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Form Validation in JQuery Mobile

I'm trying to add validation to the form I made
<fieldset>
<legend>ENTER YOUR INFORMATION HERE FOR DELIVERY</legend>
<form action="" name="deliveryform">
Name* :<input type="text" name="name" id="name">
Phone Number* : <input type="text" name="phonenumber" id="phonenumber">
<span id="warning1"></span>
Address* : <textarea name="address" id="address" required></textarea>
Email* : <input type="text" name="email" id="email">
<span id="warning2"></span>
<input type="submit" id="submitbutton" value="Submit" onsubmit=" return validation()">
</form>
</fieldset>
Javascript
function validation()
{
var name = document.getElementsByName("name").value;
var phonenumber =document.getElementsByName("phonenumber").value;
var email = document.getElementById("email").value;
var emailformat = "[a-z0-9._%+-]+#[a-z0-9.-]+\.[a-z]{2,}$";
if(name == ""|| null)
{
alert("Please Enter Your Name!");
return false;
}
if(isNaN (phonenumber))
{
document.getElementById("warning1").innerHTML ="Enter numbers only";
return false;
}
if(!email.match(emailformat))
{
document.getElementById("warning2").innerHTML="Please enter the correct format. Example : Abc1234#gmail.com"
return false;
}
else
{
alert("Submitted Successfully")
}
}
Nothing changed except ''Error Loading Page '' message appeared.
Did I miss something?
I thought coding in without and with Jquery in HTML is the same thing..

The onsubmit event handler javascript not working

I have a problem. When I clicked the submit button nothing happens, even when I filled out the username and password with numbers (I don't want the username and password contains any number so I did make the condition for it), there is no alert display. I do not know where the problem comes from? Can you guys help me with this
Note: the reset function works fine
function validateInput() {
var firstName = document.forms["sign_up"]["firstName"];
var lastName = document.forms["sign_up"]["lastName"];
var email = document.forms["sign_up"]["email"];
var reg = /^[a-zA-Z]+$/;
if (firstName.value !== '' || lastName.value !== '' || email.value !== '') {
if (firstName.value.match(reg) && lastName.value.match(reg)) {
alert("Form is submitted");
// return true;
return false; // for the demo, so it doesn't submit
} else {
if (firstName.value.match(reg) === false) {
document.getElementById("error").innerHTML = "Numbers are not allowed in username";
return false;
} else if (lastName.value.match(reg) === false) {
document.getElementById("error").innerHTML = "Numbers are not allowed in password";
return false;
}
}
}
}
function reset() {
document.getElementById("first").innerHTML = "";
document.getElementById("last").innerHTML = "";
document.getElementById("email").innerHTML = "";
}
<form id="sign_up" onsubmit="return validateInput()">
<p id="error"></p>
<label for="firstName">First Name</label>
<input type="text" id="firstName" value="" placeholder="Enter your first name">
<label for="lastName">Last Name</label>
<input type="text" id="lastName" value="" placeholder="Enter your last name">
<label for="email">Email</label>
<input type="email" id="email" value="" placeholder="Enter your email">
<button type="submit">Submit</button>
<button type="button" onclick="reset();">Cancel</button>
</form>

Use the Pattern attribute in input for validation like below
<input type="text" id="firstName" value="" pattern="[^0-9]*" title="Numbers are not allowed" placeholder="Enter your first name">
for more references: https://www.w3schools.com/tags/att_input_pattern.asp
And for reset functionality use reset
<input type="reset" value="reset">
It's better than create a special function for it and it saves your number of lines:-)

First, try to avoid to inline event handlers as they are not rec-emended at all. Also to reset form values you can simply use reset() method on the form.
Also, do not use innerHTML just to set the text of your error. You can use textContent instead which is better fit in your example.
You can use addEventListener with submit event to check for validation on your firstname and lastname.
I have fixed your code and its all working as expected.
Live Working Demo:
let form = document.getElementById("sign_up")
var firstName = document.getElementById("firstName")
var lastName = document.getElementById("lastName")
var email = document.getElementById("email")
var reset = document.getElementById("clearValues")
var reg = /^[a-zA-Z]+$/;
form.addEventListener('submit', function(e) {
e.preventDefault()
if (firstName.value != '' || lastName.value != '' || email.value != '') {
if (firstName.value.match(reg) && lastName.value.match(reg)) {
alert("Form is submitted");
} else if (!firstName.value.match(reg)) {
document.getElementById("error").textContent = "Numbers are not allowed in username";
} else if (!lastName.value.match(reg)) {
document.getElementById("error").textContent = "Numbers are not allowed in password";
}
}
})
reset.addEventListener('click', function(e) {
document.getElementById("sign_up").reset();
})
input {
display:block;
}
<head>
</head>
<body>
<form id="sign_up" action="#">
<p id="error"></p>
<label for="firstName">First Name</label>
<input type="text" id="firstName" value="" placeholder="Enter your first name">
<label for="lastName">Last Name</label>
<input type="text" id="lastName" value="" placeholder="Enter your last name">
<label for="email">Email</label>
<input type="email" id="email" value="" placeholder="Enter your email">
<button type="submit">
Submit
</button>
<button type="button" id="clearValues" onclick="reset();">
Cancel
</button>
</form>
</body>

