $sl_meta_box_sidebar == true ) { ?>checked="checked"<?php } ?> /> Check the Box.
<?php } ?>
Next, saving.
接下来，保存。
<?php
add_action('save_post', 'save_details');
function save_details($post_ID = 0) {
$post_ID = (int) $post_ID;
$post_type = get_post_type( $post_ID );
$post_status = get_post_status( $post_ID );
if ($post_type) {
update_post_meta($post_ID, "sl-meta-box-sidebar", $_POST["sl-meta-box-sidebar"]);
}
return $post_ID;
} ?>
