How to change input border-color, with jQuery, depending on its value?

Question

I have question about jQuery. I have code below which works fine; it changes input border-color depending on its value, which is typed and entered. But

Answer 1

Just trigger the event:

$("input").change(function() {
    // ...
}).trigger("change");

DEMO: http://jsfiddle.net/9B5SX/1/