HTML5 validation - forms

Question

I wonder if HTML5 have any formvalidation for dual entry (write 2 identical password) and can you write own exceptions?
Thanx in advance!

Answer 1

If you want something a bit nicer and HTML5-utilising, try this:
http://www.html5rocks.com/en/tutorials/forms/html5forms/
<label>Password:</label>
<input type="password" id="password" name="password">
<label>Confirm Password:</label>
<input type="password" id="passwordconf" name="passwordconf" oninput="check(this)">
<script language='javascript' type='text/javascript'>
function check(input) {
if (input.value != document.getElementById('password').value) {
input.setCustomValidity('The two passwords must match.');
} else {
// input is valid -- reset the error message
input.setCustomValidity('');
}
}
</script>
Make it fancy by adding this to your CSS (below). It puts a red border around the offending input fields when they fail HTML5 validation.
:invalid {
border: 2px solid #ff0000;
}
All done. You should still use an alert() or server-side validation to ensure that the user inputs both passwords correctly. Don't rely on client-side anything.

Answer 2

I had a similar problem, and to solve it using the HTML5 api I did this: setted a pattern for the password to contain at least eight letters and a number. Then to make them matching I did:
var password = document.querySelector('#password'),
passwordConfirm = document.querySelector('#password_confirm');
[].forEach.call([password, passwordConfirm], function(el) {
el.addEventListener('input', function() {
if (!el.validity.patternMismatch) {
if ( password.value === passwordConfirm.value ) {
try{password.setCustomValidity('')}catch(e){}
} else {
password.setCustomValidity("Password and password confirm doesn\'t match")
}
}
}, false)
});
where with el.validity.patternMismatch check for the pattern validity first and then check for the validity of the two.
Here is my password input with the pattern.
<input type="password" pattern="^((?=.*(\d|\W))(?=.*[a-zA-Z]).{8,})$" id="password" />

Answer 3

I'm quite sure that's not possible. Also, it can be easily covered by javascript so why not use that instead?
This works perfectly well:
<script language="javascript">
function checkPassword() {
if (document.pwForm.pw1.value != document.pwForm.pw2.value) {
alert ('The passwords do not match!');
return false;
}
}
</script>
<form action="filename.ext" name="pwForm" method="GET/POST">
<input type="password" name="pw1" value=""><br />
<input type="password" name="pw2" value=""><br />
<input type="Submit" name="CheckPassword" value="Check Passwords" onClick="return checkPassword();">
</form>

Answer 4

Thanks Kicker, that was really useful.
I extended it a little to make the password and password confirm inputs to be invalid as soon as typing in the input started.
var password = document.querySelector(' input[name=usr_password]');
var passwordConfirm = document.querySelector(' input[name=usr_password_confirm]');
if (password && passwordConfirm)
{
[].forEach.call([password, passwordConfirm], function(el) {
el.addEventListener('input', function() {
if ( el.validity.patternMismatch === false) {
if ( password.value === passwordConfirm.value ) {
try{
password.setCustomValidity('');
passwordConfirm.setCustomValidity('');
}
catch(e){}
}
else {
password.setCustomValidity("The two passwords do not match");
}
}
if ((password.checkValidity() && passwordConfirm.checkValidity()) === false)
{
password.setCustomValidity("The two passwords do not match, and they don't comply with the password rules.");
passwordConfirm.setCustomValidity("The two passwords do not match, and they don't comply with the password rules.");
}
else
{
password.setCustomValidity('');
passwordConfirm.setCustomValidity('');
}
}, false)
});
}

Answer 5

I think this is what you are looking for.
<p>Password: <input type="password" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}" name="pwd1" onchange="
this.setCustomValidity(this.validity.patternMismatch ? 'Password must contain at least 6 characters, including UPPER/lowercase and numbers' : '');
if(this.checkValidity()) form.pwd2.pattern = this.value;
"></p>
<p>Confirm Password: <input type="password" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}" name="pwd2" onchange="
this.setCustomValidity(this.validity.patternMismatch ? 'Please enter the same Password as above' : '');
"></p>
This will do the password and retype password fields validation.

Answer 6

Another option is to use http://jqueryvalidation.org/validate/, if you don't mind using Jquery to do your dirty work.
Check out http://jqueryvalidation.org/equalTo-method
<form id="myform">
<label for="password">Password</label>
<input id="password" name="password" />
<br/>
<label for="password_again">Again</label>
<input class="left" id="password_again" name="password_again" />
<br>
<input type="submit" value="Validate!">
</form>
<script>
$( "#myform" ).validate({
rules: {
password: "required",
password_again: {
equalTo: "#password"
}
}
});
</script>
You can also write more complicated methods if required: http://jqueryvalidation.org/category/plugin/