JavaScript - How to Validate Form Using Regular Expression?

Validate a password using HTML and JavaScript

Last Updated : 30 Sep, 2024

Validating a password using HTML and JavaScript involves ensuring that user-entered passwords meet certain criteria, such as length, complexity, or character types (e.g., uppercase, lowercase, numbers, and symbols). This process enhances security by enforcing strong password requirements before form submission.

A password is correct if it contains:

At least 1 uppercase character.
At least 1 lowercase character.
At least 1 digit.
At least 1 special character.
Minimum 8 characters.

Approach :

Retrieve Input Value: The test_str() function retrieves the value from the input field with id="t1" using document.getElementById().
Check Password Criteria: Regular expressions are used to check for lowercase, uppercase, digits, special characters, and minimum length of 8 characters.
Set Validation Result: If all conditions are met, the result is set to "TRUE"; otherwise, it is set to "FALSE".
Display Output: The result is displayed in a readonly input field with id="t2", showing whether the password is valid or not.

Example: In this example we are following above-explained approach.

HTML

<!DOCTYPE html>
<html>

<head>
    <title>validate password</title>
    <script type="text/javascript">
        function test_str() {
            let res;
            let str =
                document.getElementById("t1").value;
            if (str.match(/[a-z]/g) && str.match(
                /[A-Z]/g) && str.match(
                    /[0-9]/g) && str.match(
                        /[^a-zA-Z\d]/g) && str.length >= 8)
                res = "TRUE";
            else
                res = "FALSE";
            document.getElementById("t2").value = res;

        }
    </script>
</head>

<body>
    <p>
        String:
        <input type="text" placeholder="abc" id="t1" />
        <br />
        <br />
        <input type="button" value="Check" onclick="test_str()" />
        <br />
        <br /> Output:
        <input type="text" id="t2" readonly />
    </p>
</body>

</html>

Output:

Password-validation — Validate a password using HTML and JavaScript Example Output

JavaScript - How to Validate Form Using Regular Expression?

A

AnmolAgarwal

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Article Tags :

HTML

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