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This is documentation for Inertia.js v1, which is no longer actively maintained. Please refer to the v2 docs for the latest information.
Since Inertia requests are made via XHR, there would typically not be a browser loading indicator when navigating from one page to another. To solve this, Inertia displays a progress indicator at the top of the page whenever you make an Inertia visit. Of course, if you prefer, you can disable Inertia’s default loading indicator and provide your own custom implementation. We’ll discuss both approaches below.

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Default

Inertia’s default progress indicator is a light-weight wrapper around the NProgress library. You can customize it via the progress property of the createInertiaApp() function. 
createInertiaApp({
progress: {
// The delay after which the progress bar will appear, in milliseconds...
delay: 250,
// The color of the progress bar...
color: '#29d',
// Whether to include the default NProgress styles...
includeCSS: true,
// Whether the NProgress spinner will be shown...
showSpinner: false,
},
// ...
})
You can disable Inertia’s default loading indicator by setting the progress property to false. 
createInertiaApp({
progress: false,
// ...
})

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Custom

It’s also possible to setup your own custom page loading indicators using Inertia events. Let’s explore how to do this using the NProgress library as an example. First, disable Inertia’s default loading indicator. 
createInertiaApp({
progress: false,
// ...
})
Next, install the NProgress library. 
npm install nprogress
After installation, you’ll need to add the NProgress styles to your project. You can do this using a CDN hosted copy of the styles. 
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/nprogress/0.2.0/nprogress.min.css" />
Next, import both NProgress and the Inertia router into your application. 
import NProgress from 'nprogress'
import { router } from '@inertiajs/vue2'
Next, let’s add a start event listener. We’ll use this listener to show the progress bar when a new Inertia visit begins. 
router.on('start', () => NProgress.start())
Then, let’s add a finish event listener to hide the progress bar when the page visit finishes. 
router.on('finish', () => NProgress.done())
That’s it! Now, as you navigate from one page to another, the progress bar will be added and removed from the page.

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Handling Cancelled Visits

While this custom progress implementation works great for page visits that finish properly, it would be nice to handle cancelled visits as well. First, for interrupted visits (those that get cancelled as a result of a new visit), the progress bar should simply be reset back to the start position. Second, for manually cancelled visits, the progress bar should be immediately removed from the page. We can accomplish this by inspecting the event.detail.visit object that’s provided to the finish event. 
router.on('finish', (event) => {
if (event.detail.visit.completed) {
NProgress.done()
} else if (event.detail.visit.interrupted) {
NProgress.set(0)
} else if (event.detail.visit.cancelled) {
NProgress.done()
NProgress.remove()
}
})

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File Upload Progress

Let’s take this a step further. When files are being uploaded, it would be great to update the loading indicator to reflect the upload progress. This can be done using the progress event. 
router.on('progress', (event) => {
if (event.detail.progress.percentage) {
NProgress.set((event.detail.progress.percentage / 100) * 0.9)
}
})
Now, instead of the progress bar “trickling” while the files are being uploaded, it will actually update it’s position based on the progress of the request. We limit the progress here to 90%, since we still need to wait for a response from the server.

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Loading Indicator Delay

The last thing we’re going to implement is a loading indicator delay. It’s often preferable to delay showing the loading indicator until a request has taken longer than 250-500 milliseconds. This prevents the loading indicator from appearing constantly on quick page visits, which can be visually distracting. To implement the delay behavior, we’ll use the setTimeout and clearTimeout functions. Let’s start by defining a variable to keep track of the timeout. 
let timeout = null
Next, let’s update the start event listener to start a new timeout that will show the progress bar after 250 milliseconds. 
router.on('start', () => {
timeout = setTimeout(() => NProgress.start(), 250)
})
Next, we’ll update the finish event listener to clear any existing timeouts in the event that the page visit finishes before the timeout does. 
router.on('finish', (event) => {
clearTimeout(timeout)
// ...
})
In the finish event listener, we need to determine if the progress bar has actually started displaying progress, otherwise we’ll inadvertently cause it to show before the timeout has finished. 
router.on('finish', (event) => {
clearTimeout(timeout)
if (!NProgress.isStarted()) {
return
}
// ...
})
And, finally, we need to do the same check in the progress event listener. 
router.on('progress', event => {
if (!NProgress.isStarted()) {
return
}
// ...
}
That’s it, you now have a beautiful custom page loading indicator!

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Complete Example

For convenience, here is the full source code of the final version of our custom loading indicator. 
import NProgress from 'nprogress'
import { router } from '@inertiajs/vue2'

let timeout = null

router.on('start', () => {
    timeout = setTimeout(() => NProgress.start(), 250)
})

router.on('progress', (event) => {
    if (NProgress.isStarted() && event.detail.progress.percentage) {
        NProgress.set((event.detail.progress.percentage / 100) * 0.9)
    }
})

router.on('finish', (event) => {
    clearTimeout(timeout)
    if (!NProgress.isStarted()) {
        return
    } else if (event.detail.visit.completed) {
        NProgress.done()
    } else if (event.detail.visit.interrupted) {
        NProgress.set(0)
    } else if (event.detail.visit.cancelled) {
        NProgress.done()
        NProgress.remove()
    }
})