Is it possible to access a bean variable in jsf?

[prakash ke]

Hi,

I want to access a string variable from a managed bean and compare it another value and thereby render a table only if they are equal.


Can anyone help me on this?

[Tim Holloway]

JSF is all about accessing bean variables, as long as they are presented as JavaBean properties.

There are several ways to do this. One is by brute-force EL:

<h:dataTable id="tbl1" rendered="#{ctlBean.showMe eq 'yup'}" ...

Another way is to present the rendering logic as a property itself:

<h:dataTable id="tbl1" rendered="#{ctlBean.renderTable}" ...

public boolean renderTable() {
    boolean render = this.showMe.equals("yup");
    return render;
}

This is recommended for more complex logic and/or where you want to reduce the coupling between Model and View. Which also is more in the spirit of MVC, as it puts the logic in code instead of in the View definition. Actually, the UI controlling code is technically part of the Controller feature, but JSF's controller features are a bit different than the traditional arrangement.

Note that JSF's injection feature means that the "showMe" property on ctlBean can be injected as a Managed Property from some other managed bean.