---
title: BookReader
created: 2016-11-07 16:06
updated: 2016-11-07 16:10
revision: 2
author: Auriea
summary: "==Serving Images== In the case of the Standalone Demo, operation is fairly simple. Images are numbered sequentially and stored in a directory . . ."
---

## Serving Images

In the case of the Standalone Demo, operation is fairly simple. Images are numbered sequentially and stored in a directory called "StandAloneImages". The images are all the same size, and two functions in BookReaderJSSimple.js, getPageWidth() and getPageHeight(), return the page size. Scaling is done in the web browser.

## Extending bookreader functionality

To make is it easier to work with other sources, the bookreader can expect a book interface from the client with the following methods.

<code>
getPageCount()
getPage(index)
getPageWidth(index)
getPageHeight(index)</code>
The book reader can have optional functionality which is enabled only when the book implementation has a specific method defined.
For example, bookmarks functionality can be enabled only when the book interface has getBookmarks method defined.
<code>
getBookmarks(index)</code>
Typical usage:
<code>
<script src="/js/bookreader.js" type="text/javascript"/>
<script src="/js/archivebook.js" type="text/javascript"/>
<div id="book1"></div>
<script>
    document.onload = function() {
        var b = bookreader("book1", ArchiveBook("tomsawyer"));
       b.showPage(42);
    }
</script></code>