Passing localized javascript messages from resource bundles using JSF

Question

I have built an application with JSF and all messages issued by the server are localized with resource bundles.

My question is: how to get messages issued in the cli

Answer 1

the wutzebaer answer is right but it has a problem when then the variables of a literal has any dot, like "person.name"

<script type="text/javascript">
    var msg = new Object();
    <c:forEach items="#{msg.keySet()}" var="key">
    try{ 
        //msgTempl.#{key} = "#{msg[key]}";
        msg['#{key}'] = "#{msg[key]}";  //works better than msgTempl.#{key} = "#{msg[key]}"; when the key contains dots like 'fields.name'
    }catch(e){ 
        console.log("error fullfilling the msgForms resource from bundle " +e);
    }
    </c:forEach>
</script>  

that worked for me, but the netbeans shows this error:

Error: The prefix "c" for the "c: forEach" element is not linked.

cause it had put a JSTL tag insida a script, but it works fine, however

also there is another way to do it

@ManagedBean(name = "ResouceBundle")
@ApplicationScoped
public class ResouceBundle implements Serializable {

    private static final long serialVersionUID = 1L; //needed because the bean is application|session|view and it needs to be Serializable
    public String msg;

    @PostConstruct
    public void init() {
        this.msg = createResourceBundleJSON("resourceName");
    }

    public String createResourceBundleJSON(String resourceName) {

        FacesContext context = FacesContext.getCurrentInstance();
        ResourceBundle bundle = context.getApplication().getResourceBundle(context, resourceName);
        JSONObject jsonObj = new JSONObject();
        Set<String> keys = bundle.keySet();
        for (String key : keys) {
            jsonObj.put(key, JSONObject.wrap(bundle.getString(key)));
        }
        return jsonObj.toString(); 
    }

    public String getMsg() {
        return msg;
    }

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

}

and then, in the XHTML, just write:

<script type="text/javascript">   
    var msg =  #{ResouceBundle.msg}
</script>

Answer 2

Just let JSF print the desired JS code. E.g.

<script>
    var message = "#{bundle['some.key']}";
</script>

You only need to take JS special characters such as singlequotes and newlines into account. For that, you could register a custom EL function which delegates to Apache Commons Lang StringEscapeUtils, or use OmniFaces of:escapeJS() function.

Answer 3

if you want to provide all keys use something like that in yout main-template etc.

<script type="text/javascript">
    var msg = new Object();
    <c:forEach items="#{msg.keySet()}" var="key">
        msg.#{key} = "#{msg[key]}";
    </c:forEach>
</script>