Develop Reference

How to display form validation error messages accurately for more than two input fields using only JavaScript?

I have created a JavaScript function that checks a form during submitting the input and displays an error message if there's no input.
It works perfectly when none input is given. It displays all the error messages correctly.
The Problem: But if I leave just the first field blank i.e, the fullname; the if loop stops there and doesn't display the second or third error messages i.e, the streetaddr & quantity.
NOTE: This error happens only when one of streetaddr or quantity is not given with addition to the first field i.e, fullname.
What should I do to display the error messages correctly. According to the blank input regardless the input field comes first or second or third.
Also, I prefer to do this with just Vanilla JavaScript, no frameworks/libraries. I'm trying to learn!
Link(s): This is a challenge from Wikiversity
/* Checking form function */
function checkForm(){
window.alert("You clicked Submit!");
var fullNameCheck = document.getElementById("fullname");
var addressCheck = document.getElementById("streetaddr");
var quantityCheck = document.getElementById("quantity");
var is_valid = false;
/* If statements to check if text box is empty */
if (fullNameCheck.value=="" && addressCheck.value=="" && quantityCheck.value=="") {
document.getElementById("nameerrormsg").style.display="inline";
document.getElementById("addrerrormsg").style.display="inline";
document.getElementById("qtyerrormsg").style.display="inline";
is_valid = false;
} else if(fullNameCheck.value==""){
document.getElementById("nameerrormsg").style.display="inline";
document.getElementById("addrerrormsg").style.display="none";
document.getElementById("qtyerrormsg").style.display="none";
is_valid = false;
} else if (addressCheck.value==""){
document.getElementById("addrerrormsg").style.display="inline";
document.getElementById("nameerrormsg").style.display="none";
document.getElementById("qtyerrormsg").style.display="none";
is_valid = false;
} else if (quantityCheck.value==""){
document.getElementById("qtyerrormsg").style.display="inline";
document.getElementById("nameerrormsg").style.display="none";
document.getElementById("addrerrormsg").style.display="none";
is_valid = false;
} else {
document.getElementById("nameerrormsg").style.display="none";
document.getElementById("addrerrormsg").style.display="none";
document.getElementById("qtyerrormsg").style.display="none";
is_valid = true;
} return is_valid;
}
.errormsg{
color: red;
background-color: yellow;
display: none;
}
<form action="mailto:me#fakeemail.com" onsubmit="return checkForm();">
<fieldset>
<legend>Personal details</legend>
<p>
<label>
Full name:
<input type="text" name="fullname" id="fullname">
</label>
</p>
<p class="errormsg" id="nameerrormsg">Please enter your name above</p>
<p>
<label>
Street Address:
<input type="text" name="streetaddr" id="streetaddr">
</label>
</p>
<p class="errormsg" id="addrerrormsg">Please enter your street address</p>
<!-- Quantity input -->
<p>
<label>
Quantity:
<input type="text" name="quantity" id="quantity">
</label>
</p>
<p class="errormsg" id="qtyerrormsg">Please enter your quantity</p>
</fieldset>
<input type="submit" value="Submit it!">
</form>

I'd prefer to just make the fields required, no Javascript needed:
<form action="mailto:me#fakeemail.com" onsubmit="return checkForm();">
<fieldset>
<legend>Personal details</legend>
<p>
<label>
Full name:
<input type="text" name="fullname" id="fullname" required>
</label>
</p>
<p>
<label>
Street Address:
<input type="text" name="streetaddr" id="streetaddr" required>
</label>
</p>
<!-- Quantity input -->
<p>
<label>
Quantity:
<input type="text" name="quantity" id="quantity" required>
</label>
</p>
</fieldset>
<input type="submit" value="Submit it!">
</form>
Otherwise, you can first hide all the error messages. Iterate over all inputs in the form, and if invalid (missing), navigate to its ancestor p and then to the adjacent .errormsg and set its display.
It would also be a good idea to avoid inline handlers entirely, they have too many problems to be worth using. Attach listeners properly using addEventListener in Javascript instead.
document.querySelector('form').addEventListener('submit', () => {
for (const errormsg of document.querySelectorAll('.errormsg')) {
errormsg.style.display = 'none';
}
let valid = true;
for (const input of document.querySelectorAll('form input')) {
if (input.value) {
// valid
continue;
}
valid = false;
input.closest('p').nextElementSibling.style.display = 'inline';
}
return valid;
});
.errormsg{
color: red;
background-color: yellow;
display: none;
}
<form action="mailto:me#fakeemail.com">
<fieldset>
<legend>Personal details</legend>
<p>
<label>
Full name:
<input type="text" name="fullname" id="fullname">
</label>
</p>
<p class="errormsg" id="nameerrormsg">Please enter your name above</p>
<p>
<label>
Street Address:
<input type="text" name="streetaddr" id="streetaddr">
</label>
</p>
<p class="errormsg" id="addrerrormsg">Please enter your street address</p>
<!-- Quantity input -->
<p>
<label>
Quantity:
<input type="text" name="quantity" id="quantity">
</label>
</p>
<p class="errormsg" id="qtyerrormsg">Please enter your quantity</p>
</fieldset>
<input type="submit" value="Submit it!">
</form>

