To allow users to change the page being rendered, we must now add click event listeners to the goprevious and gonext buttons we created earlier.

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Although most modern browsers can display PDF files, they do so using a PDF viewer that runs in an independent tab or window, forcing users to leave your website.

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In this tutorial, Ill show you how to use it to create a fully fledged custom JavaScript PDF viewer from scratch.

JavaScript flipbooks showcase your content in a digital flipbook form, using page-flipping effects, zoom, and support for multiple content types.

We will, however, allow users to switch to the previous page or the next page by pressing a button.

Additionally, to display the current page number, and to allow users to jump to any page they desire, our interface will have an input field.

Inside it, well have three items: a reference to the PDF file itself, the current page index, and the current zoom level.

This means that the file must be present either on your own web server or on a server that allows cross-origin requests.

For now, lets pass the currentPage property of our state object to it.

This method too returns a promise, so well need a callback function to handle its result.

As arguments, the method expects the 2D context of our canvas and a PageViewport object, which we can get by calling the getViewport() method.

Because the getViewport() method expects the desired zoom level as an argument, we must pass the zoom property of our state object to it.

In order to make sure that the entire viewport is rendered on our canvas, we must now change the size of our canvas to match that of the viewport.

This is not ideal because we dont want the layout of our web page to be affected while users interact with the PDF viewer.

This property, when necessary, adds scroll bars to the element, allowing users to scroll both horizontally and vertically.

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