Variable not being reflected (not being binded) in footer bar

When we type text in input box, it can reflect in paragraph within ion-content. But outside the ion-content it doesn’t get reflected. For example, footer bar is outside the ion-content. So, input variable is not being reflected in footer bar. Does anyone know how to bind the variable outside the scope of ion-content?

Codepen: http://codepen.io/anon/pen/xmEJl