# History

## Updating url and title

When users are scrolling through pages we can update the browser url and page title. This allows the current page to be shared or bookmarked.

We can achieve this by listening for the [`page`](https://github.com/webcreate/infinite-ajax-scroll/blob/master/docs/advanced/events.md#page) event. The page event contains the `url` and `title` of the current page in view.

The [History API](https://developer.mozilla.org/en-US/docs/Web/API/History_API) can be used to update the url.

```javascript
ias.on('page', (event) => {
  // update the title
  document.title = event.title;

  // update the url
  let state = history.state;
  history.replaceState(state, event.title, event.url);
});
```

[View this behaviour in a live demo](https://infiniteajaxscroll.com/examples/articles/)

## Loading previous pages

Infinite Ajax Scroll can also be used to load items above the current scroll position. This is useful when you want to load older items first.

[View upwards infinite scroll documentation](/advanced/upwards.md)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.infiniteajaxscroll.com/advanced/history.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.