How to make the documents writable through the screen?

Question

I have a web application which generate reports .

I want to allow these reports to be hand writable on the screen .

I mean that i can write some notes or sign on those documents through the screen by Light Pen.

I don't know where should i begin to implement something like that or the the start point to search from .

I want some searches and libraries to use .

Answer 1

In general speaking, the Canvas can be used to write on web page screen with a tablet or a mouse. Then you send that image on the server with a post back and save it.

read the details on how Creating an HTML5 canvas painting application

Here is an example, select the Pencil, and write on. http://devfiles.myopera.com/articles/649/example5.html

If you like to make it more complicate, then look at this library:
http://experiments.hertzen.com/jsfeedback/

is converting what you see on page into canvas (image) on the fly, then you can write on it as image, and then you can post back to the server.