It's a common task that you need to check if your single checkbox 

is checked or not before doing something with that.

Adding scripts and styles in wordpress is different from 

what we do in a normal php sites of course.

JSON is JavaScript Object Notation 

You may be required to select all <p> elements with specific class 

or other ways using jquery.

The jquery ajax() method is used to do AJAX (asynchronous HTTP) request. As we  know ajax is used to do things without loading the page. 

it is easier to print part of page.the part of the page
may be under a div or panel.you can achieve this from code
behind file too as per requirement.here i showing only
in page lavel -

the following javascript codes will help you find
out the browser details by some javascript functions