Hiding Fields at PDF Open

Instead of using the event object, you will need to access the field directly, like so:

var f = this.getField("txtVicePresidentSignature");
f.hidden = (this.getField("txtCost").value < 1001);etc.

When a PDF opens, there are some events that get automatically processed by the JavaScirpt interpretor, the document level scripts and the page open action. So you could place the code with the full field reference in the Document Level scripts. You should also keep the validation script. You could even create a function for this action that could be used by both the initialization and validation actions.

[url=http://www.acrobatusers.com/tutorials/2007/07/js_document_scripts]Entering Document Scripts[/url] by Thom Parker.

Thanks guys for the quick responses...

But it still doesn't seem to be working.

Here's the new script (based on Try67's response):

function Init()
{
var f = this.getField("txtVicePresidentSignature");
f.hidden = (this.getField("txtCost").value < 1001);
var f = this.getField("txtVicePresidentSignatureDate");
f.hidden = (this.getField("txtCost").value < 1001);
var f = this.getField("cmbVicePresident");
f.hidden = (this.getField("txtCost").value < 1001);
var f = this.getField("txtPresidentSignature");
f.hidden = (this.getField("txtCost").value < 5001);
var f = this.getField("txtPresidentSignatureDate");
f.hidden = (this.getField("txtCost").value < 5001);
}

And I put it in the Document Level scripts (as per Gkaseril's post).

Not sure if this matters, but the Signature and Date fields are initially hidden (under field properties), and should only be shown if the value in txtCost is > 1000 and > 5000.
But this is working on the field validation level.

Either call init() or take the code out of the function, or it won't run.

So its case-sensitive then?

Yes, but that was just a mistake on my part.
The point is that code inside a function won't be executed unless the function is called.
So in this case:

Init()
function Init() {
...
}

Ahhh... gotcha. I'll try that, thanks.

I would have written the document level code as:

The validation script for the the "txtCost"field would then be:
FieldDisplay(event.value);