Identify what is written in the text Box

I'm not sure what the question is. Do you mean that you want to identify what the user typed in and react accordingly, with something like this?

• "If the user typed in a math problem, calculate the answer and display the result."


• "If the user typed in search terms, display the results from a Web search."

If that's not what you're trying to do, please be more specific about what you're trying to do.