Calling messages.properties dynamically with controller model variable and Thymeleaf

Question

I have my messages.properties like this:

tablas.menu.paises=Pa\u00EDses
tablas.menu.regiones=Regiones
tablas.menu.anhos=A\u00F1os
tablas.menu.universidades=Universidades
tablas.menu.usuarios=Usuarios

In the .html I have a menu showing each item with th:each:

<li class="nav-item" th:each="menu : ${menus}">
  <a th:text="#{tablas.menu.${menu.nombre}}"></a>
</li>

For each "menu in ${menus}", menu.nombre has the values paises, regiones, anhos... But thymeleaf doesn't recognise the model variable inside the #{}, and this it is giving me in the view the error when it doesn't find the message:

??tablas.menu.${menu.nombre}_es_ES??

Configuration is ok, if I change the call for #{tablas.menu.regiones} I get 'regiones' and so. Is there any way to call a message from messages.properties dynamically using a model variable like this?

Thanks.

Try the Thymeleaf preprocessor. So, for example: _${menu.nombre}_. — andrewJames
– andrewJames, Commented Apr 10, 2020 at 18:24
Damn thank you so much, I didn't know that feature and it works. th:text="#{tablas.menu.__${menu.nombre}__}" is working perfect. — Jorge Cámara
– Jorge Cámara, Commented Apr 10, 2020 at 18:37
And thank you for correcting my typo - double underscores are needed, not singles. — andrewJames
– andrewJames, Commented Apr 10, 2020 at 19:11

Metroids · Accepted Answer · 2020-04-13 19:21:06Z

2

You can use the #messages utility object for this:

<a th:text="${#messages.msg('tablas.menu.' + menu.nombre)}" />

Or you can create the string using literal substitution:

<a th:text="#{|tablas.menu.${menu.nombre}|}" />

I would recommend using preprocessing only as a last resort, as bad values can cause runtime errors. (Although they do work for this.)

answered Apr 13, 2020 at 19:21

Metroids

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