Develop Reference

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.

Why doesn't Javascript validate my html code?

This is my first attempt at working with javascript and forms; for some reason my html website elements aren't being validated and I am not sure why. My goal with this form is trying to validate the elements that have an '*' next to them. For some reason the only element that is being validated is email and nothing else. Name, dates, the checkbox aren't. I have been trying to find a fix, but nothing seems to work.
<!doctype html>
<html>
<head>
<link href="styles.css" rel="stylesheet">
<script src="script.js"></script>
<meta charset="utf-8">
<title>Form</title>
</head>
<body>
<div class="container">
<h1>Travel Reservation Form</h1>
<h4>* denotes mandotory field</h4>
<form name="myForm" action="action_page.php" onsubmit="return validateForm()" method="post">
<fieldset>
<legend>Personal Details</legend>
<label class="align">Full name:<span>*</span></label> <input type="text" name="fullname" placeholder="James Bond">
<br><br>
<label class="align">Email<span>*</span></label>
<input type="email" name="mail" placeholder="james#gmail.com">
<br><br>
<label class="align">Date of Birth<span>*</span></label> <input type="date" name="DOB" placeholder="dd/mm/yy">
</fieldset>
<br>
<label>Select Tour Package<span>*</span>:</label>
<select name="package">
<option value="1">Tokyo</option>
<option value="2">Shanghai</option>
<option value="3">Bangkok</option>
<option value="4">Jakarta</option>
<option value="5">Mumbai</option>
</select>
<label>Number of persons<span>*</span>:</label>
<select name="party">
<option value="1">One Adult</option>
<option value="2">Two Adults</option>
<option value="3">Three Adults</option>
<option value="4">Four Adults</option>
<option value="5">Five Adults</option>
</select>
<br><br>
<label>Arrival Date<span>*</span>:</label> <input type="date" name="arrival" placeholder="dd/mm/yy">
<br><br>
<p>What Intrests you the most?<span>*</span>:</p>
<input class="alignp" type="checkbox" name="interest" value="shopping"> Shopping <br><br>
<input class="alignp" type="checkbox" name="interest" value="dining"> Dining <br><br>
<input class="alignp" type="checkbox" name="interest" value="dancing"> Dancing <br><br>
<input class="alignp" type="checkbox" name="interest" value="SightS"> Sightseeing <br><br><br>
<label>Discount Coupon code:</label> <input type="text" name="dis_code" value=""><br><br>
<label>Terms and Conditions<span>*</span><input type="radio" name="tos" value="yes" checked>I agree</label>
<input type="radio" name="tos" value="yes">I disagree
<p>Please provide any additional information below:- </p>
<textarea name="message" rows="5" cols="45" placeholder="Please type here...."></textarea><br><br>
<button class="btn-submit" type="submit" value="Submit">Submit</button>
<button class="btn-reset" type="reset" value="Reset">Reset</button>
</form>
</div>
</body>
</html>
Here is the javascript that is being linked in the html. I am unsure whether the issue is with my html code or with my javascript.
// JavaScript Document
function validateForm()
{
var name = document.forms["myForm"]["name"].value;
var email = document.forms["myForm"]["email"].value;
var dob = document.forms["myForm"]["DOB"].value;
var packages = document.forms["myForm"]["package"].value;
var arrival = document.forms["myForm"]["arrival"].value;
//var interest = document.forms["form"]["interest"].value;
var ToS = document.forms["myForm"]["tos"].value;
var checkbox = document.querySelector('input[name="interest"]:checked');
var matches = name.match(/\d+/g);
if (matches != null) {
alert("Name has a number in it!");
}
if (name == "") {
alert("Name must be filled out");
return false;
}
if (email == "") {
alert("Email must be filled out");
return false;
}
if (dob == "") {
alert("Date of Birth must not be empty");
return false;
}
if (arrival == "") {
alert("Arrival Date must not be empty");
return false;
}
if(ToS == false) {
alert("You must agree to the Terms of Service");
return false;
}
if(validateEmail(email) == false){
alert("Must enter a valid email");
}
re = /^\d{1,2}\/\d{1,2}\/\d{4}$/;
if(dob != '' && !dob.match(re)) {
alert("Invalid date format");
return false;
}
if(arrival != '' && !arrival.match(re)) {
alert("Invalid arrival date format") ;
return false;
}
if(name.length >= 30){
alert("Name must be less than 30 characters!");
return false;
}
if(!checkbox){
alert("Please select an interest!");
return false;
}
}
function validateEmail(email)
{
return /\S+#\S+\.\S+/.test(email);
}

