Update index.py

index.py

@@ -3,17 +3,32 @@ from app import app
 
 server = app.server
 
-def serve_content():
-    """
-    :return: html div component
-    """
-    return html.Div([
-        dcc.Location(id='url', refresh=False),
-        html.Div(id='page-content')
-    ])
+# def serve_content():
+    # """
+    # :return: html div component
+    # """
+    # return html.Div([
+    #     dcc.Location(id='url', refresh=False),
+    #     html.Div(id='page-content')
+    # ])
 
 
-app.layout = serve_content()
+# app.layout = serve_content()
+
+app.layout = html.Div([
+    html.H1(children='Title of Dash App', style={'textAlign':'center'}),
+    dcc.Dropdown(df.country.unique(), 'Canada', id='dropdown-selection'),
+    dcc.Graph(id='graph-content')
+])
+
+@callback(
+    Output('graph-content', 'figure'),
+    Input('dropdown-selection', 'value')
+)
+def update_graph(value):
+    dff = df[df.country==value]
+    return px.line(dff, x='year', y='pop')
+
 
 if __name__ == '__main__':
     app.run_server(debug=True)