Google Books Api Categories



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  1. Google Books Api Categories
  2. Google Books Api Search By Categories

Integrate with the Google Books repository

Google Books is our effort to make book content more discoverable on the Web. Using the Google Books API, your application can perform full-text searches and retrieve book information, viewability and eBook availability. You can also manage your personal bookshelves.

Embed book previews on your site

The Embedded Viewer API lets you embed Google Books previews on your own website and programmatically control these previews.

Case studies

See how the Google Books APIs are being used by WorldCat, GoodReads, the University of California Libraries, and more.

The Embedded Viewer API lets you embed book content fromGoogle Books directly in your web pages with JavaScript. The API also provides a number of utilities for manipulating book previews, and is often used together with the other APIs described on this site.

The Preview Wizard is a tool built atop the Embedded Viewer API that makes it easier to add preview capabilities to your site by just copying a couple lines of code. This document is intended for more advanced developers looking to customize how the viewer appears on their sites.

Google Books Api Categories

Audience

This documentation is designed for people familiar withJavaScriptprogramming and object-oriented programming concepts. You should also be familiar withGoogle Books from a user's point of view. There aremany JavaScript tutorialsavailable on the Web.

This conceptual documentation is not complete and exhaustive; it is designed to let you quickly start exploring and developing cool applications with the Embedded Viewer API. Advanced users should may be interested in theEmbedded Viewer API Reference, which provides comprehensive detailson supported methods and responses.

As indicated above, beginners may want to start with the Preview Wizard, which automatically generates the code necessary to embed basic previews on your site.

The 'Hello, World' of the Embedded Viewer API

Listen by beyonce mp3 download. The easiest way to start learning about the Embedded Viewer API is to see a simple example.The following web page displays a 600x500 preview ofMountain View, by NicholasPerry, ISBN 0738531367 (part of Arcadia Publishing's 'Images of America' series):

You can look at this example and download it to edit and playaround with it. Even in this simple example, there are five things to note:

  1. We include the API Loader using a script tag.
  2. We create a div element named 'viewerCanvas' to hold the viewer.
  3. We write a JavaScript function to create a 'viewer' object.
  4. We load the book using its unique identifier (in this case ISBN:0738531367).
  5. We use google.books.setOnLoadCallback to call initialize when the API has fully loaded.

These steps are explained below.

Loading the Embedded Viewer API

Using the API Loader framework to load the Embedded Viewer API is relatively simple.It involves the following two steps:

  1. Include the API Loader library:
  2. Invoke the google.books.load method. The google.books.load method takes an optional list parameter specifying a callback function or language, as explained below.

Loading a localized version of the Embedded Viewer API

Google Books Api Search By Categories

The Embedded Viewer API uses English by default when displaying textual information such astooltips, the names for controls, and link text. If you wish to changethe Embedded Viewer API to properly display information in a particular language, you can add an optionallanguage parameter to your google.books.load call.

For example, to display a book preview module with the Brazilian Portuguese interface language:

Currently supported RFC 3066 language codes include af, ar, hy, bg, ca, zh-CN, zh-TW, hr, cs, da, nl, en, fil, fi, fr, de, el, he, hu, is, id, it, ja, ko, lv, lt, ms, no, pl, pt-BR, pt-PT, ro, ru, sr, sk, sl, es, sv, tl, th, tr, uk, and vi.

When using the Embedded Viewer API in languages other than English, we strongly recommend serving your page with a content-type header set to utf-8, or including an equivalent <meta> tag in your page. Doing this helps ensure that characters render correctly across all browsers. For more information, see the W3C's page on setting the HTTP charset parameter.

Viewer DOM elements

For a book to display on a web page, one must reserve a spot for it. Commonly, this is doneby creating a named div element and obtaining a reference tothis element in the browser's document object model (DOM).

The example above defines a div named 'viewerCanvas' and sets its sizeusing style attributes. The viewer implicitly uses the size of the container to size itself.

The DefaultViewer object

The JavaScript class that creates and controls a single viewer on the page isthe DefaultViewer class. (You may create more than one instance of this class - eachobject will define a separate viewer on the page.) A new instance of this class is createdusing the JavaScript new operator.

When you create a new viewer instance, you specify a DOM node in thepage (usually a div element) as a container for the viewer. HTML nodesare children of the JavaScript document object, andwe obtain a reference to this element via the document.getElementById() method.

This code defines a variable (named viewer) and assigns that variable to a newDefaultViewer object. The function DefaultViewer() is known as a constructorand its definition (condensed for clarity from the Embedded Viewer API Reference) is shown below:

ConstructorDescription
DefaultViewer(container, opts?)Creates a new viewer inside the given HTML container, which should be a block-level element on the page (typically aDIV). Advanced options are passed using the optional opts parameter.

Note that the second parameter in the constructor is optional—intended for advanced implementations beyond the scope of this document—and it is omitted from the 'Hello, World' example.

Initializing the viewer with a specific book

Once we've created a viewer via the DefaultViewer constructor, it needs to be initializes with a particular book. This initializationis accomplished with use of the viewer's load() method. The load() method requires anidentifier value, which tells the API what book to show. This method must be sent before any other operations are performedon the viewer object.

If you know of multiple identifiers for a book—the ISBN for the paperback edition, or alternate OCLC numbers—you can pass an array of identifier strings as the first parameter to the load() function. The viewer will render the book if there is an embeddable preview associated with any of identifiers in the array.

