#3953 / Radio buttons: Auswahl nicht angezeigt, wenn per itemList definiert

Fixed. Problem was a comparison on equal value  AND equal type: '==='. Bug happened (probably) only for numeric items.

extension/Documentation/Manual.rst

@@ -37,6 +37,8 @@ The following features are only tested on linux hosts:
 * Concatenation of PDF files - command `pdftk`.
 * Mime type detection for uploads - command `file`.
 
+.. _`preparation`:
+
 Preparation
 -----------
 
@@ -1247,6 +1249,7 @@ The *FormElement.parameter*=*typeAheadLdap* will trigger LDAP searches on every
   * Optional: *ldapUseBindCredentials* = 1
 
 All fetched LDAP values will be formatted with:
+
 * *typeAheadLdapValuePrintf*, shown to the user in a drop-down box and
 * *typeAheadLdapIdPrintf*, which represents the final data to save.
 
@@ -4312,7 +4315,7 @@ Example `_link`: ::
 
 Example `_pdf`, `_zip`: ::
 
-	# File 1: id=1&--orientation=Landscape&--page-size=A3
+	# File 1: U:id=1&--orientation=Landscape&--page-size=A3
 	# File 2: U:id=form
 	# File 3: f:fileadmin/file.pdf
 	SELECT 't:PDF|a:Creating a new PDF|U:id=1&--orientation=Landscape&--page-size=A3|U:id=form|f:fileadmin/file.pdf' AS _pdf
@@ -5230,3 +5233,60 @@ Same as above, but written in the nested notation ::
   }
 
 * Columns starting with a '_' won't be printed but can be accessed as regular columns.
+
+Help
+====
+
+* Does the error happens on every *page* or only on specific one?
+* Does the error happens on every *form* or only on specific one?
+
+Tips:
+
+* On general errors:
+
+	* Always check the Javascript console of your browser, see `javascriptProblem`_.
+	* Always check the Webserver logfiles, see `webserverErrorLog`_.
+
+
+Error Messages
+--------------
+
+Internal Server Error
+'''''''''''''''''''''
+
+The browser shows a red popup with 'Internal Server Error'. The message is generated in the browser. Happens e.g. an AJAX
+request response of QFQ (=Server) is broken. This might happen e.g. if PHP can't start successfully or PHP fails to run
+due to  a missing php module or broken configuration.
+
+
+
+.. _`javascriptProblem`:
+
+Javascript problem
+------------------
+
+Open the 'Webdeveloper Tools' (FF: F12, Chrome/Opera: Right mouse click > Inspect Element) in your browser, switch to
+'console' and reload the page. Inspect the messages.
+
+
+.. _`webserverErrorLog`:
+
+Webserver error log
+-------------------
+
+For apache: /var/log/apache2/error_log
+
+
+Call to undefined function qfq\\mb_internal_encoding()
+''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Check that all required php modules are installed. See `preparation`_.
+
+QFQ specific
+------------
+
+Variable empty: {{...}}
+'''''''''''''''''''''''
+
+Specify the required sanatize class. Remember: for STORE_FORM and STORE_CLIENT the default is `digit`. This means if
+the variable content is a string, this violates the sanatize class and the replaced content will be an empty string!
\ No newline at end of file

extension/qfq/qfq/AbstractBuildForm.php

@@ -1957,7 +1957,7 @@ abstract class AbstractBuildForm {
             $attribute .= Support::doAttribute('value', $itemKey[$ii], false); // Always set value, even to '' - #3832
             $attribute .= Support::doAttribute('title', $formElement[FE_TOOLTIP]);
 
-            if ($itemKey[$ii] === $value) {
+            if ($itemKey[$ii] == $value) {
                 $attribute .= Support::doAttribute('checked', 'checked');
                 $classActive = ' active';
             }
@@ -2040,7 +2040,7 @@ abstract class AbstractBuildForm {
             $attribute .= Support::doAttribute('value', $itemKey[$ii], false); // Always set value, even to '' - #3832
             $attribute .= Support::doAttribute('title', $formElement[FE_TOOLTIP]);
 
-            if ($itemKey[$ii] === $value) {
+            if ($itemKey[$ii] == $value) {
                 $attribute .= Support::doAttribute('checked', 'checked');
             }