[gen] Allow an ajax request to return a message, carried as a custom HTTP header and retrieved by appy.js to display a message.

fields/action.py

@@ -52,12 +52,13 @@ class Action(Field):
     pxEdit = pxSearch = ''
 
     def __init__(self, validator=None, multiplicity=(1,1), default=None,
-                 show=True, page='main', group=None, layouts=None, move=0,
-                 indexed=False, searchable=False, specificReadPermission=False,
-                 specificWritePermission=False, width=None, height=None,
-                 maxChars=None, colspan=1, action=None, result='computation',
-                 confirm=False, master=None, masterValue=None, focus=False,
-                 historized=False, mapping=None, label=None):
+                 show=('view', 'result'), page='main', group=None, layouts=None,
+                 move=0, indexed=False, searchable=False,
+                 specificReadPermission=False, specificWritePermission=False,
+                 width=None, height=None, maxChars=None, colspan=1, action=None,
+                 result='computation', confirm=False, master=None,
+                 masterValue=None, focus=False, historized=False, mapping=None,
+                 label=None):
         # Can be a single method or a list/tuple of methods
         self.action = action
         # For the 'result' param:

gen/mixins/ToolMixin.py

@@ -1284,9 +1284,10 @@ class ToolMixin(BaseMixin):
            chunk. This method executes this action.'''
         if action.startswith(':'):
             # The action corresponds to a method on Appy p_obj.
-            getattr(obj, action[1:])()
+            msg = getattr(obj, action[1:])()
         else:
             # The action must be executed on p_field if present, on obj.o else.
-            if field: getattr(field, action)(obj.o)
-            else: getattr(obj.o, action)()
+            if field: msg = getattr(field, action)(obj.o)
+            else: msg = getattr(obj.o, action)()
+        return msg
 # ------------------------------------------------------------------------------

gen/ui/appy.js

@@ -148,6 +148,9 @@ function getAjaxChunk(pos) {
         for (var i=0; i<innerScripts.length; i++) {
           eval(innerScripts[i].innerHTML);
         }
+        // Display the Appy message if present
+        var msg = xhrObjects[pos].xhr.getResponseHeader('Appy-Message');
+        if (msg) showAppyMessage(decodeURIComponent(escape(msg)));
       }
       if (responseOk) xhrObjects[pos].freed = 1;
     }
@@ -814,6 +817,15 @@ function backFromPopup() {
   window.parent.location = window.parent.location;
 }
 
+function showAppyMessage(message) {
+  // Fill the message zone with the message to display
+  var messageZone = document.getElementById('appyMessageContent');
+  messageZone.innerHTML = message;
+  // Display the message zone
+  var messageDiv = document.getElementById('appyMessage');
+  messageDiv.style.display = 'block';
+}
+
 // Function triggered when an action needs to be confirmed by the user
 function askConfirm(actionType, action, msg, showComment) {
   /* Store the actionType (send a form, call an URL or call a script) and the

gen/wrappers/ToolWrapper.py

@@ -239,14 +239,16 @@ class ToolWrapper(AbstractWrapper):
 
     # The message that is shown when a user triggers an action.
     pxMessage = Px('''
-     <div var="messages=ztool.consumeMessages()" if="messages"
-          class=":inPopup and 'messagePopup message' or 'message'">
+     <div class=":inPopup and 'messagePopup message' or 'message'"
+          style="display:none" id="appyMessage">
       <!-- The icon for closing the message -->
       <img src=":url('close')" align=":dright" class="clickable"
            onclick="this.parentNode.style.display='none'"/>
       <!-- The message content -->
-      <x>::messages</x>
-     </div>''')
+      <div id="appyMessageContent"></div>
+     </div>
+     <script type="text/javascript" var="messages=ztool.consumeMessages()"
+             if="messages">::'showAppyMessage(%s)' % q(messages)</script>''')
 
     # The page footer.
     pxFooter = Px('''

gen/wrappers/__init__.py

@@ -632,10 +632,12 @@ class AbstractWrapper(object):
              x=resp.setHeader('Content-type', ztool.xhtmlEncoding);
              x=resp.setHeader('Expires', 'Thu, 11 Dec 1975 12:05:00 GMT+2');
              x=resp.setHeader('Content-Language', lang);
-             x=resp.setHeader('CacheControl', 'no-cache')">
+             x=resp.setHeader('Cache-Control', 'no-cache')">
 
       <!-- If an action is defined, execute it on p_zobj or on p_field. -->
-      <x if="action" var2="x=ztool.executeAjaxAction(action, obj, field)"></x>
+      <x if="action"
+         var2="msg=ztool.executeAjaxAction(action, obj, field) or '';
+               x=resp.setHeader('Appy-Message', msg)"></x>
 
       <!-- Then, call the PX on p_obj or on p_field. -->
       <x if="not field">:getattr(obj, px[0])</x>