How to include only the necessary js for each page?

Probably better to have the checkboxes load a chunk with the full set of tags. If these will require specific .css files as well, a snippet using regClientCSS(), regClientStartupScript() and regClientScript() might be a better choice in the chunks since that way the files can be loaded where they are wanted.

Thanks for the answers, I'll try implementing it like this. Thanks to everyone for the kind responses!