基本的な考え方は、サイト上のすべての投稿に対するものです。フロントエンドのチェックボックスのセットから選択することで、ユーザーにカテゴリの割り当てを許可したいと思います。これは、クラウドソーシングによるコンテンツの分類の一種です。
これに近づくための最良の方法についてのアイデアはありますか?
私はあなたにいくつかのアイデアを提供したいと思いましたが、私が始めたら私は自分自身を止めることができず、あなたを始めるためにあいまいな名前でこの小さなプラグインを書きました。
<?php
/*
Plugin Name: WPSE Crowded Cats
Plugin URI: http://wordpress.stackexchange.com/questions/43419/how-do-i-create-a-way-for-users-to-assign-categories-to-a-post-from-the-frontend
Description: Allow visitors to change categories of posts. Ready to use with custom taxonomies and post types.
Version: 0.1
Author: WPSE
Author URI: http://wordpress.stackexchange.com/users/2110/maugly
License: GPL2
*/
add_action('plugins_loaded','wpse_init_crowd_cats_class');
function wpse_init_crowd_cats_class(){
new WPSECrowdCatsClass();
}
class WPSECrowdCatsClass {
function __construct() {
// APPEND THE FORM AUTOMATICALLY TO EVERY POST
add_filter( 'the_content', array( $this,'append_form' ) );
// TEMPLATE ACTION TAG TO BE USED IN THEME
// Usage: do_action('wpse_crowd_cats_form');
// Usage: do_action('wpse_crowd_cats_form', $post_id, $taxonomy );
add_action( 'wpse_crowd_cats_form', array( $this,'wpse_crowd_cats_form' ), 10, 2 );
// FORM PROCESSING
add_action( 'template_redirect', array( $this,'process_request' ) );
}
function process_request(){
// check submission
if ( ! isset($_POST['crowd-cat-radio']) || ! is_array($_POST['crowd-cat-radio']) )
return;
//TODO: check nonce
// sanitize and check the input
$suggested_terms = array_map( 'absint', $_POST['crowd-cat-radio'] );
$post_id = absint( $_POST['crowd-cats-pid'] );
$tax = $_POST['crowd-cats-tax'];
if ( ! taxonomy_exists($tax) )
return;
// Allow only existing terms. Not sure if this is needed.
$args = array( 'hide_empty' => false );
$args = apply_filters( 'mcc_allowed_terms_args', $args, $post_id, $tax );
$args['fields'] = 'ids';
$allowed_terms = get_terms( $tax, $args );
foreach ( $suggested_terms as $key => $term_id )
if ( ! in_array( $term_id, $allowed_terms ) )
unset( $suggested_terms[$key] );
// Add terms to taxonomy
$affected_terms = wp_set_object_terms( $post_id, $suggested_terms, $tax, false );
update_term_cache($affected_terms);
return $affected_terms;
}
function get_form( $post_id=null, $tax='category' ) {
if ( is_null($post_id) || ! taxonomy_exists($tax) )
return false;
$args = array( 'hide_empty' => false );
$args = apply_filters( 'mcc_get_terms_args', $args, $post_id, $tax );
$all_terms = get_terms( $tax, $args );
if ( ! $all_terms )
return false;
$post_terms = wp_get_object_terms( $post_id, $tax, array( 'fields' => 'ids' ) );
$permalink = get_permalink( $post_id );
$out = "<form id='crowd-cats' action='$permalink' method='POST' >
<ul >";
foreach ( $all_terms as $t ) :
$checked = in_array( $t->term_id, $post_terms) ? 'checked' : '';
$out .= "<li>
<input type='checkbox' id='crowd-cat-$t->term_id' name='crowd-cat-radio[]' value='$t->term_id' $checked />
<label for='crowd-cat-$t->term_id' >".esc_attr($t->name)."</label>
</li>";
endforeach;
$out .= "</ul>
<input type='submit' value='Submit' name='crowd-cats-submit'/>
<input type='hidden' value='".esc_attr($tax)."' name='crowd-cats-tax'/>
<input type='hidden' value='$post_id' name='crowd-cats-pid'/>";
//TODO: set nonce
$out .= "</form>";
return $out;
}
function append_form($content){
global $post;
if ( 'post' != $post->post_type )
return $content;
$form = $this->get_form( $post->ID );
if ( ! $form )
return $content;
return "$content \n $form";
}
function wpse_crowd_cats_form( $post_id=null, $taxonomy='category' ) {
if ( is_null($post_id) ) {
global $post;
$post_id = $post->ID;
}
echo $this->get_form( $post_id, $taxonomy );
}
} // end of class
?>