checkBox

def checkBox = {attrs ->
        attrs.id = attrs.id ? attrs.id : attrs.name
        def value = attrs.remove('value')
        def name = attrs.remove('name')
        def checked = attrs.remove('checked')
        if (checked == null) checked = true
        if (checked instanceof String) checked = Boolean.valueOf(checked)
        if (value == null) value = false
        out << "<input type=\"hidden\" name=\"_${name}\" /><input type=\"checkbox\" name=\"${name}\" "
        if (value && checked) {
            out << 'checked="checked" '
        }
        def outputValue = !(value instanceof Boolean || value?.class == boolean.class)
        if (outputValue)
            out << "value=\"${value}\" "
        // process remaining attributes
        outputAttributes(attrs)
        // close the tag, with no body
        out << ' />'
    }