Index: openacs-4/packages/xowiki/tcl/form-field-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/form-field-procs.tcl,v
diff -u -N -r1.3 -r1.4
--- openacs-4/packages/xowiki/tcl/form-field-procs.tcl	26 Jun 2007 10:26:48 -0000	1.3
+++ openacs-4/packages/xowiki/tcl/form-field-procs.tcl	28 Jun 2007 13:02:51 -0000	1.4
@@ -22,13 +22,35 @@
     {value ""} 
     {spec ""} 
     {help_text ""}
+    {error_msg ""}
+    {validator ""}
   }
   FormField instproc init {} {
     if {![my exists label]} {my label [string totitle [my name]]}
     if {[my exists id]} {my html(id) [my id]}
     #my msg "calling config_from_spec '[my spec]'"
     my config_from_spec [my spec]
   }
+
+  FormField instproc validate {value obj} {
+    my instvar name required
+    if {$required && $value eq ""} {
+      my instvar label
+      return [_ acs-templating.Element_is_required]
+    }
+    # todo value type checker (through subtypes, check only if necessary)
+    if {[my validator] ne ""} {
+      set r [$obj [my validator] $value]
+      #my msg "validator [my validator] /[$obj procsearch [my validator]]/ returned $r"
+      if {$r != 1} {
+        set cl [namespace tail [lindex [$obj procsearch [my validator]] 0]]
+        my msg xowiki.$cl-[my validator]
+        return [_ xowiki.$cl-[my validator]]
+      }
+    }
+    return ""
+  }
+
   FormField instproc config_from_spec {spec} {
     my instvar type options widget_type
     if {[my info class] eq [self class]} {
@@ -50,6 +72,7 @@
         numeric     {my class [self class]::text; #for the time being
         }
         select      {my class [self class]::select}
+        scale       {my class [self class]::scale}
         month       {my class [self class]::month}
         date        {my class [self class]::date}
         label=*     {my label     [lindex [split $s =] 1]}
@@ -64,7 +87,7 @@
   }
 
   FormField instproc asWidgetSpec {} {
-    my instvar widget_type options label help_text format html
+    my instvar widget_type options label help_text format html display_html
     set spec $widget_type
     if {[my exists spell]} {append spec ",[expr {[my spell] ? {} : {no}}]spell"}
 
@@ -85,7 +108,9 @@
     if {[my exists format]} {
       append spec " {format " [list $format] "} "
     }
-
+    #if {[my exists display_html]} {
+     # append spec " {display_value " [list [my set display_html]] "} "
+    #}
     if {$help_text ne ""} {
       if {[string match "#*#" $help_text]} {
         set internationalized [_ [string trim $help_text #]]
@@ -119,6 +144,12 @@
         }
       }
       my render_form_widget
+      if {[my error_msg] ne ""} {
+        ::html::div -class form-error {
+          my instvar label
+          ::html::t -disableOutputEscaping [my error_msg]
+        }
+      }
     }
   }
   FormField instproc renderValue {v} {
@@ -201,6 +232,13 @@
     }
   }
 
+  Class FormField::radio -superclass FormField -parameter {
+    {options ""}
+  }
+  FormField::radio instproc initialize {} {
+    my set widget_type text(radio)
+  }
+
   Class FormField::select -superclass FormField -parameter {
     {options ""}
   }
@@ -217,13 +255,22 @@
     next
   }
 
-  Class FormField::boolean -superclass FormField -superclass FormField::select
+  Class FormField::boolean -superclass FormField -superclass FormField::radio
   FormField::boolean instproc initialize {} {
     my options {{No f} {Yes t}}
     next
   }
 
-
+  #Class FormField::scale -superclass FormField -parameter {{n 5}}
+  #FormField::scale instproc initialize {} {
+  #  my instvar n display_html 
+  #  my set widget_type text
+  #  for {set i 1} {$i < $n} {incr i} {
+  #    set checked ""
+  #    if {[my exists value] && [my value] == $i} {set checked " checked='checked'"}
+  #    append display_html "<input type='radio' name='[my name]' value='$i' $checked> "
+  #  }
+  #}
  
