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<p>我正在尝试在Python Dash框架中制作一个应用程序,它允许用户从列表中选择一个名称,并使用该名称填充另外两个输入字段。用户可以在六个位置从(相同)列表中选择名称,因此总共需要执行12次回调。我的问题是,如何使用单个函数定义来提供多个回调</p>
<p>正如我在其他地方看到的(<a href="https://stackoverflow.com/questions/58804477/plotly-dash-table-callback">here for example</a>),人们在执行多个回调时重用相同的函数名,例如</p>
<pre><code>@app.callback(
Output('rp-mon1-health', 'value'),
[Input('rp-mon1-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['health']
else:
return 11
@app.callback(
Output('rp-mon3-health', 'value'),
[Input('rp-mon3-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['health']
else:
return 11
@app.callback(
Output('rp-mon1-health', 'value'),
[Input('rp-mon1-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['health']
else:
return 11
</code></pre>
<p>这是一个相同的重复吨,是坏的,如果有一个修复我需要实现以后。理想情况下,我可以做以下事情:</p>
<pre><code>@app.callback(
Output('rp-mon1-health', 'value'),
[Input('rp-mon1-name', 'value')]
)
@app.callback(
Output('rp-mon2-health', 'value'),
[Input('rp-mon2-name', 'value')]
)
@app.callback(
Output('rp-mon3-health', 'value'),
[Input('rp-mon3-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['health']
else:
return 11
</code></pre>
<p>然而,上述情况在前两种情况下没有回电,只有最后一种情况。我的代码如下</p>
<pre><code>import json
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
monster_data = json.loads('''[{
"name": "Ares Mothership",
"health": 14,
"transition": 2
},{
"name": "Cthugrosh",
"health": 7,
"transition": 3
}]''')
monster_names = [{'label': m['name'], 'value': m['name']} for m in monster_data]
monster_names.append({'label': 'None', 'value': ''})
app = dash.Dash(__name__)
def gen_monster(player, i):
name = 'Monster #%d: ' % i
id_gen = '%s-mon%d' % (player, i)
output = html.Div([
html.Label('%s Name ' % name),
html.Br(),
dcc.Dropdown(
options=monster_names,
value='',
id='%s-name' % id_gen
),
html.Br(),
html.Label('Health'),
html.Br(),
dcc.Input(value=11, type='number', id='%s-health' % id_gen),
html.Br(),
html.Label('Hyper Transition'),
html.Br(),
dcc.Input(value=6, type='number', id='%s-state' % id_gen),
], style={'border': 'dotted 1px black'})
return output
app.layout = html.Div(children=[
html.H1(children='Monsterpocalypse Streaming Stats Manager'),
html.Div([
html.Div([
html.Label('Left Player Name: '),
dcc.Input(value='Mark', type='text', id='lp-name'),
gen_monster('lp', 1),
html.Br(),
gen_monster('lp', 2),
html.Br(),
gen_monster('lp', 3)
], style={'width': '300px'}),
html.Br(),
html.Div([
html.Label('Right Player Name: '),
dcc.Input(value='Benjamin', type='text'),
gen_monster('rp', 1),
html.Br(),
gen_monster('rp', 2),
html.Br(),
gen_monster('rp', 3)
], style={'width': '300px'})
], style={'columnCount': 2}),
html.Div(id='dummy1'),
html.Div(id='dummy2')
])
@app.callback(
Output('rp-mon1-health', 'value'),
[Input('rp-mon1-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['health']
else:
return 11
@app.callback(
Output('rp-mon1-state', 'value'),
[Input('rp-mon1-name', 'value')]
)
def update_health(monster):
if monster != '':
relevant = [m for m in monster_data if m['name'] == monster]
return relevant[0]['transition']
else:
return 6
if __name__ == '__main__':
app.run_server(debug=True)
</code></pre>