Develop Reference

JavaScript can not get alert box

So basically, I'm trying to do client side validation through JavaScript, but the code does not seem to be working. I am not getting any alert box. Below is HTML Form and JavaScript. I have skipped html and Body tags for obvious reasons. Can someone look over and see where am I making a mistake?
HTML form
<div class="container" >
<h1 style="text-align: center;">Online Vaccine Registration Form</h1>
<h1 style="text-align: center;">Developed by yourname</h1>
<form method="post" name="vacform" onsubmit=" return validateForm()">
<table>
<div class="row">
<div class="form-group col-md-6">
<label for="Name">Name : </label>
<input type="text" class="form-control" name="name" placeholder="Name">
</div>
<div class="form-group col-md-6">
<label for="CNIC" >CNIC : </label>
<input type="text" class="form-control" name="CNIC" placeholder="CNIC">
</div>
</div>
<div class="row">
<div class="form-group col-md-6">
<label for="Mob">Mobile : </label>
<input type="number" class="form-control" name="Mob" placeholder="Mobile">
</div>
<div class="form-group col-md-6">
<label for="Dob" >DoB : </label>
<input type="date" class="form-control" name="DoB">
</div>
</div>
<div class="form-group">
<label for="cen">Nearby centre</label>
<select class="form-control" id="sel1">
<option selected disabled>Select your Nearest Centre</option>
<option>Karachi West</option>
<option>Karachi East</option>
<option>Karachi North</option>
<option>Karachi Central</option>
<option>Malir</option>
</select>
</div>
</table>
<button type="button" class="btn btn-primary">Submit</button>
</form>
</div>
JavaScript
function validateForm()
{
var varname = document.vacform.name.value;
var varcnic = document.vacform.CNIC.value;
var varMob = document.vacform.Mob.value;
var varDoB = new Date(DoB);
var limitdate = new Date('2010-01-01');
var CNlength = 13;
var num = /^[0-9]+$/;
var str = /^[A-Za-z]+$/;
if(document.vacform.name.value!="")
{
if(document.vacform.CNIC.value!="")
{
if(document.vacform.Mob.value!="")
{
if(document.vacform.DoB.value!="")
{
if(varname.match(str))
{
if(varcnic.lenght == CNlength)
{
if(varcnic.match(num))
{
if(varDoB.getYear() < limitdate.getYear())
{
alert("All types of Validations have been done")
return true;
}
else
{
alert("Date should be less than 01-01-2010")
return false;
}
}
else
{
alert("CNIC field should have numbers only")
return false;
}
}
else
{
alert("CNIC lenght should be 13")
return false;
}
}
else
{
alert("Name can only contain letters")
return false;
}
}
else
{
alert("Date of Birth must be entered")
return false;
}
}
else
{
alert("Please Enter your mobile number")
return false;
}
}
else
{
alert("CNIC number Required")
return false;
}
}
else
{
alert("Name field can not be empty")
return false;
}
}
</script>

You call the function from the onsubmit event handler, however you never submit the form so it can't be triggered.
<button type="button" class="btn btn-primary">Submit</button>
This kind of button is for hooking JS into. It isn't a submit button.
Set type="submit" or remove the type attribute entirely (submit is the default).
Also address the errors in your HTML that a validator would highlight.

