How to use jQuery to onsubmit and check if the value is 2 - 5 characters?

Question

Let\'s say I have a text field:

Username: 

Answer 1

I made a Fiddle

You can use a statement as

$(document).ready(function(){  
    $("#form").submit(function(e) {
       length = $("#username").val().length;
       if((length > 2 && length < 5)) {
           $("#output").html("correct, logging in");
       } else {
           $("#output").html("incorrect, must have 3 or 4 chars");
       }
       return (length > 2 && length < 5);
    });
});

And HTML

username: