Ever wondered why the following use-when returns true when the variable
"foo" isn't defined?
use-when="foo==null"
This is due to the way beanshell works. When beanshell first encounters
an undefined variable such as "foo", it treats it as a "void". The
"void" type is not considered to be null,
void == null : false
void != null : true
You can see this for yourself with the following script:
print("What is foo? " + foo);
print("Is foo null? " + (foo==null));
print("Is foo void? " + (foo==void));
So the lesson is to keep void in mind when writing a use-when condition.
I added this to the form widget cookbook, which can be found along with
other useful cookbooks here,
http://www.opensourcestrategies.com/ofbiz/tutorials.php- Leon
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