如何使用回调更新函数内的数据表？

Question

大家好，我尝试更新应用程序中的数据table 数据，这些数据是从这样的 display() 函数初始化的，但是数据 table 没有更新，但是如果没有初始化应用程序一个display()但是直接在里面写div，数据table更新了，如果我声明[=13]有没有办法使用回调更新数据table数据=] 函数内部 ?

import dash
import dash_html_components as html
import dash_core_components as dcc
import dash_table as dt
from dash.dependencies import Input, Output
import pandas as pd

df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/solar.csv')

app = dash.Dash(__name__)



states = df.State.unique().tolist()

app.layout = display()

@app.callback(
    Output('table-container', 'data'),
    [Input('filter_dropdown', 'value') ] )
def display_table(state):
    dff = df[df.State==state]
    return dff.to_dict("records")

display()

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

def display() :
   return html.Div(
    children=[
    dcc.Dropdown(
            id='filter_dropdown',
            options=[{'label':st, 'value':st} for st in states],
            value = states[0]
            ),
    dt.DataTable(id='table-container') ]
    )```

Answer 1

在布局上设置初始数据看起来可以实现您的需要：

import dash
import dash_html_components as html
import dash_core_components as dcc
import dash_table as dt
from dash.dependencies import Input, Output
import pandas as pd


df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/solar.csv')
app = dash.Dash(__name__)

states = df.State.unique().tolist()

@app.callback(Output('table-container', 'data'),
              [Input('filter_dropdown', 'value') ])
def display_table(state):
    dff = df[df.State==state]
    return dff.to_dict("records")


def display() :
   return html.Div(
    children=[
    dcc.Dropdown(
            id='filter_dropdown',
            options=[{'label':st, 'value':st} for st in states],
            value = states[0]
            ),
    dt.DataTable(
        id='table-container',
        columns=[{"name": i, "id": i} for i in df.columns],
        data=df.to_dict('records')
        )]
    )


app.layout = display()


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

如何使用回调更新函数内的数据表？

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