Skip to content

Phone Number Validation Javascript

mobile validation

Phone number validation is an important part of validating an HTML form. On this artilce we will discussed how to validate a phone number in javascript. We made Phone number validation example after lots of trial, help using regular expression.
We solve this format. xxx-xx-xxxxxx

Notes : Fresher Need To Understand Regular Expression.

 <script type="text/javascript">
    function ValidateForm(){
        var ValidString = document.forms["myform"]["txtPhone"].value;
        var regexObj = /^(?([0-9]{3}))?[-. ]?([0-9]{2})[-. ]?([0-9]{8})$/;

        if (regexObj.test(ValidString)) {
            var formattedPhoneNumber =
                subjectString.replace(regexObj, "($1) $2-$3");
        } else {
            alert("Invalid phone number");
            return false;

  <form id="myform" name="myform" method="POST" action="" onsubmit="return ValidateForm();">
    <input type="text" name="txtPhone" id="txtPhone">
    <input type="submit" name="submit" id="submit" value="I Agree">