说到编码，我完全是个新手。我已经用一些自定义的帖子类型构建了一个主题。在自定义贴子类型中，我使用生成器工具创建了一个自定义元框。它几乎做了我需要的一切，除了。。。
。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
在下面的代码中，您将看到一个名为“文档链接”的字段。在前端，它有一个按钮，允许用户选择媒体库项目，然后将URL插入“document-link”字段/例如mysite。com/library/intro。pdf格式
在我的主题中，链接显示为使用PostTablePro插件的按钮。
由于插件的限制，要显示按钮，插件需要保存的记录保存链接的完整html，如下所示。。。
<a class="btn btn-outline-info btn-block" href="mysite.com/library/intro.pdf" aria-label="Download File"><i class="fa fa-external-link" aria-hidden="true"></i></a>
这很容易，但是。。我想根据文件类型（pdf图标、word图标等）更改按钮的颜色/图标。
在下面的完整代码中，您将看到一个名为“document mime type”的选择字段，它保存文件类型。
我想要实现的是在页面上保存。。。包含普通url的字段“document link”用完整的html格式包装，您将在上面的代码中看到的a类和I类根据在名为“document mime type”的字段中选择的文件类型进行更改。
我想是某种if-then-else的说法，但过去几天我一直在努力解决这个问题，我无法让我的大脑进入一个起始位置。。。。谁能教我如何从几种文件类型开始，我可以从那里开始。。。。THANK YOU
<?php
/**
* Everything from here down is the meta box that doesn\'t do what i need it to.
* im not familiar with below i used a generator online change away it confuses me...
*/
class Rational_Meta_Box {
private $screens = array(
\'library_ims\',
);
private $fields = array(
array(
\'id\' => \'document-link\',
\'label\' => \'Document Link\',
\'type\' => \'media\',
),
array(
\'id\' => \'ims-reference\',
\'label\' => \'IMS Reference\',
\'type\' => \'text\',
),
array(
\'id\' => \'document-mime-type\',
\'label\' => \'Document MIME Type\',
\'type\' => \'select\',
\'options\' => array(
\'fa fa-file-word-o\' => \'MS Word\',
\'fa-file-pdf-o\' => \'Adobe PDF\',
\'fa-file-excel-o\' => \'MS Excel\',
\'fa-file-powerpoint-o\' => \'MS PowerPoint\',
\'fa-external-link\' => \'External Link\',
\'fa-file-video-o\' => \'Video File\',
\'fa-file-image-o\' => \'Image File\',
\'fa-file-archive-o\' => \'Archive (ZIP) File\',
\'fa-file-audio-o\' => \'Audio File\',
\'fa-globe\' => \'Earth (KMZ) File\',
),
),
array(
\'id\' => \'password\',
\'label\' => \'Password\',
\'type\' => \'password\',
),
array(
\'id\' => \'rev\',
\'label\' => \'Rev\',
\'type\' => \'text\',
),
array(
\'id\' => \'annex-sl-ref\',
\'label\' => \'Annex SL Ref\',
\'type\' => \'select\',
\'options\' => array(
\'Not Applicable\',
\'Leadership\',
\'Planning\',
\'Support\',
\'Operation\',
\'Evaluation\',
\'Improvement \',
),
),
);
/**
* Class construct method. Adds actions to their respective WordPress hooks.
*/
public function __construct() {
add_action( \'add_meta_boxes\', array( $this, \'add_meta_boxes\' ) );
add_action( \'admin_footer\', array( $this, \'admin_footer\' ) );
add_action( \'save_post\', array( $this, \'save_post\' ) );
}
/**
* Hooks into WordPress\' add_meta_boxes function.
* Goes through screens (post types) and adds the meta box.
*/
public function add_meta_boxes() {
foreach ( $this->screens as $screen ) {
add_meta_box(
\'document-overview\',
__( \'Document Overview\', \'rational-metabox\' ),
array( $this, \'add_meta_box_callback\' ),
$screen,
\'normal\',
\'high\'
);
}
}
/**
* Generates the HTML for the meta box
*
* @param object $post WordPress post object
*/
public function add_meta_box_callback( $post ) {
wp_nonce_field( \'document_overview_data\', \'document_overview_nonce\' );
$this->generate_fields( $post );
}
/**
* Hooks into WordPress\' admin_footer function.
