Acrobat Form Fill – Document Closing Validation

Question

Can someone help me with this. I want to set a form field empty validation in set document actions when a document closes. Basically wanting some entry level custom data validation.
For example Form has 20 fields, I want 3 of them say name1, occupation1 and age1 to produce a JavaScript alert if they are empty.
So if all three are empty it will say
Please complete Name, occupation and age fields
If only name is empty it will then only say
Please complete name field
Can someone point me to or list the javascript code on how to do this? At the moment I am just using a general app.alert type reminder when the document closes.Trying to smarten things up a bit.

Answer 1

I see. You can use this code, then. I made a slight change to the format of the error message to make it easier to generate:
var fields = ["name1", "occupation1", "age1"]; // The actual field names
var descriptions = ["Name", "Occupation", "Age"]; // The user-friendly names for these fields
var missingFields = [];
for (var i in fields) {
    if (this.getField(fields[i]).valueAsString=="") {
        missingFields.push(descriptions[i]);
if (missingFields.length!=0) {
    app.alert("Please complete the following fields: " + missingFields.join(", "), 1);