Call a Flask function every few minutes

On my HTML page I've got a span that gets the value of the function getStatus():

<span id="sysStatus" style="font-weight: bold;">{{ status }}</span>

The function that returns status:

def getStatus():    state = database().getState()    if state:        status = " On"    else:        status = "Off"    return status

Rendering the html page:

class Tongles(flask.views.MethodView):    def get(self):        return flask.render_template('page.html', status=getStatus())

I would like somehow to dynamically refresh the status of the system, and the text on the span.

How can I recall the function getStatus without reloading the whole page?