Dynamically adding a button to a table

Question

Hi everybody. What I'm trying to do is to render (or to set visible) a button in a table depending on a property value.
I've created a boolean property on a page bean and defined the get method like this:
private boolean existente;
* Getter para propiedad existente.
* @return Valor de la propiedad existente.
public boolean isExistente() {       
try {
TableRowDataProvider rowdata = (TableRowDataProvider) getBean("currentRow");
String value = (String) rowdata.getValue("ContactoCargo.idContactoCargo");
getContactoRowSet().setObject(1, value);
getContactoRowSet().execute();
if(getContactoRowSet().size()>0)
return existente = false;
else
return existente = true;
} catch (Exception e) {
error(e.getMessage());
return false;
Then I bind the rendered (or the visible) property to the "existente" property, and in the properties window it looks like #{Page1.existente}.
The thing is that when I deploy, no button is rendered nor visible. And when I try to debug it, it seems that it never executes the "isExistente()" function, it doesn't stop there.
Any idea in how to do this?
I've already done it with check buttons and it worked fine, binding the "selected" property.
Any help would be really apreciated. Thanks.

Answer 1

Can you not use the Disabled property on the Button, and call isDisabled() in your code?
f you need to create your own page bean boolean property, it is recommended that this be done via the IDE. That way the Get and Set methods are automatically generated and you app is automatically aware of the properties' existence. From the Online Help:
Creating a Bean Property
To create a Bean property for a managed bean:
In the Projects window, right-click the node for the managed bean. You can select the Session Bean, Request Bean, or Application Bean node.
For example, to add a property to a Request Bean, right-click the project-name > Request Bean node.
From the pop-up menu, choose Add > Property or Add > Indexed Property.
Either the New Property Pattern dialog box or the New Indexed Pattern dialog box appears, enabling you to customize the code to be generated for the property.
Click OK to generate the property and the property's methods for the selected managed bean.
To see the nodes added for the property in the Projects window, expand the class under the node, and then expand the Fields node to see the property itself and expand the Methods node to see the methods created for the property. For example, for the Request Bean, expand project-name > Request Bean > RequestBean1 > Methods to see the methods added for the new property.
To create a Bean property for a generic bean:
In the Projects window, find the class for your bean, expand its node, and right-click Bean Patterns.
From the pop-up menu, choose Add > Property or Add > Indexed Property.
Either the New Property Pattern dialog box or the New Indexed Pattern dialog box appears, enabling you to customize the code to be generated for the property.
Click OK to generate the component property methods for the selected class.