What Velocity template code can I use to get a list of keys and iterate
over that list, getting the value corresponding to each key? Here is
what I've tried so far:
Before calling Velocity, I place the list of keys plus each key/value
pair in the context. For example:
--
String [] letters = { "a", "b" };
context.put("letters", letters);
context.put("a", "apple");
context.put("b", "blueberry");
--
In the template I have:
--
$a
$b
#foreach ( $letter in $letters )
$letter
${${letter}} ## <-- This is the line in question
#end
--
However, the output is:
--
apple
blueberry
a
${a}
b
${b}
--
The ${a} and ${b} above should be apple and blueberry instead.
What can I use in the line in question to dereference the reference?
Also, is there a better way of accomplishing my goal, which is this?:
I have an app that will have database records of arbitrary type. The
record metadata allows me to get the field names with which to populate
the Velocity context. The record itself has, of course, the data. I
want the Velocity template designer to be able to loop through the
fields in the database record without knowing its format at design time,
as in:
#foreach ($fieldName in $field_names)
<$fieldname>
... ## put the field's value here, as in my vain attempt above
## with ${${fieldname}}
</$fieldname
#end
The data record is not a Java object with named field member variables,
so I can't use the Java Bean approach. Perhaps I could create a class
dynamically at runtime, but I expect this would be overkill.
Thanks for any help you can offer.
- Keith
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