javascript - allowing input only for float number

Question

I have pain-time when making input that only allows float number with jquery library. my code can't prevent chacacter "." when it's becoming first input, can anyone guide me to solve this problem?

$('.filterme').keypress(function(eve) {
   if (    ( eve.which != 46 || $(this).val().indexOf('.') != -1 ) 
        && ( eve.which <  48 || eve.which > 57 ) 
        || ( $(this).val().indexOf('.') == 0) 
      )
   {
       eve.preventDefault();
   }
});?

Answer 1

I use this - works for keyboard input or copy and paste

$('input.float').on('input', function() {
  this.value = this.value.replace(/[^0-9.]/g, '').replace(/(..*?)..*/g, '$1');
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<input type="text" class="float" />