Using objGlobal to pass optional parameters
Extending the idea in the previous section slightly, you can introduce the concept of optional parameters being passed into scripts. In a script that needs to pass some optional parameters into another script you might find code like this:
objGlobal.OptParms = new Object(); objGlobal.OptParms.CustNumber = "12345"; objGlobal.OptParms.CustName = "ACME ENGINEERING"; NAVIGATE_TO_SCREEN("uShowCustomer");
and the script that receives the optional parameters you would find code possibly structured something like this:
var CustNumber = "some default value"; var CustName = "some default value"; if (objGlobal.OptParms != null) { CustNumber = objGlobal.OptParms.CustNumber; CustName = objGlobal.OptParms.CustName; objGlobal.OptParms = null; } /* Now we proceed to use the values in CustNumber and CustName */
The line objGlobal.OptParms = null; line is very important to this style of processing because it destroys the temporary OptParms object.
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