L'idée de base est que pour tout article sur le site, j'aimerais que les utilisateurs soient en mesure de lui attribuer une catégorie en sélectionnant parmi un ensemble de cases à cocher sur le front-office. Ce serait une sorte de catégorisation du contenu en provenance de la foule.
Des idées sur la meilleure façon d'aborder cela?
Je voulais vous donner quelques idées, mais une fois que j'ai commencé, je ne pouvais plus m'en empêcher et j'ai écrit ce petit plugin avec un nom obscur pour vous aider à démarrer.
<?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
?>