What is the method for printing a webpage that has been modified using JavaScript?

Take a look at this screenshot to see what I'm working with.

Users have the ability to modify the page by removing items, adding new items, or marking items as complete by crossing them out. I want users to be able to print the altered page using JavaScript. It seems that in order to enable printing, a separate file with different stylesheet settings needs to be created.

Currently, I am using Rails 4 and considering using this method to generate a PDF for users.

1) I am unsure of how to create the document with the correct modifications such as deletions, additions, and crossed out items.

2) Additionally, I am unsure of how to generate the document without including unnecessary elements like navigation (which is not needed in the printed list). My initial thought was to hide it using CSS.

javascriptcssruby-on-railspdfprinting

Answer №1

1) Are the changes made by the customer on the client-side? If so, keep track of all the user's changes and send them as a parameter to Rails when the user clicks "print" so that the correct information can be rendered from your Rails action.

Typically, in a Rails/JavaScript application, when the user interacts with the client-side using JavaScript, it triggers some AJAX code that notifies the Rails application about the changes. This way, you can store the new state in the Rails database for later use. You can also store the application's state in a session or temporary cache.

2) This is exactly what I do to customize what the user is printing. I hide the classes I don't want to print in the HTML. When including the CSS, you can specify that the styles should be applied to printed documents by using the media print attribute, like this:

stylesheet_link_tag "my_style", media: "print"

However, in this case, it seems like you are not using the browser's printing feature. Based on your question, it appears you will be generating a PDF. In that case, you will render a view from Rails. You can either add a parameter to inform the view that it is for printing (to allow for custom CSS or to exclude the navigation bar) or you can call a different action with custom code/view for generating the PDF.

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