So I have no idea what your PHP form did, so I actually just pulled all the form code for now. There were a lot of little issues but honest mistakes. Example: you don't want a return statement after every validation if you want to continue validating the rest of the fields. I combined some separate validations into if/else's since they were validations on the same field. I used ID's to make my life easier and since I dumped the form code. Feel free to swap back to what you want. I also updated your regex since the date field returns YYYY/MM/DD. Since this doesn't post anywhere you can play with it for a while, before tying back into your php form. I also pulled the check for 30 characters and added a max field length to name. You could also set min and max date ranges for the date fields and a bunch of other things to help make the fields themselves more foolproof. There are also libraries that handle this kind of thing for you, you don't have to re-invent the wheel, but if you're just looking to play around with it this should get you started. Good Luck
<!doctype html>
<html>
<body>
<div class="container">
<h1>Travel Reservation Form</h1>
<h4>* denotes mandotory field</h4>
<fieldset>
<legend>Personal Details</legend>
<label class="align">Full name:<span>*</span></label> <input type="text" name="fullname" id='name' maxlength="30" placeholder="James Bond">
<br><br>
<label class="align">Email<span>*</span></label>
<input id="email" type="email" name="mail" placeholder="james#gmail.com">
<br><br>
<label class="align">Date of Birth<span>*</span></label> <input type="date" id="dob" name="DOB" placeholder="dd/mm/yy">
</fieldset>
<br>
<label>Select Tour Package<span>*</span>:</label>
<select id='package' name="package">
<option value="1">Tokyo</option>
<option value="2">Shanghai</option>
<option value="3">Bangkok</option>
<option value="4">Jakarta</option>
<option value="5">Mumbai</option>
</select>
<label>Number of persons<span>*</span>:</label>
<select name="party">
<option value="1">One Adult</option>
<option value="2">Two Adults</option>
<option value="3">Three Adults</option>
<option value="4">Four Adults</option>
<option value="5">Five Adults</option>
</select>
<br><br>
<label>Arrival Date<span>*</span>:</label> <input type="date" name="arrival" id="arrival" placeholder="dd/mm/yy">
<br><br>
<p>What Intrests you the most?<span>*</span>:</p>
<input class="alignp" type="checkbox" name="interest" value="shopping"> Shopping <br><br>
<input class="alignp" type="checkbox" name="interest" value="dining"> Dining <br><br>
<input class="alignp" type="checkbox" name="interest" value="dancing"> Dancing <br><br>
<input class="alignp" type="checkbox" name="interest" value="SightS"> Sightseeing <br><br><br>
<label>Discount Coupon code:</label> <input type="text" name="dis_code" value=""><br><br>
<label>Terms and Conditions<span>*</span>
<input type="radio" name="tos" id="accpeted" value="agree" checked>I agree</label>
<input type="radio" name="tos" id="unaccepted" value="disagree">I disagree
<p>Please provide any additional information below:- </p>
<textarea name="message" rows="5" cols="45" placeholder="Please type here...."></textarea><br><br>
<button class="btn-submit" id="submit" onclick="return validateForm()">Submit</button>
</div>
<script>
// JavaScript Document
function validateForm() {
var name = document.getElementById("name").value;
var email = document.getElementById("email").value;
var dob = document.getElementById("dob").value;
//Select Box
var e = document.getElementById("package");
// Selected Item
var packages = e.options[e.selectedIndex].value;
var arrival = document.getElementById("arrival").value;
//var interest = document.getElementById("").value;
var tos = document.querySelector('input[name="tos"]:checked').value;
//var checkbox = document.getElementById("").value;;
var matches = name.match(/\d+/g);
var re = /^\d{4}([.\/-])\d{2}\1\d{2}$/;
if (!name) {
alert("Name must be filled out");
} else {
if (matches != null) {
alert("Name has a number in it!: " + name);
}
}
if (!email) {
alert("Email must be filled out");
} else {
if (validateEmail(email) == false) {
alert("Must enter a valid email: " + email);
}
}
if (!dob) {
alert("Date of Birth must not be empty");
} else {
if (!dob.match(re)) {
alert(" Dob has Invalid date format: " + dob);
}
}
if (!arrival) {
alert("Arrival Date must not be empty");
} else {
if (!arrival.match(re)) {
alert(" Dob has Invalid date format: " + arrival);
}
}
if (tos != "agree") {
alert("You must agree to the Terms of Service");
}
}
function validateEmail(email) {
return /\S+#\S+\.\S+/.test(email);
}
</script>
</body>
</html>

