Spawning a new page depending on whether a text field is populated or not

I am trying to create a form that once the last line is in the description field contains text it will automatically spawn a new page directly below the page being filled in. I am so googled out.

if (getField("DOD20").value === "");

{

}

else

var a = this.templates;

  for (i = 0; i < a.length; i++)

  a[i].spawn(this.numPages, false, false);