Vanilla JavaScript History API

Yesterday we had a brief introduction to the History API, by using the pushState method.

Today we'll be diving more into the History API and see what other elements we can use.

JavaScript Browser API Back and Forward permalink

So instead of refreshing the current URL sometimes, we want to navigate true the history programmatically. The History API has three methods of doing so:

• back() Same as clicking the back button in the browser
• forward() Same as clicking the forward button
• go() We can go to a specific index forward (1) or backward (-1)

In action the back() method looks like this:

window.history.back();

The forward() in turn looks like this:

window.history.forward();

And the go() we can use like this:

window.history.go(-1); // back
window.history.go(1); // forward
window.history.go(0); // refresh
window.history.go(); // refresh

You can determine how many pages are in the history by using the following command:

const numberInHistory = window.history.length;

JavaScript History API replaceState permalink

As we saw we can use pushState to change the current state, we can also use replaceState for this:

history.replaceState({ page: 'unicorn' }, 'Unicorn', '/Unicorn');

Browser Support permalink

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