Re: Flow Basic Java language help

[Geoff Howard]

JD Daniels wrote:

I think I need some help with something more basic than I realize...

The idea here is that my form has checkboxes named tickets[]
When flow gets it, the toString() gives me 2,5,6 or what ever the values
are.
basically this function will build the IN sql clause (I know this is very
hacky, but I am against a noon-type deadline)
The problem is I can't seem to check if it is null (No boxes checked)
without a nullpointer exception. Which seems really irritating.. I want to
TEST if it is null.
I don't see an attempt at a null check below - perhaps you took it out? 
 But without seeing it, are you certain you did "== null" or "!=null" 
instead of (assignment) "= null"?  Also, I presume you tested tickets 
right after var tickets = cocoon.request.get("tickets[]"); and not after 
the attempt to call toArray() (which would be too late).

var tickets = cocoon.request.get("tickets[]");
if (tickets == null) {
        // Handle no tickets here
}
Throws an NPE?  If so, what is the stacktrace?

Geoff

Same thing to check if it contains a _single_ item. I have a try/catch to
find the nullpointer... but of course when it has a single item it catches
it too.
So in short:

How do I test if tickets has no elements?
How do I check if tickets has one element to skip the for block?
Help :S



function do()
{
        var tickets = cocoon.request.get("tickets[]");
        try{
                        var s = "tickets.id IN (";
			tickets = tickets.toArray();

                    for (var i = 0; i < tickets.length; i++) {
                                tickets[i] = "'" + tickets[i] + "'";
                                if (i != "0")
                                {
                                        s = s + "," + tickets[i];
                                }
                                else
                                {
                                        s = s + tickets[i];
                                }
                    }
                        var s = s + ")";
                        print(s);
                        cocoon.request.setAttribute("sql", s);
                        cocoon.sendPage("postInvoice.xsp");
        }
        catch(Exception)
        {
                print("Exception Occured");
                cocoon.sendPage("fail.xml",{error: "Please Select Some Tickets."});
        }
}
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