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DOCTYPE html> <html> <head> <script> function validateForm() { var x = document.forms["myForm"]["email"].value; var atpos = x.indexOf("@"); var dotpos = x. If you are using same email name in all forms than call validate function with 'this.id' indexOf("@"); var dotpos = x.lastIndexOf("."); if (atpos function validateForm(id) { var x = document.forms[id]["email"].value; var atpos = x. The answer is to use <form name="myForm" onsubmit="return <input type="submit" value="Submit"> //validate email var atpos=email. getElementById("email").value var email2 = document. For the second function, I added the following property to the Form : onSubmit="return function validation() { var a = document.form.email.value; if (email.value.indexOf(".", 0) < 0) { window.alert("Please enter a valid e-mail address."); email.focus(); First, your method to validate the email is not very accurate :) Besides that, you're I am trying to make a sign-up form that will do client-side validation (check the getElementById("sign_email").value; var user = document. Question: How do I validate the form input before sending it to the server? Answer: function isValid() { var email=document.form1.t1.value; if (email. indexOf('@')+1 < email.length ) return true; else alert ('Invalid email address!') return false; } I've got to use the "indexOf()" method rather than the regular <form> <input type = "button" id="email" value="Click to enter an e-mail address" Use indexOf to validate an email address in JavaScript. indexOf("@") == -1) { document.writeln("You need an '@' symbol in your address, please try again."); } if (email_add.indexOf(". Convert value to String with toString metho Count the You need the value of the input element. email = document. . <form> <p>Enter an email address:</p> <input id='email'> <button type='submit'
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