How to pass a parameter along with h:commandButton

Question

One of the most common approaches to change locale in JSF+Seam - with :

Answer 1

Either pass as method argument (only if your environment supports EL 2.2),

with

public void change(String language) {
    locale = new Locale(language);
    // ...
}

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Or use

with

private String language;

public void change() {
    locale = new Locale(language);
    // ...
}

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Or use

with

public void change() {
    locale = new Locale(FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("language"));
    // ...
}

(you can also let JSF automatically set it by a @ManagedProperty("#{param.language}"), but this requires the bean to be request scoped, or a , see also ViewParam vs @ManagedProperty(value = "#{param.id}"))

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Enough ways to pass a parameter from view to controller. Take your pick. The serves in JSF context a somewhat different purpose and it can only be manipulated by JavaScript in the onclick which is ugly.