Inserting regular expression for verifying URL address and email address

I need to insert a regular expression to verify the input for URL and email is valid, so where would this go in the code to make it work without messing with anything else? I need to know exactly where it would go and how it would look.
window.onload = function() {
document.getElementById('ifBusiness').style.display = 'none';
}
function BusinessorResidence() {
var is_business = document.getElementById('businessCheck').checked;
if (is_business) {
document.getElementById('ifBusiness').style.display = 'block';
document.getElementById('ifResidence').style.display = 'none';
} else {
document.getElementById('ifBusiness').style.display = 'none';
document.getElementById('ifResidence').style.display = 'block';
}
}
function validateForm() {
var is_business = document.getElementById('businessCheck').checked;
var address = document.forms["myForm"]["address"];
var bname = document.forms["myForm"]["bname"];
var url = document.forms["myForm"]["url"];
var tax = document.forms["myForm"]["tax"];
var rname = document.forms["myForm"]["rname"];
var email = document.forms["myForm"]["email"];
// Address always has to be checked
if (address.value == "") {
alert("Please enter an address.");
address.focus();
return false;
}
// Check the bname, tax and url if a business is selected
if (is_business) {
if (bname.value == "") {
alert("Please enter a business name.");
// focus() is a method, not a property, so you need to call this function to actually focus the text input.
bname.focus();
return false;
}
if (tax.value == "") {
alert("Please enter a business tax ID.");
tax.focus();
return false;
}
if (url.value == "") {
alert("Please enter a business URL.");
url.focus();
return false;
}
}
// Else check the rname and the email
else {
if (rname.value == "") {
alert("Please enter a residence name.");
rname.focus();
return false;
}
if (email.value == "") {
alert("Please enter an email address.");
email.focus();
return false;
}
}
// Open the popup window.
// _blank refers to it being a new window
// SELU is the name we'll use for the window.
// The last string is the options we need.
var popup = window.open('', 'SELU', 'toolbar=0,scrollbars=0,location=0,statusb ar=0,menubar=0,resizable=0,width=400,height=400,left=312,top=234');
// Set the form target to the name of the newly created popup.
var form = document.querySelector('form[name="myForm"]');
form.setAttribute('target', 'SELU');
return true;
}
head {
text-align: center;
}
body {
text-align: center;
}
.bold {
font-weight: bold;
}
<!DOCTYPE html>
<html>
<head>
<title>Javascript Assignment</title>
<!-- the titles should be inside the title, not inside the <head> tag -->
<h1>Fill the form below</h1>
<!-- center tag is deprecated and should be replaced by CSS -->
</head>
<body>
<form name="myForm" action="http://csit.selu.edu/cgi-bin/echo.cgi" onsubmit="return validateForm()" method="post">
<p>
<b>Address: </b>
<input type="text" name="address">
</p>
<div>
<div>
<input type="radio" onclick="javascript:BusinessorResidence();" name="businessresidence" id="businessCheck">This is a Business
<input type="radio" onclick="javascript:BusinessorResidence();" name="businessresidence" id="residenceChceck">This is a Residence
<br>
<div id="ifBusiness" style="display:none">
<!-- <b> tag is deprecated. should be done with CSS -->
<span class="bold">Business Name:</span>
<input type="text" id="name" name="bname">
<br>
<span class="bold">Business Website URL:</span>
<input type="text" id="url" name="url">
<br>
<span class="bold">Business Tax ID: </span>
<input type="text" id="tax" name="tax">
</div>
<div id="ifResidence" style="display:none">
<b>Name: </b>
<input type="text" id="name" name="rname">
<br>
<b>Email: </b>
<input type="text" id="email" name="email">
</div>
</div>
</div>
<input type="submit" value="Submit">
</form>
<hr>
<hr>
</body>
</html>

To validate whether or not a user is inputting an url/email, simply change your input type to "url" or "email" and it will be validated for you.
Like so:
<form name="myForm" action="http://csit.selu.edu/cgi-bin/echo.cgi" onsubmit="return validateForm()" method="post">
<p>
<b>Address: </b>
<input type="text" name="address">
</p>
<div>
<div>
<input type="radio" onclick="javascript:BusinessorResidence();" name="businessresidence" id="businessCheck">This is a Business
<input type="radio" onclick="javascript:BusinessorResidence();" name="businessresidence" id="residenceChceck">This is a Residence
<br>
<div id="ifBusiness" style="display:none">
<!-- <b> tag is deprecated. should be done with CSS -->
<span class="bold">Business Name:</span>
<input type="text" id="name" name="bname">
<br>
<span class="bold">Business Website URL:</span>
<input type="url" id="url" name="url">
<br>
<span class="bold">Business Tax ID: </span>
<input type="text" id="tax" name="tax">
</div>
<div id="ifResidence" style="display:none">
<b>Name: </b>
<input type="text" id="name" name="rname">
<br>
<b>Email: </b>
<input type="email" id="email" name="email">
</div>
</div>
</div>
<input type="submit" value="Submit">
</form>

Javascript Error message flashes for only a second [duplicate]

This question already has answers here:
What is the meaning of onsubmit="return false"? (JavaScript, jQuery)
(4 answers)
Closed 5 years ago.
I have this HTML project that validates an empty form. The error is being displayed on the side of the inputs but only flashes for a second. I just want the error of the messages to be displayed once
This is my HTML code with the necessary links:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript - JQuery </title>
<link rel="stylesheet" type="text/css" href="contactform.css">
</head>
<body>
<h1 id="pageheading">Zedland Health Authority</h1>
<h2 class="sectionheading">Contact Form</h2>
<form id="register">
<fieldset id="controls">
<div>
<label class="formlabel" for="fname">First Name: </label>
<input id="fname" type="text" size="30" placeholder="First name"
autofocus>
<p id="fname-error" class="error" style="display:none; color:red;">*
You must enter a first name.</p>
</div>
<div>
<label class="formlabel"for="lname">Last Name: </label>
<input id="lname" type="text" size="30">
<p id="lname-error" class="error" style="display:none; color:red;">*
You must enter a Last name.</p>
</div>
<div>
<label class="formlabel" for="title">Title: </label>
<select id="title">
<option value="Mr">Mr.</option>
<option value="Ms">Ms.</option>
<option value="Mrs">Mrs.</option>
<option value="Miss">Miss.</option>
<option value="Master">Master.</option>
</select>
</div>
<div>
<label class="formlabel" for="heathauthoritynumber"><span>
<img src="tooltip.png" id="qmark" alt="Hint"></span>
Health Authority Number:
</label>
<input id="healthauthoritynumber" type="text" size="10">
<p id="hn-error" class="error" style="display:none; color:red;">*You
must enter a Health Authority Number eg('ZHA345742)</p>
<div class="tooltip" id="ttip">If you do not know your ZHA number
,please contact your GP</div>
</div>
<div>
<label class="formlabel" for="email">Email: </label>
<input id="email" type="text" size="40">
<p id="email-error" class="error" style="display:none; color:red;">You
must enter email</p>
</div>
<div>
<label class="formlabel" for="telephone">Telephone Number: </label>
<input id="telephone" type="text" size="40">
<p id="tele-error" class="error" style="display:none; color:red;">You
must enter a telephone</p>
</div>
<div class="formlabel">
<input id="submit-button" type="submit" value="Submit" >
</div>
</fieldset>
</form>
<script src="contactform.js"></script>
</body>
</html>
This is my Javascript
function onSubmit(){
console.log("ive been submitted");
checkEmpty(document.getElementById('fname'),document.getElementById("fname-error"));
checkEmpty(document.getElementById('lname'),document.getElementById("lname-error"));
checkEmpty(document.getElementById('healthauthoritynumber'),document.getElementById("hn-error"));
checkEmpty(document.getElementById('email'),document.getElementById("email-error"));
checkEmpty(document.getElementById('telephone'),document.getElementById("tele-error"));
//checkValidHealthID(document.getElementById('healthauthoritynumber'),document.getElementById("hn-error"));
}
// Read about regular expressions using: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions
// and http://stackoverflow.com/questions/25155970/validating-uk-phone-number-regex-c
function checkValidHealthID(inputID, errorID){
var re = new RegExp('/ZHA\d{6}$/');
if((inputID.value)!== re){
errorID.style.display = "inline";
}else
{
errorID.style.display = "none";
}
}
function checkEmpty(inputID, errorID){
//Default behaviour at for FORM is to reload the HTML page
//e.preventDefault();
console.log("checking empty");
if((inputID.value === "") || (inputID.value.length === 0)){
console.log("empty!!");
errorID.style.display = "inline";
}
else
{
errorID.style.display = "none";
}
}
function textHint(txtElem, defaultText) {
txtElem.value = defaultText;
txtElem.style.color = "#A8A8A8";
txtElem.style.fontStyle = "italic";
txtElem.onfocus = function() {
if (this.value === defaultText) {
this.value = "";
this.style.color = "#000";
this.style.fontStyle = "normal";
}
}
txtElem.onblur = function() {
if (this.value === "") {
this.value = defaultText;
this.style.color = "#A8A8A8";
this.style.fontStyle = "italic";
}
}
}
function textHints() {
//textHint(document.getElementById("firstName"), "Enter your first name");
textHint(document.getElementById('lname'), "Enter your last name");
textHint(document.getElementById('healthauthoritynumber'), "for eg
,ZHA346783");
textHint(document.getElementById('email'), "Enter your email");
textHint(document.getElementById('telephone'), "Enter your telephone
number");
}
function switchToolTip() {
document.getElementById('qmark').onmouseover = function() {
var toolTip = document.getElementById('ttip');
toolTip.style.display='block';
}
document.getElementById('qmark').onmouseout = function() {
var toolTip = document.getElementById('ttip');
toolTip.style.display='none';
}
}
//windows.onload=textHints();
//windows.onload=switchToolTip();
//window.onload=init;
document.getElementById("submit-button").onclick = onSubmit;

Your form is getting submitted which results in page reload. That's why you see the message flashing for a while. I saw the commented line in your JavaScript
//Default behaviour at for FORM is to reload the HTML page
//e.preventDefault();
You should get uncomment e.preventDefault().
Grab the click event as function onSubmit(event) and pass the event to checkEmpty.

