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sâmbătă, 21 februarie 2015

[OmniFaces utilities (2.0)] Create an editable value expression based on the given EL expr and the given type

[OmniFaces utilities] The createValueExpression() method creates an editable value expression based on the given EL expression and the given type.


You can use this method in many situations. I've used it several times to create the value expressions for composite components. Per example, let's have this composite component usage:

<t:welcomeComponent value="#{welcomeBean.value}" to="#{}"/>

Now, if we add it programmatically, then it will be something like this (the includeCompositeComponent() is another OmniFaces utilities):

import org.omnifaces.util.Faces;
import org.omnifaces.util.Components;
UIComponent parent = Faces.getViewRoot().findComponent("welcomeId");
UIComponent composite = Components.includeCompositeComponent(parent, "customs", "/welcome.xhtml", "welcomeMsgId");

And, further I've set the value expressions for the value and to attributes, as below:

composite.setValueExpression("value", Components.createValueExpression("#{welcomeBean.value}", java.lang.String.class));       
composite.setValueExpression("to", Components.createValueExpression("#{}", java.lang.String.class));       

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