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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/NavigateEvent/navigationType below:

NavigateEvent: navigationType property - Web APIs

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The navigationType read-only property of the NavigateEvent interface returns the type of the navigation — push, reload, replace, or traverse.

An enumerated value representing the type of navigation.

The possible values are:

• push: A new location is navigated to, causing a new entry to be pushed onto the history list.
• reload: The Navigation.currentEntry is reloaded.
• replace: The Navigation.currentEntry is replaced with a new history entry. This new entry will reuse the same key, but be assigned a different id.
• traverse: The browser navigates from one existing history entry to another existing history entry.

Sometimes it's desirable to handle back/forward navigations specially, e.g., reusing cached views by transitioning them onto the screen. This can be done by branching as follows:

navigation.addEventListener("navigate", (event) => {
  // Some navigations, e.g. cross-origin navigations, we
  // cannot intercept. Let the browser handle those normally.
  if (!event.canIntercept) {
    return;
  }

  // Don't intercept fragment navigations or downloads.
  if (event.hashChange || event.downloadRequest !== null) {
    return;
  }

  event.intercept({
    async handler() {
      if (myFramework.currentPage) {
        await myFramework.currentPage.transitionOut();
      }

      let { key } = event.destination;

      if (
        event.navigationType === "traverse" &&
        myFramework.previousPages.has(key)
      ) {
        await myFramework.previousPages.get(key).transitionIn();
      } else {
        // This will probably result in myFramework storing
        // the rendered page in myFramework.previousPages.
        await myFramework.renderPage(event.destination);
      }
    },
  });
});

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