# Livewire - Navigate

Source: https://livewire.laravel.com/docs/navigate

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Navigate
========

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Many modern web applications are built as "single page applications" (SPAs). In these applications, each page rendered by the application no longer requires a full browser page reload, avoiding the overhead of re-downloading JavaScript and CSS assets on every request.

The alternative to a *single page application* is a *multi-page application*. In these applications, every time a user clicks a link, an entirely new HTML page is requested and rendered in the browser.

While most PHP applications have traditionally been multi-page applications, Livewire offers a single page application experience via a simple attribute you can add to links in your application: `wire:navigate`.

#Basic usage
------------

Let's explore an example of using `wire:navigate`. Below is a typical Laravel routes file (`routes/web.php`) with three Livewire components defined as routes:

```php

use App\Livewire\Dashboard;

use App\Livewire\ShowPosts;

use App\Livewire\ShowUsers;

Route::get('/', Dashboard::class);

Route::get('/posts', ShowPosts::class);

Route::get('/users', ShowUsers::class);

```
By adding `wire:navigate` to each link in a navigation menu on each page, Livewire will prevent the standard handling of the link click and replace it with its own, faster version:

```php

<nav>

<a href="/" wire:navigate>Dashboard</a>

<a href="/posts" wire:navigate>Posts</a>

<a href="/users" wire:navigate>Users</a>

</nav>

```
Below is a breakdown of what happens when a `wire:navigate` link is clicked:

* User clicks a link
* Livewire prevents the browser from visiting the new page
* Instead, Livewire requests the page in the background and shows a loading bar at the top of the page
* When the HTML for the new page has been received, Livewire replaces the current page's URL, `<title>` tag and `<body>` contents with the elements from the new page

This technique results in much faster page load times — often twice as fast — and makes the application "feel" like a JavaScript powered single page application.

#Redirects
----------

When one of your Livewire components redirects users to another URL within your application, you can also instruct Livewire to use its `wire:navigate` functionality to load the new page. To accomplish this, provide the `navigate` argument to the `redirect()` method:

```php

return $this->redirect('/posts', navigate: true);

```
Now, instead of a full page request being used to redirect the user to the new URL, Livewire will replace the contents and URL of the current page with the new one.

#Prefetching links
------------------

By default, Livewire includes a gentle strategy to *prefetch* pages before a user clicks on a link:

* A user presses down on their mouse button
* Livewire starts requesting the page
* They lift up on the mouse button to complete the *click*
* Livewire finishes the request and navigates to the new page

Surprisingly, the time between a user pressing down and lifting up on the mouse button is often enough time to load half or even an entire page from the server.

If you want an even more aggressive approach to prefetching, you may use the `.hover` modifier on a link:

```php

<a href="/posts" wire:navigate.hover>Posts</a>

```
The `.hover` modifier will instruct Livewire to prefetch the page after a user has hovered over the link for `60` milliseconds.

Prefetching on hover increases server usage

Because not all users will click a link they hover over, adding `.hover` will request pages that may not be needed, though Livewire attempts to mitigate some of this overhead by waiting `60` milliseconds before prefetching the page.

#Persisting elements across page visits
---------------------------------------

Sometimes, there are parts of a user interface that you need to persist between page loads, such as audio or video players. For example, in a podcasting application, a user may want to keep listening to an episode as they browse other pages.

You can achieve this in Livewire with the `@persist` directive.

By wrapping an element with `@persist` and providing it with a name, when a new page is requested using `wire:navigate`, Livewire will look for an element on the new page that has a matching `@persist`. Instead of replacing the element like normal, Livewire will use the existing DOM element from the previous page in the new page, preserving any state within the element.

Here is an example of an `<audio>` player element being persisted across pages using `@persist`:

```php

@persist('player')

<audio src="{{ $episode->file }}" controls></audio>

@endpersist

```
If the above HTML appears on both pages — the current page, and the next one — the original element will be re-used on the new page. In the case of an audio player, the audio playback won't be interrupted when navigating from one page to another.

Please be aware that the persisted element must be placed outside your Livewire components. A common practice is to position the persisted element in your main layout, such as `resources/views/components/layouts/app.blade.php`.

```php

<!-- resources/views/components/layouts/app.blade.php -->

<!DOCTYPE html>

<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">

<head>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<title>{{ $title ?? 'Page Title' }}</title>

</head>

<body>

<main>

{{ $slot }}

</main>

@persist('player')

<audio src="{{ $episode->file }}" controls></audio>

@endpersist

</body>

</html>

```
### #Highlighting active links

You might be used to highlighting the currently active page link in a navbar using server-side Blade like so:

```php

<nav>

<a href="/" class="@if (request->is('/')) font-bold text-zinc-800 @endif">Dashboard</a>

<a href="/posts" class="@if (request->is('/posts')) font-bold text-zinc-800 @endif">Posts</a>

<a href="/users" class="@if (request->is('/users')) font-bold text-zinc-800 @endif">Users</a>

</nav>

```
However, this will not work inside persisted elements as they are re-used between page loads. Instead, you should use Livewire's `wire:current` directive to highlight the currently active link.