   #
   # a few test cases
Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -N -r1.124 -r1.125
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	27 Jun 2007 09:27:49 -0000	1.124
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	28 Jun 2007 13:02:51 -0000	1.125
@@ -45,14 +45,19 @@
   ::xowiki::Page::slot::name set required true
   ::xowiki::Page::slot::name set help_text #xowiki.Page-name-help_text#
   ::xowiki::Page::slot::name set datatype text
+  ::xowiki::Page::slot::name set validator validate_name
+
   ::xowiki::Page::slot::title set pretty_name #xowiki.Page-title#
   ::xowiki::Page::slot::title set required true
   ::xowiki::Page::slot::title set datatype text
+
   ::xowiki::Page::slot::description set pretty_name #xowiki.Page-description#
   ::xowiki::Page::slot::description set spec "textarea,cols=80,rows=2"
   ::xowiki::Page::slot::description set datatype text
+
   ::xowiki::Page::slot::text set pretty_name #xowiki.Page-text#
   ::xowiki::Page::slot::text set datatype text
+
   ::xowiki::Page::slot::nls_language set pretty_name #xowiki.Page-nls_language#
   ::xowiki::Page::slot::nls_language set datatype text
   ::xowiki::Page::slot::nls_language set spec {select,options=[xowiki::locales]}
@@ -757,6 +762,12 @@
     return $field_name:$spec
   }
 
+  Page instproc validate_name {name} {
+    upvar nls_language nls_language
+    my set data [self]  ;# for the time being; change clobbering when validate_name becomes a method
+    return [::xowiki::validate_name]
+  }
+
   Page instproc update_references {page_id references} {
     db_dml [my qn delete_references] \
         "delete from xowiki_references where page = $page_id"
@@ -1176,6 +1187,7 @@
   FormInstance ad_instproc set_form_data {} {
     Store the instance attributes in the form.
   } {
+    #my msg "set_form_value instance attributes = [my instance_attributes]"
     foreach {att value} [my instance_attributes] {
       #my msg "set_form_value $att $value"
       my set_form_value $att $value
@@ -1186,22 +1198,32 @@
     Get the values from the form and store it as
     instance attributes.
   } {
+    set form_errors [list]
     set form [lindex [my get_from_template form] 0]
     if {$form ne ""} {
+      array set name_map {"__name" name "__title" title "__page_order" page_order}
       array set __ia [my set instance_attributes]
       # we have a form, we get for the time being all variables
       foreach att [::xo::cc array names form_parameter] {
+        set matt [expr {[info exists name_map($att)] ? $name_map($att) : $att}]
+        set f    [my create_form_field -name $att -slot [my find_slot $matt]]
+        set value [::xo::cc form_parameter $att]
+        set form_error [$f validate $value [self]]
+        if {$form_error ne ""} {
+          lappend form_errors $att $form_error
+        }
         switch -- $att {
           __object_name {}
-          __name        {my set name       [::xo::cc form_parameter $att]}
-          __title       {my set title      [::xo::cc form_parameter $att]}
-          __page_order  {my set page_order [::xo::cc form_parameter $att]}
-          default       {set __ia($att)    [::xo::cc form_parameter $att]}
+          __name        {my set $matt    $value}
+          __title       {my set $matt    $value}
+          __page_order  {my set $matt    $value}
+          default       {set __ia($att)  $value}
         }
       }
       my log "--set instance attributes to [array get __ia]"
       my set instance_attributes [array get __ia]
     }
+    return $form_errors
   }
 
   FormInstance instproc form_attributes {} {
@@ -1240,6 +1262,7 @@
       return [next]
     } else {
       set form [lindex [my get_from_template form] 0]
+      #my msg "we have a form"
       dom parse -simple -html $form doc
       $doc documentElement root
       my set_form_data
@@ -1276,19 +1299,17 @@
     Method to be called from a submit button of the form
   } {
     my instvar package_id name
-    my get_form_data
-    my set data [self]  ;# for the time being; change clobbering when validate_name becomes a method
-    set ok [::xowiki::validate_name]
-    my log "--forminstance name='$name', old_name=[::xo::cc form_parameter __object_name] ok=$ok"
-    if {$ok} {
+    set validation_errors [my get_form_data]
+    if {$validation_errors ne [list]} {
+      foreach {att msg} $validation_errors {
+        my msg "Error in $name: $att"
+      }
+      my edit -validation_errors $validation_errors
+    } else {
       my save_data [::xo::cc form_parameter __object_name ""]
       my log "--forminstance redirect to [$package_id pretty_link $name]"
       $package_id returnredirect \
           [my query_parameter "return_url" [$package_id pretty_link $name]]
-    } else {
-      util_user_message -message "Another item with the name name $name exists already"
-      set name  [::xo::cc form_parameter __object_name]
-      $package_id returnredirect [::xo::cc url]?m=edit
     }
   }
 
Index: openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl,v
diff -u -N -r1.56 -r1.57
--- openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	27 Jun 2007 09:27:49 -0000	1.56
+++ openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	28 Jun 2007 13:02:51 -0000	1.57
@@ -210,7 +210,11 @@
     }
   }
 
