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JavaScript JavaScript validates an invalid email

H

hebrerillo

Active Coder
Hello there!

I have a form that I am validating using the Form Validtion API in JS. I would expect the email address 'hannibal@gmail' to be invalid.

However, the API returnts that it is valid. Here is an example:

HTML: 
<!DOCTYPE html>
<html lang="en">
    <head>
    </head>
    <body>
        <form >
            <input type="email" name="email" value="hannibal@gmail" />
        </form>
        <script>
            const email = document.querySelector("input");
            console.log(email.validity.typeMismatch);
        </script>
    </body>
</html>

The console yields a false, meaning that it is not invalid. But I would expect a type mistmatch error.

Am I missing something??

I have seen other implementations where they use a regex, but I would prefer the JavaScript validation API.

Thank you so much!
 
Solution
JonnyD
Johna said:
Hey there.

Technically, that's not an invalid email address, as you could have, for example, user@localhost, and it is a valid email address.

If you want to make sure the domain has a period in it, then you're going to have to use a regex.
Click to expand...


Johna is absolutelly right and these even have some uses in devops

javascript is kind of special, it's a big too generalistic really.

You should try using a regex, in your javascript


I've been using this:
Code: 
/^((?!\.)[\w\-_.]*[^.])(@\w+)(\.\w+(\.\w+)?[^.\W])$/
on several projects

I know it looks scary if you are new to regex, but it's a life changing tool

you can even use it directly on the html field HTML attribute: pattern - HTML: HyperText Markup Language | MDN...
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Hey there.

Technically, that's not an invalid email address, as you could have, for example, user@localhost, and it is a valid email address.

If you want to make sure the domain has a period in it, then you're going to have to use a regex.
 
Upvote 1 Downvote
It could be down to the browser, i know some browser are not as strict in there checks so what i would do is a HTML check and a Java check afterwards, something like this.


Code: 
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
    <form id="myForm">
        <input type="email" name="email" value="hannibal@gmail" />
        <button type="submit">Submit</button>
    </form>
    <script>
        const form = document.getElementById('myForm');
        const email = form.querySelector("input[name='email']");

        form.addEventListener('submit', (event) => {
            if (!email.checkValidity()) {
                console.log('Email is invalid:', email.validationMessage);
                event.preventDefault();
            } else {
                console.log('Email is valid');
            }
        });
 
        console.log('Initial validity check:', email.checkValidity());
    </script>
</body>
</html>
 
Upvote 1 Downvote
Johna said:
Hey there.

Technically, that's not an invalid email address, as you could have, for example, user@localhost, and it is a valid email address.

If you want to make sure the domain has a period in it, then you're going to have to use a regex.
Click to expand...


Johna is absolutelly right and these even have some uses in devops

javascript is kind of special, it's a big too generalistic really.

You should try using a regex, in your javascript


I've been using this:
Code: 
/^((?!\.)[\w\-_.]*[^.])(@\w+)(\.\w+(\.\w+)?[^.\W])$/
on several projects

I know it looks scary if you are new to regex, but it's a life changing tool

you can even use it directly on the html field HTML attribute: pattern - HTML: HyperText Markup Language | MDN

Best regards
 
Upvote 2 Downvote
Solution
Hello everyone!

Yes, I implemented a regex in the HTML input element. Something like this:

HTML: 
<input type="email" pattern="[^@\s]+@[^@\s]+\.[^@\s]+" title="Invalid email address" />

This way, the function "checkValidity" on the input will fail in JavaScript if the email is invalid.

thank you all for your help!
 
Upvote 0 Downvote

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