You don't need to return a function in onsubmit event. This should work fine.
<form id="sign_up" onsubmit="validateInput()">
Reference:
https://www.w3schools.com/jsref/event_onsubmit.asp

Form validation not working in chrome nor firefox

Im working with this contact form.
<form name="contact" action="mailto:me#me.com&subject=subject&body=message"
onsubmit="return validate()" method="post" enctype="text/plain">
<label for="mail">Your mail address *</label>
<input type="text" name="mail"/></br></br>
<label for="subject">Subject *</label>
<input type="text" name="subject"/></br>
<label for="message">Your message *</label>
<textarea id="txtarea" name="message" form="contact"></textarea>
<input type="submit" value="Send"/>
</form>
And this javascript
function validateMail(mail) {
var re = /^(([^<>()[\]\\.,;:\s#\"]+(\.[^<>()[\]\\.,;:\s#\"]+)*)| (\".+\"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(mail);
}
function validate(){
var x = document.forms["contact"];
if (x[0].value == null || x[0].value == ""){
alert("Your mail address");
return false;
}else{
if(!validateMail(x[0].value)){
alert("mail address not valid");
return false;
}
}
if(x[1].value == null || x[1].value == ""){
alert("Add a subject");
return false;
}
if(x['txtarea'].value.length < 1 || x['txtarea'].value == '' || x['txtarea'].value == null){
alert("Add your message");
return false;
}
}
This code works perfectly on IE11 (11.0.9600.18500) but chrome 54.0.2840.71 m (64-bit) and FF 49.0.2 just ignore my javascript and proceed to send the mail with empty fields or not valid info.
PS: im using id for the textarea since i cant find it with the form[#] option
Edit: I found that IE properly identifies the textarea as [object HTML TextAreaElement] but for both chrome and firefox is undefined

The problem is with your textarea, remove form="contact" from it. You can use the below form -
<form name="contact" action="mailto:me#me.com&subject=subject&body=message" onsubmit="return validate()" method="post" enctype="text/plain">
<label for="mail">Your mail address *</label>
<input type="email" name="mail" /></br>
</br>
<label for="subject">Subject *</label>
<input type="text" name="subject" /></br>
<label for="message">Your message *</label>
<textarea id="txtarea" name="message"></textarea>
<input type="submit" value="Send" />
</form>
And here is little optimized Javascript function for your form-
function validateMail(mail) {
var re = /^(([^<>()[\]\\.,;:\s#\"]+(\.[^<>()[\]\\.,;:\s#\"]+)*)| (\".+\"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(mail);
}
function validate() {
var x = document.forms["contact"];
if (!x[0].value) {
alert("Your mail address");
return false;
} else {
if (!validateMail(x[0].value)) {
alert("mail address not valid");
return false;
}
}
if (!x[1].value) {
alert("Add a subject");
return false;
}
if (!x['txtarea'].value) {
alert("Add your message");
return false;
}
}

Managed to solve it by using:
if(document.getElementById('txtarea').value.length < 1 || document.getElementById('txtarea').value == '' || document.getElementById('txtarea').value == null)
instead of:
if(x['txtarea'].value.length < 1 || x['txtarea'].value == '' || x['txtarea'].value == null)
since neither chrome or firefox can properly process form['id']

Submitting a PHP form with onClick

So I currently have a download link and an input field for an email address on my website.
In order to download the file you first need to put in your email.
I use a form to do this, with the email field being an input field and the download button being a submit button.
I like HTML5's form validation (the required fields, field types etc, it all looks very nice).
The problem is that if I use onClick in my submit button then none of the nice form validation works.
<form>
<input type="email" id="email" placeholder="Please enter email" required>
<input type="submit" class="btn" onclick="downloadWin()" value="Windows">
<input type="submit" class="btn" onclick="downloadOsx()" value="Osx">
</form>
<script>
function downloadWin(){
event.preventDefault();
var email = $("#email").val();
if(email != ''){
if(validateEmail(email)){
location.href='http://s/index.php?page=downloadWin&email='+email;
}
}
}
function downloadOsx(){
event.preventDefault();
var email = $("#email").val();
if(email != ''){
if(validateEmail(email)){
location.href='http://s/index.php?page=downloadOsx&email='+email;
}
}
}
</script>
This might not be the cleanest way to do it, so please if you think you know a better way tell me :)