-  Page instproc edit {{-new:boolean false} {-autoname:boolean false}} {
+  Page instproc edit {
+    {-new:boolean false} 
+    {-autoname:boolean false}
+    {-validaton_errors ""}
+  } {
     my instvar package_id item_id revision_id
     $package_id instvar folder_id  ;# this is the root folder
 
@@ -332,15 +336,21 @@
                -label     $label \
                -type      [expr {[$slot exists datatype] ?  [$slot set datatype] : "text"}] \
                -help_text [expr {[$slot exists help_text] ? [$slot set help_text] : ""}] \
+               -validator [expr {[$slot exists validator] ? [$slot set validator] : ""}] \
                -required  [expr {[$slot exists required]  ? [$slot set required]  : "false"}] \
                -spec      [join $spec_list ,] \
               ]
     $f destroy_on_cleanup
-    $f configure $configuration
+    eval $f configure $configuration
     return $f
   }
 
-  PageInstance instproc create_form_field {-name -slot {-spec ""} {-configuration ""}} {
+  PageInstance instproc create_form_field {
+    -name 
+    -slot 
+    {-spec ""} 
+    {-configuration ""}
+  } {
     set short_spec [my get_short_spec $name]
     set spec_list [list]
     if {$short_spec ne ""} {lappend spec_list $short_spec}
@@ -350,15 +360,39 @@
     return $f
   }
 
-  FormInstance instproc edit {} {
+  FormInstance instproc create_form_fields {fields root fcn validation_errors} {
+    array set errors $validation_errors
+    foreach {formatt att} $fields {
+      set error_msg ""
+      if {[info exists errors($formatt)]} {set error_msg $errors($formatt)}
+
+      set f [my create_form_field -name $formatt -slot [my find_slot $att] \
+                   -configuration [list -value [my set $att] -error_msg $error_msg]]
+      $root insertBeforeFromScript {$f render_item} $fcn
+    }
+  }
+
+  FormInstance instproc edit {    
+    {-validation_errors ""}
+  } {
     my instvar page_template doc root package_id
-    
+
+    if {[my form_parameter __form_action ""] eq "save-form-data"} {
+      set validation_errors [my get_form_data]
+      if {$validation_errors ne [list]} {
+        foreach {att msg} $validation_errors {
+          my msg "Error in $att: $msg"
+        }
+        # reset the name in error cases to the original one
+        my set name [my form_parameter __object_name]
+      } else {
+        #$package_id returnredirect [::xo::cc url]?m=edit
+        #my edit -validation_errors $validation_errors
+      }
+    }
     set form [lindex [my get_from_template form] 0]
-    my log "--forminstance form='$form'"
-    set anon_instances   [my get_from_template anon_instances]
-    #set form_constraints [my get_from_template form_constraints]
-    #my log "--forminstance anon_instances='$anon_instances' fc='$form_constraints'"
-    my log "--forminstance anon_instances='$anon_instances'"
+    set anon_instances [my get_from_template anon_instances]
+
     if {$form eq ""} {
       #next -autoname $anon_instances -form_constraints $form_constraints
       next -autoname $anon_instances
@@ -370,22 +404,16 @@
       $root firstChild fcn
       $root insertBeforeFromScript {
         ::html::input -type hidden -name __object_name -value [my name]
+        ::html::input -type hidden -name __form_action -value save-form-data
       } $fcn
       
       if {$anon_instances eq "f"} {
-        set f [my create_form_field -name __name -slot [my find_slot name] \
-                   -configuration [list -value [my set name]]]
-        $root insertBeforeFromScript {$f render_item} $fcn
-
 	if {[$package_id show_page_order]} {
-	  set f [my create_form_field -name __page_order -slot [my find_slot page_order] \
-		     -configuration [list -value [my set page_order]]]
-	  $root insertBeforeFromScript {$f render_item} $fcn
-	}
-
-        set f [my create_form_field -name __title -slot [my find_slot title] \
-                   -configuration [list -value [my set title]]]
-        $root insertBeforeFromScript {$f render_item} $fcn
+          set fields {__name name __page_order page_order __title title}
+        } else {
+          set fields {__name name __title title}
+        }
+        my create_form_fields $fields $root $fcn $validation_errors
       }
 
       $root appendFromScript {
@@ -396,7 +424,7 @@
       if {$form eq ""} {
         my msg "no form found in page [$page_template name]"
       } else {
-        $form setAttribute action [$package_id pretty_link [my name]]?m=save-form-data method POST
+        $form setAttribute action [$package_id pretty_link [my name]]?m=edit method POST
         set oldCSSClass [expr {[$form hasAttribute class] ? [$form getAttribute class] : ""}]
         $form setAttribute class [string trim "$oldCSSClass margin-form"]
       }