Form is not submitting , not sure if this has to do with the captcha

I am trying to tie the code in together.
I recently just made a form and found a captcha on codepen that I wanted to try out
But for some reason I cant get the captcha to validate the form even though it does perform the calculation. Any idea what could be causing the problem in my code? Thanks in advance.
<form
class="form mt-4"
method="POST"
action="action_page.php">
<!-- Name Field -->
<div class="form-group">
<label for="name">Name:</label>
<input
type="text"
name="name"
id="name"
placeholder="Enter Your Name"
class="form-control"
required
/>
</div>
<!-- Email Field -->
<div class="form-group">
<label for="email"
>Email Address:</label
>
<input
type="email"
name="email"
id="email"
placeholder="Enter Your Email"
class="form-control"
required
/>
</div>
<!-- Password Field -->
<div class="form-group">
<label for="password"
>Password:</label
>
<input
type="password"
name="password"
minlength="8"
id="password"
placeholder="Password"
class="form-control"
required
/>
</div>
<!-- Confirm Password Field -->
<div class="form-group">
<label for="confirm_password"
>Confirm Password:</label
>
<input
type="password"
name="confirm_password"
minlength="8"
id="confirm_password"
placeholder="Confirm Password"
class="form-control"
required
/>
</div>
<!-- Telegram API Token Field -->
<div class="form-group">
<label for="telegram_token"
>Telegram API Token:</label
>
<input
type="text"
name="telegram_token"
id="telegram_token"
placeholder="Enter Telegram API Token"
class="form-control"
required
/>
</div>
<!-- Telegram Chat ID Field -->
<div class="form-group">
<label for="telegram_id"
>Telegram Chat ID:</label
>
<input
type="text"
name="telegram_id"
id="telegram_id"
placeholder="Enter Telegram Chat ID"
class="form-control"
required
/>
</div>
<!-- Captcha Field -->
<div class="form-group">
<label>Are you human?</label>
<br />
<label class="submit__control">
<div
class="submit__generated"
></div>
<i
class="fa fa-refresh"
></i>
<span
class="submit__error hide"
>Incorrect value</span
>
<span
class="submit__error--empty hide"
>Required field cannot
be left blank</span
>
</label>
</div>
<!-- Register Button -->
<div class="form-group">
<button
type="submit"
class="btn btn-info btn-block"
>
Register
</button>
var a,
b,
c,
submitContent,
captcha,
locked,
validSubmit = false,
timeoutHandle;
// Generating a simple sum (a + b) to make with a result (c)
function generateCaptcha() {
a = Math.ceil(Math.random() * 10);
b = Math.ceil(Math.random() * 10);
c = a + b;
submitContent =
"<span>" +
a +
"</span> + <span>" +
b +
"</span>" +
' = <input class="submit__input" type="text" maxlength="2" size="2" required />';
$(".submit__generated").html(submitContent);
init();
}
// Check the value 'c' and the input value.
function checkCaptcha() {
if (captcha === c) {
// Pop the green valid icon
$(".submit__generated").removeClass("unvalid").addClass("valid");
$(".submit").removeClass("overlay");
$(".submit__overlay").fadeOut("fast");
$(".submit__error").addClass("hide");
$(".submit__error--empty").addClass("hide");
validSubmit = true;
} else {
if (captcha === "") {
$(".submit__error").addClass("hide");
$(".submit__error--empty").removeClass("hide");
} else {
$(".submit__error").removeClass("hide");
$(".submit__error--empty").addClass("hide");
}
// Pop the red unvalid icon
$(".submit__generated").removeClass("valid").addClass("unvalid");
$(".submit").addClass("overlay");
$(".submit__overlay").fadeIn("fast");
validSubmit = false;
}
return validSubmit;
}
function unlock() {
locked = false;
}
// Refresh button click - Reset the captcha
$(".submit__control i.fa-refresh").on("click", function () {
if (!locked) {
locked = true;
setTimeout(unlock, 500);
generateCaptcha();
setTimeout(checkCaptcha, 0);
}
});
// init the action handlers - mostly useful when 'c' is refreshed
function init() {
$("form").on("submit", function (e) {
e.preventDefault();
if ($(".submit__generated").hasClass("valid")) {
// var formValues = [];
captcha = $(".submit__input").val();
if (captcha !== "") {
captcha = Number(captcha);
}
checkCaptcha();
if (validSubmit === true) {
validSubmit = false;
// Temporary direct 'success' simulation
submitted();
}
} else {
return false;
}
});
// Captcha input result handler
$(".submit__input").on(
"propertychange change keyup input paste",
function () {
// Prevent the execution on the first number of the string if it's a 'multiple number string'
// (i.e: execution on the '1' of '12')
window.clearTimeout(timeoutHandle);
timeoutHandle = window.setTimeout(function () {
captcha = $(".submit__input").val();
if (captcha !== "") {
captcha = Number(captcha);
}
checkCaptcha();
}, 150);
}
);
// Add the ':active' state CSS when 'enter' is pressed
$("body")
.on("keydown", function (e) {
if (e.which === 13) {
if ($(".submit-form").hasClass("overlay")) {
checkCaptcha();
} else {
$(".submit-form").addClass("enter-press");
}
}
})
.on("keyup", function (e) {
if (e.which === 13) {
$(".submit-form").removeClass("enter-press");
}
});
// Refresh button click - Reset the captcha
$(".submit-control i.fa-refresh").on("click", function () {
if (!locked) {
locked = true;
setTimeout(unlock, 500);
generateCaptcha();
setTimeout(checkCaptcha, 0);
}
});
// Submit white overlay click
$(".submit-form-overlay").on("click", function () {
checkCaptcha();
});
}
generateCaptcha();
// Password Match Function
function check(input) {
if (input.value != document.getElementById('password').value) {
input.setCustomValidity('Passwords do not match.');
} else {
// input is valid -- reset the error message
input.setCustomValidity('');
}
}

It was the function for submit was missing

html form validation using javascript

i am trying to validate my html form using javascript. the validation works but it still submits.
ie. when clicking submit a text will appear saying "first name is required" but then still submits.
here is the javascript code:
function validateForm(form) {
formValid = true;
for(i = 0; i < form.length; i++) {
if(!requiredInput(form[i]))
formValid = false;
}
return formValid;
}
function requiredInput(element) {
if(!element.value.length) {
document.getElementById(element.id + 'Error').style.display = "inline-block";
return false;
} else {
document.getElementById(element.id + 'Error').style.display = "none";
return true;
}
return;
}
and here is the html code for the form:
<form action="http://tl28dfdsdsserv.westernsydney.edu.au/twainfo/echo.php" method="get" onsubmit="return validateForm(this);">
<h2>Validate you name:</h2>
<div>
<label for="fname">First Name</label>
<input type="text" id="fname" name="fname" placeholder="Given Name" onblur="requiredInput(this);">
<span class="error" id="fnameError">First Name is Required</span>
</div>
<div>
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lname" placeholder="Surname" onblur="requiredInput(this);">
<span class="error" id="lnameError">Last Name is Required</span>
</div>
<div>
<hr>
</div>
<div>
<input type="submit" value="Submit" name="submit" >
</div>
</form>
im not sure why it still submits.
EDIT: i need to debug this code and not change all of it
EDIT: i can not change the html code for this, i am to debug the javascript only

I think you need validate if its type submit :
function validateForm(form) {
formValid = true;
for(i = 0; i < form.length; i++) {
if(form[i].type != "submit"){
if(!requiredInput(form[i])){
formValid = false;
}
}
}
return formValid;
}

Your validation has the correct structure, however, if there is any JavaScript error, the "return false" will not cancel the form submission.
Go to your developer console and manually invoke the validateForm function. You can give the form an ID:
<form id="myform"...
Then, you can reference this in the console:
validateForm(document.getElementById('form'));
You will see a JavaScript error. Fix the error and your form will be intercepted.

<form action="http://tl28dfdsdsserv.westernsydney.edu.au/twainfo/echo.php" method="get"
onsubmit="return validateForm(event)">
<h2>Validate you name:</h2>
<div>
<label for="fname">First Name</label>
<input type="text" id="fname" name="fname" placeholder="Given Name" onblur="requiredInput(this);">
<span class="error" id="fnameError">First Name is Required</span>
</div>
<div>
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lname" placeholder="Surname" onblur="requiredInput(this);">
<span class="error" id="lnameError">Last Name is Required</span>
</div>
<div>
<hr>
</div>
<div>
<input type="submit" value="Submit" name="submit">
</div>
<script type="text/javascript">
function validateForm(e) {
form = e.target;
formValid = true;
for (i = 0; i < form.length; i++) {
if (!requiredInput(form[i]))
formValid = false;
}
return formValid;
}
function requiredInput(element) {
if (element.type == 'submit') {
return true;
}
if (element.value.length == 0) {
document.getElementById(element.id + 'Error').style.display = "inline-block";
return false;
} else {
document.getElementById(element.id + 'Error').style.display = "none";
return true;
}
}
this should work

Actually You can do it simple way, see below,
Modify your HTML
I remove onsubmit attribute and add form to ID
<form id="dsds" action="http://tl28dfdsdsserv.westernsydney.edu.au/twainfo/echo.php" method="get">
<h2>Validate you name:</h2>
<div>
<label for="fname">First Name</label>
<input type="text" id="fname" name="fname" placeholder="Given Name" onblur="requiredInput(this);">
<span class="error" id="fnameError">First Name is Required</span>
</div>
<div>
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lname" placeholder="Surname" onblur="requiredInput(this);">
<span class="error" id="lnameError">Last Name is Required</span>
</div>
<div>
<hr>
</div>
<div>
<input type="submit" value="Submit" name="submit" >
</div>
Remove your JS function and do like this,
$("#dsds").submit(function(e){
//call your functions here
return false; // return true if you want to submit the form
});
See the example,
JSFille

Use preventDefault() to disable the submit.
function validateForm(event, form) {
formValid = true;
for (i = 0; i < form.length; i++) {
if (!requiredInput(form[i])) {
formValid = false;
break;
}
}
if (!formValid) {
event.preventDefault();
}
return formValid;
}
And pass the event object in the onsubmit function like below.
<form action="http://tl28dfdsdsserv.westernsydney.edu.au/twainfo/echo.php" method="get" onsubmit="validateForm(event, this);">

function validateForm(form) {
formValid = true;
try {
for (i = 0; i < form.length; i++) {
if (!requiredInput(form[i]))
formValid = false;
}
} catch (error) {
console.error("validateForm=>", error)
}
return formValid;
}
function requiredInput(element) {
try {
const elementInputError = document.getElementById(element.id + 'Error');
if (!element.value.length) {
elementInputError && setDisplayError(elementInputError,"inline-block");
return false;
} else {
elementInputError && setDisplayError(elementInputError,"none");
return true;
}
} catch (error) {
console.error("requiredInput=>", error)
return false;
}
}
function setDisplayError(element,value) {
try {
element.style.display =value;
} catch (error) {
console.error("setDisplayError=>", error)
}
}
<form action="http://tl28dfdsdsserv.westernsydney.edu.au/twainfo/echo.php" method="get"
onsubmit="return validateForm(this);">
<h2>Validate you name:</h2>
<div>
<label for="fname">First Name</label>
<input type="text" id="fname" name="fname" placeholder="Given Name" onblur="requiredInput(this);">
<span class="error" id="fnameError">First Name is Required</span>
</div>
<div>
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lname" placeholder="Surname" onblur="requiredInput(this);">
<span class="error" id="lnameError">Last Name is Required</span>
</div>
<div>
<hr>
</div>
<div>
<input type="submit" value="Submit" name="submit">
</div>
</form>
The problem arose because it also validated the send button and because it did not have the termination of the failed id it could not find the item and an error occurred. Then when the error occurred it did not return anything the function and redirect you to the form action page.

Contact Form Redirecting Prevent Default Not Working

I've tried this many different ways... don't know why this is redirecting still. I suppose in the past I've always used a button instead of a submit input and as such I never ran into this issue. However, I think it's time to get to the bottom of this!
HTML FORM
<form class="col-xs-12" action="mail.php" method="POST" >
<h2 class="headerFont">Contact</h2>
<p>Use the form below to send to contact me via email. I will be in touch soon after receiving your message.</p>
<div class="row">
<div class="col-xs-12 col-sm-6">
<input class="col-xs-12" placeholder="Full Name" title="Enter Full Name" type="text" name="name">
<input class="col-xs-6" placeholder="Email Address" title="Enter Email Address" type="email" name="email">
<input class="col-xs-6" placeholder="Mobile Phone Number" title="Enter Mobile Phone Number" type="tel" name="phone">
<input class="col-xs-12" placeholder="Street Address" title="Enter Street Address" type="text" name="address">
<input type="text" name="_gotcha" id="_gotcha" style="display: none !important">
<select class="col-xs-12" name="service">
<option selected disabled>Select Service</option>
<option>Group Walking</option>
<option>Private Walking</option>
<option>Pet Sitting</option>
</select>
</div>
<div class="col-xs-12 col-sm-6">
<textarea class="col-xs-12" placeholder="Message Here" rows="10" name="message"></textarea>
</div>
</div>
<input type="submit" value="Send" onclick="formSubmit(e)">
</form>
JAVASCRIPT CODE
function formSubmit(e) {
e.preventDefault();
return false;
console.log("Ajax Init");
var form = e.target,
data = new FormData(),
xhr = new XMLHttpRequest();
for (var i = 0, ii = form.length - 1; i < ii; ++i) {
var input = form[i];
data.append(input.name, input.value);
if (input.getAttribute("name") !== "_gotcha") {
if (input.value === "" || input.value === null || input.value === "undefined") {
alert("Please fill out all form fields before submitting");
break;
}
}
}
xhr.open(form.method.toUpperCase(), form.action, true);
if (document.getElementById("_gotcha").value.length == 0){
xhr.send(data);
} else {
break;
}
xhr.onloadend = function () {
// done
for (var i = 0, ii = form.length - 1; i < ii; ++i) {
var input = form[i];
input.value = "";
}
alert("Message Sent - Thank You");
};
};

