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Docs/interactivity api router package readme (#62062)
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* Updated intro to the package

* removed examples and demos

* update README.md

* Query Loop reference

* fixed typo

* Wording improved

* Interactivity API: Update and expand on the interactivity-router docs

* Update the inline HTML in the callout

---------

Co-authored-by: Michal Czaplinski <mmczaplinski@gmail.com>
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# Interactivity Router
# `@wordpress/interactivity-router`

> **Note**
> This package is a extension of the API shared at [Proposal: The Interactivity API – A better developer experience in building interactive blocks](https://make.wordpress.org/core/2023/03/30/proposal-the-interactivity-api-a-better-developer-experience-in-building-interactive-blocks/). As part of an [Open Source project](https://developer.wordpress.org/block-editor/getting-started/faq/#the-gutenberg-project) we encourage participation in helping shape this API and the [discussions in GitHub](https://github.com/WordPress/gutenberg/discussions/categories/interactivity-api) is the best place to engage.
The package `@wordpress/interactivity-router` enables loading content from other pages without a full page reload. Currently, the only supported mode is "region-based". Full "client-side navigation" is still in experimental phase.

This package defines an Interactivity API store with the `core/router` namespace, exposing state and actions like `navigate` and `prefetch` to handle client-side navigations.
The package defines an Interactivity API store with the `core/router` namespace, exposing state and 2 actions: `navigate` and `prefetch` to handle client-side navigation.

The `@wordpress/interactivity-router` package was [introduced in WordPress Core in v6.5](https://make.wordpress.org/core/2024/02/19/merge-announcement-interactivity-api/). This means this package is already bundled in Core in any version of WordPress higher than v6.5.

<div class="callout callout-info">
Check the <a href="https://developer.wordpress.org/block-editor/reference-guides/interactivity-api/">Interactivity API Reference docs in the Block Editor handbook</a> to learn more about the Interactivity API.
</div>

## Usage

The package is intended to be imported dynamically in the `view.js` files of interactive blocks.
The package is intended to be imported dynamically in the `view.js` files of interactive blocks. This is done in in order to reduce the JS bundle size on the initial page load.

```js
/* view.js */

import { store } from '@wordpress/interactivity';

store( 'myblock', {
// This is how you would typically use the navigate() action in your block.
store( 'my-namespace/myblock', {
actions: {
*navigate( e ) {
*goToPage( e ) {
e.preventDefault();

// We import the package dynamically to reduce the initial JS bundle size.
// Async actions are defined as generators so the import() must be called with `yield`.
const { actions } = yield import(
'@wordpress/interactivity-router'
);
Expand All @@ -25,52 +36,116 @@ store( 'myblock', {
} );
```

## Frequently Asked Questions
Now, you can call `actions.navigate()` in your block's `view.js` file to navigate to a different page or e.g. pass it to a `data-wp-on--click` attribute.

When loaded, this package [adds the following state and actions](https://github.com/WordPress/gutenberg/blob/ed7d78652526270b63976d7a970dba46a2bfcbb0/packages/interactivity-router/src/index.ts#L212) to the `core/router` store:

```js
const { state, actions } = store( 'core/router', {
state: {
url: window.location.href,
navigation: {
hasStarted: false,
hasFinished: false,
texts: {
loading: '',
loaded: '',
},
message: '',
},
},
actions: {
*navigate(href, options) {...},
prefetch(url, options) {...},
}
})
```

<div class="callout callout-tip">
The core "Query Loop" block is <a href="https://github.com/WordPress/gutenberg/blob/cd701e94ceffea7ef2f423274a2f77025bcfa1a6/packages/block-library/src/query/view.js#L35">using this package</a> to provide the <a href="https://github.com/WordPress/gutenberg/blob/cd701e94ceffea7ef2f423274a2f77025bcfa1a6/packages/block-library/src/query/index.php#L33">region-based navigation</a>.
</div>

### Directives

#### `data-wp-router-region`

It defines a region that is updated on navigation. It requires a unique ID as the value and can only be used in root interactive elements, i.e., elements with `data-wp-interactive` that are not nested inside other elements with `data-wp-interactive`.

Example:

```html
<div data-wp-interactive="myblock" data-wp-router-region="main-list">
<ul>
<li><a href="/post-1">Post 1</a></li>
<li><a href="/post-2">Post 2</a></li>
<li><a href="/post-3">Post 3</a></li>
</ul>
<a data-wp-on--click="actions.navigate" href="/page/2">
</div>
```

### Actions

#### `navigate`

Navigates to the specified page.

At this point, some of the questions you have about the Interactivity API may be:
This function normalizes the passed `href`, fetches the page HTML if needed, and updates any interactive regions whose contents have changed in the new page. It also creates a new entry in the browser session history.

