Hi All,
I am saving some html code in an Array, I then want to extract certain
values from the html code.
I have saved the html code into an Array but having difficulty
manipulating the elements to extract the exact value that I require from
the html code.
Here is the code:
#searches for images in the page which indicate platform number and
stores them in an array
platImages = (@doc/'img[@width^="54"]')
#above search returns an unwanted image, so delete
platImages.pop
#puts platImages
#go through images names to get platform number
platImages.each { |img|
#convert element to string
img.to_s
#in this part, I have tried various string manipulation
methods to extract the values that i need, but doesn't seem to work, it
either returns nil for each element or throws an error
puts img
}
Any help is greatly appreciated.
Saeed.
···
--
Posted via http://www.ruby-forum.com/.
I have saved the html code into an Array but having difficulty
manipulating the elements to extract the exact value that I require from
the html code.
What difficulty?
\#in this part, I have tried various string manipulation
methods to extract the values that i need, but doesn't seem to work, it
either returns nil for each element or throws an error
What do you want to do? What have you tried? What happened? Why wasn't
it what you wanted?
Any help is greatly appreciated.
Provide more details, get more help 
···
On Mar 24, 4:07 am, Saeed Bhuta <saeed.bh...@placr.co.uk> wrote:
Gavin Kistner wrote:
I have saved the html code into an Array but having difficulty
manipulating the elements to extract the exact value that I require from
the html code.
What difficulty?
� � � � � � � � #in this part, I have tried various string manipulation
methods to extract the values that i need, but doesn't seem to work, it
either returns nil for each element or throws an error
What do you want to do? What have you tried? What happened? Why wasn't
it what you wanted?
Any help is greatly appreciated.
Provide more details, get more help
require 'rubygems'
require 'hpricot'
require 'open-uri'
#open the web page
@doc= Hpricot(open("http://www.website.com"))
#searches for images in the page and stores them in an array
images = (@doc/'img[@width^="54"]')
#puts images
#go through images names to get platform number
images.each { |img|
img.to_s
#extract characters one to four from image name
img[0,4]
puts img
}
However this returns the error 'wrong number of arguments (2 for 1)
(ArgumentError)'
Hope this make sense...
Saeed
···
On Mar 24, 4:07�am, Saeed Bhuta <saeed.bh...@placr.co.uk> wrote:
--
Posted via http://www.ruby-forum.com/\.
Gavin Kistner wrote:
I have saved the html code into an Array but having difficulty
manipulating the elements to extract the exact value that I require from
the html code.
What difficulty?
� � � � � � � � #in this part, I have tried various string manipulation
methods to extract the values that i need, but doesn't seem to work, it
either returns nil for each element or throws an error
What do you want to do? What have you tried? What happened? Why wasn't
it what you wanted?
Any help is greatly appreciated.
Provide more details, get more help
require 'rubygems'
require 'hpricot'
require 'open-uri'
#open the web page
@doc= Hpricot(open("http://www.website.com"))
#searches for images in the page and stores them in an array
images = (@doc/'img[@width^="54"]')
#puts images
#go through images names to get platform number
images.each { |img|
img.to_s
#extract characters one to four from image name
img[0,4]
Assuming your problem is here^
img.to_s does not convert the image to a string (img is a dom element, right?)
Try something like img.to_s[0,4] or img['src'][0,4] (but please look in the documentation for Hpricot to see how to get the part you want as a string).
-Rob
puts img
}
However this returns the error 'wrong number of arguments (2 for 1)
(ArgumentError)'
Hope this make sense...
Saeed
--
Posted via http://www.ruby-forum.com/\.
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
···
On Mar 24, 2010, at 9:28 AM, Saeed Bhuta wrote:
On Mar 24, 4:07�am, Saeed Bhuta <saeed.bh...@placr.co.uk> wrote:
Rob Biedenharn wrote:
string manipulation
Provide more details, get more help
#puts images
#go through images names to get platform number
images.each { |img|
img.to_s
#extract characters one to four from image name
img[0,4]
Assuming your problem is here^
img.to_s does not convert the image to a string (img is a dom element,
right?)
Try something like img.to_s[0,4] or img['src'][0,4] (but please look
in the documentation for Hpricot to see how to get the part you want
as a string).
-Rob
Posted via http://www.ruby-forum.com/\.
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
Thanks Rob, I did:
platNo = img['src'].to_s
#extract the platform number from the image name
puts platNo[1,1]
And it returns the value I need.
Once again, many thanks.
Saeed
···
On Mar 24, 2010, at 9:28 AM, Saeed Bhuta wrote:
--
Posted via http://www.ruby-forum.com/\.