jonty wrote:
I don’t see the need to use frames, it is just a question of saving your
data in the post method and reading your data in the get
The get will fetch the current data save it in an instance variable
(@variable) and refer to a template that includes your form which has
an href of ‘/’ and method post
but can also display the current data from the @variable.
Hello,
‘@variable’ isn’t useful because they aren’t global. The global variable
like ‘@@variable_global’ could be used in a Web context ? What’s happen
when many user play with the application ?
I’ve tried to follow your advice in the following code. Yes, I know that
I 'm not good with HTML 
I’ve put comments in the code.
I can’t show the selected value in the form without reload the page !?
Suggestions ?
Tkanks.
Randy11.
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demo.rb
require ‘sinatra’
What is it done ?
1 - The “get ‘/’” show the form. In the form the method ‘POST’ is used
and call ‘request_list’.
2 - The "post ‘/request_list’ gets the parameters, save it in
session’s
variables.
3 - The “post” redirect to get “’/:start,:end,:type,:where’” which
build the data : “@data”, and display again the form.
=> PROBLEM : I lost the selected value in the form. I can’t set the
default value like : ‘<OPTION selected value = <% @start_ini %> >’.
enable :sessions
configure directives can be used to set constants
that are available in each of your views
DON’T FORGET TO STOP AND START THE APPLICATION IF THIS AREA IS
MODIFIED.
configure do
Version = Sinatra::VERSION
@data = “”
end
get ‘/’ do
erb :main_html
end
get ‘/:start,:end,:type,:where’ do
@start_ini = “’#{params[:start]}’”
@end_ini = “’#{params[:end]}’”
@type_ini = “#{params[:type]}”
@where_ini = “#{params[:where]}”
The ‘data’ are very big, so ‘cookie’ or ‘session’ can’t be used
for share ‘data’ between methods ‘get’ or ‘post’ …
May be I must call an external method from a class.
Any other idea ?
@data = "
Parameters = #{params}
" +
“start = #{params[:start]} - end = #{params[:end]}”+
" - Type = #{params[:type]} - where = #{params[:where]}
" +
"
@start_ini = #{
@start_ini},
@end_ini = #{
@end_ini}, " +
“
@type_ini = #{
@type_ini},
@where_ini = #{
@where_ini}”
I must reload de page to see de default values ‘…_ini’, then they
are
shown by ‘@data’. Why ?
erb :main_html
end
post ‘/request_list’ do
session[:start] = params.fetch(“start”).to_i
session[:end] = params.fetch(“end”).to_i
session[:where] = params.fetch(“where”)
session[:type] = params.fetch(“type”)
session[:display] = params.fetch(“display”).to_i
To avoid miss understanding with my code.
session[:where] = nil if (session[:where] == “nil”)
session[:type] = nil if (session[:type] == “nil”)
Ensure ‘start’ < ‘end’.
if (session[:start] > session[:end])
session[:start], session[:end] = session[:end], session[:start]
end
redirect “/#{session[:start]},#{session[:end]},”
“’#{session[:type]}’,’#{session[:where]}’”
end
My ‘helpers’
helpers do
Build the HTML code from an array of option for ‘SELECT’.
def html_select(array)
option=Array.new()
array.each {|opt| option << “#{opt}”}
option
end
The list of choices.
def select_options
@start_choice = html_select([ 1, 2, 3, 4])
@where_choice = html_select(%w[Here There Nowhere Somewhere])
@type_choice = html_select(%w[A B C D E F G])
# If nothing is displayed like : “”, the last thing, here :
# ‘@type_choice’, is displayed.
“”
end
end
All HTML pages here.
END
@@ main_html
Test of Sinatra.
Show some data.
You must RELOAD the page to see the previous selected values
after the 'SEND' !!! ???
<%= select_options() %>
Make your choice
Start
>
<%= @start_choice%>
End
>
<%= @start_choice%>
Where
>
<%= @where_choice%>
Type
>
<%= @type_choice%>
Display all
Show all data selected.
<%= @data%>
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