我正在尝试创建一个默认自定义字段下拉列表，其中包含在创建新帖子或编辑现有帖子时显示的DB中预先填充的值。
我知道如何添加单个自定义字段，并添加了以下几个字段
add_action(\'wp_insert_post\', \'set_default_custom_fields\');
function set_default_custom_fields($post_id) {
if ( $_GET[\'post_type\'] != \'page\' ) {
add_post_meta($post_id, \'email\', \'[email protected]\', true);
}
}
这对我来说很好，我可以看到带有默认值的自定义字段，但我不确定如何添加下拉列表来代替单个文本字段，我尝试了类似的方法，但似乎不起作用。
add_action(\'wp_insert_post\', \'set_default_custom_fields\');
function set_default_custom_fields($post_id) {
if ( $_GET[\'post_type\'] != \'page\' ) {
<select name="voodoo_dropdown" id="voodoo_dropdown">
<option<?php selected( add_post_meta($post->ID, \'voodoo_dropdown\', true), \'USA\' ); ?>>USA</option>
<option<?php selected( add_post_meta($post->ID, \'voodoo_dropdown\', true), \'Canada\' ); ?>>Canada</option>
<option<?php selected( add_post_meta($post->ID, \'voodoo_dropdown\', true), \'Mexico\' ); ?>>Mexico</option>
</select>
}
return ;
}
由于我缺乏知识，我不确定我做错了什么，或者需要做什么来完成这项任务
SO网友:dbeja
不要为自定义字段定义默认值，而应该像米洛所说的那样。在函数中应该有这样的内容。php。我试着按照你需要的做，但没有测试。
<?php
// action to add meta boxes
add_action( \'add_meta_boxes\', \'voodoo_dropdown_metabox\' );
// action on saving post
add_action( \'save_post\', \'voodoo_dropdown_save\' );
// function that creates the new metabox that will show on post
function voodoo_dropdown_metabox() {
add_meta_box(
\'voodoo_dropdown\', // unique id
__( \'Voodoo Dropdown\', \'mytheme_textdomain\' ), // metabox title
\'voodoo_dropdown_display\', // callback to show the dropdown
\'post\' // post type
);
}
// voodoo dropdown display
function voodoo_dropdown_display( $post ) {
// Use nonce for verification
wp_nonce_field( basename( __FILE__ ), \'voodoo_dropdown_nonce\' );
// get current value
$dropdown_value = get_post_meta( get_the_ID(), \'voodoo_dropdown\', true );
?>
<select name="voodoo_dropdown" id="voodoo_dropdown">
<option value="USA" <?php if($dropdown_value == \'USA\') echo \'selected\'; ?>>USA</option>
<option value="Canada" <?php if($dropdown_value == \'Canada\') echo \'selected\'; ?>>Canada</option>
<option value="Mexico" <?php if($dropdown_value == \'Mexico\') echo \'selected\'; ?>>MEXICO</option>
</select>
<?php
}
// dropdown saving
function voodoo_dropdown_save( $post_id ) {
// if doing autosave don\'t do nothing
if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE )
return;
// verify nonce
if ( !wp_verify_nonce( $_POST[\'voodoo_dropdown_nonce\'], basename( __FILE__ ) ) )
return;
// Check permissions
if ( \'page\' == $_POST[\'post_type\'] )
{
if ( !current_user_can( \'edit_page\', $post_id ) )
return;
}
else
{
if ( !current_user_can( \'edit_post\', $post_id ) )
return;
}
// save the new value of the dropdown
$new_value = $_POST[\'voodoo_dropdown\'];
update_post_meta( $post_id, \'voodoo_dropdown\', $new_value );
}
?>
如果你认为这太复杂了，你可以使用一个元盒插件，在Wordpress插件目录中找到一个已经有下拉列表的插件。
SO网友:Yogendra
一旦我完成了类似的需求，这是一个原始代码，希望这会有所帮助。
<?php
add_action( \'add_meta_boxes\', \'yss_custom_post_cat_add\' );
function yss_custom_post_cat_add() {
add_meta_box( \'my-meta-box-id\', \'My Custom Post Category\', \'yss_custom_post_cat\', \'post\', \'normal\', \'high\' );
}
function yss_custom_post_cat( $post ) {
$values = get_post_custom( $post->ID );
$selected = isset( $values[\'custom_post_cat_select\'] ) ? esc_attr( $values[\'custom_post_cat_select\'][0] ) : \'\';
wp_nonce_field( \'my_meta_box_nonce\', \'meta_box_nonce\' );
?>
<p>
<label for="custom_post_cat_select">Select your custom Post Category</label>
<br>
<select name="custom_post_cat_select" id="custom_post_cat_select">
<option value="picture" <?php selected( $selected, \'none\' ); ?>>(none)</option>
<option value="picture" <?php selected( $selected, \'picture\' ); ?>>Picture</option>
<option value="video" <?php selected( $selected, \'video\' ); ?>>Video</option>
<option value="sports" <?php selected( $selected, \'sports\' ); ?>>Sports</option>
<option value="guesswho" <?php selected( $selected, \'guesswho\' ); ?>>Guess Who</option>
<option value="decisionpoll" <?php selected( $selected, \'decisionpoll\' ); ?>>Decision Poll</option>
<option value="audio" <?php selected( $selected, \'audio\' ); ?>>Audio</option>
</select>
</p>
<?php
}
add_action( \'save_post\', \'yss_custom_post_cat_save\' );
function yss_custom_post_cat_save( $post_id ) {
// Bail if we\'re doing an auto save
if( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return;
// if our nonce isn\'t there, or we can\'t verify it, bail
if( !isset( $_POST[\'meta_box_nonce\'] ) || !wp_verify_nonce( $_POST[\'meta_box_nonce\'], \'my_meta_box_nonce\' ) ) return;
// if our current user can\'t edit this post, bail
if( !current_user_can( \'edit_post\' ) ) return;
// now we can actually save the data
$allowed = array(
\'a\' => array( // on allow a tags
\'href\' => array() // and those anchords can only have href attribute
)
);
// Probably a good idea to make sure your data is set
if( isset( $_POST[\'custom_post_cat_select\'] ) )
update_post_meta( $post_id, \'custom_post_cat_select\', esc_attr( $_POST[\'custom_post_cat_select\'] ) );
}
?>
