variable in class name jade

Question

I can\'t set a variable name in a class in jade:

.flag_#{ session.locale } #{ session.locale }

I have:

Answer 1

Here's another approach:

mixin formButton(text, type, extra_classes)
    - var default_classes = 'btn btn-primary'
    if extra_classes
        - var classes = default_classes + ' ' + extra_classes
    else
        - var classes = default_classes

    if type
        button(class=classes type=type) !{text}
    else
        button(class=classes type="submit") !{text}

Example 1:

Usage:

+formButton('Text')

Result:

Text

Example 2:

Usage:

+formButton('Text', 'button')

Result:

Text

Example 3:

Usage:

+formButton('Text', 'button', 'extra-class')

Result:

Text