Normally messages from message properties are fetched via, key i.e. message code, What if we want to select more than one message property, like a list. To get a list of select message codes from message.properties, we need to customize messageSource bean. To do that, lets create a class ‘CustomisedPluginAwareResourceBundleMessageSource’ which should extend class ‘PluginAwareResourceBundleMessageSource’.
To fetch all properties we will use getMergedProperties().
import org.codehaus.groovy.grails.context.support.PluginAwareResourceBundleMessageSource
class CustomisedPluginAwareResourceBundleMessageSource extends PluginAwareResourceBundleMessageSource {
List listMessageCodes(Locale locale, String lookupMessageCode) {
Properties properties = getMergedProperties(locale).properties
List listOfCodes = []
properties.each {
if (it.key.toString().matches(/^[\w.]*${lookupMessageCode}[.\w]*$/))
listOfCodes.add(it.key)
}
return listOfCodes
}
}
Here, ‘listMessageCodes()’ takes two parameters, first is the ‘locale’ we are looking in and second is ‘string’ which we are searching for ; and it returns the list of codes which contains that string.
Next we need to do is re-define ‘messageSource’ bean in the resources file:
import com.ig.demoApp.CustomisedPluginAwareResourceBundleMessageSource
beans = {
messageSource(CustomisedPluginAwareResourceBundleMessageSource) {
basenames = "WEB-INF/grails-app/i18n/messages"
}
}
That’s it!
All we need to do is call the method ‘listMessageCodes()’. Here is a small example.
Mentioned below is a sample of message codes, in message.properties:
fruit.orange.label=Orange fruit.black.label=Black Grape fruit.red.label=Red Apple fruit.green.label=Green Apple square.black.label=Black Square square.yellow.label=yellow Square square.red.label=Pink Square circle.violet.label=Violet Circle circle.magenta.label=Magenta Circle circle.olive.label=Olive Circle
and a controller like:
package demoapp
class DemoController {
def messageSource
def show() {
[fruits: messageSource.listMessageCodes(request.locale, "fruit"),
squares: messageSource.listMessageCodes(request.locale, "square"),
circles: messageSource.listMessageCodes(request.locale, "circle"),
blackColorItems:messageSource.listMessageCodes(request.locale, "black"),
redColorItems:messageSource.listMessageCodes(request.locale, "red")]
}
}
a gsp:
<g:form>
<p>Available Fruits</p>
<g:each in="${fruits}" var="fruit">
<span>
<input type="radio" name="fruit">
<label><g:message code="${fruit}"/></label>
</span>
</g:each>
<p>Available Squares</p>
<g:each in="${squares}" var="square">
<span>
<input type="radio" name="square">
<label><g:message code="${square}"/></label>
</span>
</g:each>
<p>Available Circles</p>
<g:each in="${circles}" var="circle">
<span>
<input type="radio" name="circle">
<label><g:message code="${circle}"/></label>
</span>
</g:each>
<p>Available Black Color Items</p>
<g:each in="${blackColorItems}" var="blackColorItem">
<span>
<input type="radio" name="blackColorItem">
<label><g:message code="${blackColorItem}"/></label>
</span>
</g:each>
<p>Available Red Color Items</p>
<g:each in="${redColorItems}" var="redColorItem">
<span>
<input type="radio" name="redColorItem">
<label><g:message code="${redColorItem}"/></label>
</span>
</g:each>
</g:form>
That’s it :)
- You can also find the demo here.