* Adds scripts for media uploader.
*/
public function admin_footer() {
?><script>
// https://codestag.com/how-to-use-wordpress-3-5-media-uploader-in-theme-options/
jQuery(document).ready(function($){
if ( typeof wp.media !== \'undefined\' ) {
var _custom_media = true,
_orig_send_attachment = wp.media.editor.send.attachment;
$(\'.rational-metabox-media\').click(function(e) {
var send_attachment_bkp = wp.media.editor.send.attachment;
var button = $(this);
var id = button.attr(\'id\').replace(\'_button\', \'\');
_custom_media = true;
wp.media.editor.send.attachment = function(props, attachment){
if ( _custom_media ) {
$("#"+id).val(attachment.url);
} else {
return _orig_send_attachment.apply( this, [props, attachment] );
};
}
wp.media.editor.open(button);
return false;
});
$(\'.add_media\').on(\'click\', function(){
_custom_media = false;
});
}
});
</script><?php
}
/**
* Generates the field\'s HTML for the meta box.
*/
public function generate_fields( $post ) {
$output = \'\';
foreach ( $this->fields as $field ) {
$label = \'<label for="\' . $field[\'id\'] . \'">\' . $field[\'label\'] . \'</label>\';
$db_value = get_post_meta( $post->ID, \'document_overview_\' . $field[\'id\'], true );
switch ( $field[\'type\'] ) {
case \'media\':
$input = sprintf(
\'<input class="regular-text" id="%s" name="%s" type="text" value="%s"> <input class="button rational-metabox-media" id="%s_button" name="%s_button" type="button" value="Upload/Link" />\',
$field[\'id\'],
$field[\'id\'],
$db_value,
$field[\'id\'],
$field[\'id\']
);
break;
case \'select\':
$input = sprintf(
\'<select id="%s" name="%s">\',
$field[\'id\'],
$field[\'id\']
);
foreach ( $field[\'options\'] as $key => $value ) {
$field_value = !is_numeric( $key ) ? $key : $value;
$input .= sprintf(
\'<option %s value="%s">%s</option>\',
$db_value === $field_value ? \'selected\' : \'\',
$field_value,
$value
);
}
$input .= \'</select>\';
break;
default:
$input = sprintf(
\'<input %s id="%s" name="%s" type="%s" value="%s">\',
$field[\'type\'] !== \'color\' ? \'class="regular-text"\' : \'\',
$field[\'id\'],
$field[\'id\'],
$field[\'type\'],
$db_value
);
}
$output .= $this->row_format( $label, $input );
}
echo \'<table class="form-table"><tbody>\' . $output . \'</tbody></table>\';
}
/**
* Generates the HTML for table rows.
*/
public function row_format( $label, $input ) {
return sprintf(
\'<tr><th scope="row">%s</th><td>%s</td></tr>\',
$label,
$input
);
}
/**
* Hooks into WordPress\' save_post function
*/
public function save_post( $post_id ) {
if ( ! isset( $_POST[\'document_overview_nonce\'] ) )
return $post_id;
$nonce = $_POST[\'document_overview_nonce\'];
if ( !wp_verify_nonce( $nonce, \'document_overview_data\' ) )
return $post_id;
if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE )
return $post_id;
foreach ( $this->fields as $field ) {
if ( isset( $_POST[ $field[\'id\'] ] ) ) {
switch ( $field[\'type\'] ) {
case \'email\':
$_POST[ $field[\'id\'] ] = sanitize_email( $_POST[ $field[\'id\'] ] );
break;
case \'text\':
$_POST[ $field[\'id\'] ] = sanitize_text_field( $_POST[ $field[\'id\'] ] );
break;
}
update_post_meta( $post_id, \'document_overview_\' . $field[\'id\'], $_POST[ $field[\'id\'] ] );
} else if ( $field[\'type\'] === \'checkbox\' ) {
update_post_meta( $post_id, \'document_overview_\' . $field[\'id\'], \'0\' );
}
}
}
}
new Rational_Meta_Box;
