content: import dash
  from dash import html, Input, Output, callback
  
  
  dash.register_page(__name__, id="page1")
  
  layout = html.Div(
      [
          html.Div("text for page1", id="text_page1"),
          html.Button("goto page2", id="btn1", n_clicks=0),
      ]
  )
  
  
  @callback(Output("url", "pathname"), Input("btn1", "n_clicks"))
  def update(n):
      if n > 0:
          return "/page2"
      return dash.no_update
  