Try this:
<form onsubmit="download(this.email.value,this.system.value)" id="form">
<input type="email" id="email" name="email" placeholder="Please enter email" required>
<input type="radio" name="system" value="Win" required >Windows
<input type="radio" name="system" value="Osx" >Osx
<input type="submit" class="btn" value="Download">
</form>
<script type="text/javascript">
document.getElementById("form").addEventListener("submit", function(event){
event.preventDefault();
});
function download(email_value,sys_value){
location.href='http://s/index.php?page=download'+sys_value+'&email='+email_value;
}
</script>
Result:

try this code
function validateEmail(email) {
var re = /^(([^<>()\[\]\\.,;:\s#"]+(\.[^<>()\[\]\\.,;:\s#"]+)*)|(".+"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(email);
}
function downloadWin() {
var email = $("#email").val();
if (email != '') {
if (validateEmail(email)) {
location.href = 'http://s/index.php?page=downloadWin&email=' + email;
}
}
return false;
}
function downloadOsx() {
var email = $("#email").val();
if (email != '') {
if (validateEmail(email)) {
location.href = 'http://s/index.php?page=downloadOsx&email=' + email;
}
}
return false;
}

Below is the working code snippet (without using HTML5 validation). You can run and test it. I have used the jquery with jquery.validate plugin. You can uncomment the commented code to redirect user to the target url. Let us know if this what you are looking for or not. Feel free to comment if there is anything that you feel confusing.
$(document).ready(function(){
$(".btn-download").on("click", function(e) {
e.preventDefault();
e.stopImmediatePropagation();
if ($("#validateForm").valid()) {
var name = $(this).val();
var email = $("#email").val();
if (name === "Windows") {
//location.href = 'http://s/index.php?page=downloadWin&email=' + email;
console.log('http://s/index.php?page=downloadWin&email=' + email);
}
if (name === "Osx") {
console.log('http://s/index.php?page=downloadOsx&email=' + email);
//location.href = 'http://s/index.php?page=downloadOsx&email=' + email;
}
}
});
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.1/jquery.validate.min.js"></script>
<form method="post" action="" id="validateForm" novalidate>
<input type="email" id="email" placeholder="Please enter email" required>
<input type="submit" name="btnSubmit" class="btn btn-download" value="Windows">
<input type="submit" name="btnSubmit" class="btn btn-download" value="Osx">
</form>

Submitting Form W/ Javascript

My javascript form validation is working correctly. I want it so that when the form is valid, it will go to a different page. I am having trouble with that part. I tried using the document object to submit it if everything is valid but its not working
Javascript:
function func(){
var first = document.getElementById('fname').value;
var last = document.getElementById('lname').value;
var email = document.getElementById('mail').value;
var phone = document.getElementById('phone').value;
var val_phone = /^\(\d{3}\)\d{3}-\d{4}$/;
var val_mail = /^\w+#[a-zA-Z_]+?\.[a-zA-Z]{2,3}$/;
if ( first == "" || last == "" || email == "" || phone == "")
{
alert("Do not Leave Any Blank Answers");
return;
}
if ( phone != phone.match(val_phone) || email != email.match(val_mail) )
{
alert("Incorrect Format! \n Please Check Email and Phone Number! ");
return;
}
else {
document.forms["survey"].sumbit();
}
}
HTML:
<form id="survey" name="survey" action="SlideShow.html" method="post">
First Name:<br>
<input type="text" id="fname" name="fname" required="required"><br>
Last Name:<br>
<input type="text" id="lname" name="lname" required="required"><br>
Email:<br>
<input type="email" id="mail" name="mail" required="required"><br>
Phone Number:<br>
<input type="text" id="phone" name="phone" required="required"><br><br>
<input type="button" value="Submit" onclick="func()">
</form>

Your else block is calling sumbit(), but the proper spelling is submit().
Additionally, I recommend getting in the habit of a strict === check as opposed to a ==.
Here's a JSFiddle with the updated and refactored code:
http://jsfiddle.net/cyeof94g/