Question

我有一个日期选择器护林员，它选择2个日期并返回日期范围之间的文件名表。现在，我想添加一个下载按钮来下载所有已返回的文件。我不确定如何添加下载所有功能帮助。我已经创建了显示特定范围内的所有文件的第一部分，但是添加按钮是我的不足之处。

def generate_table(dataframe, max_rows):
return html.Table(
    # Header
    [html.Tr([html.Th(col) for col in dataframe.columns])] +

    # Body
    [html.Tr(html.A([html.Td(dataframe.iloc[i][col]) for col in dataframe.columns], 
                 href=link+dataframe.iloc[i][0])) 
    for i in range(min(len(dataframe), max_rows))] + [html.Button('Download All', id='button-1')]
)



def convert_to_date(dates):
    dates = dates.replace("-", "")
    dates = datetime.datetime.strptime(dates, '%Y%m%d').date()
    return dates


external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
app.config['suppress_callback_exceptions']=True

app.layout = html.Div(children=[

    html.H4(children='Select a date'),


    dcc.DatePickerRange(
        id='my-date-picker-range',
        min_date_allowed=dt(1995, 1, 1),
        max_date_allowed=dt(2030, 12, 30),
        initial_visible_month=dt.now(),
        with_portal=True,
        display_format='Do MMM, YYYY',

    ),




    html.Div(id='table-container'),
    html.Ul(id='container')

 ])


@app.callback(
    dash.dependencies.Output('table-container', 'children'),
    [dash.dependencies.Input('my-date-picker-range', 'start_date'),
     dash.dependencies.Input('my-date-picker-range', 'end_date')])


def files_in_range(start_date, end_date):
    dt = df['Date']
    DT = []
    s = 'advsot_'
    e = '.xlsx'


    if start_date is not None and end_date is not None:
         start_date = convert_to_date(start_date)

         end_date = convert_to_date(end_date)

         for i in dt:
            if start_date <= i <= end_date:
               DT.append(s+'{:%Y%m%d}'.format(i)+e)

         DT = pd.DataFrame(DT, columns = ['Filename'])

         return generate_table(DT, max_rows)




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

使用Plotly Dash创建全部下载按钮

0 个答案: