How do I make previous buttons disappear on selected questions?

Question

I am trying to have the previous button not show up on selected questions. I have tried two custom java scripts (see below), but if the question is answered incorrectly on the page with the java script (i.e. the error message appears), the previous button reappears and you can go back.

I am aware of the solution of dividing it into blocks and using branches, however the survey is quite extensive and this would require 50+ additional blocks and branches in an already complicated flow. The other option is of course to remove them completely but this makes other parts of the survey difficult.

Is there a way to do this with custom script so that the previous button stays hidden even when the question is answered incorrectly?

Java Scripts I tried (when loading, when displayed, when unloading):

$('PreviousButton').hide();
$('PreviousButton').disable();

OR

{
    $('PreviousButton').hide();
});

Anonymous · Accepted Answer

Hello @ASFriesacher ,Paste the below code in the js(onReady) of the question     if(jQuery(".ValidationError").text()==""){                 jQuery("#PreviousButton").hide();     }else{             jQuery("#PreviousButton").css("visibility","collapse");    }

TomG · Answer

This appears to be a timing issue introduced by a recent Qualtrics change (I also notice that hiding Separators in the addOnload function no longer works either due to a timing issue).  Deferring the PreviousButton hide until the stack clears works:```Qualtrics.SurveyEngine.addOnReady(function() {     setTimeout(function() { jQuery("#PreviousButton").hide(); },0);});```

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