navigation.js
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"use strict";
const whatwgURL = require("whatwg-url");
const notImplemented = require("../../browser/not-implemented.js");
const reportException = require("../helpers/runtime-script-errors.js");
const idlUtils = require("../generated/utils.js");
exports.evaluateJavaScriptURL = (window, urlRecord) => {
const urlString = whatwgURL.serializeURL(urlRecord);
const scriptSource = whatwgURL.percentDecode(Buffer.from(urlString)).toString();
if (window._runScripts === "dangerously") {
try {
return window.eval(scriptSource);
} catch (e) {
reportException(window, e, urlString);
}
}
return undefined;
};
// https://html.spec.whatwg.org/#navigating-across-documents
exports.navigate = (window, newURL, flags) => {
// This is NOT a spec-compliant implementation of navigation in any way. It implements a few selective steps that
// are nice for jsdom users, regarding hash changes and JavaScript URLs. Full navigation support is being worked on
// and will likely require some additional hooks to be implemented.
if (!window._document) {
return;
}
const document = idlUtils.implForWrapper(window._document);
const currentURL = document._URL;
if (!flags.reloadTriggered && urlEquals(currentURL, newURL, { excludeFragments: true })) {
if (newURL.fragment !== currentURL.fragment) {
navigateToFragment(window, newURL, flags);
}
return;
}
// NOT IMPLEMENTED: Prompt to unload the active document of browsingContext.
// NOT IMPLEMENTED: form submission algorithm
// const navigationType = 'other';
// NOT IMPLEMENTED: if resource is a response...
if (newURL.scheme === "javascript") {
setTimeout(() => {
const result = exports.evaluateJavaScriptURL(window, newURL);
if (typeof result === "string") {
notImplemented("string results from 'javascript:' URLs", window);
}
}, 0);
return;
}
navigateFetch(window);
};
// https://html.spec.whatwg.org/#scroll-to-fragid
function navigateToFragment(window, newURL, flags) {
const document = idlUtils.implForWrapper(window._document);
window._sessionHistory.clearHistoryTraversalTasks();
if (!flags.replacement) {
// handling replacement=true here deviates from spec, but matches real browser behaviour
// see https://github.com/whatwg/html/issues/2796 for spec bug
window._sessionHistory.removeAllEntriesAfterCurrentEntry();
}
const newEntry = { document, url: newURL };
window._sessionHistory.addEntryAfterCurrentEntry(newEntry);
window._sessionHistory.traverseHistory(newEntry, { nonBlockingEvents: true, replacement: flags.replacement });
}
// https://html.spec.whatwg.org/#process-a-navigate-fetch
function navigateFetch(window) {
// TODO:
notImplemented("navigation (except hash changes)", window);
}
// https://url.spec.whatwg.org/#concept-url-equals
function urlEquals(a, b, flags) {
const serializedA = whatwgURL.serializeURL(a, flags.excludeFragments);
const serializedB = whatwgURL.serializeURL(b, flags.excludeFragments);
return serializedA === serializedB;
}