dynamic render?

[J Miller]

I'm trying to display or not display a <rich:toolTip> based on whether or not there is anything in the value field. A coworker at told me they believe there is something I can do similar to this:

<rich:toolTip value="#{bean.toolTip}" rendered="value.isEmpty()" />

That isn't the correct syntax, but it just conveys my idea. If you have a rich:toolTip where the value="", then it shows up as an empty box. So I only want it rendered if there's something in there. The idea is that the "value.isEmpty()" would return a true/false boolean based on whether or not #{bean.toolTip} returns anything.

Anybody got any idea if/how this can be accomplished?

Thanks!

[leo donahue]

Define the rendered value as an instance field and provide getters/setters.

    private boolean empty;
    public boolean isEmpty() {
        return empty;
    }

    public void setEmpty(boolean empty) {
        this.empty = empty;
    }

You'll have to update the value of empty in your bean.toolTip method.

Then you can use: rendered="#{bean.isEmpty}"

[Tim Holloway]

Actually, the EL provides an easier way:

<rich:toolTip value="#{bean.toolTip}" rendered="#{not empty bean.toolTip}" />  

The "empty" EL operator returns true if the argument is null or an empty string.