How can I check if a Resource Bundle contains a specific key in a JSF page

Question

I have a JSF page which has a bundle loaded. However I need to dynamiclly build a key to access the property. What I need to do is check that the property exists so I can decide whether to render the or not.

I have tried checking if the value is empty but it always renders the output.

Thanks

by empty you mean an empty String or null ? – Redlab Jun 14 '10 at 15:55 — Redlab, Jun 14 '10 at 15:55

Bozho · Answer 1 · 2010-06-18T13:05:22.590

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You can write a custom JSTL / Facelets function that takes two arguments - the bundle and the key, and verifies whether the key is contained. Something like:

value="#{cust:containsKey(msg, key) ? msg[key] : 'default'}"

edited Jun 18 '10 at 13:05

answered Jun 14 '10 at 15:49

Bozho

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Speedstone · Answer 2 · 2018-09-06T07:22:21.350

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It's usually a plain Resourcebundle object, so you can use its method:

<h:panelGroup rendered="#{res.containsKey('myKey')}">...

edited Sep 06 '18 at 07:22

answered Sep 21 '16 at 13:14

Speedstone

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Note that EL 2.2 wasn't commonly available at the date this question was asked. Before EL 2.2 was introduced, this line would throw an [EL syntax error](http://stackoverflow.com/questions/5273729/how-to-call-a-method-with-a-parameter-in-jsf). – BalusC Sep 21 '16 at 14:20

How can I check if a Resource Bundle contains a specific key in a JSF page

2 Answers2