WordPress 添加可重复使用的自定义metabox 字段

PetitQ WordPress教程 2022-6-05 1.07K 0 0

所谓 WordPress metabox，就是类似文章编辑框下面 WP 自带的自定义字段的设置面板，通过 add_meta_box() 可以添加自定义面板，方便地输入相关信息，并在前端调用实现一些功能。

基本的面板添加代码网上很多，本文分享两个可重复使用的自定义 metabox 字段面板。

也想出现在这里？联系我们吧

section

代码一

预设两个字段，可重复添加，并以组数存储在数据库 wp_postmeta 表中

    add_action('admin_init', 'add_meta_boxes', 1);

```
    function add_meta_boxes() {
```

    	add_meta_box( 'repeatable-fields', 'Audio Playlist', 'repeatable_meta_box_display', 'post', 'normal', 'high');

```
    }
```
```
 
```

    function repeatable_meta_box_display() {

```
    	global $post;
```
```
 
```

    	$repeatable_fields = get_post_meta($post->ID, 'repeatable_fields', true);

```
 
```
```
 
```

    	wp_nonce_field( 'repeatable_meta_box_nonce', 'repeatable_meta_box_nonce' );

```
    ?>
```
```
    	<script type="text/javascript">
```

    jQuery(document).ready(function($) {

    	$('.metabox_submit').click(function(e) {

```
    		e.preventDefault();
```
```
    		$('#publish').click();
```
```
    	});
```

    	$('#add-row').on('click', function() {

    		var row = $('.empty-row.screen-reader-text').clone(true);

    		row.removeClass('empty-row screen-reader-text');

    		row.insertBefore('#repeatable-fieldset-one tbody>tr:last');

```
    		return false;
```
```
    	});
```

    	$('.remove-row').on('click', function() {

```
    		$(this).parents('tr').remove();
```
```
    		return false;
```
```
    	});
```
```
 
```

    	$('#repeatable-fieldset-one tbody').sortable({

```
    		opacity: 0.6,
```
```
    		revert: true,
```
```
    		cursor: 'move',
```
```
    		handle: '.sort'
```
```
    	});
```
```
    });
```
```
    	</script>
```
```
 
```

    	<table id="repeatable-fieldset-one" width="100%">

```
    	<thead>
```
```
    		<tr>
```
```
    			<th width="2%"></th>
```
```
    			<th width="30%">Name</th>
```
```
    			<th width="60%">URL</th>
```
```
    			<th width="2%"></th>
```
```
    		</tr>
```
```
    	</thead>
```
```
    	<tbody>
```
```
    	<?php
```
```
 
```
```
    	if ( $repeatable_fields ) :
```
```
 
```

    		foreach ( $repeatable_fields as $field ) {

```
    ?>
```
```
    	<tr>
```

    		<td><a class="button remove-row" href="#">-</a></td>

    		<td><input type="text" class="widefat" name="name[]" value="<?php if($field['name'] != '') echo esc_attr( $field['name'] ); ?>" /></td>

```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="<?php if ($field['url'] != '') echo esc_attr( $field['url'] ); else echo 'http://'; ?>" /></td>

```
    		<td><a class="sort">|||</a></td>
```
```
 
```
```
    	</tr>
```
```
    	<?php
```
```
    		}
```
```
    	else :
```
```
    		// show a blank one
```
```
    ?>
```
```
    	<tr>
```

    		<td><a class="button remove-row" href="#">-</a></td>

    		<td><input type="text" class="widefat" name="name[]" /></td>

```
 
```
```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="http://" /></td>

```
    <td><a class="sort">|||</a></td>
```
```
 
```
```
    	</tr>
```
```
    	<?php endif; ?>
```
```
 
```

    	<!-- empty hidden one for jQuery -->

    	<tr class="empty-row screen-reader-text">

    		<td><a class="button remove-row" href="#">-</a></td>

    		<td><input type="text" class="widefat" name="name[]" /></td>

```
 
```
```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="http://" /></td>

```
    <td><a class="sort">|||</a></td>
```
```
 
```
```
    	</tr>
```
```
    	</tbody>
```
```
    	</table>
```
```
 
```

    	<p><a id="add-row" class="button" href="#">Add another</a>

    	<input type="submit" class="metabox_submit" value="Save" />

```
    	</p>
```
```
 
```
```
    	<?php
```
```
    }
```
```
 
```

    add_action('save_post', 'repeatable_meta_box_save');

    function repeatable_meta_box_save($post_id) {

    	if ( ! isset( $_POST['repeatable_meta_box_nonce'] ) ||

    		! wp_verify_nonce( $_POST['repeatable_meta_box_nonce'], 'repeatable_meta_box_nonce' ) )

```
    		return;
```
```
 
```

    	if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)

