javascript error 'email' is not defined.[no-undef]
function confirmInput() { email = document.forms[0].email.value; alert("Hello " + email + "; You are now subscribet to our page"); }
<form onsubmit="confirmInput()" action="php/email.php" class="offer-form" method="post" name="validate"> <input id="email" type="text" class="txtb" name="email" placeholder="Enter Your Email" required> <input type="submit" class="sub" value="Submit">
Your variable email is not defined. This mean you should add var before email.
var email = document.forms[0].elements.namedItem("email").value;
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