DataExtracter Help

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DataExtracter helps you quickly extract data from any web pages.

All you need to do is:

• Find out the selectors for target data
• Type scripts in the console of extension backgroud page, as introduced bellow.

Qucik Start

Extract current page

$('.item', ['a', 'a@href']);

Extract multiple pages (1-10, interval 1)

$('.item', ['a', 'a@href'],"http://sample.com/?pn=${page}", 1, 10, 1);

Extract multiple urls (list)

$('.item', ['a', 'a@href'],["http://sample.com/abc","http://sample.com/xyz"]);

Extract specified pages (1,3,5)

$('.item', ['a', 'a@href'], "http://sample.com/?pn=${page}", [1, 3, 5]);

Task Call Signitures

// extract data from current page
function (itemsSelector:string, fieldSelectors:string[])
// extract data from a range of pages
function (itemsSelector:string, fieldSelectors:string[], urlTemplate:string, from:number, to:number, interval:number)
// extract data from a list of pages
function (itemsSelector:string, fieldSelectors:string, urlTemplate:string, pages:number[])
// extract data from a list of pages
function (itemsSelector:string, fieldSelectors:string[], urls:string[])
// extract data of urls which extracted from last task result
function (itemsSelector:string, fieldSelectors:string[], urls:ExtractResult)

Stop Tasks

The only way to stop tasks before its finish, is Closing the target tab.

Tasks wait for their target elements' appearance, given some elements were loaded asynchronously.
If you typed wrong selectors, the task waits forever for elements which don't exists.

Extract Attributes.

e.g.: link text and target (use 'selector@attribute')

new Extractor().task('.item', ['a', 'a@href']).start();

Advanced Usage

Use Task Chain.

e.g.: Collect links from http://sample.com/abc, then, Extract data of each link

e = new Extractor()
e.task('.search-list-item', ['a@href'], ["http://sample.com/abc"])
    .task('list-item', ["a.title", "p.content"])
    .start();

Continue Tasks

You can always continue tasks (with following), even it stops in the middle of a task:

e.start()

The Extractor kept the state of last execution, and starts from where it stopped.

Restart Tasks

What should I do, if I don't like to continue from last state, but restart from certain task?

// restart all tasks
e.restart(0)
// restart from 2nd task
e.restart(1)

Save Result of Any Task

To a multiple task Extractor e:

e = new Extractor()
e.task('.search-list-item', ['a@href'], ["http://sample.com/abc"])
    .task('list-item', ["a.title", "p.content"])
    .start();

User will be asked to save the final result when it finishes.

Incase you want to save it again, use:

e.save()

To save another task result, other than the final one:

// save the result of first task
// to the example above, that is a list of urls
e.save(0)
// save the result of second task
e.save(1)