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Form is Submitting Although Error Handled on Blank Fields

I am trying to submit a form with a little error handling. when the fields are empty there will be a warning and it shouldn't be saved on DB. if the fields are filled there should be a success alert. My case is still the empty value is being saved.
HTML
<input type="submit" id="add" onclick="emptyHandling();" name="_add" class="btn btn-primary btn-size" value="Add"/>
//FORM SUBMIT
$(document).ready(function(){
$("#form").on('submit', function(e){
e.preventDefault();
$.ajax({
type: 'POST',
url: 'add.php',
data: new FormData(this),
dataType: 'json',
contentType: false,
cache: false,
processData:false,
async: false,
autoUpload: false,
success: function(response){
$('.statusMsg').html('');
if(response.status == 1){
$('#form')[0].reset(); //FORM TO RESET AFTER SUBMISSION
$('.statusMsg').html('<p class="alert alert-success">'+response.message+'</p>'); // REPONSE MESSAGE
}else{
$('.statusMsg').html(alert(response.message));
}
$('#form').css("opacity","");
$(".submit").removeAttr("disabled");
}
});
});
});
//ERROR HANDLING - TRIGGERED ON CLICK
function emptyHandling(){
var inv = $("#inv").val();
if(inv == ''){
var message = "Field Left Empty";
alertMessage(message);
}else{
successMessage();
}
return false; // THIS IS BEING RETURNED FALSE
}
//WARNING ALERT
function alertMessage(titleMessage){
swal({
title: titleMessage,
text: "Mandatory Fields are Required to be Filled",
type: "warning",
confirmButtonClass: "btn btn-danger"
});
}
The return is made false on error handling which should stop the next processes. I am not really sure of where the mistake is made.

You can remove onclick from your submit button and move that function call inside your form submit handler . Then , inside this check if the validation function return true/false depending on this execute your ajax call.
Demo Code :
$(document).ready(function() {
$("#form").on('submit', function(e) {
e.preventDefault();
//call function..
if (emptyHandling()) {
//your ajax...
console.log("inside ajax....")
}
});
});
//ERROR HANDLING - TRIGGERED ON CLICK
function emptyHandling() {
var flag = true
var inv = $("#inv").val();
if (inv == '') {
var message = "Field Left Empty";
alertMessage(message);
flag = false
} else {
successMessage();
}
return flag; // return flag//
}
//WARNING ALERT
function alertMessage(titleMessage) {
//swal...
console.log(titleMessage)
}
function successMessage() {
console.log("All good...")
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
<form id="form">
<input type="text" id="inv">
<input type="submit" id="add" name="_add" class="btn btn-primary btn-size" value="Add" />
</form>

JavaScript validation before AJAX submission

I'm trying to validate a form before allowing my ajax submission,however I have two problems. The first problem being I don't know how to best go about validating before submission (most professional process). The second problem being, what is preventing my validation code I currently from working? Looking to become more efficient so all input is welcome. Thanks a ton.
$('#form-reg').on('submit', function(){
var bool = false;
var name = document.getElementById('#name-reg');
var email = document.getElementById('#email-reg');
console.log(name);
console.log(email);
if(!/[^a-zA-Z]/.test(name)){
bool = true;
}
else{
bool = false;
}
if(bool == true){
console.log(document.getElementById('#name-reg'));
$('#form-reg').slideUp('slow');
// serialize the form
var formData = $(this).serialize();
console.log(formData);
$.ajax({
type : 'POST',
url : 'register.php',
data : formData,
success: function() {
alert("Success");
},
error: function(xhr) {
alert("fail");
}
})
.done(function (data) {
document.getElementById('form-reg').reset();
})
.fail(function (error) {
alert("POST failed");
});
//return false;
}
else {
alert('try again');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js" type="text/javascript">
<form id = "form-reg">
<label id ="x" for="name">Name</label>
<input id="name-reg" name="name"></br>
<label id = "y" for="email">Email</label>
<input id="email-reg" name="email"></br>
<input type="submit" value="submit" id = "submit-reg">
</form>

The issue with your code is you have to stop the form submit like:
$('#form-reg').on('submit', function(e){
e.preventDefault();
and after checking the validation, submit the form if validation succeeds.

