Default value to be hidden

Use this code in jS onReady function. The below code will make text entry N/A if its empty, for all text entry input on that page.
jQuery("#NextButton").on('click',function(){

jQuery(".InputText").each(function(){
if(jQuery(this).val().trim()==""){jQuery(this).val("N/A");}
});

});

@rondev Thanks for the jQuery. I will apply it.
I have another question.
Regards to Required Field (Force Response), is there anyway to customize it to all questions together instead of getting a generic message "Please answer this question."?
I am trying to say "Please answer this question. If you do not have an answer, please indicate N/A" on all questions together.
Thanks.

I have another question.:
Here is the code:
jQuery(".ValidationError").html("Please answer this question. If you do not have an answer, please indicate N/A");