Questions - introduction/18/en

From LimeSurvey Manual

You may also use JavaScript to achieve further question customization. First, you have to allow JavaScript to be used when setting up questions. This can be achieved by deactivating the XSS filter from the global settings of your LimeSurvey installation. However, deactivating this option is not always a good idea - read the following wiki section for further information. Question tailoring via JavaScript: