jonty said:
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.
######################################################################
# 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 = "<p> Parameters = #{params} <BR>" +
"start = #{params[:start]} - end = #{params[:end]}"+
" - Type = #{params[:type]} - where = #{params[:where]}</p>" +
"<BR> @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 << "<OPTION>#{opt}</OPTION>"}
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
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html;
charset=iso-8859-1">
<TITLE>Test of Sinatra.</TITLE>
<h1>Show some data.</h1>
<h2>You must RELOAD the page to see the previous selected values
after the 'SEND' !!! ??? </h2>
</HEAD>
<BODY>
<DIV id='main_form' >
<FORM METHOD="post" action="request_list">
<!-- Call 'select_option()' in the helper to fill the 'SELECT'. -->
<%= select_options() %>
<FIELDSET>
<LEGEND>Make your choice</LEGEND>
<LABEL for="end">Start</LABEL>
<SELECT name="start" >
<OPTION selected value=<%= @start_ini %> > </OPTION>
<%= @start_choice%>
</SELECT>
<LABEL for="end">End</LABEL>
<SELECT name="end">
<OPTION selected value=<%= @end_ini %> > </OPTION>
<%= @start_choice%>
</SELECT>
<LABEL for="where">Where</LABEL>
<SELECT name="where">
<OPTION selected value=<%= @where_ini %> ></OPTION>
<%= @where_choice%>
</SELECT>
<LABEL for="type">Type</LABEL>
<SELECT name="type">
<OPTION selected value=<%= @type_ini %> ></OPTION>
<%= @type_choice%>
</SELECT>
Display all
<INPUT TYPE="checkbox" name="display" value="1" checked></INPUT>
<INPUT type="submit" name="submit" value="Send">
</FIELDSET>
</FORM>
</DIV > <!-- End of the form. ' -->
<DIV>
<h1>Show all data selected.</h1>
<%= @data%>
</DIV>
</BODY>
######################################################################
