boolean getAnswerMissing()
The function getAnswerMissing() can be used to determine whether a page is repeatedly displayed because a response was missing, or because the specified format was not adhered to. This function can be used, for example, to display additional information.
Tip: If you run a customized response check, input a text element ID in the command repeatPage to show this as an error message.
The following PHP code displays the text element “infoAB01” if the page is redisplayed due to a missing or incorrect response (e.g. in question AB01).
if (getAnswerMissing()) { text('infoAB01'); } question('AB01');