如何从.jsf页面adf 12c中的函数获取返回值？

Question

I am calling a function on page load (.jsf page programmatically) and it's working fine, but function is returning (0 or 1) string value. I want to show or hide buttons based on returning value in jsf page.

How can I get returning value on .jsf page?

How can I apply logic of show and hide based on returning value?

Here is how I am calling function on page load

<f:metadata>
        <?audit suppress oracle.ide.xml.validation-error?>
        <f:event type="preRenderView" listener="#{backingBeanScope.backing_login.viewPrivilidge('Program')}"/>
</f:metadata>

Here is the code of button on which i want to apply logic

 <af:button text="Supplier" id="b4" inlineStyle="width:190px;"
            destination="Supplier_Setup.jsf" icon="#{resource['images:supplier.png']}"/> 

I am using .jsf page in adf 12c.

Answer 1

Be careful with the use of Rendered. Rendered = false prevents any markup from being generated for that component. That means you can't simply set rendered = true on the component and expect it to appear - it won't. In this case you have to refresh a containing layout manager to get it to render. You probably want Visible=false here, then the markup is generated for the component and setting visible = true will make the component appear.

Rendered is often reserved for secure components where you do't want the markup in the page source at all.

Answer 2

only you need to call function in render attribute of that tag where you want to apply logic

<af:button text="Supplier" id="b4" inlineStyle="width:190px;"
            rendered="#{backingBeanScope.backing_login.viewPrivilidge('Program') == '1'}"           destination="Supplier_Setup.jsf" icon="#{resource['images:supplier.png']}"/> 

"#{backingBeanScope.backing_login.viewPrivilidge('Program') == '1'}" .......... if your returning value is equal to '1' then it will render otherwise it will not render