Scriptographer.org - How to add existing scripts?

Dear Scriptographer team,

I am trying to use an existing script I have downloaded which calculates the area of the object (http://www.IllustrationETC.com/AIbuds/JET_GetInfoScripts.zip) and I put the .js file in the Scriptographer Scripts folder but it doesn't work, instead it says this:

“TypeError: Cannot read property "length" from undefined
at Scriptographer Scripts/JET_GetArea.js:1”

Could you please take a look at it and tell me how to fix the problem. This is the code of the script.

if ( app.documents.length > 0 && app.activeDocument.selection.length > 0 ) {
var docRef=app.activeDocument;
var pathRef=docRef.selection[0];
var pathRefArea=pathRef.area;

alert ("Square Points: "+Math.round(pathRefArea*100)/100+"\n"
+"Square Picas: "+(Math.round((pathRefArea/144)*100))/100+"\n"
+"Square Inches: "+(Math.round((pathRefArea/5184)*100))/100+"\n"
+"Square Millimeters: "+(Math.round((pathRefArea/8.037)*100))/100+"\n"
+"Square Centimeters: "+(Math.round((pathRefArea/803.520)*100))/100);
}

Thank you in advance, kind regards,
Filip Pomykalo

That script is intended for the ESTK which is not compatible with Scriptographer. Although what you're after is rather easy to do with Scriptographer. Try this out instead:

var selectedItems = document.selectedItems

for(i = 0; i < selectedItems.length; i++){
	var a = selectedItems[i].area
	print('Object ' + (i + 1))
	print('Square Points: ' + (Math.round(a * 100) / 100))
	print('Square Picas: ' + (Math.round((a / 144) * 100) / 100))
	print('Square Inches: ' + (Math.round((a / 5184) * 100) / 100))
	print('Square Millimeters: ' + (Math.round((a / 8.037) * 100) / 100))
	print('Square Centimeters: ' + (Math.round((a / 803.520) * 100)) / 100 + 'n')
}

Good luck!