JavaScript fix when pre-filling check boxes from a previous question

Question

I have 2 multiple response questions - X1 and X2. Both use the same list which consists of 10 options.

If I select options 1-5-10 at X1, X2 should display all 10 options but have the check boxes ticked for 1-5-10. I can do this with a series of if statements, but had trouble converting it to a for loop format.

I know the line "  if('[%X1%]_'+i==1)" is my problem.

<script>
$(document).ready(function(){
 for(var i=1; i<=10; i++)
  {
  if('[%X1%]_'+i==1)
   {
     SSI_SetSelect('[%QuestionName()%]_'+i, true);
   }
  }
})
</script>

Appreciate any guidance. Thanks.

Comments

You need to read in all the values from the database before going into the loop.  The simplest way would be something like this:

var x1Resps = [[% X1_1 %], [% X1_2 %], [% X1_3 %], ...];

If you don't want to write out a bunch of calls, though, this will do the same thing:

var x1Resps = [% Begin Unverified Perl
my @resps = ();
for (my $i = 1; $i <= 10; $i++) {
    push(@resps, GETVALUE('X1_' . $i));
}
return '[' . join(',', @resps) . ']';
End Unverified %]

Either way, "x1Resps" is now an array of all the X1 responses and you can pull out whichever one you want in your loop.

---

Thanks Zachary for pointing me in the right direction. I tried both methods which worked. Once you had me capturing X1 within an array, I was able to call upon that array within my for loop. Much appreciated as always buddy.

My script now looks like this ...

<script>
$(document).ready(function(){

 var x1Resps=[[%X1_1%], [%X1_2%], [%X1_3%], [%X1_4%], [%X1_5%], [%X1_6%], [%X1_7%], [%X1_8%], [%X1_9%], [%X1_10%],];

 for(var i=1; i<=10; i++)
  {
  if(x1Resps[i-1]==1)
   {
     SSI_SetSelect('[%QuestionName()%]_'+i, true);
   }
  }
})
</script>

---

Nice final solution.  I had been watching for the response here as I couldn't wrap my head around it.  Makes sense now.

---

Yeh Jay, I knew what I initially did would not work. The piping in of all 10 variables from X1 wasn't correct when I tried to use a for loop format. I had it working just fine with a series of if statements.

But Zachary the wizard guided me in to storing the 10 variables in to an array and operating the loop off that. Then I was up and running ...

I tested both of Zachary's array solutions out which worked fine.

---

Yeah, I was able to go through the script and make sense of it, but I have not personally done anything with arrays.  It took me a minute and then I understood the '-1' as they always start with 0 as I recall.

---

Yes correct. The arrays start at index "0", hence the reason I popped in the -1 to align with the for loop counter.