I created custom post type Testimonials and made the title required using the code in this link:

Require title for pages

Now I applied the code in order to make the content required, and it works fine.

Just when I click Publish button and editor is empty, an alert message appears at the top of the screen that the content is required.

But here is the problem: when I enter some content and click Publish button, the alert message displayed again.

Here is the used code:

function force_testimonials_post_content_init() {

function force_testimonials_post_content() {
    if ( get_post_type( get_the_ID() ) == 'testimonials' ) {
        echo "<script type='text/javascript'>\n";
        echo "
        jQuery('#publish').click(function() {
            var contentvar = jQuery('[id^=\"postdivrich\"]')
            if (contentvar.val().length < 1) {
                jQuery('[id^=\"postdivrich\"]').css('background', '#fff3cd');

                setTimeout(\"jQuery('#ajax-loading').css('visibility', 'hidden');\", 100);


                setTimeout(\"jQuery('#publish').removeClass('button-primary-disabled');\", 100);
                return false;
        echo "</script>\n";
add_action('admin_init', 'force_testimonials_post_content_init');
add_action('edit_form_advanced', 'force_testimonials_post_content');
 // Add this row below to get the same functionality for page creations.
add_action('edit_page_form', 'force_testimonials_post_content');

1 Answer 1


the content_save_pre filter. It checks the post type of the current post and ensures that the content field is not empty. If the content field is empty, the function calls wp_die() to display an error message and stop the post from being saved.

Note: Make sure to replace "custom_post_type" with the actual name of your custom post type. Also, you can modify the error message to fit your needs.

add_filter( 'content_save_pre', 'validate_custom_post_type_content' );
function validate_custom_post_type_content( $content ) {
    global $post;
    if ( 'custom_post_type' === $post->post_type && empty( $content ) ) {
        wp_die( __( 'The content field is required for this custom post type. Please enter some content and try again.' ) );
    return $content;
  • useful answer , this code working fine , but there is a warning appear in top of screen says: Warning: Attempt to read property "post_type" on null in E:\xampp\htdocs\repo\wp-content\plugins\consulty-core\custom-posts\testimonials\testimonials.php on line 285 , consulty-core is a plugin I created for this theme includes custom posts and custom widget. @vijay-rathod Feb 6, 2023 at 11:12
  • the warning line appear when open "add new testimonials" screen , then disappear after publish post Feb 6, 2023 at 11:27

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