#offline browsing

Downloading an entire website can be incredibly useful for various purposes, from creating local backups to analysing website structure offline. The wget command-line tool offers a powerful and flexible solution for downloading complete websites with just a few simple commands. Whether you’re a developer, content creator, or digital archivist, understanding how to download an entire website using…

Teleport Ultra 1.72

New Download : Teleport Ultra 1.72

Teleport Ultra 1.72 Teleport Pro’s big brother, Teleport Ultra, has Pro’s intuitive interface and easy-to-use project-based design – but it also has the ability to scan up to 260,000 addresses in a single project. Like Teleport Pro, Teleport Ultra can handle multiple servers...

Teleport Pro 1.72

New Download : Teleport Pro 1.72

Teleport Pro 1.72 PC Magazine’s Editors’ Choice for offline browsers, Teleport Pro is an all-purpose high-speed tool for getting data from the Internet. Launch up to ten simultaneous retrieval threads, access password-protected sites, filter files by size and type, search for...

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Gear is providing the way to save data within user disk, let’s see Database part of google gear

The DataBase allow to store user’s data on the user’s computer. For security gear allows to access data related to particular domain. Gear is providing two classes to do database related functionality, Database and Resultset. 

First you have to create Database object using gear factory. var database = google.gears.factory.create('beta.database', '1.0'); // open the database database.open('localApprDB'); // execute the sql database.execute('create table if not exists users (name varchar(100), user_req varchar(100), status varchar(100), last_modified_date datetime)');

The execute() method use bind parameters (?) to prevent SQL injection attacks and improve performance. SQLite database supports almost all the database functionality. Let’s try some simple insert-fetch with created users table.

database.execute("insert into users values (?, ? , ?, date('now'))", ['vicky', 'request for new laptop.', 'Active']);

The data declared in array will replaced with question marks(?). It’s good practice to bind variable, It will automatically escaped by the SQL engine. Gear adds rowid column to every table it’s unique integer id for every row of your table. After every successful insertion gear update lastInsertRowId readonly attribute of Database Object.

// database.execute() returns Resultset object. It has the results of executing the SQL. resultset = database.execute(select user_req from  users where name=? and status=?",['vicky', 'Active']);

Resultset is providing methods to Iterate over rows like isValidRow(), next(), and close(), And to access columns you have field(), fieldName() and fieldByName() methods.

while (rs.isValidRow()) { console.log(rs.fieldName(0) + " == " + rs.field(0)); rs.next(); } rs.close();

Output :- name == vicky

The fieldName() and field() takes int index of column, and fieldByName() takes name of the desired field like rs.fieldByName('user_req').

That’s all about database, it’s for storing data on the local machine same way we handle database in any other language.

As per google definition “Gears is an open source browser extension that lets developers create web applications that can run offline.” Gears provides three key features:

LocalServer :- To cache and serve web application’s static resource ( HTML, images, JavaScript ) in offline mode mean serve the resource without internet connection.

Database :- To store and access local relational database from within the browser with using JavaScript API. To fulfill this gear is using open source SQLite database, It support almost all the database functionality like trigger, view, multiple tables etc…

WorkerPool (worker thread pool):- The API allows web applications to run heavy and expensive JavaScript operations in the background asynchronously, without blocking the main page’s script execution. How To Use It?

First thing you have to initialize gears_init.js script in your HTML file. If gear installed than you will get google.gears object, else you can direct user to customized install/upgrade page. You can specify personalise message, and return parameter for after installing redirecting our website url, Other parameters are icon_src, name.

<script src="gears_init.js"></script> <script> if (!window.google || !google.gears) { location.href = "http://gears.google.com/?action=&message=<your welcome message>" + "&return=<your website url>"; } </script>

To initialize any gear object you have to use google.gears.factory.create() method which takes two parameters. var obj = google.gears.factory.create('<classname>', '<version>');

That’s all about gear’s core methods,All other things comes under LocalServer, Database and WorkerPool.

Here's an easy enough LazyWeb request.

An offline browser for the iPad. A proper good one.

Here's what I want:

You open it up and there's a browser. Pretty much like the standard Safari.

When you bookmark something, you save it offline.

Some kind of 'Readability' type option. Type on Wikipedia is a bit too small to read on the iPad for me.

It keeps the stuff persistent. Basically, once the page is downloaded, it keeps it until you delete it. It's not like an Instapaper type thing where you archive it once you are done or whatever.

There's a big button to update all. When you are connected you hit that, and it redownloads all the pages. And it only discards the existing copy if it gets 200 OK and downloads properly.

The list of these saved pages is manageable, exportable, importable and maybe even syncable. Plenty of iPad apps are doing Dropbox sync now. That sounds like a good idea. Basically, it's pretty simple: you have a nice simple format like YAML or Notation3 or something like that. And you stick it in Dropbox (or you can e-mail it out or whatever, or maybe have a web service, but that's getting a bit too much like Instapaper).

It's not annoying.

Wanna do something really cool? Do HTTP properly. Last-Modified dates. Content-Length. Content-MD5 (as per RFC 2616 section 14.15 and RFC 1864) or Content-SHA1 (as per, you know, a sane world where MD5 has been deprecated in favour of SHA1).

I'm using a free app from the App Store that does some of that. Basically, I have stopped topping up my 3G as much, and it's nice to be able to be able to have another place to dump web content I might want to read.

What makes this different from Instapaper? Well, the point for me about Instapaper is that it's just like a newspaper or magazine: you download a bunch of articles you want to read into it, then you read them. It's like an inbox for content. The use case for an offline browser is simpler. Say you are editing Wikipedia. You put articles you are interested in keeping an eye on in the offline browser. You refresh, see which pages have updated. You've got access to up-to-date reference material on the move. There are plenty of other uses.