英文:
How to make a callback function that draws a graph with a python dash button works
问题
我想在按下Python Dash按钮时绘制一个图表。
所以我创建了一个名为btn-run的按钮和一个名为btn_run_click的回调函数。
然而，当按下按钮时，不会绘制新的图表。下面是附加的代码。
有人可以帮忙吗？
import dash
from dash import Dash, dcc, html, Input, Output
import plotly.express as px
import pandas as pd
app = dash.Dash(__name__)
app.layout = html.Div([
html.Br(),
html.Button('start', id='btn-run', n_clicks=0,
style={'width':'150px','height':'30px'}),
dcc.Graph(id='main-plot', figure={}),
html.Br()
])
@app.callback(
Output('main-plot', 'children'),
Input('btn-run','n_clicks')
)
def btn_run_click(btn_run):
if btn_run == 0 : return
df = pd.DataFrame({
"Fruits":['Apples', 'Oranges', 'Bananas'],
"Amount":[4,3,6]
})
fig = px.bar(df, x="Fruits", y="Amount", barmode='group')
return dcc.Graph(figure=fig)
if __name__ == '__main__':
app.run_server(debug=False, port=8052)
希望这能帮助您解决问题。
英文:
I want to draw a graph when I press the python dash button.
So I created a button called btn-run and a callback function called btn_run_click.
However, a new plot is not drawn when the button is pressed. The code is attached below.
Is there someone who can help?
import dash
from dash import Dash, dcc, html, Input, Output
import plotly.express as px
import pandas as pd
app = dash.Dash(__name__)
app.layout = html.Div([
html.Br(),
html.Button('start', id='btn-run', n_clicks=0,
style={'width':'150px','height':'30px'}),
dcc.Graph(id='main-plot', figure={}),
html.Br()
])
@app.callback(
Output('main-plot', 'children'),
Input('btn-run','n_clicks')
)
def btn_run_click(btn_run):
if btn_run == 0 : return
df = pd.DataFrame({
"Fruits":['Apples', 'Oranges', 'Bananas'],
"Amount":[4,3,6]
})
fig = px.bar(df, x = "Fruits", y = "Amount", barmode='group')
return dcc.Graph(figure=fig)
if __name__ == '__main__':
app.run_server(debug=False, port=8052)
答案1
得分: 0
我对你的代码做了一些次要的更改。
import dash
from dash import Dash, dcc, html, Input, Output
import plotly.express as px
import pandas as pd
app = dash.Dash(__name__)
app.layout = html.Div([
html.Br(),
html.Button('开始', id='btn-run', n_clicks=0,
style={'width': '150px', 'height': '30px'}),
dcc.Graph(id='main-plot', figure={}),
html.Br()
])
@app.callback(
# 将输出更改为 main-plot.figure
Output('main-plot', 'figure'),
Input('btn-run', 'n_clicks')
)
def btn_run_click(btn_run):
#if btn_run == 0: return
df = pd.DataFrame({
"水果": ['苹果', '橙子', '香蕉'],
"数量": [4, 3+btn_run, 6]
})
fig = px.bar(df, x="水果", y="数量", barmode='group')
# 只返回图形
return fig
if __name__ == '__main__':
app.run_server(debug=False, port=8052)
英文:
i made some minor changes to your code
import dash
from dash import Dash, dcc, html, Input, Output
import plotly.express as px
import pandas as pd
app = dash.Dash(__name__)
app.layout = html.Div([
html.Br(),
html.Button('start', id='btn-run', n_clicks=0,
style={'width': '150px', 'height': '30px'}),
dcc.Graph(id='main-plot', figure={}),
html.Br()
])
@app.callback(
# change output to main-plot.figure
Output('main-plot', 'figure'),
Input('btn-run', 'n_clicks')
)
def btn_run_click(btn_run):
#if btn_run == 0: return
df = pd.DataFrame({
"Fruits": ['Apples', 'Oranges', 'Bananas'],
"Amount": [4, 3+btn_run, 6]
})
fig = px.bar(df, x="Fruits", y="Amount", barmode='group')
# just return the figure
return fig
if __name__ == '__main__':
app.run_server(debug=False, port=8052)
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