Facebook/Twitter usernames validation

by aprudencio

HTML

Facebook <input type="text" id="facebook" />
<br/>
Twitter <input type="text" id="twitter" />

<br/>
fb count: <span id="fbc"></span>
<br/>
tw count: <span id="twc"></span>
<br />
<div id="ee">9</div>

JavaScript

var t = 0;
var f = 0;

$("#twitter").keypress(function (event) {
   
    if(event.keyCode >= 65 && event.keyCode <= 90 || event.keyCode >= 97 && event.keyCode <= 122) //letters
      return true;  
    if(event.keyCode >= 48 && event.keyCode <= 57) //numbers
      return true;  
     if(event.keyCode == 95) //_ 
      return true;      
    
    return false;
}).keyup(function () {$(this).val($(this).val().toLowerCase())}).attr("maxlength","15");

$("#facebook").keypress(function (event) {
     f++;
    $("#fbc").html(f);
    $("#ee").html(event.keyCode)
    if(event.keyCode >= 65 && event.keyCode <= 90 || event.keyCode >= 97 && event.keyCode <= 122) //letters
      return true;  
    if(event.keyCode >= 48 && event.keyCode <= 57) //numbers
      return true;  
     if(event.keyCode == 46) //. 
      return true;      
    //$(this).val(event.keyCode);
    return false;
    ;
}).keyup(function () {$(this).val($(this).val().toLowerCase())}).attr("maxlength","25");