ContextQMD
Back to Content

Navigation: back() method

files/en-us/web/api/navigation/back/index.md

latest2.6 KB
Original Source

{{APIRef("Navigation API")}}

The back() method of the {{domxref("Navigation")}} interface navigates backwards by one entry in the navigation history.

Syntax

js-nolint
back(options)

Parameters

  • options {{optional_inline}}
    • : An options object containing the following properties:
      • info {{optional_inline}}
        • : Developer-defined information to be passed along to the {{domxref("Navigation/navigate_event", "navigate")}} event, made available in {{domxref("NavigateEvent.info")}}. This can be any data type. You might, for example, wish to display newly-navigated content with a different animation depending on how it was navigated to (swipe left, swipe right, or go home). A string indicating which animation to use could be passed in as info.

Return value

An object with the following properties:

  • committed
    • : A {{jsxref("Promise")}} which will fulfill when the visible URL has changed and a new {{domxref("NavigationHistoryEntry")}} has been created.
  • finished
    • : A {{jsxref("Promise")}} which will fulfill when all promises returned by the intercept() handler are fulfilled. This is equivalent to the {{domxref("NavigationTransition.finished")}} promise fulfilling, when the {{domxref("Navigation/navigatesuccess_event", "navigatesuccess")}} event fires.

Either one of these promises rejects if the navigation has failed for some reason.

Exceptions

  • InvalidStateError {{domxref("DOMException")}}
    • : Thrown if the {{domxref("Navigation.currentEntry")}}'s {{domxref("NavigationHistoryEntry.index")}} value is -1 or 0, i.e., either the current {{domxref("Document")}} is not yet active, or the current history entry is the first one in the history, meaning that backwards navigation is not possible, or if the current {{domxref("Document")}} is unloading.

Examples

js
async function backHandler() {
  if (navigation.canGoBack) {
    await navigation.back().finished;
    // Handle any required clean-up after
    // navigation has finished
  } else {
    displayBanner("You are on the first page");
  }
}

async function forwardHandler() {
  if (navigation.canGoForward) {
    await navigation.forward().finished;
    // Handle any required clean-up after
    // navigation has finished
  } else {
    displayBanner("You are on the last page");
  }
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also