title: Calculations in acrobat
body: <p>I want to calculate a value entered in one field with a set amount - my coding is below but it returns a value of NaN</p>
  
  <pre><code>if (this.getField("Qty FP_NW").value &gt;= 1) {
     event.value = ("Qty FP_NW" * "$454.25") ;
  } else {
     event.value = " " ;
  }
  </code></pre>
  
  <p>Do I need to set up a text field for the $454.25 value?</p>