You could hide all the error text as initially. Then show the error text based on respected input failure
/* Checking form function */
function checkForm() {
window.alert("You clicked Submit!");
var fullNameCheck = document.getElementById("fullname");
var addressCheck = document.getElementById("streetaddr");
var quantityCheck = document.getElementById("quantity");
var is_valid = false;
/* If statements to check if text box is empty */
document.getElementById("nameerrormsg").style.display = "none";
document.getElementById("addrerrormsg").style.display = "none";
document.getElementById("qtyerrormsg").style.display = "none";
is_valid = true;
if (fullNameCheck.value == "") {
document.getElementById("nameerrormsg").style.display = "inline";
is_valid = false;
}
if (addressCheck.value == "") {
document.getElementById("addrerrormsg").style.display = "inline";
is_valid = false;
}
if (quantityCheck.value == "") {
document.getElementById("qtyerrormsg").style.display = "inline";
is_valid = false;
}
return is_valid;
}
.errormsg {
color: red;
background-color: yellow;
display: none;
}
<form action="mailto:me#fakeemail.com" onsubmit="return checkForm();">
<fieldset>
<legend>Personal details</legend>
<p>
<label>
Full name:
<input type="text" name="fullname" id="fullname">
</label>
</p>
<p class="errormsg" id="nameerrormsg">Please enter your name above</p>
<p>
<label>
Street Address:
<input type="text" name="streetaddr" id="streetaddr">
</label>
</p>
<p class="errormsg" id="addrerrormsg">Please enter your street address</p>
<!-- Quantity input -->
<p>
<label>
Quantity:
<input type="text" name="quantity" id="quantity">
</label>
</p>
<p class="errormsg" id="qtyerrormsg">Please enter your quantity</p>
</fieldset>
<input type="submit" value="Submit it!">
</form>

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>

My Jquery does not connect to my html

my jquery is not connecting and I cannot figure out why. I've been stumped on this for hours and I cannot figure it out.
this is my html code. The file name is exercise6.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Exercise 6</title>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script type="text/javascript" src="JS/exercise6.js"> </script>
</head>
<body>
<form id="email_form" name="email_form" action="exercise6.html" method="get">
<fieldset class="info">
<legend>Contact Information</legend>
<p>
<input type="text" name="Lname" id="name2" value="" required />
<label for="name2"> Last</label>
</p>
<p>
<input type="text" name="mailAddie" id="mail1" value="" required />
<label for="mail1"> Address</label>
</p>
<p>
<input type="text" name="City" id="city1" value="" />
<label for="city1"> City</label>
</p>
<p>
<input type="text" name="State" id="state1" value="" />
<label for="state1"> State</label>
</p>
<p>
<input type="number" name="Zip" id="zip1" value="" />
<label for="zip1"> Zip</label>
</p>
<p>
<input type="number" name="phoneNum" id="number" />
<label for="number"> Phone</label>
</p>
</fieldset>
<fieldset>
<legend>Sign up for our email list</legend>
<p>
<label for="email_address1"> Email Address</label>
<input type="text" name="email_address1" id="email_address1" value="" />
<span>*</span><br>
</p>
<p>
<label for="email_address2"> Confirm Email Address</label>
<input type="text" name="email_address2" id="email_address2" value="" />
<span>*</span><br>
</p>
<p>
<label for="first_name"> First</label>
<input type="text" name="first_name" id="first_name" value="" />
<span>*</span><br>
</p>
</fieldset>
<p>
<label> </label>
<input type="submit" value="Join Our List" id="join_list" >
</p>
</form>
</body>
</html>
and this is my javascript. The file name is exercise6.js and it is located in a file named JS. I do not know what I am doing wrong.
$(document).ready(function() {
$("#join_list").click(function() {
var emailAddress1 = $("#email_address1").val();
var emailAddress2 = $("#email_address2").val();
var isValid = true;
if (emailAddress1 == "") {
$("#email_address1").next().text("This field is required.");
isValid = false;
} else {
$("#email_address1").next().text("");
}
if (emailAddress2 == "") {
$("#email_address2").next().text("This field is required.");
isValid = false;
} else {
$("#email_address2").next().text("");
}
if ($("#first_name").val() == "") {
$("#first_name").next().text("This field is required.");
isValid = false
} else {
$("#first_name").next().text("");
}
if (isValid) {
$("#email_form").submit();
}
)};
)};
Can anyone help me?

