klammertext/sks/link/js/link.js

// In-text links to a section on another (or the same) page of a book:
// <a class="pagelink" data-page="BASENAME" data-id="ID">, which @document
// emits for @link ... :section @ (document_html.cpp, resolve_section_links).
// go_to_section() swaps in the embedded page and scrolls to the id, and
// calls this again for the links of the page it just showed.  Each anchor
// is bound once: a page shown twice is the same nodes bound twice otherwise.
function set_link_listeners() {
    Array.from(document.getElementsByClassName("pagelink")).forEach(
        function (elt) {
            if (elt.getAttribute("data-bound")) {
                return;
            }
            elt.setAttribute("data-bound", "true");
            elt.addEventListener("click", function(event) {
                event.preventDefault();
                let basename = elt.getAttribute("data-page");
                let id = elt.getAttribute("data-id");
                go_to_section(elt, basename, id);
            });
        });
}

window.addEventListener("load", set_link_listeners);