jsf - f:convertNumber doesn't throw conversion error on trailing alphabetic characters in decimal -

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i using <f:convertnumber> tag convert decimal input.

<f:convertnumber minfractiondigits="2" />

but it's accepting trailing alphabatic characters. example, if input 12345.1234aaa converts 12345.123. throw conversion error on instead of trimming alphabetic characters. how can achieve this?

this standard behavior of java.text.numberformat used <f:convertnumber>: trims entries after first not-allowed character (e.g. letters or decimal separators others ones defined in input locale). conversion fails if offending character @ beginning.

i don't behaviour because user may not notice mis-typed value got trimmed, resulting in unintended , (even worse) unnoticed auto-correction wrong value.

interestingly enough, specific number converters behave differently. using <f:converter converterid="javax.faces.double" /> not automatically handle non-numerical input, fails conversion instead. however, tag not possess additional attributes of convertnumber, such minfractiondigits or currency symbols.

a different approach write own custom converter extends standard converter described in answer. check value characters , directly abort further processing (throwing according conversion exception) if find any. if value character-free call standard behavior of converter derive from.

the drawback of both ways loose additional capabilities of convertnumber. not have attributes such minfractiondigits or currencysymbol on <f:converter>, if need you'd have find way pass in parameter. our implementation not require of these, haven't looked further (we went approach a), this answer presents approach so.


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