The last two lines of exercise6.js both have a syntax error.
Change:
)};
)};
To:
});
});
To find this yourself next time, try using web development IDE like NetBeans with the help of right click with mouse to inspect in browser debug console, which would have even shown you where is this kind of error.

Your js code has some errors for close the function "});" try this
$(document).ready(function() {
$("#join_list").click(function() {
var emailAddress1 = $("#email_address1").val();
var emailAddress2 = $("#email_address2").val();
var isValid = true;
if (emailAddress1 == "") {
$("#email_address1").next().text("This field is required.");
isValid = false;
} else {
$("#email_address1").next().text("");
}
if (emailAddress2 == "") {
$("#email_address2").next().text("This field is required.");
isValid = false;
} else {
$("#email_address2").next().text("");
}
if ($("#first_name").val() == "") {
$("#first_name").next().text("This field is required.");
isValid = false
} else {
$("#first_name").next().text("");
}
if (isValid) {
$("#email_form").submit();
}
});
});

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/

Javascript form validation - can't validate multiple fields

I am trying to get a form with multiple fields validate when the submit button is pressed.
If a field is invalid then a message appears next to the field. I can get one of the invalid messages to appear but not all of them. The function I am using is below.
function checkForm() {
document.getElementById("test").onsubmit=function(){
var title = document.getElementById("titles");
if (title.selectedIndex == -1) {
return null;
}
var email = document.getElementById('email');
//Regular Expression for checking email
var emailRegEx = /[-\w.]+#([A-z0-9][-A-z0-9]+\.)+[A-z]{2,4}/;
if (!emailRegEx.test(email.value)) {
document.getElementById("errEmail").style.display="inline";
return false;
}
if(document.getElementById("fname").value==""){
document.getElementById("errfName").style.display="inline";
return false;
}
else {
return true;
}
if(document.getElementById("lname").value==""){
document.getElementById("errlName").style.display="inline";
return false;
}
else {
return true;
}
}
}
html below
<form name ="reg" id="test">
<fieldset id="controls">
<div>
<label for="title">Title: </label>
<select id="titles">
<option value="mr" selected="selected">Title</option>
<option value="mr">Mr.</option>
<option value="mrs">Mrs.</option>
<option value="ms">Ms.</option>
<option value="miss">Miss</option>
</select>
</div>
<div>
<label for="fname">First Name: </label>
<input id="fname" type="text"><span id="errfName" class="error">* Please Enter a First Name</span>
</div>
<div>
<label for="lname">Last Name: </label>
<input id="lname" type="text"><span id="errlName" class="error">* Please Enter a Last Name</span>
</div>
<div>
<label for="email">Email: </label>
<input id="email" type="text" size="40"><span id="errEmail" class="error">* Please enter a valid email</span>
</div>
<div>
<input type="submit" value="submit">
</div>
</fieldset>
</form>
</body>
</html>

try this:
function checkForm() {
var errors = [];
document.getElementById("test").onsubmit=function(){
var title = document.getElementById("titles");
if (title.selectedIndex == -1) {
return null;
}
var email = document.getElementById('email');
//Regular Expression for checking email
var emailRegEx = /[-\w.]+#([A-z0-9][-A-z0-9]+\.)+[A-z]{2,4}/;
if (!emailRegEx.test(email.value)) {
errors.push("errEmail");
}
if(document.getElementById("fname").value==""){
errors.push("errfName");
}
if(document.getElementById("lname").value==""){
errors.push("errlName");
}
if(errors.length > 0 ){
for(var i=0;i<errors.length;i++){
document.getElementById(errors[i]).style.display="inline";
}
return false;
}else{
return true
}
}
}