Export Events of a REDCap project
redcap_event_read(
redcap_uri,
token,
verbose = TRUE,
config_options = NULL,
handle_httr = NULL
)The uri/url of the REDCap server typically formatted as "https://server.org/apps/redcap/api/". Required.
The user-specific string that serves as the password for a project. Required.
A boolean value indicating if messages should be printed
to the R console during the operation. The verbose output might contain
sensitive information (e.g. PHI), so turn this off if the output might
be visible somewhere public. Optional.
A list of options passed to httr::POST().
See details at httr::httr_options(). Optional.
The value passed to the handle parameter of
httr::POST().
This is useful for only unconventional authentication approaches. It
should be NULL for most institutions. Optional.
Currently, a list is returned with the following elements:
data: a tibble::tibble() with one row per arm-event combination. The
columns are event_name (a human-friendly string), arm_num (an integer),
unique_event_name (a string), custom_event_label (a string), and
event_id (an integer).
success: A boolean value indicating if the operation was apparently
successful.
status_code: The
http status code
of the operation.
outcome_message: A human readable string indicating the operation's
outcome.
elapsed_seconds: The duration of the function.
raw_text: If an operation is NOT successful, the text returned by
REDCap. If an operation is successful, the raw_text is returned as an
empty string to save RAM.
The official documentation can be found on the 'API Help Page' and 'API Examples' pages on the REDCap wiki (i.e., https://community.projectredcap.org/articles/456/api-documentation.html and https://community.projectredcap.org/articles/462/api-examples.html). If you do not have an account for the wiki, please ask your campus REDCap administrator to send you the static material.
# \dontrun{
uri <- "https://bbmc.ouhsc.edu/redcap/api/"
# Query a longitudinal project with a single arm and 3 events
token_1 <- "786334BEB4A87D572DD0E99C4BFCE144"
result_1 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_1)
#> The list of events was retrieved from the REDCap project in 0.4 seconds. The http status code was 200.
result_1$data
#> # A tibble: 3 × 5
#> event_name arm_num unique_event_name custom_event_label event_id
#> <chr> <int> <chr> <chr> <int>
#> 1 Intake 1 intake_arm_1 NA 12357
#> 2 Dischage 1 dischage_arm_1 NA 12358
#> 3 Follow up 1 follow_up_arm_1 NA 12359
# Query a longitudinal project with 2 arms and complex arm-event mappings
token_2 <- "0434F0E9CF53ED0587847AB6E51DE762"
result_2 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_2)
#> The list of events was retrieved from the REDCap project in 0.2 seconds. The http status code was 200.
result_2$data
#> # A tibble: 12 × 5
#> event_name arm_num unique_event_name custo…¹ event…²
#> <chr> <int> <chr> <chr> <int>
#> 1 Enrollment 1 enrollment_arm_1 NA 2888
#> 2 Dose 1 1 dose_1_arm_1 NA 2889
#> 3 Visit 1 1 visit_1_arm_1 NA 2890
#> 4 Dose 2 1 dose_2_arm_1 NA 2891
#> 5 Visit 2 1 visit_2_arm_1 NA 2892
#> 6 Final visit 1 final_visit_arm_1 NA 2895
#> 7 Enrollment 2 enrollment_arm_2 NA 2896
#> 8 Deadline to opt out of study 2 deadline_to_opt_ou_arm_2 NA 2897
#> 9 First dose 2 first_dose_arm_2 NA 2898
#> 10 First visit 2 first_visit_arm_2 NA 2899
#> 11 Final visit 2 final_visit_arm_2 NA 2902
#> 12 Deadline to return feedback 2 deadline_to_return_arm_2 NA 2903
#> # … with abbreviated variable names ¹custom_event_label, ²event_id
# Query a classic project without events
token_3 <- "D70F9ACD1EDD6F151C6EA78683944E98"
result_3 <- REDCapR::redcap_event_read(redcap_uri=uri, token=token_3)
#> A 'classic' REDCap project has no events. Retrieved in 0.1 seconds. The http status code was 400.
result_3$data
#> # A tibble: 0 × 5
#> # … with 5 variables: event_name <chr>, arm_num <int>, unique_event_name <chr>,
#> # custom_event_label <chr>, event_id <int>
# }