But, if your form is rendered on, for example, IE 8.0 or older, no validation will be performed. On another note, the validation will only work if the browser supports HTML5, which is the vast majority of modern browsers. To run a basic email validation, we can use the following code: Īnd now let’s try to insert something that doesn’t even resemble an email address: If no input type is specified, the browser will assume the type is ‘text’, and whatever is inserted will be accepted. Some of the accepted values for type are url, name, number, password, and email.Įach comes with a built-in regular expression (Regex) that checks the input on the client side against the predefined criteria. You’ll probably also specify the type attribute to let the browser know what sort of information you’re looking for. Whenever you want to get input from a visitor (usually via a form), you’ll probably use the typical HTML element of input. The methods are not bulletproof, but are a major step forward. The new specification brought the new built-in methods for input validation, including email address validation. This changed with the creation and wide adoption of HTML5 that quickly followed. The bottom line is that HTML offered no functionalities whatsoever for form validation. Some worked really well some caused more harm than good. Basics of input validation in HTML5īefore HTML5 was released, web developers had to make use of JavaScript functions or 3rd-party libraries to filter out unwanted emails. Luckily, it’s easy to set up a decent email validation in HTML5. If your list is flooded with such addresses, you are likely to experience poor deliverability or your users getting locked out of their accounts more often than you would wish.

Yet another email bounces because a user mistyped it or assumed (rightly so) that your site would accept as a valid email address.

Regex for number input fields html