[Resolved] Elementor Form Validation Error on Translated Pages (WPML Conflict Suspected)

Hello,

please add next code to your functions.php and try again:

add_action( 'wp_ajax_elementor_pro_forms_send_form', 'wssupp_set_language_ajax_form', 9 );
add_action( 'wp_ajax_nopriv_elementor_pro_forms_send_form', 'wssupp_set_language_ajax_form', 9 );
function wssupp_set_language_ajax_form(){

	$id = $_POST['post_id'];
	$post = get_post($id);
	
	$lang = apply_filters( 'wpml_element_language_code', NULL, ['element_id' => $id, 'element_type' => $post->post_type] );

	$current_language = apply_filters('wpml_current_language', NULL );

	if ( $lang != $current_language ) {
		do_action( 'wpml_switch_language', $lang );
	}
}

It seems to a bug from our side and we will escalate developers for permanent fix.

Regards,
Drazen

It works with the correct code.

The code contains a potential problem: it does not check whether $_POST[“post_id”] exists before accessing it, which can lead to a PHP error if the key is missing. In addition, the function should ensure that the inputs are validated to avoid security vulnerabilities. Here is the corrected and improved code:

add_action( “wp_ajax_elementor_pro_forms_send_form”, “wssupp_set_language_ajax_form”, 9 );
add_action( “wp_ajax_nopriv_elementor_pro_forms_send_form”, “wssupp_set_language_ajax_form”, 9 );

function wssupp_set_language_ajax_form() {
// Check if post_id is set and is a number
if ( ! isset( $_POST[“post_id”] ) || ! is_numeric( $_POST[“post_id”] ) ) {
wp_send_json_error( “Invalid or missing post ID” );
return;
}

$id = (int) $_POST[“post_id”];
$post = get_post( $id );

// Check if the post exists
if ( ! $post ) {
wp_send_json_error( “Post not found” );
return;
}

$lang = apply_filters( “wpml_element_language_code”, null, [“element_id” => $id, “element_type” => $post->post_type] );
$current_language = apply_filters( “wpml_current_language”, null );

if ( $lang && $lang !== $current_language ) {
do_action( “wpml_switch_language”, $lang );
}

// Optional: success message or additional code
}

Changes and improvements:
Checking $_POST[“post_id”]:
A check is performed to ensure that post_id exists and is a number in order to avoid errors.

If the condition is not met, an error message is returned.

Type conversion:
$id is converted to an integer with (int) to ensure that it is a valid ID.

Checking the post:
A check is performed to ensure that get_post($id) returns a post to avoid errors with invalid IDs.

Checking $lang:
It is checked whether $lang has a value before the language change is carried out to avoid unnecessary actions.

Security aspect:
Validating $_POST[“post_id”] and type conversion reduces the risk of security issues such as SQL injection or unexpected behaviour.

Error handling:
wp_send_json_error is used to provide proper feedback to AJAX requests in case of errors.

Notes:
The code assumes that the WPML plugin is active, as it uses the wpml_element_language_code and wpml_current_language filters.

If the function is used in an AJAX context, it may be useful to add a success message with wp_send_json_success if the language switch was successful.

Make sure that the action elementor_pro_forms_send_form is correct and used by the Elementor Pro form.