How to set node attribute dynamically using NodeBuilder pattern in groovy

How do I set a dynamic node attribute based on a condition in groovy when using the NodeBuilder pattern?

Like the following

def b = DOMBuilder.开发者_如何学CnewInstance()
b.div ( attribute: "value") {
    if (condition) {
        // Set div.dynamicAttribute to true here
    }

}

Preferably it would be nice to reference the current element in the conditional statement since the condition might appear deep down in the structure.

---

The easiest way to do this is to evaluate the condition for the dynamic attribute outside the node closure. For Example:

if (condition) {
    b.div(attribute: "value", dynamicAttribute: true) {
        ...
    }
} else {
    b.div(attribute: "value") {
        ...
    }
}

Alternatively, you can create a map of the attributes beforehand:

def attributes = [attribute: "value"]
if (condition) {
    attributes['dynamicAttribute'] = true
}
b.div(attributes) {
    ...
}