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Using the HTML5 Filesystem API 1st Edition

3 out of 5 stars 3 customer reviews
ISBN-13: 978-1449309459
ISBN-10: 1449309453
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Book Description

A True Filesystem for the Browser

About the Author

Eric is a Senior Developer Programs Engineer on the Google Chrome team, and one of the core contributors to html5rocks.com. His mission is to spread HTML5 goodness by educating developers, worldwide. Eric previously worked on the Google Docs, Sites, Health, and OAuth APIs. Prior to Google, Eric worked as a software engineer at the University of Michigan where he designed rich web applications and APIs for the university's 19 libraries. Eric holds a B.S.E in Computer Engineering and a B.S.E in Electrical Engineering from the University of Michigan, Ann Arbor. He can be found on Twitter at @ebidel.

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Product Details

  • Paperback: 76 pages
  • Publisher: O'Reilly Media; 1 edition (August 5, 2011)
  • Language: English
  • ISBN-10: 1449309453
  • ISBN-13: 978-1449309459
  • Product Dimensions: 7 x 0.2 x 9.2 inches
  • Shipping Weight: 5.6 ounces (View shipping rates and policies)
  • Average Customer Review: 3.0 out of 5 stars  See all reviews (3 customer reviews)
  • Amazon Best Sellers Rank: #3,263,291 in Books (See Top 100 in Books)

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By Abhinav Agarwal VINE VOICE on August 23, 2011
Format: Paperback
This is a short introduction to the HTML5 Filesystem API, but with an emphasis on the Google Chrome implementation. The author states that at the time of writing this book, only the Chrome browser implemented the API. Furthermore, the HTML5 spec itself is evolving, and is subject to change ("Take my word of caution and realize that until the spec is final, portions of the API could change." - pg 3). An ample number of code examples makes this a good read however. Even if you are not going to be doing programming where this information would be useful (as is the case with me), this is a short book that still provides you with a quick reckoner of what the API provides.

The topics covered in this short 58 page book are:
Storage and quota, including temporary, persistent, and unlimited storage.
"
Local disk usage and IO bandwidth--this is mitigated in part through quota limitations.
Leakage or erasure of private data--this is mitigated by limiting the scope of the HTML5 filesystem to a chroot-like, origin-specific sandbox.
Storing malicious executables or illegal data on a user's system--with any download there is a risk. The API mitigates against malicious executables by restricting file creation/rename to nonexecutable extensions...
"

Working with files and directories using the API, including what a file entry looks like, how to import, read, remove, create and append data to files. On the topic of directories, subdirectories and recursively removing a directory is also covered.
You can use the html input tag to import files - single or multiple: or or .
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Format: Paperback
The HTML5 FileSystem API will give web applications desktop-like capabilities such as the ability to create a hierarchy of file folders and save binary or textual contents to them, locally within a user's hard drive. This API can be used in addition to or in lieu of other proposed local storage mechanisms such as those oriented around the use of a database.

This book's discussion of the HTML5 FileSystem API is limited to Google's implementation of the API for its WebKit-based Chrome browser, the first available full-featured implementation of the yet to be standardized API.

The author does not waste time with a lot of preambles nor try to pad the text to make it a bit bulkier. For example, the implemented API methods have both asynchronous and synchronous versions. The author covers the asynchronous versions first, then when he gets to the synchronous versions, rather than revisiting similar material, he merely points out the important differences between the two types of versions, and in the provided code examples, only shows what needs to be handled differently when using one or the other version type.

The book reads like a reference, with separate chapters for file- versus directory-oriented functionalities. Methods are enumerated, and for each, the semantics of the method signature is explained, and a basic illustrative code example showing how to use the method is provided.

Although it only covers Google's early implementation of the proposed API, and for the most part, only provides basic usage examples, this book should still prove useful for those anxious to start getting a feel for the API.
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His code does not work. There is no HTML framework shown for his code. I contacted him and he refuses to send me working code.
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