Adobe 65036570 Scripting Guide - Page 67

ADOBE DIRECTOR 11.0 30 Scripting Dictionary mySum = addThem(3+6, 8>2) In Lingo, each handler begins with the word on followed by the message that the handler should respond to. The last line of the handler is the word end. You can repeat the handler's name after end, but this is optional. In JavaScript syntax, each handler begins with the word function followed by the message that the handler should respond to. The statements that make up the handler are surrounded by opening and closing brackets, as are all JavaScript syntax functions. Returning results from handlers Often, you want a handler to report some condition or the result of some action. Return results from a handler Use the keyword return to have a handler report a condition or the result of an action. For example, the following findColor handler returns the current color of sprite 1: -- Lingo syntax on findColor return sprite(1).foreColor end // JavaScript syntax function findColor() { return(sprite(1).foreColor); } You can also use the keyword return by itself to exit from the current handler and return no value. For example, the following jump handler returns nothing if the aVal parameter equals 5; otherwise, it returns a value: -- Lingo syntax on jump(aVal) if aVal = 5 then return aVal = aVal + 10 return aVal end // JavaScript syntax function jump(aVal) { if(aVal == 5) { return; } else { aVal = aVal + 10; return(aVal); } } When you define a handler that returns a result, you must use parentheses after the handler when you call it from another handler. For example, the statement put(findColor()) calls the on findColor handler and then displays the result in the Message window.