Develop Reference

Cancelling a form submission, then submitting it again

So I have a login form. What I want I am currently doing is submitting the form using action="" etc.. with an onSubmit even with my form validation inside the javascript function validate(). Currently though it will submit the form and validate at the same time. What I want to happen is for it to not submit the form, or to cancel it as soon as we get into the validate function. And then if the forms are valid, submit the form.
This is my logic behind what I want to do
function validate() {
stopFormSubmit();
var username = $("#username").val();
var password = $("#password").val();
if(username != "" && password != "") {
submitForm();
} else {
displayErrors();
}
}
My form looks like this
<form onSubmit="validate()" name="basicForm" id="basicForm" class="basicForm" action="login.php" method="post" autocomplete="off">
Is there anyway to do this?

The form does validate and then submit. Validation just takes very little time.
What you really want to do is to stop the form if it fails validation.
Using intrinsic event attributes, return false to stop the form being submitted. Since that is determined by the success of the validation, you need to return true or false from validate and then return that from your event handler.
onSubmit="return validate()"
and
function validate() {
var username = $("#username").val();
var password = $("#password").val();
if(username != "" && password != "") {
return true;
} else {
displayErrors();
return false;
}
}
Modern code would use unobtrusive JavaScript and bind the event handlers programatically. Then it would use the Event object to control that happened to the default behaviour. Since you are already using jQuery, we can use that to perform the event binding.
Remove the onsubmit attribute entirely.
jQuery('form').on('submit', validate); // Run this after the form exists in the DOM
and
function validate(evt) {
var username = $("#username").val();
var password = $("#password").val();
if(username != "" && password != "") {
// Do nothing
} else {
displayErrors();
evt.preventDefault();
}
}

I suggest to use jQuery Validation plugin, if possible.
Another idea - to do like here:
1. onSubmit="return validate()"
2. Update function:
function validate() {
var username = $("#username").val();
var password = $("#password").val();
if(username != "" && password != "") {
submitForm();
// or you can simply return true to allow form data submitting
} else {
displayErrors();
return false;
}
}

validating custom domain for signup form using javascript?

I am trying to validate my company email-id's in sign up form...so that the form accepts only my company mail id...so now whats the problem here is after validating(ie; when we click submit button then we get an alert message) the form is getting refreshed and the entered values are cleared...so any help or suggestions so that it is not refreshed??thanks in advance...
My Javascript method is:
function submitAlbum() {
var frm = document.getElementById("frmRegistration");
//validateEmail(document.getElementById('email').value);
var email = document.getElementById('email').value;
var re = /^\s*[\w\-\+_]+(\.[\w\-\+_]+)*\#[\w\-\+_]+\.[\w\-\+_]+(\.[\w\-\+_]+)*\s*$/;
if (re.test(email)) {
if (email.indexOf('#bdisys.com', email.length - '#bdisys.com'.length) !== -1) {
// alert('Submission was successful.');
var r = confirm("Are You Sure You Want to add your details.");
if (r == true) {
frm.action = "signUpServlet?formidentity=doRegistration&checkboxStatus=" + checkboxStatus;
frm.submit();
}
}
else {
document.getElementById('email').focus();
alert('Email must be a Company e-mail address (your.name#bdisys.com).');
return false;
}
}
else {
document.getElementById('email').focus();
alert('Not a valid e-mail address.');
return false;
}
}

I think this will do the job.
<input type = "email" pattern ="^[a-z0-9._%+-]+#bdisys.com">
Check this bin
http://jsbin.com/dew/5/edit

You should bind your validation method to the submit event of your form.
Inside the validation method, stop the event to propagate if the field is invalid, or let it bubble if it's ok.
var frm = document.getElementById("frmRegistration");
frm.addEventListener('submit', validate, false);
var re = /^\s*[\w\-\+_]+(\.[\w\-\+_]+)*\#[\w\-\+_]+\.[\w\-\+_]+(\.[\w\-\+_]+)*\s*$/;
function validate(event) {
// validateEmail
var email = document.getElementById('email').value;
var confirmed = false;
if (re.test(email)) {
confirmed = true;
if (email.indexOf('#bdisys.com', email.length - '#bdisys.com'.length) !== -1) {
confirmed = confirm("Are You Sure You Want to add your details.");
}
} else {
document.getElementById('email').focus();
alert('Email must be a Company e-mail address (your.name#bdisys.com).');
}
if (!confirmed) {
event.preventDefault();
event.stopPropagation();
return false;
}
}
I suggest you to use jQuery to make your code simplier and before all portable.

