preserve user input in case of form validation errors

owrx/controllers/settings/__init__.py

@@ -20,6 +20,7 @@ class SettingsFormController(AuthorizationMixin, BreadcrumbMixin, WebpageControl
         super().__init__(handler, request, options)
         self.errors = {}
         self.globalError = None
+        self.formData = None
 
     @abstractmethod
     def getSections(self):
@@ -35,8 +36,18 @@ class SettingsFormController(AuthorizationMixin, BreadcrumbMixin, WebpageControl
     def getErrors(self):
         return self.errors
 
+    def buildRenderData(self):
+        # this basially builds an intermediate result to be rendered
+        # relevant when the form has to be displayed again due to errors
+        # in this specific scenario, we mix the config with the data the user already submitted
+        # we use a copy of the config so that whatever we apply here does not get accidentally stored
+        res = self.getData().__dict__()
+        if self.formData is not None:
+            self._applyConfigData(res, self.formData)
+        return res
+
     def render_sections(self):
-        sections = "".join(section.render(self.getData(), self.getErrors()) for section in self.getSections())
+        sections = "".join(section.render(self.buildRenderData(), self.getErrors()) for section in self.getSections())
         buttons = self.render_buttons()
         return """
             <form class="settings-body" method="POST">
@@ -97,6 +108,7 @@ class SettingsFormController(AuthorizationMixin, BreadcrumbMixin, WebpageControl
             self.globalError = str(e)
             return self.indexAction()
 
+        self.formData = data
         if errors:
             self.errors = self._mergeErrors(errors)
             return self.indexAction()
@@ -109,14 +121,17 @@ class SettingsFormController(AuthorizationMixin, BreadcrumbMixin, WebpageControl
             self.globalError = str(e)
             return self.indexAction()
 
-    def processData(self, data):
-        config = self.getData()
+    def _applyConfigData(self, dest, data):
         for k, v in data.items():
             if v is None:
-                if k in config:
-                    del config[k]
+                if k in dest:
+                    del dest[k]
             else:
-                config[k] = v
+                dest[k] = v
+
+    def processData(self, data):
+        config = self.getData()
+        self._applyConfigData(config, data)
 
     def store(self):
         Config.get().store()

owrx/form/input/__init__.py

@@ -91,11 +91,13 @@ class Input(ABC):
     def parse(self, data):
         if self.id in data:
             value = self.converter.convert_from_form(data[self.id][0])
-            if self.validator is not None:
-                self.validator.validate(self.id, value)
             return {self.id: value}
         return {}
 
+    def validate(self, data):
+        if self.id in data and self.validator is not None:
+            self.validator.validate(self.id, data[self.id])
+
     def getLabel(self):
         return self.label
 

owrx/form/input/location.py

@@ -59,6 +59,4 @@ class LocationInput(Input):
 
     def parse(self, data):
         value = {k: float(data["{0}-{1}".format(self.id, k)][0]) for k in ["lat", "lon"]}
-        if self.validator is not None:
-            self.validator.validate(self.id, value)
         return {self.id: value}

owrx/form/section.py

@@ -34,7 +34,9 @@ class Section(object):
         errors = []
         for i in self.inputs:
             try:
-                parsed_data.update(i.parse(data))
+                res = i.parse(data)
+                parsed_data.update(res)
+                i.validate(res)
             except FormError as e:
                 errors.append(e)
             except Exception as e: