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forschungslabor_digitale_Methoden
regpkr
Commits
83de5bda
Commit
83de5bda
authored
5 years ago
by
Gallenkamp, Fabian
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Update exercise2.R
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exercise2.R
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exercise2.R
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exercise2.R
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83de5bda
...
@@ -8,6 +8,7 @@ setwd(dirname(rstudioapi::getSourceEditorContext()$path))
...
@@ -8,6 +8,7 @@ setwd(dirname(rstudioapi::getSourceEditorContext()$path))
source
(
"./exercise1.R"
)
source
(
"./exercise1.R"
)
scrape_regpk_links
<-
function
(
remote_driver
)
{
scrape_regpk_links
<-
function
(
remote_driver
)
{
# select only links containing 'regierungspressekonferenz'
items
<-
remote_driver
$
findElements
(
using
=
"xpath"
,
"//a[@class='bpa-teaser']"
)
%>%
items
<-
remote_driver
$
findElements
(
using
=
"xpath"
,
"//a[@class='bpa-teaser']"
)
%>%
purrr
::
map
(
function
(
x
){
x
$
getElementAttribute
(
'href'
)})
%>%
purrr
::
map
(
function
(
x
){
x
$
getElementAttribute
(
'href'
)})
%>%
purrr
::
keep
(
function
(
x
){
str_detect
(
x
,
"regierungspressekonferenz"
)})
purrr
::
keep
(
function
(
x
){
str_detect
(
x
,
"regierungspressekonferenz"
)})
...
@@ -24,22 +25,22 @@ rsdriver <- NULL
...
@@ -24,22 +25,22 @@ rsdriver <- NULL
out
<-
tryCatch
({
out
<-
tryCatch
({
retrieved_items
=
list
()
retrieved_items
=
list
()
# create browser instance and set up communication with webdriver (select a chrome version according to your installation, refer also to above troubleshooting to see possible values)
rsdriver
<-
rsDriver
(
browser
=
c
(
"chrome"
),
chromever
=
"79.0.3945.36"
,
port
=
8888L
,
)
rsdriver
<-
rsDriver
(
browser
=
c
(
"chrome"
),
chromever
=
"79.0.3945.36"
,
port
=
8888L
,
)
# get webdriver
remote_driver
<-
rsdriver
[[
"client"
]]
remote_driver
<-
rsdriver
[[
"client"
]]
# goto first search page
remote_driver
$
navigate
(
"https://www.bundesregierung.de/breg-de/aktuelles/pressekonferenzen"
)
remote_driver
$
navigate
(
"https://www.bundesregierung.de/breg-de/aktuelles/pressekonferenzen"
)
# wait some time
#
randomized_sleep()
randomized_sleep
()
# collect relevant search items on current page
# collect relevant search items on current page
new_items
<-
scrape_regpk_links
(
remote_driver
)
new_items
<-
scrape_regpk_links
(
remote_driver
)
retrieved_items
<-
retrieved_items
%>%
append
(
new_items
)
retrieved_items
<-
retrieved_items
%>%
append
(
new_items
)
i
<-
0
i
<-
0
max_pages
=
0
max_pages
=
2
while
(
TRUE
)
{
while
(
TRUE
)
{
# press next unitil not possible or max pages reached
link_next_page
<-
remote_driver
$
findElement
(
value
=
'//li[@class = "bpa-pager-next"]/a'
)
link_next_page
<-
remote_driver
$
findElement
(
value
=
'//li[@class = "bpa-pager-next"]/a'
)
...
@@ -47,7 +48,7 @@ out <- tryCatch({
...
@@ -47,7 +48,7 @@ out <- tryCatch({
break
break
}
}
link_next_page
$
clickElement
()
link_next_page
$
clickElement
()
# wait some time again
randomized_sleep
()
randomized_sleep
()
# collect relevant search items on current page
# collect relevant search items on current page
...
@@ -59,16 +60,16 @@ out <- tryCatch({
...
@@ -59,16 +60,16 @@ out <- tryCatch({
# close browser, rest uses xml2 and rvest from previous exercise
# close browser, rest uses xml2 and rvest from previous exercise
remote_driver
$
close
()
remote_driver
$
close
()
# scrape all regpks with links obtained above
retrieved_regpks
=
list
()
retrieved_regpks
=
list
()
for
(
item
in
retrieved_items
){
for
(
item
in
retrieved_items
){
print
(
item
[[
1
]])
#
print(item[[1]])
retrieved_regpks
<-
retrieved_regpks
%>%
append
(
list
(
scrape_regpk_current
(
item
[[
1
]])))
retrieved_regpks
<-
retrieved_regpks
%>%
append
(
list
(
scrape_regpk_current
(
item
[[
1
]])))
}
}
# write result into json file
retrieved_regpks
%>%
toJSON
(
encoding
=
"UTF-8"
,
pretty
=
TRUE
,
auto_unbox
=
TRUE
)
%>%
readr
::
write_file
(
"./result.json"
)
retrieved_regpks
%>%
toJSON
(
encoding
=
"UTF-8"
,
pretty
=
TRUE
,
auto_unbox
=
TRUE
)
%>%
readr
::
write_file
(
"./result.json"
)
},
},
error
=
function
(
cond
)
{
error
=
function
(
cond
)
{
message
(
"Here's the original error message:"
)
message
(
"Here's the original error message:"
)
...
...
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