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--- en:create:combine [23.11.2020 16:00] – ["Don't Know" for Multiple Scales] sophia.schauer
+++ en:create:combine [19.05.2021 20:54] – sophia.schauer
@@ Line 2: / Line 2: @@
 You might want to ask different options about one item. For example the rating of a characteristic and its importance. This is how to implement this.
+**Note:** Please be sure to also read the notes on mobile devices below.
 **Example 1**\\
@@ Line 210: / Line 212: @@
+===== Mobile devices and responsive display =====
+A relevant part of the respondants fill in the questionnaire not on an computer but on a mobile device. The most questions in SoSci Survey switch to a different display mode. Therefore in most cases it is enough to try the questionnaire in the end of the implementation on an mobile device. More in the chapter [[:en:create:smartphones]].
+Combined questions, however, do not automatically adjust the layout to the size of the screen (responsive design) - and therefore may not be completed on mobile devices. Here it is suitable to offer an alternative presentation for mobile devices.
+First, create a question of the type "Device and request variables". In the questions in the //Device// tab, put a check mark at //Screen size//. After saving you get two variables for the width and height of the screen in pixels. Note the variable identifier for the screen width, which you can find in the //Variables// tab. In the following example it is assumed that the variable has the identifier "GR01_ScW".
+Now place this question on a page in the questionnaire that comes before the combined question.
+In the following example it is assumed that the variable has the identifier "GR01_ScW". The screen width (unlike the //Format//, which is often not recognized correctly on Apple devices) is not saved until you click "Next".
+Now, with a few lines of [[:en:create:php|PHP code]], you can either display the combined question or display the two questions one below the other (and with optimizations for mobile devices). A width of 600 pixels is chosen as the limit here. Depending on the question types and layout, choosing a larger or smaller number may be appropriate.
+<code php>
+if (value('GR01_ScW') > 600) {
+  // combined question
+  question('AB01','combine=AB02');
+} else {
+  // single questions
+  question('AB01');
+  question('AB02');
+}
+</code>
+For an explanation of the code, please refer to the [[:en:create:php-filters]] tutorial.