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Re-using Dash components

Your Dashboards are gaining traction, especially your recent date picker app. A senior manager loved it but requested some updates: use the corporately styled logo and display it in multiple places.

To keep your code clean, it's time to create a reusable Python function for the logo.

The approved logo style is: 'width':'75px', 'margin':'20px 20px 5px 5px', 'border':'1px dashed lightblue', 'display':'inline-block'

Cet exercice fait partie du cours

Building Dashboards with Dash and Plotly

Afficher le cours

Instructions

  • Create a reusable component function called add_logo() below line 11 to return the corp_logo component.
  • Inside this function, create a Dash image element called corp_logo using the appropriate HTML component with the provided style below line 13.
  • Call the add_logo() function in each of the 4 marked spots below lines 20, 27, 30, and 46.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

from dash import Dash, dcc, html, Input, Output, callback
import plotly.express as px
import pandas as pd
from datetime import datetime, date
ecom_sales = pd.read_csv('/usr/local/share/datasets/ecom_sales.csv')
logo_link = 'https://assets.datacamp.com/production/repositories/5893/datasets/fdbe0accd2581a0c505dab4b29ebb66cf72a1803/e-comlogo.png'
ecom_sales['InvoiceDate'] = pd.to_datetime(ecom_sales['InvoiceDate'])

app = Dash()

# Create a reusable component function called add_logo
____ ____():
    # Create a Dash image element
    corp_logo = ____(
        src=logo_link, 
        style={'width':'75px', 'margin':'20px 20px 5px 5px', 'border':'1px dashed lightblue', 'display':'inline-block'})
    return corp_logo

app.layout = [
  # Insert the logo (1)
  ____,
  html.Br(),
  html.H1('Sales breakdowns'),
  html.Br(),
  html.Br(),
  html.Div([
        # Insert the logo (2)
        ____,
        html.H2('Controls', style={'margin':'0 10px','display':'inline-block'}),
        # Insert the logo (3)
        ____,
        html.H3('Sale Date Select'),
        html.Br(),
        dcc.DatePickerSingle(
            id='sale_date',
            min_date_allowed=ecom_sales.InvoiceDate.min(),
            max_date_allowed=ecom_sales.InvoiceDate.max(),
            initial_visible_month=date(2011, 4, 1),
            date=date(2011, 4, 11),
            style={'width':'200px', 'margin':'0 auto'})],   
        style={'width':'350px', 'height':'350px', 'display':'inline-block', 'vertical-align':'top', 'border':'1px solid black', 'padding':'20px'}),
  html.Div([
            dcc.Graph(id='sales_cat'),
            html.H2('Daily Sales by Major Category', style={'border':'2px solid black', 'width':'400px', 'margin':'0 auto'})],
            style={'width':'700px','display':'inline-block'}),
  # Insert the logo (4)
  ____
]
@callback(
    Output(component_id='sales_cat', component_property='figure'),
    Input(component_id='sale_date', component_property='date')
)
def update_plot(input_date):
    sales = ecom_sales.copy(deep=True)
    if input_date:
        sales = sales[sales['InvoiceDate'] == input_date]
    ecom_bar_major_cat = sales.groupby('Major Category')['OrderValue'].agg('sum').reset_index(name='Total Sales ($)')
    bar_fig_major_cat = px.bar(
        title=f'Sales on: {input_date}',data_frame=ecom_bar_major_cat, orientation='h', 
        x='Total Sales ($)', y='Major Category')
    return bar_fig_major_cat

if __name__ == '__main__':
    app.run(debug=True)
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