Passing string parameter to a function or method from xhtml

Question

I have a button that I'd like to render based on whether a function returns true or false.

The HTML:

<p:commandButton type="button" rendered="#{myBean.checkPermission(1)}" value="Create"  />

And the supporting bean:

public boolean checkPermission(String actionKey) {
...
}

The problem is that when I call checkPermission with a numeric parameter like

#{myBean.checkPermission(1)},

it works fine, but with I pass a String as a parameter, i.e.

#{myBean.checkPermission(ABC)}

, I get an empty string passed. Any idea why?

Luiggi Mendoza · Accepted Answer · 2012-11-20 02:10:57Z

8

You're not passing a String, instead an ABC variable that can't be understood by EL and your method will receive null value (thanks to BalusC for correct me). You should add apostrophes (') to tell the framework you're passing a String:

<p:commandButton type="button" rendered="#{myBean.checkPermission('ABC')}"
    value="Create" />

edited Nov 20, 2012 at 2:10

answered Nov 20, 2012 at 0:19

Luiggi Mendoza

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1 Comment

BalusC Over a year ago

It's more specifically EL which didn't understood it. The variable #{ABC} didn't exist in the EL scope and evaluates to null. This is beyond JSF's control.

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