Supported book identifiers

Like the Dynamic Links feature, the Embedded Viewer API supports a number of values to identify a particular book. These include:

ISBN
The unique 10- or 13-digit commercial International Standard Book Number.
Example: ISBN:0738531367
OCLC number
The unique number assigned to a book by the OCLC when the book's record is added to the WorldCat cataloging system.
Example: OCLC:70850767
LCCN
The Library of Congress Control Number assigned to the record by the Library of Congress.
Example: LCCN:2006921508
Google Books volume ID
The unique string Google Books has assigned to the volume, which appears in the URL to the book on Google Books.
Example: Py8u3Obs4f4C
Google Books preview URL
A URL that opens a book preview page on Google Books.
Example: https://books.google.com/books?id=Py8u3Obs4f4C&printsec=frontcover

These identifiers are often used with other APIs in the Google Books API Family. For example, you can use Dynamic Links to render a preview button only if the book is embeddable—and then, when the user clicks the button, instantiate a viewer using the preview URL returned by the Dynamic Links call. Similarly, you can build a rich browse-and-preview application with the Books API, which returns several suitable industry identifiers in its Volumes feeds. Visit the examples page to peek at some advanced implementations.

Handling failed initializations

In some cases, the load call may fail. Typically this occurs when the API could not find a book associated with the supplied identifier, when there is no preview of the book available, when the book preview cannot be embedded, or when territorial restrictions prevent the end user from seeing this particular book. You may wish to be alerted of such a failure, so your code can handle this condition gracefully. For this reason, the load function allows you to pass an optional second parameter, notFoundCallback, which indicates what function should be called if the book could not be loaded. For example, the following code will generate a JavaScript 'alert' box if the book could be embedded:

Using this callback, you may decide to show a similar error, or you may choose to hide the viewerCanvas element completely. The failure callback parameter is optional, and is not included in the 'Hello World' example.

Note: Because previews may not be available for all books and for all users, it may be useful to know whether a preview is available before you even try to load a viewer for it. For example, you may want to show a 'Google Preview' button, page, or section in your UI only if a preview will actually be available to the user. You can do this using the Books API or Dynamic Links, both of which report whether a book will be available for embedding using the viewer.

Handling successful initializations

It may also be useful to know if and when a book has loaded successfully. For this reason, the load function supports an optional third parameter, successCallback, which will be executed if and when a book has finished loading.

This callback may be useful if, for example, you only want to show certain elements on your page if the viewer has fully rendered.

Showing the viewer on load

While an HTML page renders, the document object model (DOM) is built out, and any external images and scripts are receivedand incorporated into the document object. To ensure that our viewer is only placed on the page after the page hasfully loaded, the google.books.setOnLoadCallback function is used to defer execution of the function that constructs the DefaultViewer object. Since setOnLoadCallback will only call initialize when the Embedded Viewer API is loaded and ready to be used, this avoids unpredictable behavior and ensures control of how and when the viewer is drawn.

Note: To maximize cross-browser compatibility, it is strongly recommended that you schedule the viewer load using google.books.setOnLoadCallback function, rather than using a onLoad event on your <body> tag.

Viewer interactions

Now that you have a DefaultViewer object, you can interact with it. The basic viewer object looks and behaves a lotlike the viewer you interact with on the Google Books website and comes with a lot of built-in behavior.

But you can also interact with the viewer programmatically. The DefaultViewerobject supports a number of methods that alter the preview state directly. For example, the zoomIn(), nextPage(),and highlight() methods operate on the viewer programmatically, rather than through user interaction.

The following example displays a book preview that automatically 'turns' to the next page every 3 seconds. If the next page is in thevisible part of the viewer, then the viewer pans smoothly to the page; if not, the viewer jumps directly to the top of the next page.

Note that programmatic calls to the viewer will fail or have no effect until the viewer is fully initialized with a particular book. To ensure you only call such functions when the viewer is ready, use the successCallback parameter to viewer.load as described above.

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For information on all the functions supported by the DefaultViewer object, see the Reference Guide.

Google books api example

Programming notes

Before you start delving into the Embedded Viewer API, you should take note ofthe following concerns to ensure your application works smoothly acrossits intended platforms.

Browser compatibility

The Embedded Viewer API supports recent versions of Internet Explorer,Firefox, and Safari—and usually other Gecko- and WebKit-based browsers such asCamino andGoogle Chrome as well.

Different applications sometimes require different behaviors for users with incompatible browsers.The Embedded Viewer API does not have any automatic behavior when it detects an incompatible browser. Most of theexamples in this document do not check for Browser compatibility, nor do theydisplay an error message for older browsers. Real applications may do somethingmore friendly with old or incompatible browsers, but such checks are omitted to make theexamples more readable.

Non-trivial applications will inevitably encounter inconsistencies between browsers andplatforms. Sites such as quirksmode.org, arealso good resources to find workarounds.

XHTML and quirks mode

We recommend that you use standards-compliant XHTML on pages that contain the viewer. When browsers see the XHTMLDOCTYPE at the top of the page, they render the page in 'standards compliance mode,' which makeslayout and behaviors much more predictable across browsers. Pages without that definition may render in'quirks mode,' which can lead to inconsistent layout.

A note on the Embedded Viewer API examples

Note that most of the examples in this documentation show only relevant JavaScript code, not the fullHTML file. You can plug the JavaScript code into your own skeleton HTML file, or you candownload the full HTML file for each example by clicking the link after the example.

Troubleshooting

If your code doesn't seem to be working, here are some approachesthat might help you solve your problems:

  • Look for typos. Remember that JavaScript is a case-sensitive language.
  • Use a JavaScript debugger. In Firefox, you can use the JavaScript console, the Venkman Debugger, or the Firebug add-on. In IE, you can use the Microsoft Script Debugger. The Google Chrome browser comes with a number of development tools built right in, including a DOM inspector and a Javascript debugger.