OnKeyPress problem.

I try the following code to get the value of a textbox:

<input type='text' OnKeyPress='alert(this.value)'>

PHP:

The problem is that I always get the word minus last letter.

For example:
User enters "A", alert returns "".
User enters "B", alert retuns "A".
User enters "C", alert returns "AB".

I have tried OnKeyUp and OnKeyDown as well.
Is there any event that I can use to get the whole word and not one letter less?

 

The 'onchange' event should supply the input's value after the keyboard event that caused it.