HTML Validation JS without using PHP

I made an application for people to fill out an application. I did some of the in form validation but now I want to ensure that when the user hits the submit button it checks to ensure that all field are filled out. I am stuck and cannot figure out the last part of this puzzle.
I believe all I need to make this work is a Application.js If someone could take a look at this and let me know what if anything I am missing. I did not include the CSS sheet or photos. Thank you for taking the time to help.
Here is the form. "Application.html"
<!DOCTYPE html>
<html>
<head>
<center><h1>AIFC Application Form</h1></center>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<title>AIFC Application</title>
<meta charset="utf-8">
<meta name="author" content="Paul Skinner">
<link rel="stylesheet" type="text/css" href="Application.css" />
<style type="text/css">
</style>
<script src="Application.js"></script>
<script src="Application_Library.js"></script>
<script type="text/javascript">
function updateTotal() {
var basePrice = 50;
var optionsPrice = 0;
var memberPrice = 0;
function checkPayment() {
if (document.getElementById('payment0').checked) {
optionsPrice += 1;
}
if (document.getElementById('payment1').checked) {
optionsPrice += 9.6;
}
} // end of checking for payment
function checkJumper() {
if (document.getElementById('jumper0').checked) {
optionsPrice += 0;
}
if (document.getElementById('jumper1').checked) {
optionsPrice += 4.4;
}
} // end of checking for Jumper
function checkMembership() {
if (document.getElementById('membership').value == 'Basic') {
memberPrice += 75;
}
if (document.getElementById('membership').value == 'Silver') {
memberPrice += 125;
}
if (document.getElementById('membership').value == 'Gold') {
memberPrice += 150;
}
} // end of check membership function
checkPayment();
checkJumper();
checkMembership();
var totalPrice = basePrice + (optionsPrice * memberPrice);
document.getElementById('optionsPrice').innerHTML = optionsPrice;
document.getElementById('memberPrice').innerHTML = "$ " + memberPrice;
document.getElementById('totalPrice').innerHTML = "$ " + totalPrice;
}
</script>
</head>
<body>
<div id="top">
<nav class="horizontalNav">
<ul>
<li>Home</li>
<li>Application</li>
<li>Who We Are</li>
<li>Our Packages</li>
</ul>
</nav></div>
<section>
<table>
<tr style="white-space:nowrap; clear:both">
<td><img src="Images/girl punching.jpg" alt="Girl Punching" style=" float:left; height:200px" /></td>
<td><img src="images/fitness.jpg" alt="Weights" style=" float:right; height:200px; width:900px" /></td>
</tr>
</table>
</section>
<form action="#" method="get" name="application" id="application" >
<div id="form">
<fieldset>
<legend>Payment Type</legend><br>
<input type="radio" name="payment" id="payment0" value="payment0" onchange="updateTotal()"> Monthly membership <br>
<input type="radio" name="payment" id="payment1" value="payment1" onchange="updateTotal()"> Yearly membership <b>Big Savings!</b> <br><br>
</fieldset>
<fieldset>
<legend>Choose a Location</legend><br>
<input type="radio" name="jumper" id="jumper0" value="jumper0" onchange="updateTotal()"> Single Gym location
<input type="radio" name="jumper" id="jumper1" value="jumper1" onchange="updateTotal()"> All Locations <br><br>
</fieldset>
<fieldset>
<legend>Membership Type</legend><br>
<select name="membership" id="membership" onchange="updateTotal()">
<option value="Basic">Basic Membership ($75)</option>
<option value="Silver">Silver Membership ($125)</option>
<option value="Gold">Gold Membership ($150)</option><br>
</select>
</fieldset>
<fieldset>
<legend>Sex</legend><br>
<input type="radio" name="sex" value="male">Male<br>
<input type="radio" name="sex" value="female">Female<br>
</fieldset>
</div>
<div id="prices">
<table>
<tr><td>Membership Application Fee</td><td id="basePrice">$50</td></tr>
<tr><td>Option factor</td><td id="optionsPrice"></td></tr>
<tr><td>Membership</td><td id="memberPrice"></td></tr>
<tr><td>Total</td><td id="totalPrice"></td></tr>
</table>
</div>
<div id="info">
<fieldset>
<legend>Personal Information</legend>
<label for="first_name">First Name:</label>
<input type="text" id="firstname" name="first" required autofocus title="First Name" placeholder="First Name" />
