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How to Build a Nuxt.js Image Viewer with PSPDFKit

Illustration: How to Build a Nuxt.js Image Viewer with PSPDFKit

In this post, we provide you with a step-by-step guide outlining how to deploy PSPDFKit’s Nuxt.js image viewer.

Nuxt.js is a framework built on top of Vue.js that offers server-side rendering for Vue applications. This allows the creation of universal Vue applications, where the HTML content is generated on the server and served to the client. This affects SEO optimization positively and can speed up your page.

It also supports automatic routing with zero configuration for every page and simplifies the development of Vue.js applications.

What Is a Nuxt.js Image Viewer?

A Nuxt.js image viewer lets you render and view image documents in a web browser without the need to download it to your hard drive or use an external application like an image reader.

PSPDFKit Nuxt.js Image Viewer

We offer a commercial Nuxt.js image viewer library that can easily be integrated into your web application. It comes with 30+ features that let you view, annotate, edit, and sign documents directly in your browser. Out of the box, it has a polished and flexible UI that you can extend or simplify based on your unique use case.

  • A prebuilt and polished UI
  • 15+ annotation tools
  • Support for multiple file types
  • Dedicated support from engineers

Example of Our Nuxt.js Image Viewer

To see our image viewer in action, upload a JPG, PNG, or TIFF file by selecting Choose Example > Open Document (if you don’t see this, switch to the Standalone option). Once your image is displayed in the viewer, you can try drawing freehand, adding a note, or applying a crop or an e-signature.

Requirements to Get Started

To get started, you’ll need:

  • Node.js (this post uses version 16.13.0)
  • A package manager for installing packages — you can use npm or Yarn

Creating the Project

Now you’ll see how to integrate PSPDFKit into your Nuxt.js project. Open a terminal and navigate to the place where you want to create the project.

  1. Create a new Nuxt.js project with create-nuxt-app:

npx create-nuxt-app pspdfkit-nuxtjs-project

Here, you’re using the create-nuxt-app option with the name of the project you want to create (pspdfkit-nuxtjs-project).

  1. This will ask you some questions. Choose the default options by pressing Enter. Once you answer all the questions, it’ll install the dependencies and create a new Nuxt.js project.

Nuxt.js project creation

  1. Now, change your directory to pspdfkit-nuxtjs-project:

cd pspdfkit-nuxtjs-project

Adding PSPDFKit

  1. Install pspdfkit as a dependency with npm:

npm install pspdfkit
  1. Copy the PSPDFKit for Web library assets to the static directory:

cp -R ./node_modules/pspdfkit/dist/pspdfkit-lib static/pspdfkit-lib

This will copy the pspdfkit-lib directory from within node_modules/ into the static/ directory to make it available to the SDK at runtime.

Displaying an Image Document

  1. Add the image you want to display to the static directory. You can use our demo image as an example.

  2. Add a component wrapper for the PSPDFKit library and save it as components/PSPDFKitContainer.vue:

// components/PSPDFKitContainer.vue

<template>
	<div class="image-container"></div>
</template>

<script>
/**
 * PSPDFKit for Web example component.
 */
export default {
	name: 'PSPDFKit',
	/**
	 * The component receives `pdfFile` as a prop, which is type of `String` and is required.
	 */
	props: {
		imageFile: {
			type: String,
			required: true,
		},
	},
	PSPDFKit: null,
	/**
	 * Wait until the template has been rendered to load the document into the library.
	 */
	mounted() {
		this.loadPSPDFKit().then((instance) => {
			this.$emit('loaded', instance);
		});
	},
	/**
	 * Watch for `imageFile` prop changes and trigger unloading and loading when there's a new document to load.
	 */
	watch: {
		imageFile(val) {
			if (val) {
				this.loadPSPDFKit();
			}
		},
	},
	/**
	 * Our component has the `loadPSPDFKit` method. This unloads and cleans up the component and triggers document loading.
	 */
	methods: {
		async loadPSPDFKit() {
			import('pspdfkit')
				.then((PSPDFKit) => {
					this.PSPDFKit = PSPDFKit;
					PSPDFKit.unload('.image-container');

					return PSPDFKit.load({
						document: this.imageFile,
						container: '.image-container',
						baseUrl: 'http://localhost:3000/',
					});
				})
				.catch((error) => {
					console.error(error);
				});
		},
	},
};
</script>

