Canot save post if any meta box was empty

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The easiest solution is to use jQuery. Add the below code to any JS file that you include in the admin area.

As you haven’t given very much information above I don’t know a couple of things, so you’ll need to amend this example slightly –

  • Change your-post-type to the slug of the post type for which this metabox exists. If it’s the default Post then it’ll just be post.

  • Change '#field-name' to the correct ID of your field. To find this out, check the source of your page.

The code –

jQuery(document).ready(function($){

    var post_type = $('#post_type').val();      

    if(post_type === 'your-post-type'){

        $('input#publish').on('click', function(e){

            var myVal = $('#field-name').val();

            if(yourMetaField === ''){
                e.preventDefault();
                alert('You must fill all meta box value before save post');
            }

        });

    }

});