<span id="first_name_error"> </span><br>
<label for="last_name">Last Name:</label>
<input type="text" id="lastname" name="last" required title="Last Name" placeholder="Last Name"/>
<span id="last_name_error"> </span><br>
<label for="address">Address:</label>
<input type="text" id="address" name="address" required title="Address" placeholder="Address"/>
<span id="address_error"> </span><br>
<label for="city">City:</label>
<input type="text" id="city" name="city" required title="City" placeholder="City"/>
<span id="city_error"> </span><br>
<label for="state">State:</label>
<input type="text" id="state" maxlength="2" name="State" required title="State" placeholder="State"/>
<span id="state_error"> </span><br>
<label for="zip_code">Zip Code:</label>
<input type="text" id="zip" name="zip" required title="Zip Code" placeholder="Zip Code" pattern="\d{5}([\-]\d{4})?"/>
<span id="zip_error"> </span><br>
<label for="phone_number">Phone Number:</label>
<input type="text" id="phone" name="phone" required title="Optional Phone Number 999-999-9999" placeholder="999-999-9999" pattern="\d{3}[\-]\d{3}[\-]\d{4}"/>
<span id="phone_error"> </span><br>
<label for="date_of_birth">Date of Birth:</label>
<input type="date" name="date" required title="MM-DD-YYYY"/>
<span id="date_error"> </span><br>
<label for="email">Email:</label>
<input type="email" id="email" name="email" required title="Email" placeholder="Email Address"/>
<span id="email_error"> </span>
<br>
</fieldset>
<br><br><center><input type="submit" id="submit" value="Become a Member"></center>
<br><center><input type="Reset" id="btn1" value="Reset Form"></center>
</div>
<br><br><div class="footer">
<address><center>
<b>American InterContinental Fitness Center</b> ☀
1578 Perseverance Lane ☀
Simple City, IL 60001
<br/> (630)432-1425
</address></center>
<br>
</div>
</form>
</body>
</html>
The next is the js: "Application_Library.js"
var $ = function (id) { return document.getElementById(id); }
var application = function () {
// All the different fields
this.field = [];
this.field["first_name"] = {};
this.field["last_name"] = {};
this.field["address"] = {};
this.field["city"] = {};
this.field["state"] = {};
this.field["zip"] = {};
this.field["phone"] = {};
this.field["date"] = {};
this.field["email"] = {};
// Field messages
this.field["state"].message = "Please use only a two letter State abbreviation.";
this.field["zip"].message = "Please use a 5 or 9 digit Zip Code";
this.field["phone"].message = "Please use 123-456-7890 format.";
this.field["email"].message = "Must be a vaild email address.";
// Error messages
this.field["email"].required = "Email is required";
this.field["confirmemail"].required = "Please confirm your email!";
this.field["confirmemail"].noMatch = "Emails do not Match!", "email";
this.field["first_name"].required = "First names are required.";
this.field["last_name"].required = "Last names are required.";
this.field["address"].required = "An Address is required";
this.field["city"].required = "A City is required";
this.field["state"].required = "A State is required";
this.field["state"].isState = "State invalid";
this.field["zip"].required = "A Zip code is required.";
this.field["zip"].isZip = "Zip code is invalid";
this.field["phone"].required = "A phone number is required";
this.field["phone"].isPhone = "The phone number is invalid";
this.field["date"].required = "Your date of birth is required";
}

Instead of writing your own javascript validation you can use the jQuery "form Validation Plug-in", which is an excellent tool for web pages to validate data entries at the client side using JavaScript. It's very simple to use.
Here is a sample tutorial
http://www.codeproject.com/Articles/213138/An-Example-to-Use-jQuery-Validation-Plugin
You should implement server side validation also for best security.

You can't just check data on JavaScript, you should also check it on server-side, because the client side is more accessible and user can change the JavaScript or even disable it, so the data would be invalidated.
You should write server-side validation too.
You forgot to show the Application.js file.
Also you can use HTML5 validation, without using any JavaScript:
http://www.sitepoint.com/html5-form-validation/