It seems a better option is to use onsubmit attribute.
function formSubmit(form) {
console.log("Ajax Init");
var data = new FormData(form), // simpler
xhr = new XMLHttpRequest();
for (var i = 0, ii = form.length - 1; i < ii; ++i) {
var input = form[i];
//data.append(input.name, input.value);
if (input.getAttribute("name") !== "_gotcha") {
if (input.value === "" || input.value === null || input.value === "undefined") {
alert("Please fill out all form fields before submitting");
// something went wrong, prevent form from submitting
return false;
}
}
}
xhr.open(form.method.toUpperCase(), form.action, true);
if (document.getElementById("_gotcha").value.length == 0) {
xhr.send(data);
} else {
// something went wrong, prevent form from submitting
return false;
}
xhr.onloadend = function() {
// done
for (var i = 0, ii = form.length - 1; i < ii; ++i) {
var input = form[i];
input.value = "";
}
alert("Message Sent - Thank You");
};
// everything went ok, submit form
return true;
};
<!-- note the use of return -->
<form class="col-xs-12" action="mail.php" method="POST" onsubmit="return formSubmit(this)">
<h2 class="headerFont">Contact</h2>
<p>Use the form below to send to contact me via email. I will be in touch soon after receiving your message.</p>
<div class="row">
<div class="col-xs-12 col-sm-6">
<input class="col-xs-12" placeholder="Full Name" title="Enter Full Name" type="text" name="name">
<input class="col-xs-6" placeholder="Email Address" title="Enter Email Address" type="email" name="email">
<input class="col-xs-6" placeholder="Mobile Phone Number" title="Enter Mobile Phone Number" type="tel" name="phone">
<input class="col-xs-12" placeholder="Street Address" title="Enter Street Address" type="text" name="address">
<input type="text" name="_gotcha" id="_gotcha" style="display: none !important">
<select class="col-xs-12" name="service">
<option selected disabled>Select Service</option>
<option>Group Walking</option>
<option>Private Walking</option>
<option>Pet Sitting</option>
</select>
</div>
<div class="col-xs-12 col-sm-6">
<textarea class="col-xs-12" placeholder="Message Here" rows="10" name="message"></textarea>
</div>
</div>
<!-- upon clicking on the submit button, it will trigger the form's onsubmit handler -->
<input type="submit" value="Send">
</form>

i suggest to use jquery inside of core javascript becuase in javascript it to mush code want to write , i write for you in jquery
step 1: : give id to form tag id="myForm"
step 2: : write script like this
<script>
$('#myForm').submit(function(e){
e.preventDefualt();
data = $(this)..serialize();
});
</script>

