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jquerykeypress

Only allow numbers, decimals, negative

I have this code that only permits numbers to be entered in an input field on keypress()

if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
    return false;
}

How can I also allow decimals, and minus keypress?

Solution

  • This is a solution, but I recommend to use mask plugin, for example: jQuery-Mask-Plugin

    $("#id").keypress(function(e){
  if (e.which != 46 && e.which != 45 && e.which != 46 &&
      !(e.which >= 48 && e.which <= 57)) {
    return false;
  }
});
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="id" />