How to compare two currency form fields and display a message if the fields do not equal?

Question

My form has 2 fields named Total_1 and Total_2. If one of the fields does not equal the other, a hidden field will display a message in red on the form alerting the user. Otherwise, the message does not display. Looks like a validation script but I would greatly appreciate help in getting it started. Any ideas?
Thanks, Charlie
charlie6067

Answer 1

Since the field values that you want to compare are the results of calculations, you should not normally compare their string values, but rather their numeric values when rounded appropriately (and perhaps then converted to a string). For example, if you have two values that display as 3.14, one could be 3.1400000001 and the other could be 3.13999999999991234. When you get the field values as strings and compare them, they won't be equal though they appear to be. Even some values that are numerically identical won't be equal when compared as strings ("0.0" != "0.00") So the code could be changed to:
// Get the two field values, rounded to two decimals
var v1 = util.printf("%.2f", getField("Total_1").value);
var v2 = util.printf("%.2f", getField("Total_2").value);
// Hide/Show the error message
event.value = (v1 === v2 || (+v1 === 0 && +v2 === 0)) ? "" : "Error message here.";