Although it is a minor answer, I will post it anyway. The problem looks like the use of
var name = document.getElementById('#name-reg');
the # is causing the first problem and should be
var name = $('#name-reg').val();
$('#form-reg').on('submit', function(){
var bool = false;
var name = $('#name-reg').val();
var email = $('#email-reg').val();
console.log(name);
console.log(email);
if(!/[^a-zA-Z]/.test(name)){
bool = true;
}
else{
bool = false;
}
if(bool == true){
console.log($('#name-reg').val());
$('#form-reg').slideUp('slow');
// serialize the form
var formData = $(this).serialize();
console.log(formData);
$.ajax({
type : 'POST',
url : 'register.php',
data : formData,
success: function() {
alert("Success");
},
error: function(xhr) {
alert("fail");
}
})
.done(function (data) {
document.getElementById('form-reg').reset();
})
.fail(function (error) {
alert("POST failed");
});
//return false;
}
else {
alert('try again');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js" type="text/javascript">
<form id = "form-reg">
<label id ="x" for="name">Name</label>
<input id="name-reg" name="name"></br>
<label id = "y" for="email">Email</label>
<input id="email-reg" name="email"></br>
<input type="submit" value="submit" id = "submit-reg">
</form>

Submit Form With JQuery And Ajax

I am working on discussion that works like a forum. There can be several posts and users are supposed to comment.
I have this html post comment form which repeats itself after every post
<form method="POST" action="/discussion/post-comment" id="post-comment-form" class="form-horizontal subcommentcofrm" role="form">
<div class = "form-group">
<div class = "col-sm-6">
<input type = "text" class = "form-control comment-yako" id = "comment-field" placeholder = "Type your comment here..." autocomplete="off">
</div>
</div>
</form>
And this is my JQuery code with ajax submission:
$("input.comment-yako").live('keypress', function(e) {
if ((e.which && e.which === 13) || (e.keyCode && e.keyCode === 13)) {
console.log('heey');
$(this).closest('form').submit(function(e){
console.log('heeeeeeey');
var data = $(this).serializeArray();
var url = $(this).attr("action");
$.ajax({
url: url,
type: 'POST',
cache: false,
data: data,
success: function(data) {
var item = $(data).hide().fadeIn(800);
$('.disc-content-reply').append(item);
},
error: function(e) {
alert(e);
}
});
e.preventDefault();
});
$(this).closest(".comment-yako").val("");
return false;
} else {
return true;
}
});
Submission is supposed to take place when the user hits enter key.
My problem is, when I hit enter, the form does not submit. I do not know where the problem is; what am I doing wrong?
Any help will be much appreciated.
Thanks

You should send the AJAX request in the keypress handler itself, not in a submit handler that you bind after the keypress occurs. Most of the time it's wrong to bind one event handler inside another event handler; if you find yourself doing that, think very hard about whether it's really what you want to do.
In addition to changing that, I've converted the .live() call to .on(). I also changed from .serializeArray() to .serialize(), as this is the normal way to send form fields.
$(document).on('keypress', 'input.comment-yako', function(e) {
if ((e.which && e.which === 13) || (e.keyCode && e.keyCode === 13)) {
console.log('heey');
var form = $(this).closest('form');
var data = form.serialize();
var url = form.attr("action");
$.ajax({
url: url,
type: 'POST',
cache: false,
data: data,
success: function(data) {
var item = $(data).hide().fadeIn(800);
$('.disc-content-reply').append(item);
},
error: function(e) {
alert(e);
}
});
e.preventDefault();
$(this).val("");
return false;
} else {
return true;
}
});

Only send post/get if form values has changed

I want to prevent multiple ajax calls (user holds enter key down or multi presses submit or other)
I'm thinking, the best way is to use a var with the previous form post values and compare them at each click/submit.. Is it the same? : Then do nothing
But I don't know how to go about it
Here is my javascript/jquery:
$('form').submit(function() {
$theform = $(this);
$.ajax({
url: 'validate.php',
type: 'POST',
cache: false,
timeout: 5000,
data: $theform.serialize(),
success: function(data) {
if (data=='' || !data || data=='-' || data=='ok') {
// something went wrong (ajax/response) or everything is ok, submit and continue to php validation
$('input[type=submit]',$theform).attr('disabled', 'disabled');
$theform.unbind('submit').submit();
} else {
// ajax/response is ok, but user input did not validate, so don't submit
console.log('test');
$('#jserrors').html('<p class="error">' + data + '</p>');
}
},
error: function(e) {
// something went wrong (ajax), submit and continue to php validation
$('input[type=submit]',$theform).attr('disabled', 'disabled');
$theform.unbind('submit').submit();
}
});
return false;
});

Not very creative with naming vars here:
var serial_token = '';
$('form').submit(function() {
$theform = $(this);
if ($(this).serialize() === serial_token) {
console.log('multiple ajax call detected');
return false;
}
else {
serial_token = $(this).serialize();
}
$.ajax({
url: 'validate.php',
type: 'POST',
cache: false,
timeout: 5000,
data: $theform.serialize(),
success: function(data) {
if (data=='' || !data || data=='-' || data=='ok') {
// something went wrong (ajax/response) or everything is ok, submit and continue to php validation
$('input[type=submit]',$theform).attr('disabled', 'disabled');
$theform.unbind('submit').submit();
} else {
// ajax/response is ok, but user input did not validate, so don't submit
console.log('test');
$('#jserrors').html('<p class="error">' + data + '</p>');
}
},
error: function(e) {
// something went wrong (ajax), submit and continue to php validation
$('input[type=submit]',$theform).attr('disabled', 'disabled');
$theform.unbind('submit').submit();
}
});
return false;
});
You could combine this with a timeout/interval function which aborts the submit, but the code above should just compare the data in the form

If you have some kind of submit button, just add a class 'disabled' to it when you start the ajax call, and check if it is present before trying to make the call. Remove the class when the server gives a response. Something like:
...
$theform = $(this);
$button = $theform.find('input[type=submit]');
if ($button.hasClass('disabled')) {
return false;
}
$button.addClass('disabled');
$.ajax({
....
},
complete: function () {
$button.removeClass('disabled');
}
});
...

