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HTML Form Submits Even After Setting OnSubmit To False

I have a form that I can't get to stop submitting, no matter what. I've looked at some similar questions on SO but none have worked for me. This seems like such a simple task. The reason why I need it to stop submitting is because I would like to add some validation if a field is left empty.
HTML
<form class="application-form" id="application-form" name="application-form"
autocomplete="off" enctype="multipart/form-data" method="post" onsubmit="return validateForm()" action="AppProcessRequest.cshtml">
...
...
...
<!-- Verify/Submit -->
<input type="submit" value="Submit" id="btnSubmit" name="submitButton"/>
</form>
JavaScript
function validateForm() {
alert('False');
return false;
};
My Ideal Pseudo-Script
function validateForm() {
var emp1label = $('label[class=emp1label]')
if(emp1label.length > 0){
alert('Empty Field.');
return false;
}else{
return true;
}
};
Note: The alert does popup when clicking submit, but the form still posts after closing the message.

You have to use preventDefault() to prevent the default action.
function validateForm(evt) {
evt.preventDefault();
alert('False');
return false;
};

The problem might be in the new line between return and validateForm():
function validateForm() {
alert('False');
return false;
};
<form class="application-form" id="application-form" name="application-form"
autocomplete="off" enctype="multipart/form-data" method="post" onsubmit="return validateForm()" action="AppProcessRequest.cshtml">
...
...
...
<!-- Verify/Submit -->
<input type="submit" value="Submit" id="btnSubmit" name="submitButton"/>
</form>

The reason why the form was still being submitted was because of jquery-validation having it's own submit function. This was overriding any changes that I made to try and stop the submit.

Submit a form if the statement is true

I am trying to write a very simple jQuery function which will have two main properties. The first one will be to check if the field is empty or not. The second one will be if the field is not empty to execute a form which will lead to a PHP coded page. I am very new to jQuery and I will be very grateful if someone can point where exactly is my mistake. Thank you in advance.
function Captcha() {
$('#Button').click(function() {
if ($("#Field").val().length == 0) {
alert("Please fill the box");
return false;
} else {
alert("Your code is saved");
return true;
}
});
}
$(document).ready(function() {
Captcha();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="success.php" id="Alpha" method="post" onsubmit="return Captcha();">
<input id="Field" type="text" placeholder="Enter key here">
<button id="Button" type="submit" form="Alpha">Confirm</button>
</form>

Don't work with the button's click event, work with the form's submit event because a form can be submitted via the keyboard and therefore the button can be circumvented.
You can see a working version here (Stack Overflow prevents submit code from working in the snippet environment below.)
$(function() {
$('#Alpha').on("submit", function() {
if ($("#Field").val().length == 0) {
alert("Please fill the box");
return false;
} else {
alert("Your code is saved");
return true;
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="success.php" id="Alpha" method="post" onsubmit="return Captcha();">
<input id="Field" type="text" placeholder="Enter key here">
<button id="Button" type="submit" form="Alpha">Confirm</button>
</form>

You would want to validate the form fields when you actually submit the form. When you click on the button you are still in the process of triggering the submit.
Try changing this:
$('#Button').click(function() {
Into this:
$('#Alpha').on('submit', function() {
See if that helps.

cancel in confirm function submitting form in javascript

Got a form that requires users to input an amount to donate. On clicking submit, a function is called and the function is meant to display the amount specified and prompt the user to confirm if the amount typed is the actual amount or not.
The Cancel option in the Confirm() keeps submitting the form instead of returning false.
function donationFormSend(){
get_donation_amount = document.getElementById("get_donation_amt").value;
if(get_donation_amount != ''){
return confirm("You have specified "+get_donation_amount+" as the amount you wish to donate. \n\n Are you sure you want to proceed with the donation?");
}
else{
alert("Amount must be specified to process your donation.");
return false;
}
}
<form method="post" action="">
<div>
<div>Donation Amount:</div>
<input name="amount" type="text" id="get_donation_amt" required="required" />
</div>
<input name="donation_submit" type="submit" id="Submit" value="Proceed" onclick="return donationFormSend();" />
</form>
Jsfiddle link
Would be pleased getting help with this.

I updated your jsfiddle so it's in the expected format (loading the js in the head) and returning the confirm result
return confirm('blah blah')
works perfectly well for me in FF! Just make sure you clear your cache and reload your page.