Simply pass any CSS classes you want to apply to the currently active link to `wire:current`:

```php

<nav>

<a href="/dashboard" ... wire:current="font-bold text-zinc-800">Dashboard</a>

<a href="/posts" ... wire:current="font-bold text-zinc-800">Posts</a>

<a href="/users" ... wire:current="font-bold text-zinc-800">Users</a>

</nav>

```
Now, when the `/posts` page is visited, the "Posts" link will have a stronger font treatment than the other links.

Read more in the `wire:current` documentation.

### #Preserving scroll position

By default, Livewire will preserve the scroll position of a page when navigating back and forth between pages. However, sometimes you may want to preserve the scroll position of an individual element you are persisting between page loads.

To do this, you must add `wire:scroll` to the element containing a scrollbar like so:

```php

@persist('scrollbar')

<div class="overflow-y-scroll" wire:scroll>

<!-- ... -->

</div>

@endpersist

```
#JavaScript hooks
-----------------

Each page navigation triggers three lifecycle hooks:

* `livewire:navigate`
* `livewire:navigating`
* `livewire:navigated`

It's important to note that these three hooks events are dispatched on navigations of all types. This includes manual navigation using `Livewire.navigate()`, redirecting with navigation enabled, and back and forward button presses in the browser.

Here's an example of registering listeners for each of these events:

```php

document.addEventListener('livewire:navigate', (event) => {

// Triggers when a navigation is triggered.

// Can be "cancelled" (prevent the navigate from actually being performed):

event.preventDefault()

// Contains helpful context about the navigation trigger:

let context = event.detail

// A URL object of the intended destination of the navigation...

context.url

// A boolean [true/false] indicating whether or not this navigation

// was triggered by a back/forward (history state) navigation...

context.history

// A boolean [true/false] indicating whether or not there is

// cached version of this page to be used instead of

// fetching a new one via a network round-trip...

context.cached

})

document.addEventListener('livewire:navigating', () => {

// Triggered when new HTML is about to swapped onto the page...

// This is a good place to mutate any HTML before the page

// is navigated away from...

})

document.addEventListener('livewire:navigated', () => {

// Triggered as the final step of any page navigation...

// Also triggered on page-load instead of "DOMContentLoaded"...

})

```
Event listeners will persist across pages

When you attach an event listener to the document it will not be removed when you navigate to a different page. This can lead to unexpected behaviour if you need code to run only after navigating to a specific page, or if you add the same event listener on every page. If you do not remove your event listener it may cause exceptions on other pages when it's looking for elements that do not exist, or you may end up with the event listener executing multiple times per navigation.

An easy method to remove an event listener after it runs is to pass the option `{once: true}` as a third parameter to the `addEventListener` function.

```php

document.addEventListener('livewire:navigated', () => {

// ...

}, { once: true })

```
#Manually visiting a new page
-----------------------------

In addition to `wire:navigate`, you can manually call the `Livewire.navigate()` method to trigger a visit to a new page using JavaScript:

```php

<script>

// ...

Livewire.navigate('/new/url')

</script>

```
#Using with analytics software
------------------------------

When navigating pages using `wire:navigate` in your app, any `<script>` tags in the `<head>` only evaluate when the page is initially loaded.

This creates a problem for analytics software such as Fathom Analytics. These tools rely on a `<script>` snippet being evaluated on every single page change, not just the first.

Tools like Google Analytics are smart enough to handle this automatically, however, when using Fathom Analytics, you must add `data-spa="auto"` to your script tag to ensure each page visit is tracked properly:

```php

<head>

<!-- ... -->

<!-- Fathom Analytics -->

@if (! config('app.debug'))

<script src="https://cdn.usefathom.com/script.js" data-site="ABCDEFG" data-spa="auto" defer></script>

@endif

</head>

```
#Script evaluation
------------------

When navigating to a new page using `wire:navigate`, it *feels* like the browser has changed pages; however, from the browser's perspective, you are technically still on the original page.

Because of this, styles and scripts are executed normally on the first page, but on subsequent pages, you may have to tweak the way you normally write JavaScript.

Here are a few caveats and scenarios you should be aware of when using `wire:navigate`.

### #Don't rely on `DOMContentLoaded`

It's common practice to place JavaScript inside a `DOMContentLoaded` event listener so that the code you want to run only executes after the page has fully loaded.

When using `wire:navigate`, `DOMContentLoaded` is only fired on the first page visit, not subsequent visits.

To run code on every page visit, swap every instance of `DOMContentLoaded` with `livewire:navigated`:

```php

-document.addEventListener('DOMContentLoaded', () => {

+document.addEventListener('livewire:navigated', () => {

// ...

})

```
Now, any code placed inside this listener will be run on the initial page visit, and also after Livewire has finished navigating to subsequent pages.

Listening to this event is useful for things like initializing third-party libraries.

### #Scripts in `<head>` are loaded once

If two pages include the same `<script>` tag in the `<head>`, that script will only be run on the initial page visit and not on subsequent page visits.

```php

<!-- Page one -->

<head>

<script src="/app.js"></script>

</head>

<!-- Page two -->

<head>

<script src="/app.js"></script>

</head>

```
### #New `<head>` scripts are evaluated

If a subsequent page includes a new `<script>` tag in the `<head>` that was not present in the `<head>` of the initial page visit, Livewire will run the new `<script>` tag.

In the below example, *page two* includes a new JavaScript library for a third-party tool. When the user navigates to *page two*, that library will be evaluated.

```php

<!-- Page one -->

<head>

<script src="/app.js"></script>

</head>

<!-- Page two -->

<head>

<script src="/app.js"></script>

<script src="/third-party.js"></script>

</head>

```
Head assets are blocking

If you are navigating to a new page that contains an asset like `<script src="...">` in the head tag. That asset will be fetched and processed before the navigation is complete and the new page is swapped in. This might be surprising behavior, but it ensures any scripts that depend on those assets will have immediate access to them.

### #Reloading when assets change

It's common practice to include a version hash in an application's main JavaScript file name. This ensures that after deploying a new version of your application, users will receive the fresh JavaScript asset, and not an old version served from the browser's cache.

But, now that you are using `wire:navigate` and each page visit is no longer a fresh browser page load, your users may still be receiving stale JavaScript after deployments.

To prevent this, you may add `data-navigate-track` to a `<script>` tag in `<head>`:

```php

<!-- Page one -->

<head>

<script src="/app.js?id=123" data-navigate-track></script>

</head>

<!-- Page two -->

<head>

<script src="/app.js?id=456" data-navigate-track></script>

</head>

```
When a user visits *page two*, Livewire will detect a fresh JavaScript asset and trigger a full browser page reload.

If you are using Laravel's Vite plug-in to bundle and serve your assets, Livewire adds `data-navigate-track` to the rendered HTML asset tags automatically. You can continue referencing your assets and scripts like normal:

```php

<head>

@vite(['resources/css/app.css', 'resources/js/app.js'])

</head>

```
Livewire will automatically inject `data-navigate-track` onto the rendered HTML tags.

Only query string changes are tracked

Livewire will only reload a page if a `[data-navigate-track]` element's query string (`?id="456"`) changes, not the URI itself (`/app.js`).

### #Scripts in the `<body>` are re-evaluated

Because Livewire replaces the entire contents of the `<body>` on every new page, all `<script>` tags on the new page will be run:

```php

<!-- Page one -->

<body>

<script>

console.log('Runs on page one')

</script>

</body>

<!-- Page two -->

<body>

<script>

console.log('Runs on page two')

</script>

</body>

```
If you have a `<script>` tag in the body that you only want to be run once, you can add the `data-navigate-once` attribute to the `<script>` tag and Livewire will only run it on the initial page visit:

```php

<script data-navigate-once>

console.log('Runs only on page one')

</script>

```
#Customizing the progress bar
-----------------------------

When a page takes longer than 150ms to load, Livewire will show a progress bar at the top of the page.

You can customize the color of this bar or disable it all together inside Livewire's config file (`config/livewire.php`):

```php

'navigate' => [

'show_progress_bar' => false,

'progress_bar_color' => '#2299dd',

],

```
On this page

* Basic usage
* Redirects
* Prefetching links
* Persisting elements across page visits
  + Highlighting active links
  + Preserving scroll position
* JavaScript hooks
* Manually visiting a new page
* Using with analytics software
* Script evaluation
  + Don't rely on DOMContentLoaded
  + Scripts in <head> are loaded once
  + New <head> scripts are evaluated
  + Reloading when assets change
  + Scripts in the <body> are re-evaluated
* Customizing the progress bar

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