Enter key to submit Ajax form

I have a very simple AJAX form that asks for an email address and sends it to me after submitting.
How can I can I get the form to submit when hitting the enter key?
This runs when user clicks submit button:
<script type="text/javascript">
$(document).ready(function () {
$("#submit_btn").click(function () {
// Get input field values:
var user_email = $('input[name=email]').val();
// Simple validation at client's end
// We simply change border color to red if empty field using .css()
var proceed = true;
if (user_email === "") {
$('input[name=email]').css('border-color', 'red');
proceed = false;
}
// Everything looks good! Proceed...
if (proceed) {
/* Submit form via AJAX using jQuery. */
}
});
// Reset previously set border colors and hide all message on .keyup()
$("#contact_form input, #contact_form textarea").keyup(function () {
$("#contact_form input, #contact_form textarea").css('border-color', '');
$("#result").slideUp();
});
});
</script>
I know this question has been asked before -- I'm having trouble getting the keypress function to work.
I tried this to no avail:
$("#contact_form").keypress(function (e) {
if ((e.keyCode == 13) && (e.target.type != "textarea")) {
e.preventDefault();
// Get input field values
var user_email = $('input[name=email]').val();
// Simple validation at client's end
// We simply change border color to red if empty field using .css()
var proceed = true;
if (user_email === "") {
$('input[name=email]').css('border-color', 'red');
proceed = false;
}
// Everything looks good! Proceed...
if (proceed) {
/* Submit form via AJAX using jQuery. */
}
}
});
The form is #contact_form.
Any help would be would appreciated…

Just bind the submit event to your form, and then the enter key will also work:
$("#contact_form").submit(function (e) {
e.preventDefault();
// Get input field values
var user_email = $('input[name=email]').val();
// Simple validation at client's end
// We simply change border color to red if empty field using .css()
var proceed = true;
if (user_email === "") {
$('input[name=email]').css('border-color', 'red');
proceed = false;
}
if (proceed) {
// Insert the AJAX here.
}
});
And the code is here: http://jsfiddle.net/6TSWk/6/

add new class in every fieldbox or checkbox => class keypressbutton
then replace your code on keypress with this, below :
$(document).on("keypress",".keypressbutton",function(event) {
var keyCode = event.which || event.keyCode;
if (keyCode == 13) {
$("#submit_btn").click();
return false;
}
});

$("#myform").keypress(function(event){
if(event.keycode===13){ // enter key has code 13
//some ajax code code here
//alert("Enter key pressed");
}
});

You have two opening brackets in your if statement and miss a closing bracket. Also, I would change e.target.type. Try this:
$("#contact_form").keypress(function (e) {
if ((e.keyCode == 13) && ($('input[name="email"]').is(':focus'))) {
e.preventDefault();
//get input field values
var user_email = $('input[name=email]').val();
//simple validation at client's end
//we simply change border color to red if empty field using .css()
var proceed = true;
if (user_email === "") {
$('input[name=email]').css('border-color', 'red');
proceed = false;
}
}
});

Instead of using button on click function you can use submit button.
Load the validate.js file
function validateEmail(email)
{
var reg = /^\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*$/
if (reg.test(email))
{
return true; }
else{
return false;
}
}
$("#test-form").validate({
submitHandler: function(form) {
//form.submit();
var email=$("#email").val();
if(email=='' )
{
// Here you can type your own error message
$('#valid').css("display","none");
$('#empty').css("display","block");
return false;
}
if (!(validateEmail(email))) {
$('#empty').css("display","none");
$('#valid').css("display","block");
return false;
}
else {
$.ajax({
url: "signup.php",
type: form.method,
data: $(form).serialize(),
success: function(response) {
}
});
}
}
});
});

Simple way is this:
In HTML codes:
<form action="POST" onsubmit="ajax_submit();return false;">
<b>First Name:</b> <input type="text" name="firstname" id="firstname">
<br>
<b>Last Name:</b> <input type="text" name="lastname" id="lastname">
<br>
<input type="submit" name="send" onclick="ajax_submit();">
</form>
In Js codes:
function ajax_submit()
{
$.ajax({
url: "submit.php",
type: "POST",
data: {
firstname: $("#firstname").val(),
lastname: $("#lastname").val()
},
dataType: "JSON",
success: function (jsonStr) {
// another codes when result is success
}
});
}