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I'm pretty new at js programming. I'm developing an admission form as part of our project to be submitted. It's also my first time asking a question here.
I'm creating a form of validation to prevent any invalid values to be entered. I also need some optimizations at my code. If you have any suggestions to make it shorter, I'll be glad to accept your suggestion too.
I tried executing the matchCheck() function on other scenarios, but it just works fine. I also tried executing validateDate() on the console and other scenarios, but it also worked without any errors. I got an error when the functions are executed at if statements.
Here is the error message:
Unknown TypeError: arrayToBeChecked.includes is not a function
I got an error at these function and if statements:
function matchCheck(arrayToBeChecked, findingValue) {
return arrayToBeChecked.includes(findingValue);
if (matchCheck(date[0], "null") === false)
if (validateDate(bdate) === true)
Here is the code (Excluded some of the unrelated variables and codes):
//Check Match
function matchCheck(arrayToBeChecked, findingValue) {
return arrayToBeChecked.includes(findingValue);
//Date Validator
//Expected Format [MM/DD/YYYY]
function validateDate(date) {
//check if the date is valid
var leapYear = date[2] % 4;
var mos31 = ["1", "3", "5", "7", "8", "10", "12"];
var mos30 = ["4", "6", "9", "11"];
var flyInv = ["30", "31"];
var fnlyInv = ["29", "30", "31"];
var mos30Inv = "31";
if (matchCheck(date[0], "null") === false) {
if (matchCheck(date[1], "null") === false) {
if (matchCheck(date[2], "null") === false) {
if (leapYear == 0) {
if (date[0] == "2") {
if (matchCheck(flyInv, date[1]) === false) {
return true;
else {
return false;
else if (matchCheck(mos31, date[0]) === true) {
return true;
else if (matchCheck(mos30, date[0]) === true) {
if (matchCheck(mos30Inv, date[1]) === false) {
return true;
else {
return false;
else {
return false
else {
if (date[0] == "2") {
if (matchCheck(fnlyInv, date[1]) === false) {
return true;
else {
return false;
else if (matchCheck(mos31, date[0]) === true) {
return true;
else if (matchCheck(mos30, date[0]) === true) {
if (matchCheck(mos30Inv, date[1]) === false) {
return true;
else {
return false;
else {
return false;
else {
return false;
else {
return false;
else {
return false;
//Contact Number Validator
//Expected Format [09XXXXXXXXX]
function cnValid(nos) {
if (nos.value.length === 11) {
if(nos.indexOf("09") > -1) {
return true;
else {
return false;
else {
return false;
//Check for empty selects
function checkEmptySelects(el) {
var selects = document.querySelectorAll(el);
var i;
for (i = 0; i < selects.length; i++) {
if (selects[i].value == "0") {
return true;
else {
return false;
//Valid Relation Values
var vrv = ["mother", "father", "grandmother", "grandfather", "auntie", "uncle", "housemaid", "Mother", "Father", "Grandmother", "Grandfather", "Auntie", "Uncle", "Housemaid", "Aunt", "aunt", "brother", "Brother", "sister", "Sister", "cousin", "Cousin"];
//Start Review
function reviewForm() {
var letters = /^[a-zA-Z\s]*$/;
var mailFormat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
var noScFormat = /[^a-zA-Z0-9\\,\\.\s]/g;
//Perform Checks
if (checkEmptySelects("select") === false) {
if (ln.value.match(letters)) {
if (fn.value.match(letters)) {
if (mn.value.match(letters)) {
if (eml.value.match(mailFormat)) {
if (age.value >= 0) {
if (age.value <= 100) {
if (validateDate(bdate) === true) {
if (pob.value.match(noScFormat)) {
if (ca.value.match(noScFormat)) {
if (rlg.value.match(letters)) {
if (nsl.value.match(letters)) {
if (cmn.value.match(letters)) {
if (mo.value.match(letters)) {
if (cfn.value.match(letters)) {
if (fo.value.match(letters)) {
if (gn.value.match(letters)) {
if (matchCheck(vrv, rts) === true) {
if (cnValid(cn) === true) {
if (lrn.value.length === 12) {
//Submit Data to db if all of the requirements are passed.
else {
//Error Message;
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
else {
//Error Message
–
–
function matchCheck(arrayToBeChecked, findingValue) {
// Convert arrayToBeChecked to an array if it's not already an array
if (!Array.isArray(arrayToBeChecked)) {
arrayToBeChecked = [arrayToBeChecked];
return arrayToBeChecked.includes(findingValue);
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