Restricting adding electronic signature until certain fields are completed

At first I tried the show/hide in the Sign tab for each field...but I must have done something wrong because the field "showed" after the first activity was signed for

Then I found this code suggestion - placed in a separate text field (hidden) in the Calculate tab - adding in the steps to look at for this particular signing function. (THIS WORKED)... Guess I needed to google just one more time! LOL I am a 'newbie' when it comes to working with code - so the explanaition in the article I found wasn't as clear as I needed at first - but some test-and-try - and I finally got to my desired result. 
I put some 'comments' in to help the next person that finds this...(please edit it if I didn't quite get the explanation correct)

I will do this to the other column of activities that the next department needs to do and I should be ready to go!

var bReady = true;

if(this.getField("ProdSignStep1").value.length == 0)   bReady = false;

[comment: replace "ProdSignStep1..." with the field that you need to have filled in/completed before the last signing field displays. Do this with all fields that need to be filled in before the "last" field displays. Copy this line and change/add/remove as needed for your form data

"False" means nothing is in that field.]

else if(this.getField("ProdSignStep2").value.length == 0)   bReady = false;

else if(this.getField("ProdSignStep3").value.length == 0)   bReady = false;

else if(this.getField("ProdSignStep4").value.length == 0)   bReady = false;

else if(this.getField("ProdSignStep6").value.length == 0)   bReady = false;

else if(this.getField("ProdSignStep8").value.length == 0)   bReady = false;

else if(this.getField("Text30").value.length == 0)   bReady = false;

[comment: So basically all lines above this are checking to see if there is anything in those fields named in the line. It is checking each one each time.]

if(bReady)   this.getField("ProdEndSign").display = display.visible;

[comment: replace "ProdEndSign" with the field that you need to have filled in after all other fields have been filled in]

else   this.getField("ProdEndSign").display = display.hidden;

[comment: These two lines above instruct the form to either show or hide the field named here (ProdEndSign) depending on the results from the checks above)]

Showing/hiding the signature field should work. What have you tried, and what were the results?