Validate zip and display error with onBlur event

Check if zip is 5 digit number, if not then display 'zip is invalid'. I want to use onBlur event to trigger the display. But it's not working.

<script>
$(function(){

function valid_zip()
  {
  var pat=/^[0-9]{5}$/;
  if ( !pat.test(   $('#zip').val()   ) )
     {$('#zip').after('<p>zip is invalid</p>');}
  }

})
</script>

zip (US only) <input type="text" name='zip' id='zip' maxlength="5" onblur="valid_zip开发者_如何学运维()">

$('#zip').blur(function()
  {
  var pat=/^[0-9]{5}$/;
  if ( !pat.test(   $(this).val()   ) )
     {$(this).after('<p>zip is invalid</p>');}

})

you are now using jQuery, don't do inline coding...

<input type="text" name='zip' id='zip' maxlength="5" onBlur="valid_zip()">

should just be

<input type="text" name='zip' id='zip' maxlength="5">

It should look more like this:

<script>
        $(function(){

                $("#zip").blur(function() {
                        var pat=/^[0-9]{5}$/;
                        if ( !pat.test( $('#zip').val() ) )
                            $('#zip').after('<p>zip is invalid</p>');
                });
        });
    </script>

    zip (US only) <input type="text" name='zip' id='zip' maxlength="5">

onblur should be all lowercase.

<input type="text" name="zip" id="zip" maxlength="5" onblur="valid_zip()">

Also, why are putting valid_zip inside $() - you can just do:

<script>
  function valid_zip()
  {
    var pat=/^[0-9]{5}$/;
    if ( !pat.test(   $('#zip').val()   ) )
    {
      $('#zip').after('<p>zip is invalid</p>');
    }
  }
</script>