added login failed message

js/qsm-quiz.js

@@ -1617,6 +1617,35 @@ jQuery(function () {
 		}, 2000);
 	});
 
+	jQuery(document).on('submit', 'form[name="qsm-login-form"]', function (e) {
+		e.preventDefault();
+
+		let form = jQuery(this);
+		let username = form.find('input[name="log"]').val();
+		let password = form.find('input[name="pwd"]').val();
+		form.find('input[type="submit"]').attr('disabled', true);
+		jQuery(".qsm-login-form-warning").remove();
+
+		// Make a request to the WordPress REST API to log in
+		jQuery.ajax({
+			url: qmn_ajax_object.ajaxurl,
+			method: 'POST',
+			data: {
+                action: 'qsm_ajax_login',
+                username: username,
+                password: password,
+            },
+			success: function (response) {
+                if ( response.success ) {
+                    form.get(0).submit();
+				} else {
+                    form.append('<div class="qsm-result-page-warning qsm-login-form-warning">' + response.data.message + '</div>');
+					form.find('input[type="submit"]').attr('disabled', false);
+				}
+            }
+		});
+	});
+
 	//inline result status function
 	function qsm_show_inline_result(quizID, question_id, value, $this, answer_type, $i_this, index = null) {
 		jQuery('.qsm-spinner-loader').remove();

php/classes/class-qmn-quiz-manager.php

@@ -86,6 +86,33 @@ public function add_hooks() {
 		add_action( 'wp_ajax_nopriv_qsm_remove_file_fd_question', array( $this, 'qsm_remove_file_fd_question' ) );
 
 		add_action( 'init', array( $this, 'qsm_process_background_email' ) );
+		add_action('wp_ajax_nopriv_qsm_ajax_login', array( $this, 'qsm_ajax_login' ) );
+
+	}
+
+	/**
+	 * @version 8.2.0
+	 * ajax login function
+	 */
+	public function qsm_ajax_login() {
+		$username = ! empty( $_POST['username'] ) ? sanitize_user( wp_unslash( $_POST['username'] ) ) : '';
+		$password = ! empty( $_POST['password'] ) ? sanitize_text_field( wp_unslash( $_POST['password'] ) ) : '';
+
+		$user = get_user_by('login', $username);
+
+		if ( ! $user ) {
+			wp_send_json_error( array( 'message' => __( 'User not found! Please try again.', 'quiz-master-next' ) ) );
+		}
+
+		$user_id = $user->ID;
+
+		// Check the password
+		if ( ! wp_check_password( $password, $user->user_pass, $user_id ) ) {
+			wp_send_json_error( array( 'message' => __( 'Incorrect username or password! Please try again.', 'quiz-master-next' ) ) );
+		}else {
+			wp_send_json_success();
+		}
+
 	}
 
 	/**
@@ -898,6 +925,7 @@ public function display_quiz( $options, $quiz_data, $question_amount, $shortcode
 			'qsm_quiz',
 			'qmn_ajax_object',
 			array(
+				'site_url'                  => site_url(),
 				'ajaxurl'                   => admin_url( 'admin-ajax.php' ),
 				'multicheckbox_limit_reach' => $mlwQuizMasterNext->pluginHelper->qsm_language_support( $options->quiz_limit_choice, "quiz_quiz_limit_choice-{$options->quiz_id}" ),
 				'out_of_text'               => __( ' out of ', 'quiz-master-next' ),
@@ -2744,7 +2772,10 @@ function qmn_require_login_check( $display, $qmn_quiz_options, $qmn_array_for_va
 		$mlw_message = str_replace( "\n", '<br>', $mlw_message );
 		// $display .= do_shortcode($mlw_message);
 		$display .= do_shortcode( $mlw_message );
-		$display .= wp_login_form( array( 'echo' => false ) );
+		$display .= wp_login_form( array(
+			'echo'    => false,
+			'form_id' => 'qsm-login-form',
+		) );
 	}
 	return $display;
 }