使用comment_form()自定义WordPress评论表单

WordPress 的 comment_form() 函数可以用来来构建评论表单，下面简单讲解一下 comment_form() 的使用方法，希望能帮助大家自定义评论表单。

调用 comment_form()

如果你要在主题中调用评论表单，只需要在使用下面简单的代码即可：

<?php comment_form(); ?>

就像wordpress官方的主题 twentyfourteen 的 comments.php 文件的倒数第2行看到一样：

<?php
/**
 * The template for displaying Comments
 *
 * The area of the page that contains comments and the comment form.
 *
 * @package WordPress
 * @subpackage Twenty_Fourteen
 * @since Twenty Fourteen 1.0
 */
/*
 * If the current post is protected by a password and the visitor has not yet
 * entered the password we will return early without loading the comments.
 */
if ( post_password_required() ) {
	return;
}
?>
<div id="comments" class="comments-area">
	<?php if ( have_comments() ) : ?>
	<h2 class="comments-title">
		<?php
			printf( _n( 'One thought on “%2$s”', '%1$s thoughts on “%2$s”', get_comments_number(), 'twentyfourteen' ),
				number_format_i18n( get_comments_number() ), get_the_title() );
		?>
	</h2>
	<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : ?>
	<nav id="comment-nav-above" class="navigation comment-navigation" role="navigation">
		<h1 class="screen-reader-text"><?php _e( 'Comment navigation', 'twentyfourteen' ); ?></h1>
		<div class="nav-previous"><?php previous_comments_link( __( '← Older Comments', 'twentyfourteen' ) ); ?></div>
		<div class="nav-next"><?php next_comments_link( __( 'Newer Comments →', 'twentyfourteen' ) ); ?></div>
	</nav><!-- #comment-nav-above -->
	<?php endif; // Check for comment navigation. ?>
	<ol class="comment-list">
		<?php
			wp_list_comments( array(
				'style'      => 'ol',
				'short_ping' => true,
				'avatar_size'=> 34,
			) );
		?>
	</ol><!-- .comment-list -->
	<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : ?>
	<nav id="comment-nav-below" class="navigation comment-navigation" role="navigation">
		<h1 class="screen-reader-text"><?php _e( 'Comment navigation', 'twentyfourteen' ); ?></h1>
		<div class="nav-previous"><?php previous_comments_link( __( '← Older Comments', 'twentyfourteen' ) ); ?></div>
		<div class="nav-next"><?php next_comments_link( __( 'Newer Comments →', 'twentyfourteen' ) ); ?></div>
	</nav><!-- #comment-nav-below -->
	<?php endif; // Check for comment navigation. ?>
	<?php if ( ! comments_open() ) : ?>
	<p class="no-comments"><?php _e( 'Comments are closed.', 'twentyfourteen' ); ?></p>
	<?php endif; ?>
	<?php endif; // have_comments() ?>
	<?php comment_form(); ?>
</div><!-- #comments -->

comment_form() 参数

<?php comment_form($args, $post_id); ?>

• $args：comment_form() 的输出配置参数，为一个关联数组，配置项非常丰富，下面我们会详细说明。
• $post_id：文章id，默认为空，即当前id
• $args的默认配置：

$defaults = array(
        'fields'               => apply_filters( 'comment_form_default_fields', $fields ),
        'comment_field'        => '<p class="comment-form-comment"><label for="comment">' . _x( 'Comment', 'noun' ) . '</label><textarea id="comment" name="comment" cols="45" rows="8" aria-required="true"></textarea></p>',
        'must_log_in'          => '<p class="must-log-in">' .  sprintf( __( 'You must be <a href="%s">logged in</a> to post a comment.' ), wp_login_url( apply_filters( 'the_permalink', get_permalink( $post_id ) ) ) ) . '</p>',
        'logged_in_as'         => '<p class="logged-in-as">' . sprintf( __( 'Logged in as <a href="%1$s">%2$s</a>. <a href="%3$s" title="Log out of this account">Log out?</a>' ), admin_url( 'profile.php' ), $user_identity, wp_logout_url( apply_filters( 'the_permalink', get_permalink( $post_id ) ) ) ) . '</p>',
        'comment_notes_before' => '<p class="comment-notes">' . __( 'Your email address will not be published.' ) . ( $req ? $required_text : '' ) . '</p>',
        'comment_notes_after'  => '<p class="form-allowed-tags">' . sprintf( __( 'You may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: %s' ), ' <code>' . allowed_tags() . '</code>' ) . '</p>',
        'id_form'              => 'commentform',
        'id_submit'            => 'submit',
        'title_reply'          => __( 'Leave a Reply' ),
        'title_reply_to'       => __( 'Leave a Reply to %s' ),
        'cancel_reply_link'    => __( 'Cancel reply' ),
        'label_submit'         => __( 'Post Comment' ),
    );

自定义评论表单

删除表单字段

如果我们想要删除网址字段，只需要打开主题的 functions.php 文件，添加以下代码：

add_filter('comment_form_default_fields', 'mytheme_remove_url');
 
function mytheme_remove_url($arg) {
    $arg['url'] = '';
    return $arg;
}

保存后刷新页面，你就会看到“url”输入框已经不存在了。

新增表单字段

假设我们要添加一个 QQ 字段，同样在主题的 functions.php 添加下面的代码即可：

function my_fields($fields) {
	$fields['qq'] = '<p class="comment-form-qq">' . '<label for="qq">'.__('QQ').'</label> ' .
	'<input id="qq" name="qq" type="text" value="' . esc_attr( $commenter['comment_qq'] ) . '" size="30" /></p>';
	return $fields;
}
add_filter('comment_form_default_fields','my_fields');

刷新页面，即可看到新增的表单。

comment_form() 钩子

评论表单同时还带了不少钩子，让你可以在喜欢的位置添加你想要的内容，具体钩子如下：

• comment_form_before
• comment_form_must_log_in_after
• comment_form_top
• comment_form_logged_in_after
• comment_notes_before
• comment_form_before_fields
• comment_form_field_{$name}
• comment_form_after_fields
• comment_form_field_comment
• comment_form (action hook)
• comment_form_after
• comment_form_comments_closed

更多信息，请参考官方文档：http://codex.wordpress.org/Function_Reference/comment_form