html form required attribute field -


my form not honoring required attribute of "comments" field. want when user submits form, shows "please fill field", instead user can submit form straight away.

<form class="form-part" method="post" action="contact_form.php" name="contactform" id="contactform" onsubmit="return checkform1();">     <input id="name" type="text" name="name" size="30" title="name" required>     <input id="email" type="text" name="email" size="30" title="email" required>     <textarea rows="3" id="comments" name="comments" cols="40" title="tell think!" required></textarea>        <input type="submit"  name="submit" alt="send"> </form>

a simple check function might be:

function checkform1(frm){   if (frm.comments.value==''){     alert('please leave comment.' );     return false;   else return true; }

for work need augment form tag to:

<form ... onsubmitt="return checkform1(this)">

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