AJAX stored requests and form submitting

I am working on a jQuery validation "plugin" (not yet a plugin) that use my Zend_Form validators to verify the fields before submitting, client-side, so I only have to specify my constraints one time instead of two (Zend Validators + jQuery Validate Plugin, for example).
I store the validation AJAX requests for each field, then wait for them to finish, and then read the results and show or not an error message.
The problem : when I enter validated strings and hit submit, it shows no errors (good so far), but I have to re-click the submit button the form to really submit it.
Making a return true or false inside the .whenAll function is ignored and does not work, that's why I used a flag to tell the function if yes or no it can really submit the form.
$(function() {
var form = $('form'); // target form
var requests = [], validations = []; // used to store async requests and their results
var nbInputs = $('input[type="text"], input[type="password"]').length; // number of inputs we want to check in the form
var cancelSubmit = true; // skip validation flag
form.submit(function( ) {
// if we call the submit inside the function, skip validation and do submit the form
if(cancelSubmit === false) {
console.log('[-] cancelSubmit is false. Validation skipped.');
this.submit();
return true;
}
console.log('[-] Entering validation');
// resetting requests and validations
requests.length = 0;
validations.length = 0;
// for each input (text/password), storing the validation request
$('input[type="text"], input[type="password"]').each(function(i) {
var validatorField = $(this).attr('data-validator');
var valueField = $(this).val();
postData = {
validator: validatorField,
value: valueField
};
// storing requests into an array
requests.push($.post('/validate', postData));
});
(function($) {
$.whenAll = function() {
return $.when.apply($, arguments);
};
})(jQuery);
// when all the requests are done and returned a response
$.whenAll(requests).then(function() {
// show the validation status for each input
$.each(requests, function(i, element) {
element.done(function(data) {
// response is formatted like this
// { valid: 1 } or { valid: 0, message:"This is the error message" }
json = $.parseJSON(data);
formGroup = $('input:eq('+i+')').parent();
// if it isn't valid, show error and store result
if(json.valid == 0) {
if($('span.help-block', formGroup).length == 0) {
$(formGroup).addClass('has-error').append('<span class="help-block">'+json.message+'</span>');
$('label', formGroup).addClass('control-label');
}
validations.push(0);
}
// else, remove error (if there was) and store the result
else if(json.valid == 1) {
if($(formGroup).hasClass('has-error'))
{
$(formGroup).removeClass('has-error');
$('.help-block', formGroup).remove();
}
validations.push(1);
}
// if we got all the validations required
if(validations.length == nbInputs)
{
console.log('[-] All validations have been done.');
// and if no error ("0") in the results, we resubmit the form with skip-flag
if($.inArray(0, validations) == -1){
console.log('[-] No errors. Submitting form.');
cancelSubmit = false;
form.off('submit');
form.submit();
}
else
console.log('[-] There is still errors.');
}
});
});
});
// there are errors, so we won't submit the form
if(cancelSubmit === true)
return false;
});
});
Do you see a logic flaw in my code ? Maybe re-submitting the form with a flag isn't the right way to do it ?

You're returning from a sub scope rather than from the form submit handler. Instead, always prevent the submit, and then force it to submit with form[0].submit() when you want it to submit.
form.submit(function(e) {
e.preventDefault();
...
// now i want to submit...
form[0].submit();
form[0].submit() will bypass your jquery bound submit handler.