<style scoped>
.image-container {
	height: 100vh;
}
</style>

Here’s what’s happening in the component:

  • The template section is rendering a div with the image-container class. This will help you declaratively bind the rendered DOM to the underlying component instance’s data.

  • The script section is defining a Nuxt.js instance named PSPDFKit and creating methods for mounting and loading PDF files into the image-container.

  • The style section is defining the height of the container.

  1. Include the newly created component in pages/index.vue:

// pages/index.vue

<template>
	<div id="app">
		<label for="image-upload" class="custom-image-upload">
			Open Image
		</label>
		<input
			id="image-upload"
			type="file"
			@change="openDocument"
			class="btn"
		/>
		<PSPDFKitContainer
			:imageFile="imageFile"
			@loaded="handleLoaded"
		/>
	</div>
</template>

<script>
import PSPDFKitContainer from '../components/PSPDFKitContainer.vue';

export default {
	name: 'app',
	/**
	 * Render the `PSPDFKitContainer` component.
	 */
	components: {
		PSPDFKitContainer,
	},

	data() {
		return {
			imageFile: this.imageFile || '/image.png',
		};
	},

	/**
	 * The component has two methods — one to check when the document is loaded, and the other to open the document.
	 */
	methods: {
		handleLoaded(instance) {
			console.log('PSPDFKit has loaded: ', instance);
			// Do something.
		},

		openDocument(event) {
			if (this.imageFile && this.imageFile.startsWith('blob:')) {
				window.URL.revokeObjectURL(this.imageFile);
			}
			this.imageFile = window.URL.createObjectURL(
				event.target.files[0],
			);
		},
	},
};
</script>

<style>
#app {
	font-family: Avenir, Helvetica, Arial, sans-serif;
	text-align: center;
	color: #2c3e50;
}

body {
	margin: 0;
}

input[type='file'] {
	display: none;
}

.custom-image-upload {
	border: 1px solid #ccc;
	border-radius: 4px;
	display: inline-block;
	padding: 6px 12px;
	cursor: pointer;
	background: #4a8fed;
	padding: 10px;
	color: #fff;
	font: inherit;
	font-size: 16px;
	font-weight: bold;
}
</style>
  • In the template section, you have a file upload input and the PSPDFKitContainer component.

Similar to the input field, for the PSPDFKitContainer component, you’re using the v-bind directive to bind the imageFile property to the imageFile property of the component and attaching an event listener for the loaded event:

<PSPDFKitContainer :imageFile="imageFile" @loaded="handleLoaded" />
  • In the script section, you can see the implementation of the handleLoaded and openDocument methods. Also, there’s a data function that returns the imageFile property.

  • In the style section, there are styles for custom file input and general styles for the app.

  1. Start the app:

npm run dev

You can see the application running on http://localhost:3000.

In the demo application, you can open different image files by clicking the Open Image button. You can add signatures, annotations, stamps, and more.

Information

You can find the example on GitHub.

Adding Even More Capabilities

Once you’ve deployed your viewer, you can start customizing it to meet your specific requirements or easily add more capabilities. To help you get started, here are some of our most popular Nuxt.js guides:

Conclusion

You should now have our Nuxt.js image viewer up and running in your web application. If you hit any snags, don’t hesitate to reach out to our support team for help.

You can also integrate our JavaScript image viewer using web frameworks like Angular and React.js. To see a list of all web frameworks, start your free trial. Or, launch our demo to see our viewer in action.

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