jquery keyup function check if number

Question

i am trying to create an input field where the user can only type in numbers. this function is already working almost fine for me:

        $(\'#p_first\').k         


        

Answer 1

JavaScript:

  function isNumberKey(a){
  var x=a.val();
  a.val(x.replace(/[^0-9\.]/g,''));

}

HTML: