How to auto format textbox inputs

Question

   Birthdate
      
   <         


        

Answer 1

user2897690 had the right idea but it didn't accept Numpad numbers. So took their javascript and modified it to work.

Here is my interpretation of their code with the added feature.

$("input[name='birthdate']:first").keyup(function(e){
    var chars = [48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105];
    var key=chars.indexOf(e.keyCode);
    console.log(key);
    if(key==-1)$(this).val($(this).val().substr(0,$(this).val().length-1));
    var value=$(this).val();
    if(value.length==2||value.length==5)$(this).val($(this).val()+'/');
});