Can you require two form fields to match with HTML5? - forms

Question

Is there a way to require the entries in two form fields to match using HTML? Or does this still have to be done with JavaScript? For example, if you have two password fields and want to make sure that a user has entered the same data in each field, are there some attributes, or other coding that can be done, to achieve this?

Answer 1

Not exactly with HTML validation but a little JavaScript can resolve the issue, follow the example below:
function check() {
var input = document.getElementById('password_confirm');
if (input.value != document.getElementById('password').value) {
input.setCustomValidity('Password Must be Matching.');
} else {
// input is valid -- reset the error message
input.setCustomValidity('');
}
}
<p>
<label for="password">Password:</label>
<input name="password" required="required" type="password" id="password" oninput="check()"/>
</p>
<p>
<label for="password_confirm">Confirm Password:</label>
<input name="password_confirm" required="required" type="password" id="password_confirm" oninput="check()"/>
</p>
<input type="submit" />

Answer 2

You can with regular expressions Input Patterns (check browser compatibility)
<input id="password" name="password" type="password" pattern="^\S{6,}$" onchange="this.setCustomValidity(this.validity.patternMismatch ? 'Must have at least 6 characters' : ''); if(this.checkValidity()) form.password_two.pattern = this.value;" placeholder="Password" required>
<input id="password_two" name="password_two" type="password" pattern="^\S{6,}$" onchange="this.setCustomValidity(this.validity.patternMismatch ? 'Please enter the same Password as above' : '');" placeholder="Verify Password" required>

Answer 3

A simple solution with minimal javascript is to use the html attribute pattern (supported by most modern browsers). This works by setting the pattern of the second field to the value of the first field.
Unfortunately, you also need to escape the regex, for which no standard function exists.
<form>
<input type="text" oninput="form.confirm.pattern = escapeRegExp(this.value)">
<input name="confirm" pattern="" title="Fields must match" required>
</form>
<script>
function escapeRegExp(str) {
return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
}
</script>

Answer 4

JavaScript will be required, but the amount of code can be kept to a minimum by using an intermediary <output> element and an oninput form handler to perform the comparison (patterns and validation could augment this solution, but aren't shown here for sake of simplicity):
<form oninput="result.value=!!p2.value&&(p1.value==p2.value)?'Match!':'Nope!'">
<input type="password" name="p1" value="" required />
<input type="password" name="p2" value="" required />
<output name="result"></output>
</form>

Answer 5

Not only HTML but a bit of JavaScript
HTML
<form class="pure-form">
<fieldset>
<legend>Confirm password with HTML5</legend>
<input type="password" placeholder="Password" id="password" required>
<input type="password" placeholder="Confirm Password" id="confirm_password" required>
<button type="submit" class="pure-button pure-button-primary">Confirm</button>
</fieldset>
</form>
JavaScript
var password = document.getElementById("password")
, confirm_password = document.getElementById("confirm_password");
function validatePassword(){
confirm_password.setCustomValidity( password.value !=
confirm_password.value ? "Passwords Don't Match" : '');
}
password.onchange = validatePassword;
confirm_password.onkeyup = validatePassword;
CodePen Demo

Answer 6

As has been mentioned in other answers, there is no pure HTML way to do this.
If you are already using JQuery, then this should do what you need:
$(document).ready(function() {
$('#ourForm').submit(function(e){
var form = this;
e.preventDefault();
// Check Passwords are the same
if( $('#pass1').val()==$('#pass2').val() ) {
// Submit Form
alert('Passwords Match, submitting form');
form.submit();
} else {
// Complain bitterly
alert('Password Mismatch');
return false;
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form id="ourForm">
<input type="password" name="password" id="pass1" placeholder="Password" required>
<input type="password" name="password" id="pass2" placeholder="Repeat Password" required>
<input type="submit" value="Go">
</form>

Answer 7

<div className="form-group">
<label htmlFor="password">Password</label>
<input
value={password}
onChange={(e) => { setPassword(e.target.value) }}
type="password" id='password' name="password" required minLength={3} maxLength={255} />
</div>
<div className="form-group">
<label htmlFor="confirmPassword">Confirm Password</label>
<input
title='Passwords should be match'
pattern={`${password}`}
value={confirmPassword}
onChange={(e) => { setConfirmPassword(e.target.value) }}
type="password" id='confirmPassword' name="confirmPassword" required minLength={3} maxLength={255} />
</div>