NAME

Weasel::DriverRole - API definition for driver wrappers

VERSION

0.01

SYNOPSIS

use Moose;
use Weasel::DriverRole;

with 'Weasel::DriverRole';

...  # (re)implement the functions in Weasel::DriverRole

DESCRIPTION

This module defines the API for all Weasel drivers to be implemented.

By using this role in the driver implementation module, an abstract method is implmented croak()ing if it's called.

ATTRIBUTES

started

Every session is associated with a driver instance. The started attribute holds a boolean value indicating whether or not the driver is ready to receive driver commands.

The value managed by the start and stop methods.

METHODS

implements

This method returns the version number of the API which it fully implements.

Weasel::Session may carp (warn) the user about mismatching API levels in case a driver is coded against an earlier version than $Weasel::DriverRole::VERSION.

start

This method allows setup of the driver. It is invoked before any web driver methods as per the Web driver methods section below.

stop

This method allows tear-down of the driver. After tear-down, the start method may be called again, so the this function should leave the driver in a restartable state.

restart

This function stops (if started) and starts the driver.

Web driver methods

Terms

element_id / parent_id

These are opaque values used by the driver to identify DOM elements.

Note: The driver should always accept an xpath locator as an id value as well as id values returned from earlier driver calls

API

find_all( $parent_id, $locator, $scheme )

Returns the _id values for the elements to be instanciated, matching the $locator using scheme.

Depending on array or scalar context, the return value is a list or an arrayref.

Note: there's no function to find a single element. That function is implemented on the Weasel::Session level.

get( $url )

Loads the page at $url into the driver's browser (browser emulator).

The $url passed in has been expanded by Weasel::Session, prepending a registered prefix.

is_displayed($element_id)

Returns a boolean value indicating whether the element indicated by $element_id is interactable (can be selected, clicked on, etc)

wait_for( $callback, retry_timeout => $num, poll_delay => $num )

The driver may interpret the 'poll_delay' in one of two ways: 1. The 'poll_delay' equals the number of seconds between the start of successive poll requests 2. The 'poll_delay' equals the number of seconds to wait between the end of one poll request and the start of the next

Note: The user should catch inside the callback any exceptions that are thrown inside the callback, unless such exceptions are allowed to terminate further polling attempts. I.e. this function doesn't guard against early termination by catching exceptions.

clear($element_id)

Clicks on an element if an element id is provided, or on the current mouse location otherwise.

click( [ $element_id ] )

Clicks on an element if an element id is provided, or on the current mouse location otherwise.

dblclick()

Double clicks on the current mouse location.

get_attribute($element_id, $attribute_name)

Returns the value of the attribute named by $attribute_name of the element indicated by $element_id.

get_text($element_id)

Returns the HTML content of the element identified by $element_id, the so-called 'innerHTML'.

set_attribute($element_id, $attribute_name, $value)

Changes the value of the attribute named by $attribute_name to $value for the element identified by $element_id.

get_selected($element_id)

set_selected($element_id, $value)

screenshot($fh)

Takes a screenshot and writes the image to the file handle $fh.

Note: In the current version of the driver, it's assumed the driver writes a PNG image. Later versions may add APIs to get/set the type of image generated.

send_keys($element_id, @keys)

Simulates key input into the element identified by $element_id.

@keys is an array of (groups of) inputs; multiple multi-character strings may be listed. In such cases the input will be appended. E.g.

$driver->send_keys($element_id, "hello", ' ', "world");

is valid input to enter the text "hello world" into $element_id.

tag_name($element_id)

The name of the HTML tag identified by $element_id.

SEE ALSO

Weasel

COPYRIGHT

(C) 2016  Erik Huelsmann

Licensed under the same terms as Perl.