Form validation not working on submit

After clicking submit the form is not producing errors next to the input fields ,it refreshes the page and clears all the fields.
HTML:
<form id="mc-form" method="POST">
<div class="form-group col-xs-12 ">
<label for="name" hidden>שם פרטי</label>
<input type="text" name="name" id="name" class="cv form-control" placeholder="שם פרטי" onkeyup='validateMessage()'>
<span class='error-message' id='name-error'></span>
</div>
<div class="form-group col-xs-12 ">
<label for="lastName" hidden>שם משפחה</label>
<input type="text" name="lastName" id="lastName" class="cv form-control" placeholder="שם משפחה" onkeyup='validateMessage()'>
<span class='error-message' id='name-error'></span>
</div>
<div class="form-group col-xs-12 ">
<label for="phone" hidden>טלפון</label>
<input type="text" name="phone" id="phone" class="cv form-control" placeholder="טלפון" onkeyup='validateMessage()'>
<span class='error-message' id='name-error'></span>
</div>
<div class="form-group col-xs-12 ">
<label for="email" hidden>דואר אלקטרוני</label>
<input type="email" name="email" id="email" class="cv form-control" placeholder="דואר אלקטרוני" onkeyup='validateMessage()'>
<span class='error-message' id='name-error'></span>
</div>
<div class="form-group col-xs-12 ">
<label for="subject" hidden>נושא</label>
<input type="text" name="subject" id="subject" class="cv form-control" placeholder="נושא" onkeyup='validateMessage()'>
</div>
<div class="form-group col-xs-12 ">
<label for="message" hidden>הודעה</label>
<textarea name="message" id="message" class="cv form-control message" placeholder="השאירו את הודעתכם פה" rows="4" cols="50" onkeyup='validateMessage()'></textarea>
</div>
<!-- <input type="submit" id="submit-button" class="btn btn-custom-outline " value="שלח" > -->
<button onclick='return validateForm()' class="btn btn-custom-outline " id="submit-button">שלח</button>
<span class='error-message' id='submit-error'></span>
<br>
<!-- <div class="success"><?= $success ?></div>-->
<!--<span class="error"></span> -->
</form>
My JavaScript:
function validateName() {
var name = document.getElementById('name').value;
if(name.length == 0) {
producePrompt('Name is required', 'name-error' , 'red')
return false;
}
if (!name.match( /^[a-zא-ת]+(\s[a-zא-ת]+)*$/i)) {
producePrompt('Letters only please.','name-error', 'red');
return false;
}
producePrompt('Valid', 'name-error', 'green');
return true;
}
function validatePhone() {
var phone = document.getElementById('phone').value;
if(phone.length == 0) {
producePrompt('Phone number is required.', 'phone-error', 'red');
return false;
}
if(!phone.match(/^[0-9]{10}$/)) {
producePrompt('Only digits, please.' ,'phone-error', 'red');
return false;
}
producePrompt('Valid', 'phone-error', 'green');
return true;
}
function validateEmail () {
var email = document.getElementById('email').value;
if(email.length == 0) {
producePrompt('Email Invalid','email-error', 'red');
return false;
}
if(!email.match(/^[A-Za-z\._\-[0-9]*[#][A-Za-z]*[\.][a-z]{2,4}$/)) {
producePrompt('Email Invalid', 'email-error', 'red');
return false;
}
producePrompt('Valid', 'email-error', 'green');
return true;
}
/*function validateMessage() {
var message = document.getElementById('contact-message').value;
var required = 30;
var left = required - message.length;
if (left > 0) {
producePrompt(left + ' more characters required','message-error','red');
return false;
}
producePrompt('Valid', 'message-error', 'green');
return true;
}*/
function validateForm() {
if (!validateName() || !validatePhone() || !validateEmail() ) {
jsShow('submit-error');
producePrompt('Please fix errors to submit.', 'submit-error', 'red');
setTimeout(function(){jsHide('submit-error');}, 2000);
return false;
}
else {
}
}
function jsShow(id) {
document.getElementById(id).style.display = 'block';
}
function jsHide(id) {
document.getElementById(id).style.display = 'none';
}
function producePrompt(message, promptLocation, color) {
document.getElementById(promptLocation).innerHTML = message;
document.getElementById(promptLocation).style.color = color;
}
My scrips are in index.html , same page the form is, in the end :
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" ></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" ></script>
<script src="js/bootstrap.min.js" ></script>
<!-- [ SLIDER SCRIPT ] -->
<script type="text/javascript" src="js/SmoothScroll.js"></script>
<script src="js/script.js" ></script>
<script src="js/validateform.js" ></script>
After clicking submit the form is not producing errors next to the input fields ,it refreshes the page and clears all the fields.

The issue that you are running into in calling
producePrompt('Email Invalid','email-error', 'red');
and any other where you are not passing name-error an error is occurring as there is no element with the id email-error they all have the same id. When the error is thrown the function returns undefined instead of false causing the form to be submitted.
When using Chrome dev tools you can go into settings and check preserve log this will allow you to see errors even after the page refreshes.
As to checking for all errors instead of just the first one...
the if (!validateName() || !validatePhone() || !validateEmail() ) {
or statements here mean the first one that false causes the rest to not be checked. Instead you could do something like the following
var vn = validateName();
var vp = validatePhone();
var ve = validateEmail();
if (!vn || !vp || !ve) {