How can I set 2 different error messages based on the question requirement with JS?

Hi, I have a drag and drop question with a requirement of selecting 3 items from the list. And I would like to set 2 different error messages,
1)fewer than 3 items are selected
2)more than 3 items are selected
I edit the JS below for the error message of "more than 3 items are selected" condition, may I know how to add another error message for the condition "fewer than 3 items selected"?
Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/

});

Qualtrics.SurveyEngine.addOnReady(function()
{
/*Place your JavaScript here to run when the page is fully displayed*/
jQuery("#"+this.questionId+" .ValidationError").html(" You have selected too many items, please reduce to 3 choices by dragging extra selections out of the box");

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
/*Place your JavaScript here to run when the page is unloaded*/

});