Disallow Same Post Title

2 Views

I am looking for some code where member can’t use the same title as another post already having or used.

e.g if there is a post with title “Amazing Australia Tour” than it should not allow to use the same title to same or other user.

Post Views: 2

Related posts

Leave a Reply

2 comments

  1. Main Code

    Please check the auxiliary code after this block

    /*
 * Prevent Duplicated Titles
 *
 */

if( is_admin() ) // check if we are in the administrative area
{
    add_action( 'save_post', 'wpse_54258_check_for_duplicate_title', 11, 2 );
    add_action( 'admin_head-post.php', 'wpse_54258_check_for_notice' );
}

/*
 * Checks for more than one post with the same title
 *
 * Adds filter redirect_post_location if duplicate title found
 *
 */

function wpse_54258_check_for_duplicate_title( $post_id, $post )
{
    // HERE, FURTHER FILTERING CAN BE DONE, RESTRICT USERS, POST_TYPES, ETC
    if ( 
        ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
        or ! current_user_can( 'edit_post', $post_id )
        or wp_is_post_revision( $post )
        // ADD OTHER FILTERS, LIKE post_type
    )
    { // Noting to do.
        return;
    }

    $termid = get_post_meta($post_id, '_is_dup', true);
    if ( '' != $termid ) 
    {
        // it's a new record
        $count_dups = 0;
        update_post_meta($post_id, '_is_dup', 'new-post-check');
    } 
    else 
    {
        $count_dups = 1;
    }
    
    // NO CHECKING IS BEING DONE REGARDING UPPER AND LOWERCASES, NOR FOR HTML TAGS
    global $wpdb;
    $title_exists = $wpdb->get_results( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_title = '$post->post_title' AND post_status = 'publish'") );

    if( count($title_exists) > $count_dups ) 
        add_filter('redirect_post_location','wpse_54258_add_error_query_var');
}


/*
 * Removes the previous applied filter and adds error var to the redirect
 *
 */

function wpse_54258_add_error_query_var( $loc ) 
{
    remove_filter( 'redirect_post_location','wpse_54258_add_error_query_var' );
    return add_query_arg( 'duplicated_title', 123, $loc );
}


/*
 * Error checking after saving the post
 *
 */

function wpse_54258_check_for_notice()
{
    if( isset( $_GET['duplicated_title'] ) )
        add_action( 'admin_notices', 'wpse_54258_display_error_message' );
}

/*
 * Actual error message for duplicated post titles
 *
 */
function wpse_54258_display_error_message()
{ ?>
    <div class="error fade">ERROR</div>
    <?php
    remove_action( 'admin_notices', 'wpse_54258_display_error_message' );
}

    Auxiliary Code

    The method used to check if a new post/page is being created or not requires a post_meta that has to be applied to all previous posts/pages.

    /*
 * Update ALL PUBLISHED posts and pages with the controller post_meta required by the main code
 *
 * Important: Run Only Once 
 * -> Paste in functions.php
 * -> Remove the comment to add_action
 * -> Visit any administrative page
 * -> Delete or disable this code
 * 
 */
//add_action('admin_init','wpse_54258_run_only_once');
function wpse_54258_run_only_once()
{   
    global $wpdb;
    $allposts = $wpdb->get_results( "SELECT ID FROM $wpdb->posts WHERE post_status = 'published'" );
    foreach( $allposts as $pt )
    {
        update_post_meta( $pt->ID, '_is_dup', 'new-post-check');
    }
}

    This answer was assembled using:

  2. I’ve been able to prevent same post Titles with Ajax. Here’s what I did:

    on functions.php

    // 1. Enqueue my admin script
function add_my_admin_script(){
    wp_enqueue_script('admin_script', get_template_directory_uri() . '/js/admin_script.js', array('jquery'));
    //
    wp_localize_script( 'admin_script', 'ajax_object',
        array( 'ajax_url' => admin_url( 'admin-ajax.php' ), 'we_value' => 1234 ) );
}
add_action('admin_enqueue_scripts', 'add_my_admin_script');   

// 2. The Function to check Post Titles
/************/
// Check Titles
/************/
add_action( 'wp_ajax_my_action', 'my_action_callback' );

function my_action_callback() {
    global $wpdb;
    $title_exists = $wpdb->get_results( 
        "
        SELECT ID
        FROM $wpdb->posts
        WHERE  
            post_title LIKE '" . $_POST['this_convidado_title'] . "'
        AND
            post_type = '" . $_POST['post_type'] .  "'    
        "
    );
    if($_POST['post_ID'] != ""){
        foreach ($title_exists as $key => $this_id) {
            if($_POST['post_ID'] == $this_id->ID){
                $this_is_the_post = $this_id->ID;
            }
        }
    }
    if($this_is_the_post){
        echo (count($title_exists)-1);
    } else {
        echo count($title_exists);
    }
    die();
}

    on my admin_script.js

    jQuery(document).ready(function($) {
    "use strict";
    $( "#title" ).change(function() {
        if($(this).val() !== ""){
            var this_post_id;
            this_post_id = "";
            if($("#post_ID").val()){
                this_post_id = $("#post_ID").val();
            }
            var data = {
                'action': 'my_action',
                'this_convidado_title': $(this).val(),
                'post_type': 'your_post_type',
                'post_ID' : this_post_id
            };
            // We can also pass the url value separately from ajaxurl for front end AJAX implementations
            jQuery.post(ajax_object.ajax_url, data, function(response) {
                if(response > 0){
                    alert('There is a post with this same Title!');
                    $("#title").val("");
                    $("#post").submit();
                    // I do the form#post submission because I could not find the trigger to use the autosave - would be better with the auto save
                    // This is needed to avoid save post drafts with the unwanted title
                }
            });
        }
    });
});