Differences

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--- en:create:filter-boolean [28.11.2014 13:37] – [Check If a Selection has the One OR Another Value] alexander.ritter
+++ en:create:filter-boolean [07.12.2023 12:31] (current) – Nested Filters empschul
@@ Line 8: / Line 8: @@
   * Does the participant usually buy -- according to a multiple-choice --  chocolate **and** dairy products?
-So-called "logical operators" (also known as "Boolean operators", see [[http://php.net/manual/en/language.operators.logical.php|PHP: Logical Operators]]) aid the linking of conditions. Three operators are required particularly frequently:
+These "logical operators" (also known as "Boolean operators", see [[http://php.net/manual/en/language.operators.logical.php|PHP: Logical Operators]]) aid the linking of conditions. Three operators are required particularly frequently:
   * The AND operator (''and'' or ''&&'') links two conditions and checks if both conditions are true.
@@ Line 97: / Line 97: @@
-If the values are not linked, then each condition can be looked up individually:
+If the values are not linked, then each condition can be called up individually:
 <code php>
@@ Line 192: / Line 192: @@
 } else {
   goToPage('end');
+}
+</code>
+===== Nested filters =====
+Sometimes it makes sense to set a filter in another filter. Let's take the situation where, depending on the answer to FF01, either question FF02 or FF03 was displayed. And now, depending on these two questions, another filter should follow. The individual filters would be simple:
+<code php>
+if (value('FF02') == 1) {
+  replace('%stimulus%', 'Dog');
+} else {
+  replace('%stimulus%', 'Cat');
+}
+</code>
+<code php>
+if (value('FF03') == 1) {
+  replace('%stimulus%', 'Wolf');
+} else {
+  replace('%stimulus%', 'Tiger');
+}
+</code>
+But now only one of these two filters should become active ... depending on which value FF01 had. To do this, these filters are placed "inside" another filter.
+<code php>
+if (value('FF01') == 1) {
+  // Filter für FF02
+  if (value('FF02') == 1) {
+    replace('%stimulus%', 'Dog');
+  } else {
+    replace('%stimulus%', 'Cat');
+  }
+} else {
+  // Filter für FF03
+  if (value('FF03') == 1) {
+    replace('%stimulus%', 'Wolf');
+  } else {
+    replace('%stimulus%', 'Tiger');
+  }
 }
 </code>