```
    		return;
```
```
 
```

    	if (!current_user_can('edit_post', $post_id))

```
    		return;
```
```
 
```

    	$old = get_post_meta($post_id, 'repeatable_fields', true);

```
    	$new = array();
```
```
 
```
```
 
```
```
    	$names = $_POST['name'];
```
```
    	$urls = $_POST['url'];
```
```
 
```
```
    	$count = count( $names );
```
```
 
```

    	for ( $i = 0; $i < $count; $i++ ) {

```
    		if ( $names[$i] != '' ) :
```

    			$new[$i]['name'] = stripslashes( strip_tags( $names[$i] ) );

```
 
```
```
 
```
```
    		if ( $urls[$i] == 'http://' )
```
```
    			$new[$i]['url'] = '';
```
```
    		else
```

    			$new[$i]['url'] = stripslashes( $urls[$i] ); // and however you want to sanitize

```
    		endif;
```
```
    	}
```
```
 
```

    	if ( !empty( $new ) && $new != $old )

    		update_post_meta( $post_id, 'repeatable_fields', $new );

```
    	elseif ( empty($new) && $old )
```

    		delete_post_meta( $post_id, 'repeatable_fields', $old );

```
    }
```

前端调用

    <?php $repeatable_fields = get_post_meta( $post->ID, 'repeatable_fields', true );  if ( $repeatable_fields ) : ?>

```
    	<div class="list">
```

    		<?php foreach ( $repeatable_fields as $field ) { ?>

```
    			<div class="row">
```

    				<?php if( $field['name'] != '' ) echo '<span class="field">'. esc_attr( $field['name'] ) . '</span>'; ?>

    				<?php if( $field['url'] != '' ) echo '<span class="field">'. esc_attr( $field['url'] ) . '</span>'; ?>

```
    			</div>
```
```
    		<?php } ?>
```
```
    	</div>
```
```
    <?php endif; ?>
```

section

代码二

在上面的基础上，附加了下拉选项字段。

```
    function hhs_get_sample_options() {
```
```
    	$options = array (
```
```
    		'Option 1' => 'option1',
```
```
    		'Option 2' => 'option2',
```
```
    		'Option 3' => 'option3',
```
```
    		'Option 4' => 'option4',
```
```
    	);
```
```
 
```
```
    	return $options;
```
```
    }
```
```
 
```

    add_action('admin_init', 'hhs_add_meta_boxes', 1);

```
    function hhs_add_meta_boxes() {
```

    	add_meta_box( 'repeatable-fields', 'Repeatable Fields', 'hhs_repeatable_meta_box_display', 'post', 'normal', 'default');

```
    }
```
```
 
```

    function hhs_repeatable_meta_box_display() {

```
    	global $post;
```
```
 
```

    	$repeatable_fields = get_post_meta($post->ID, 'repeatable_fields', true);

    	$options = hhs_get_sample_options();

```
 
```

    	wp_nonce_field( 'hhs_repeatable_meta_box_nonce', 'hhs_repeatable_meta_box_nonce' );

```
    	?>
```
```
    	<script type="text/javascript">
```

    	jQuery(document).ready(function( $ ){

    		$( '#add-row' ).on('click', function() {

    			var row = $( '.empty-row.screen-reader-text' ).clone(true);

    			row.removeClass( 'empty-row screen-reader-text' );

    			row.insertBefore( '#repeatable-fieldset-one tbody>tr:last' );

```
    			return false;
```
```
    		});
```
```
 
```

    		$( '.remove-row' ).on('click', function() {

```
    			$(this).parents('tr').remove();
```
```
    			return false;
```
```
    		});
```
```
    	});
```
```
    	</script>
```
```
 
```

    	<table id="repeatable-fieldset-one" width="100%">

```
    	<thead>
```
```
    		<tr>
```
```
    			<th width="40%">Name</th>
```
```
    			<th width="12%">Select</th>
```
```
    			<th width="40%">URL</th>
```
```
    			<th width="8%"></th>
```
```
    		</tr>
```
```
    	</thead>
```
```
    	<tbody>
```
```
    	<?php
```
```
 
```
```
    	if ( $repeatable_fields ) :
```
```
 
```

    	foreach ( $repeatable_fields as $field ) {

```
    	?>
```
```
    	<tr>
```

    		<td><input type="text" class="widefat" name="name[]" value="<?php if($field['name'] != '') echo esc_attr( $field['name'] ); ?>" /></td>

```
 
```
```
    		<td>
```
```
    			<select name="select[]">
```

    			<?php foreach ( $options as $label => $value ) : ?>

    			<option value="<?php echo $value; ?>"<?php selected( $field['select'], $value ); ?>><?php echo $label; ?></option>

```
    			<?php endforeach; ?>
```
```
    			</select>
```
```
    		</td>
```
```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="<?php if ($field['url'] != '') echo esc_attr( $field['url'] ); else echo 'http://'; ?>" /></td>

```
 
```

    		<td><a class="button remove-row" href="#">Remove</a></td>

```
    	</tr>
```
```
    	<?php
```
```
    	}
```
```
    	else :
```
```
    	// show a blank one
```
```
    	?>
```
```
    	<tr>
```

    		<td><input type="text" class="widefat" name="name[]" /></td>

```
 
```
```
    		<td>
```
```
    			<select name="select[]">
```

    			<?php foreach ( $options as $label => $value ) : ?>

    			<option value="<?php echo $value; ?>"><?php echo $label; ?></option>

```
    			<?php endforeach; ?>
```
```
    			</select>
```
```
    		</td>
```
```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="http://" /></td>

```
 
```

    		<td><a class="button remove-row" href="#">Remove</a></td>

```
    	</tr>
```
```
    	<?php endif; ?>
```
```
 
```

    	<!-- empty hidden one for jQuery -->

    	<tr class="empty-row screen-reader-text">

    		<td><input type="text" class="widefat" name="name[]" /></td>

```
 
```
```
    		<td>
```
```
    			<select name="select[]">
```

    			<?php foreach ( $options as $label => $value ) : ?>

    			<option value="<?php echo $value; ?>"><?php echo $label; ?></option>

```
    			<?php endforeach; ?>
```
```
    			</select>
```
```
    		</td>
```
```
 
```

    		<td><input type="text" class="widefat" name="url[]" value="http://" /></td>

```
 
```

    		<td><a class="button remove-row" href="#">Remove</a></td>

```
    	</tr>
```
```
    	</tbody>
```
```
    	</table>
```
```
 
```

    	<p><a id="add-row" class="button" href="#">Add another</a></p>

```
    	<?php
```
```
    }
```
```
 
```

    add_action('save_post', 'hhs_repeatable_meta_box_save');

    function hhs_repeatable_meta_box_save($post_id) {

    	if ( ! isset( $_POST['hhs_repeatable_meta_box_nonce'] ) ||

    	! wp_verify_nonce( $_POST['hhs_repeatable_meta_box_nonce'], 'hhs_repeatable_meta_box_nonce' ) )

```
    		return;
```
```
 
```

    	if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)

```
    		return;
```
```
 
```

    	if (!current_user_can('edit_post', $post_id))

```
    		return;
```
```
 
```

    	$old = get_post_meta($post_id, 'repeatable_fields', true);

```
    	$new = array();
```

    	$options = hhs_get_sample_options();

```
 
```
```
    	$names = $_POST['name'];
```
```
    	$selects = $_POST['select'];
```
```
    	$urls = $_POST['url'];
```
```
 
```
```
    	$count = count( $names );
```
```
 
```

    	for ( $i = 0; $i < $count; $i++ ) {

```
    		if ( $names[$i] != '' ) :
```

    			$new[$i]['name'] = stripslashes( strip_tags( $names[$i] ) );

```
 
```

    			if ( in_array( $selects[$i], $options ) )

    				$new[$i]['select'] = $selects[$i];

```
    			else
```
```
    				$new[$i]['select'] = '';
```
```
 
```
```
    			if ( $urls[$i] == 'http://' )
```
```
    				$new[$i]['url'] = '';
```
```
    			else
```

    				$new[$i]['url'] = stripslashes( $urls[$i] ); // and however you want to sanitize

```
    		endif;
```
```
    	}
```
```
 
```

    	if ( !empty( $new ) && $new != $old )

    		update_post_meta( $post_id, 'repeatable_fields', $new );

```
    	elseif ( empty($new) && $old )
```

    		delete_post_meta( $post_id, 'repeatable_fields', $old );

```
    }
```

前端调用

    <?php $repeatable_fields = get_post_meta( $post->ID, 'repeatable_fields', true );  if ( $repeatable_fields ) : ?>

```
    	<div class="list">
```

    		<?php foreach ( $repeatable_fields as $field ) { ?>

```
    			<div class="row">
```

    				<?php if( $field['name'] != '' ) echo '<span class="field">'. esc_attr( $field['name'] ) . '</span>'; ?>

    				<?php if( $field['select'] != '' ) echo '<span class="field">'. esc_attr( $field['select'] ) . '</span>'; ?>

    				<?php if( $field['url'] != '' ) echo '<span class="field">'. esc_attr( $field['url'] ) . '</span>'; ?>

```
    			</div>
```
```
    		<?php } ?>
```
```
    	</div>
```
```
    <?php endif; ?>
```

WordPress 添加可重复使用的自定义 metabox 字段

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WordPress 添加可重复使用的自定义metabox 字段

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代码二

WordPress 添加可重复使用的自定义 metabox 字段

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