Simulate a session in web browser

This set of functions allows you to simulate a user interacting with a website, using forms and navigating from page to page.

• Create a session with session(url)

• Navigate to a specified url with session_jump_to(), or follow a link on the page with session_follow_link().

• Submit an html_form with session_submit().

• View the history with session_history() and navigate back and forward with session_back() and session_forward().

• Extract page contents with html_element() and html_elements(), or get the complete HTML document with read_html().

• Inspect the HTTP response with httr::cookies(), httr::headers(), and httr::status_code().

Usage

session(url, ...)

is.session(x)

session_jump_to(x, url, ...)

session_follow_link(x, i, css, xpath, ...)

session_back(x)

session_forward(x)

session_history(x)

session_submit(x, form, submit = NULL, ...)

Arguments

url

A URL, either relative or absolute, to navigate to.

...

Any additional httr config to use throughout the session.

x

A session.

i

A integer to select the ith link or a string to match the first link containing that text (case sensitive).

css, xpath

Elements to select. Supply one of css or xpath depending on whether you want to use a CSS selector or XPath 1.0 expression.

form

An html_form to submit

submit

Which button should be used to submit the form?

• NULL, the default, uses the first button.

• A string selects a button by its name.

• A number selects a button using its relative position.

Examples

s <- session("http://hadley.nz")
s |>
  session_jump_to("hadley.jpg") |>
  session_jump_to("/") |>
  session_history()
#>   https://hadley.nz/
#>   https://hadley.nz/hadley.jpg
#> - https://hadley.nz/

s |>
  session_jump_to("hadley.jpg") |>
  session_back() |>
  session_history()
#> - https://hadley.nz/
#>   https://hadley.nz/hadley.jpg

# \donttest{
s |>
  session_follow_link(css = "p a") |>
  html_elements("p")
#> Navigating to <https://posit.co>.
#> {xml_nodeset (20)}
#>  [1] <p class="body-sm-semibold lg:body-md-semibold text-neutral-lig ...
#>  [2] <p class="body-sm-semibold lg:body-md-semibold text-neutral-lig ...
#>  [3] <p class="sh4 uppercase mb-[8px] text-blue1">\n                 ...
#>  [4] <p class="h5 text-blue-1">Super early bird registration is open ...
#>  [5] <p class="body-lg-regular mt-[16px] text-blue1/[.62]">\n        ...
#>  [6] <p>Securely share data-science applications<br>\n across your t ...
#>  [7] <p>Our code is your code. Build on it. Share it. Improve people ...
#>  [8] <p>Take the time and effort out of uploading, storing, accessin ...
#>  [9] <p class="sh4 uppercase mb-[8px] text-blue1">\n                 ...
#> [10] <p class="mt-[8px] body-md-regular text-blue1/[.62]">\n         ...
#> [11] <p class="mt-[16px] body-md-regular text-neutral-blue62 line-cl ...
#> [12] <p class="mt-[16px] body-md-regular text-neutral-blue62 line-cl ...
#> [13] <p class="description body-lg-regular text-neutral-light/70" st ...
#> [14] <p class="body-sm-regular text-blue1/[.62] mt-[25px]">\n        ...
#> [15] <p class="ui-small uppercase text-blue1">\n                     ...
#> [16] <p class="ui-small uppercase text-blue1">\n                     ...
#> [17] <p class="ui-small uppercase text-blue1">\n                     ...
#> [18] <p class="ui-small uppercase text-blue1">\n                     ...
#> [19] <p class="ui-small uppercase text-blue1">\n                     ...
#> [20] <p class="body-md-regular body-sm-regular">We use cookies to br ...
# }