Best way and easiest for a beginner to set up a numpad!
 

Hello,

I was wondering what the easiest and best way for a beginner like myself to set up a keypad with numbers only and have them incorporate it to a text area or box, basically the user will click the button and the number that is pressed will show up in the textarea or text box. I am wondering what the best way to do this is.
This is the line of code (an example of it) that I am working with. So my question is what is the best way to do this.

Thanks for the help.

Trying to remove this post bc I think it fits better in the javascript thread.