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How to run a (changing) JavaScript file within a loop in R?
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I am working in R, but I have a small Phantom JS script that opens and writes a webpage to a file (scrape_webpages.js). There are many webpages that I need to download, named in a standard format (i.e. http://webpage.net/2018), where the last part (the year) varies. The Phantom JS script takes two arguments that need to vary: the path where to save the webpage and the webpage address.
Now I know how to make a loop and iterate over the range of years I need to generate addresses and paths in R. And I can run an individual js script from within R with the system function.
But (how) can I include the js (with varying arguments) script in an R loop? Alternatively, the loop can be implemented within the js script itself, but I don't know how to do that.
Thanks for your help.
(N.B. I cannot do what the js script does directly in R)
javascript r phantomjs
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
add a comment |
I am working in R, but I have a small Phantom JS script that opens and writes a webpage to a file (scrape_webpages.js). There are many webpages that I need to download, named in a standard format (i.e. http://webpage.net/2018), where the last part (the year) varies. The Phantom JS script takes two arguments that need to vary: the path where to save the webpage and the webpage address.
Now I know how to make a loop and iterate over the range of years I need to generate addresses and paths in R. And I can run an individual js script from within R with the system function.
But (how) can I include the js (with varying arguments) script in an R loop? Alternatively, the loop can be implemented within the js script itself, but I don't know how to do that.
Thanks for your help.
(N.B. I cannot do what the js script does directly in R)
javascript r phantomjs
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
Have you tried the R packagewebshot, which is an interface to the PhantomJS API?
– Brian
Mar 27 at 17:01
had a look atwebshotbut does not seem to do the trick
– Dimiter
Mar 27 at 18:59
add a comment |
I am working in R, but I have a small Phantom JS script that opens and writes a webpage to a file (scrape_webpages.js). There are many webpages that I need to download, named in a standard format (i.e. http://webpage.net/2018), where the last part (the year) varies. The Phantom JS script takes two arguments that need to vary: the path where to save the webpage and the webpage address.
Now I know how to make a loop and iterate over the range of years I need to generate addresses and paths in R. And I can run an individual js script from within R with the system function.
But (how) can I include the js (with varying arguments) script in an R loop? Alternatively, the loop can be implemented within the js script itself, but I don't know how to do that.
Thanks for your help.
(N.B. I cannot do what the js script does directly in R)
javascript r phantomjs
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
I am working in R, but I have a small Phantom JS script that opens and writes a webpage to a file (scrape_webpages.js). There are many webpages that I need to download, named in a standard format (i.e. http://webpage.net/2018), where the last part (the year) varies. The Phantom JS script takes two arguments that need to vary: the path where to save the webpage and the webpage address.
Now I know how to make a loop and iterate over the range of years I need to generate addresses and paths in R. And I can run an individual js script from within R with the system function.
But (how) can I include the js (with varying arguments) script in an R loop? Alternatively, the loop can be implemented within the js script itself, but I don't know how to do that.
Thanks for your help.
(N.B. I cannot do what the js script does directly in R)
javascript r phantomjs
javascript r phantomjs
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
asked Mar 27 at 16:44
DimiterDimiter
63 bronze badges
63 bronze badges
Have you tried the R packagewebshot, which is an interface to the PhantomJS API?
– Brian
Mar 27 at 17:01
had a look atwebshotbut does not seem to do the trick
– Dimiter
Mar 27 at 18:59
add a comment |
Have you tried the R packagewebshot, which is an interface to the PhantomJS API?
– Brian
Mar 27 at 17:01
had a look atwebshotbut does not seem to do the trick
– Dimiter
Mar 27 at 18:59
Have you tried the R package
webshot, which is an interface to the PhantomJS API?– Brian
Mar 27 at 17:01
Have you tried the R package
webshot, which is an interface to the PhantomJS API?– Brian
Mar 27 at 17:01
had a look at
webshot but does not seem to do the trick– Dimiter
Mar 27 at 18:59
had a look at
webshot but does not seem to do the trick– Dimiter
Mar 27 at 18:59
add a comment |
1 Answer
1
active
oldest
votes
OK, I solved this. It's a bit of a hack, but might still be useful to somebody:
(1) Create the js for the first year for which data is to be downloaded
(2) Start a loop in which you:
(2a) read the js file for the previous year as a string with readChar
(2b) change what needs to be changed in this file-as-a-string with gsub
(2c) save the edited string as a new .js file with a new name with writeLines
(3) Start a new loop executing each of these js files with system function (this last step can be integrated into the previous loop if desired).
And, presto!
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
add a comment |
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1 Answer
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active
oldest
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oldest
votes
OK, I solved this. It's a bit of a hack, but might still be useful to somebody:
(1) Create the js for the first year for which data is to be downloaded
(2) Start a loop in which you:
(2a) read the js file for the previous year as a string with readChar
(2b) change what needs to be changed in this file-as-a-string with gsub
(2c) save the edited string as a new .js file with a new name with writeLines
(3) Start a new loop executing each of these js files with system function (this last step can be integrated into the previous loop if desired).
And, presto!
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
add a comment |
OK, I solved this. It's a bit of a hack, but might still be useful to somebody:
(1) Create the js for the first year for which data is to be downloaded
(2) Start a loop in which you:
(2a) read the js file for the previous year as a string with readChar
(2b) change what needs to be changed in this file-as-a-string with gsub
(2c) save the edited string as a new .js file with a new name with writeLines
(3) Start a new loop executing each of these js files with system function (this last step can be integrated into the previous loop if desired).
And, presto!
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
add a comment |
OK, I solved this. It's a bit of a hack, but might still be useful to somebody:
(1) Create the js for the first year for which data is to be downloaded
(2) Start a loop in which you:
(2a) read the js file for the previous year as a string with readChar
(2b) change what needs to be changed in this file-as-a-string with gsub
(2c) save the edited string as a new .js file with a new name with writeLines
(3) Start a new loop executing each of these js files with system function (this last step can be integrated into the previous loop if desired).
And, presto!
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
OK, I solved this. It's a bit of a hack, but might still be useful to somebody:
(1) Create the js for the first year for which data is to be downloaded
(2) Start a loop in which you:
(2a) read the js file for the previous year as a string with readChar
(2b) change what needs to be changed in this file-as-a-string with gsub
(2c) save the edited string as a new .js file with a new name with writeLines
(3) Start a new loop executing each of these js files with system function (this last step can be integrated into the previous loop if desired).
And, presto!
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
answered Mar 27 at 19:22
DimiterDimiter
63 bronze badges
63 bronze badges
add a comment |
add a comment |
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Have you tried the R package
webshot, which is an interface to the PhantomJS API?– Brian
Mar 27 at 17:01
had a look at
webshotbut does not seem to do the trick– Dimiter
Mar 27 at 18:59