Validate form using jQuery

When a form submit button is clicked, a function to validate all the field is to be called. Nothing is to happen, however, if the validation fails.
I am using mailto: as my action, does this make a difference?
I would like to get clarification on two things:
Is this the correct way to call a function when clicking the submit button?
$(document).ready(function(){
$('#contactForm').submit(function(){
checkMail();
});
});
Can I still validate the fields even though I'm using mailto:?
Here is the rest of the code:
function checkEmail(){
var email = document.contact.email.value;
if(email == "") {
document.getElemtById("email_error").innerHTML = "No Email Address";
return false;
}
else {
document.getElementById("email_error").innerHTML = ""
return true;
}
}
HTML:
<form name="contact" action="mailto:exampleemail#hotmail.com" method="post">
<li>
<label for="email">Email</label>
<input id="email" type="text" name="email" placeholder="Enter Email Address">
</li>
<span id="email_error"></span>
Further, I don't get an error message on clicking submit.

No, you need the event handler to return false in case the validation failed. This will prevent the action from being executed, i.e. the mail program from being launched.
we can cancel the submit action by calling .preventDefault() on the event object or by returning false from our handler.
Source
Modify it like this:
$(document).ready(function(){
$('#contactForm').submit(function(){
return validate();
});
});
Of course, this implies that the validate() function needs to actually return false in case the validation fails, and true otherwise.
Further you are missing id="contactForm" on your <form> tag.
Also, you need to grab the email value correctly:
var email = $("#email").val();
There's another mistake: You misspelled getElementById(). Here's a corrected version:
function checkEmail() {
var email = $("#email").val();
if (email == "") {
document.getElementById("email_error").innerHTML = "No Email Address";
return false;
}
else {
document.getElementById("email_error").innerHTML = ""
return true;
}
}
Or alternatively, using all jQuery:
function checkEmail() {
var email = $("#email").val();
var $error = $("#email_error");
if (email == "") {
$error.html("No Email Address");
return false;
}
else {
$error.html("");
return true;
}
}

Here's what you need:
$(document).ready(function(){
$('#contactForm').submit(function(){
if (!validate()) {
return false; // Prevent the submit
}
});
});

For validating the fields of your form, before sending it, you can use the jQuery's validation plugin:
$(document).ready(function(){
$("#contactForm").validate({
submitHandler: function(form) {
// some other code
// maybe disabling submit button
// then:
$(form).submit();
}
});
});
Check the online doc for more information and examples: http://docs.jquery.com/Plugins/Validation#Validate_forms_like_you.27ve_never_been_validating_before.21

Form shows mistakenly the success alert box when it has invalid input in jQuery

In the script below I check if the email entered is valid. It is not the best regex but it is ok for now. Also for the moment I do not make any server side check for input. Only with this script.
I have this problem though:
When an email is valid, and after I type an invalid email I get first the Your email is not in valid format and then You will be notified when we launch. Thank you! alert. Also the email is sent. How to fix this ?
Thank you
this is my form
<form id="myform" action="" method="POST">
<input id="subscribe" name="subscribe" class="subscribe floatLeft" type="text">
<button id="signUp" class="signUp floatRight" ><intro>notify!</intro></button>
<div class="clear"> </div>
</form>
and here is the script
var signUp = function(inputEmail) {
var isValid = true;
var emailReg = /^([\w-\.]+#([\w-]+\.)+[\w-]{2,4})?$/;
if (!emailReg.test(inputEmail)) {
isValid = false;
alert('Your email is not in valid format');
}
$("#myform").submit(function(event) {
event.preventDefault();
if (!isValid) {
return false;
} else {
$.post('mailme.php', $("#myform").serialize(), function(data) {
alert('You will be notified when we launch. Thank you!');
});
return false;
}
});
};

You need the onsubmit event to return false;
You need to bind the submit event anyway and make the isValid check there;
$("#myform").submit(function(event){
event.preventDefault();
if(!isValid){
return false;
}else{
$.post(...)
return false;
}
});
--Edit--
Forgot to return false/event.preventDefault; But like i said, the submit event need to be bound anyway
--Edit2--
function validEmail(email){
var emailReg = /^([\w-\.]+#([\w-]+\.)+[\w-]{2,4})?$/;
return email.test(emailReg)
}
$(document).ready(function(){
$("#myform").bind({
submit: function(e){
e.preventDefault();
if(validEmail($("#myform").find("#subscribe").val()){
$.post(...)
alert("You will be notified");
return false;
}
else {
alert("Invalid email");
return false;
}
});
});
}

You need to return false or event.preventDefault() in the emailReg test.