### What is this?
**Params**

This is the base of a new standard to create interactive blocks. Read [the proposal](https://make.wordpress.org/core/2023/03/30/proposal-the-interactivity-api-a-better-developer-experience-in-building-interactive-blocks/) to learn more about this.
```js
navigate( href: string, options: NavigateOptions = {} )
```

### Can I use it?
- `href`: The page `href`.
- `options`: Options object.
- `force`: If `true`, it forces re-fetching the URL. `navigate()` always caches the page, so if the page has been navigated to before, it will be used. Default is `false`.
- `html`: HTML string to be used instead of fetching the requested URL.
- `replace`: If `true`, it replaces the current entry in the browser session history. Default is `false`.
- `timeout`: Time until the navigation is aborted, in milliseconds. Default is `10000`.
- `loadingAnimation`: Whether an animation should be shown while navigating. Default to `true`.
- `screenReaderAnnouncement`: Whether a message for screen readers should be announced while navigating. Default to `true`.

You can test it, but it's still very experimental.
#### `prefetch`

### How do I get started?
Prefetches the page for the passed URL. The page is cached and can be used for navigation.

The best place to start with the Interactivity API is this [**Getting started guide**](https://github.com/WordPress/gutenberg/blob/trunk/packages/interactivity/docs/1-getting-started.md). There you'll will find a very quick start guide and the current requirements of the Interactivity API.
The function normalizes the URL and stores internally the fetch promise, to avoid triggering a second fetch for an ongoing request.

### Where can I ask questions?
**Params**

The [“Interactivity API” category](https://github.com/WordPress/gutenberg/discussions/categories/interactivity-api) in Gutenberg repo discussions is the best place to ask questions about the Interactivity API.
```js
prefetch( url: string, options: PrefetchOptions = {} )
```

### Where can I share my feedback about the API?
- `url`: The page `url`.
- `options`: Options object.

The [“Interactivity API” category](https://github.com/WordPress/gutenberg/discussions/categories/interactivity-api) in Gutenberg repo discussions is also the best place to share your feedback about the Interactivity API.
- `force`: If `true`, forces fetching the URL again.
- `html`: HTML string to be used instead of fetching the requested URL.

### State

`state.url` is a reactive property synchronized with the current URL.
Properties under `state.navigation` are meant for loading bar animations.

## Installation

Install the module:

```bash
npm install @wordpress/interactivity --save
npm install @wordpress/interactivity-router --save
```

_This package assumes that your code will run in an **ES2015+** environment. If you're using an environment that has limited or no support for such language features and APIs, you should include [the polyfill shipped in `@wordpress/babel-preset-default`](https://github.com/WordPress/gutenberg/tree/HEAD/packages/babel-preset-default#polyfill) in your code._

## Docs & Examples
This step is only required if you use the Interactivity API outside WordPress.

**[Interactivity API Documentation](https://github.com/WordPress/gutenberg/tree/trunk/packages/interactivity/docs)** is the best place to learn about this proposal. Although it's still in progress, some key pages are already available:
Within WordPress, the package is already bundled in Core. To ensure it's enqueued, add `@wordpress/interactivity-router` to the dependency array of the script module. This process is often done automatically with tools like [`wp-scripts`](https://developer.wordpress.org/block-editor/getting-started/devenv/get-started-with-wp-scripts/).

- **[Getting Started Guide](https://github.com/WordPress/gutenberg/blob/trunk/packages/interactivity/docs/1-getting-started.md)**: Follow this Getting Started guide to learn how to scaffold a new project and create your first interactive blocks.
- **[API Reference](https://github.com/WordPress/gutenberg/blob/trunk/packages/interactivity/docs/2-api-reference.md)**: Check this page for technical detailed explanations and examples of the directives and the store.
Furthermore, this package assumes your code will run in an **ES2015+** environment. If you're using an environment with limited or no support for such language features and APIs, you should include the polyfill shipped in [`@wordpress/babel-preset-default`](https://github.com/WordPress/gutenberg/tree/HEAD/packages/babel-preset-default#polyfill) in your code.

Here you have some more resources to learn/read more about the Interactivity API:
## License

- **[Interactivity API Discussions](https://github.com/WordPress/gutenberg/discussions/52882)**
- [Proposal: The Interactivity API – A better developer experience in building interactive blocks](https://make.wordpress.org/core/2023/03/30/proposal-the-interactivity-api-a-better-developer-experience-in-building-interactive-blocks/)
- Developer Hours sessions ([Americas](https://www.youtube.com/watch?v=RXNoyP2ZiS8&t=664s) & [APAC/EMEA](https://www.youtube.com/watch?v=6ghbrhyAcvA))
- [wpmovies.dev](http://wpmovies.dev/) demo and its [wp-movies-demo](https://github.com/WordPress/wp-movies-demo) repo
Interactivity API proposal, as part of Gutenberg and the WordPress project is free software, and is released under the terms of the GNU General Public License version 2 or (at your option) any later version. See [LICENSE.md](https://github.com/WordPress/gutenberg/blob/trunk/LICENSE.md) for complete license.

<br /><br /><p align="center"><img src="https://s.w.org/style/images/codeispoetry.png?1" alt="Code is Poetry." /></p>
<br/><br/><p align="center"><img src="https://s.w.org/style/images/codeispoetry.png?1" alt="Code is Poetry." /></p>

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