javascript - form validation using java script -


following form validates using javascript,but not working. still takes action,instead of showing error.i cant figure out wrong code. seems fine. can show me mistakes?

    <script type='text/javascript'>  function formvalidator(){      var name = document.getelementbyid('name');     var alpha = /^[a-za-z]+$/;      if(!alpha.test.(name.value)){         alert('please provide valid name');         name.focus;         return false;      }      var email = document.getelementbyid('email');     var filter = /^([a-za-z0-9_\.\-])+\@(([a-za-z0-9\-])+\.)+([a-za-z0-9]{2,4})+$/;      if (!filter.test(email.value)) {     alert('please provide valid email address');     email.focus;     return false;  } } </script>  <div id="contact_form">                      <p>stay connected.</p>                             </div>   <form name="contact" method="post" action="sendmail.php" onsubmit='return formvalidator();'>     <fieldset>       <label for="name" id="name_label">your name *</label>       <input type="text" name="name" id="name" size="50" value="" class="text-input" required  />         <label for="email" id="email_label">your email address *</label>      <input type="text" name="email" id="email" />            <br />       <input type="submit" name="submit" class="button btn btn-primary btn-info" id="submit_btn" value="send" onclick='javascript:formvalidator();'/>     </fieldset>   </form>   dont want use html5 validation.

this error in console

syntaxerror: missing name after . operator [break on error]     if(!alpha.test.(name.value)){

so use

if (!filter.test(name.value))  instead of if(!alpha.test.(name.value)){

remove .


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