Get value from the webpage through id

I have installed the plugin today, so I am new to it.

I want to insert the value inside a div on my webpage to the message sent to a person through email. The main reason is that I want to obtain the data entered by user.

I am also creating a pdf file of that data through jspdf. So, if I can attach that pdf file to the mail, iy will be great.

Please suggest me a solution for any one of these two questions. One of them will solve purpose.

Thanks