A way to do do it might be:
form :
<form id='test' method="post" action="">
<div>
<div>Donation Amount:</div>
<input name="amount" type="text" id="get_donation_amt" required="required" />
</div>
<input type="submit" value="submit" onClick="form_submit(this.value)">
<input type="submit" value="cancel" onClick="form_submit(this.value)">
</form>
javascript:
document.getElementById('test').addEventListener('submit',function (event) {
if (event.preventDefault) {
event.preventDefault();
} else {
event.returnValue = false;
}
})
form_submit= function (submited_by) {
if(submited_by == 'submit'){
alert('Submited')
}else if (submited_by == 'cancel'){
alert('cancelled')
}
}
I'd rather use a switch statement to make it expandable in the future but this should work.
Also I'm using jquery mostly because I'm not sure how to stop default action without it.
here's a JSFiddle with the code running.
EDIT: Updated to not use Jquery.
EDIT: well, I feel stupid now, realised it wasn't cancel button in a submit form but in a confirmation form.

In your HTML use : onclick="return donationFormSend();"
In Your Javascript: return confirm("Are you sure ....blah blah blah")

JS validation false, form still submitting

I've got a JS problem. My validation seems to be working, checking that the user inputs a valid number which isn't zero, but the form is still submitting. I have seen this question asked many times but I can't find a solution that works for me. Any ideas would be great.
My Javascript
function checkNotZero()
{
var theNumber = document.getElementById("theNumber").value;
var str = /^\+?[1-9]\d*$/.test(theNumber);
if ( str == false ) {
alert('You have not entered a valid number');
return false;
} else {
document.getElementById('numberCheck').submit();
}
}
My HTML
<form action="/next.php" method="post" id="numberCheck">
<input type="text" id="theNumber" value="0">
<button id="submitButton" OnClick="checkNotZero();">Add to Basket</button>
</form>

Use an <input type="submit"> for the submit button.
Validate on the form's submit event rather than some onclick. Forms can get submitted in other ways than just clicking a button (for instance, pressing "enter", or procedurally through code).
Prefer .addEventListener to attributes for attaching events to elements. Use preventDefault() to prevent form submission.

Hi for the above requirement of 'validating form' java script validation should be done
when the form gets submitted. follow the below approach, form will not get submitted
until and unless the validation is correct.
<html>
<head>
<script type="text/javascript">
function checkNotZero()
{
var theNumber = document.getElementById("theNumber").value;
var str = /^\+?[1-9]\d*$/.test(theNumber);
if ( str == false ) {
alert('in');
alert('You have not entered a valid number');
return false;
} else {
document.getElementById('numberCheck').submit();
}
}
</script>
</head>
<body>
<form action="/next.php" method="post" id="numberCheck" onsubmit="return
checkNotZero()">
<input type="text" id="theNumber" value="0">
<button id="submitButton">Add to Basket</button>
</form>
</body>
</html>
the only change is <form action="/next.php" method="post" id="numberCheck"
onsubmit="return checkNotZero()">
do not use onclick event in submit button.

Submitting forms using JavaScript

I have been battling for the past two days with the evil onbeforeunload function in JavaScript. I have a function that warns the user when they are about to close a page.
However before the page close I would like to submit the form using JavaScript's .submit().
This is my code:
function setPopUpWindow(submitForm){
window.onbeforeunload = function () {
if (submitForm == false ) {
//alert("It worked"); --This code gets called so I know it works
document.getElementById("CancelScripting").submit();
//return "Unsaved Data would be lost";
}
}
}
In my html I have two buttons, one is (supposed to) trigger the .submit() and the other will just ignore it.
<body>
<form action=tett.html id="popUpForm" method=POST>
<script>setPopUpWindow();</script>
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
<input class=b1 type=submit id="CancelScripting" style="visibility:hidden" value="CancelScripting" >
</body>
The `setPopWindow value for the second input is not defined so it would be false.
For some reason the submit is not working well.
------------------------Edit to my question-----------------------------------------------
I would like to submit the form even if the user leaves the page by closing the X button on their window. This is the reason why I have the hidden button... Looks like people misunderstood my question.

The only thing you can do is to ask the user if they really want to leave the page:
<head>
<script type="text/javascript">
var submitForm = false;
window.onbeforeunload = function () {
if(submitForm == false){
return 'You have an unfinished form ...';
}
}
function setPopUpWindow(type){
submitForm = true;
}
</script>
</head>
<body>
<form action="" method="post" name="SubmitForm" id="SubmitForm">
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
</form>
</body>

I think that what you want to do is submit the form rather than the button by doing something like:
document.forms["formId"].submit();
where formId is the id of the form.
Also, I dont see anywhere in your code where your form is but your buttons should be inside of form tags.
For example, it should look like this:
<body>
<script>setPopUpWindow();</script>
<form id="formId" action="" method="post">
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
<input class=b1 type=submit id="CancelScripting" style="visibility:hidden" value="CancelScripting" >
</form>
</body>