#!../../src/xotclsh
# $Id: FormsWithState.xotcl,v 1.1 2004/05/23 22:50:39 neumann Exp $
#
# Demo Program for Multi-Page Forms implemented via hidden
# Form Fields -gn
#
package require XOTcl 1; namespace import -force xotcl::*
package require xotcl::actiweb::htmlPlace
package require xotcl::actiweb::webDocument
HtmlPlace receiver -port 8086
# The following class is used to define HTML-pages
Class HTMLPage -superclass HtmlDocument -parameter {
{pageContent ""}
{pageTitle ""}
{pageHeader ""}
endCmd
}
HTMLPage instproc init args {
receiver exportObjs [self]
next
}
# instproc default is evoked whenever an HTMLDocument object
# is called without a specific method.
HTMLPage instproc default args {
my instvar content
# creates HTML page content
set content
append content \
[my set pageTitle] \
[my set pageHeader] \n \
[my set pageContent]
# substitutes all embedded commands and variables in content
set content [subst $content]
# An HTMLPage can provide a command, which is executed after
# the content is computed; this mechanism is used here for deleting
# the context object
if {[my exists endCmd]} {
eval [my set endCmd]
}
# next sends content to the client
next
}
# The form state is kept in a context object. The method varname
# accesses variables from the context object or returns empty values.
HTMLPage instproc get varname {
my instvar context
if {[$context exists $varname]} {
return [$context set $varname]
} else {
return ""
}
}
# The final page will contain a table with all the variables in
# the context object
HTMLPage instproc printAll {} {
my instvar context
set result "
| |
Submission
You submitted the following values:
|
| | | \n"
# creates a table row for each variable and
# it's value of the current context object
foreach var [$context info vars] {
append result | $var: | \
[$context set $var] | \n
}
return "$result \n |
"
}
HTMLPage form1
form1 proc default {} {
set values {}
# process the form data from post method
foreach a [my getFormData] {
set name [$a set name]
switch -glob $name {
*.html {set nextPage $name}
context {set context [$a set content]}
default {lappend values $name [$a set content]}
}
}
# save the form data in the context object
foreach {name value} $values {
$context set $name $value
}
if {![info exists nextPage]} {
# We assume, we are called the first time...
# Create a new context object and call the first page
set context [Object new]
set nextPage [self]/page1.html
}
$nextPage set context $context
# delegeate to the actual form page
$nextPage default
}
HTMLPage form1/page1.html -pageTitle "First Page" -pageContent {