Detecting Whether a Vue/Vue Router Navigation was Triggered by the Back/Forward Button or a Manual Router Push

When using vue/vue-router, I have set up a watcher on $route that is triggered in two different ways:

  1. By clicking back or forward on the browser.
  2. When the user interacts with a form. There are watchers on the variables that the form uses, and these watchers update the URL using $router.push.

Within the watcher function for $route, how can I determine which of the two scenarios mentioned above has occurred?

The challenge lies in distinguishing between scenario 1 and scenario 2. If scenario 1 takes place, I need to manually update the form again. However, if scenario 2 happened, the form will already have been updated, so manual intervention is not necessary.

javascriptvue.jsvue-router

Answer №1

Looks like this is the solution

window.onpopstate = function(event) {
  console.log("location: " + document.location + ", state: " + JSON.stringify(event.state));
};

This code triggers when navigating back or forward, but not when manually changing the URL.

Answer №2

How can I determine which scenario occurred in the watcher function for $route?

It's not possible to know which scenario triggered the change within the callback of a watcher. The watcher will simply execute whenever the watched value changes, regardless of the cause.

If you specifically need to detect when the route changes due to the user clicking the back or forward browser buttons, you will have to listen for the popstate event and handle it accordingly.

If scenario 1 occurs, I need to manually update the form again. However, if scenario 2 happens, the form would have already been updated and I should avoid updating it again.

Updating the form on any change to the data in the URL parameters or query should not pose an issue. You can compare the URL data with the form data and only proceed with the update if they differ.

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