Ruby CGI and blank form fields

ruby-talk
1

What would be the best way to check if a user enters a value into a form
using ruby cgi?

I have some code that should only run if the user is uploading a file
but nil tests and key tests don't seem to prevent the code from
executing even if they don't upload anything.

two things I have tried(that didn't work) can be found below. Perhaps I
am missing something obvious?

if cgi.has_key?('upload')
  #stuff to do if there is an image to upload
end

unless cgi.params['upload'].first.nil?
  #stuff to do if there is an image to upload
end

Here is the form itself

···

--------------------
<FORM ENCTYPE="multipart/form-data" action="imageadmin.rb" method="post">
<%imageArray.length.times do |count|%>
  <img src="<%=imageArray[count]%>">
  <BR />
  Comment:<input type="text" name="comment"
value="<%=commentArray[count]%>">
  <BR />
  Number:<input type="text" name="order"
value="<%=imageArray[count][0..2] %>">
  <BR />
  Delete:<input type="checkbox" name="delete"
value="<%=imageArray[count]%>">
  <BR />
<%end%>
<BR />
<input type="file" name="upload"> Comment:<input type="text" name="uploadcomment" value="">

<BR />
<input type="submit" value="Submit">
</FORM>
----------------------------

Thank you,
Matthew Margolis

2

Please ignore this message. I sent it to the list almost two days ago and for some reason delivery was delayed a day. I have figured out my problem.

Thank you,
Matthew Margolis

Matthew Margolis wrote:

···

What would be the best way to check if a user enters a value into a form
using ruby cgi?

I have some code that should only run if the user is uploading a file
but nil tests and key tests don't seem to prevent the code from
executing even if they don't upload anything.

two things I have tried(that didn't work) can be found below. Perhaps I
am missing something obvious?

if cgi.has_key?('upload')
#stuff to do if there is an image to upload
end

unless cgi.params['upload'].first.nil?
#stuff to do if there is an image to upload
end

Here is the form itself
--------------------
<FORM ENCTYPE="multipart/form-data" action="imageadmin.rb" method="post">
<%imageArray.length.times do |count|%>
<img src="<%=imageArray[count]%>">
<BR />
Comment:<input type="text" name="comment"
value="<%=commentArray[count]%>">
<BR />
Number:<input type="text" name="order"
value="<%=imageArray[count][0..2] %>">
<BR />
Delete:<input type="checkbox" name="delete"
value="<%=imageArray[count]%>">
<BR />
<%end%>
<BR />
<input type="file" name="upload"> Comment:<input type="text" name="uploadcomment" value="">

<BR />
<input type="submit" value="Submit">
</FORM>
----------------------------

Thank you,
Matthew Margolis

3

Why not post the solution, so that the next person googling for the
issue will have a pointer.

martin

···

Matthew Margolis <mrmargolis@wisc.edu> wrote:

Please ignore this message. I sent it to the list almost two days ago
and for some reason delivery was delayed a day. I have figured out my
problem.