I suggest looking at the main Ur/Web demo <http://www.impredicative.com/ur/demo/>, particularly the named demos from Alert to Batch. There's a good chance the code there will clear up all your questions.

On 08/08/2014 01:08 PM, Sergey Mironov wrote:
Presumably the display of inputs includes several widgets associated with
different [source]s.  That is, you must allocate new [source]s for each new
row in the GUI.  The [onclick] code of the button would use [get] to read
the values of these sources and combine them properly.

Is this answer at a good level of detail?
Almost. I've looked into the basis.urs and find that cformTags widgets
may take sources as arguments and are actually designed to be used
without forms. So probably I should use them instead of formTags
equivalent, correct?
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