禁用“提交"按钮在Python + Dash中持续30秒 [英] Disable "Submit" button for 30 seconds in Python + Dash

问题描述

在用户在下面的脚本中按下提交"按钮30秒后，我想让其停止.我将如何去做呢?这是我的代码当前的外观:

I want to stop the user from pressing the "Submit" button for 30 seconds, after they have pushed it in the script below. How would I go about doing this? This is how my code looks currently:

import dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div([
    dcc.Input(id='my-id', value='initial value', type="text"),
    html.Button('Submit', id='button'),
    html.Div(id='my-div')
])

@app.callback(
    Output(component_id='my-div', component_property='children'),
    [Input('button', 'n_clicks')],
    state=[State(component_id='my-id', component_property='value')]
)
def update_output_div(n_clicks, input_value):
    return 'You\'ve entered "{}" and clicked {} times'.format(input_value, n_clicks)

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

有人知道我如何阻止用户按下按钮30秒钟吗?

Does anyone know how I can stop users from pushing the button for 30 seconds?

先谢谢.

编辑格林尼治标准时间2018年8月15日9:30对stevepastelan的响应:

import dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div([
    dcc.Input(id='my-id', value='initial value', type="text"),
    html.Button('Submit', id='button'),
    html.Div([dcc.Interval(
        id='interval-component',
        interval=1 * 3000,  # in milliseconds
        n_intervals=0
)]),
    html.Div(id='my-div')
])

@app.callback(
    Output(component_id='my-div', component_property='children'),
    [Input('button', 'n_clicks')], [Input('interval-component', 'n_intervals')],
    state=[State(component_id='my-id', component_property='value')]
)
def update_output_div(n_clicks,n_intervals, input_value):
    return 'You\'ve entered "{}" and clicked {} times'.format(input_value, n_clicks)

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

编辑15/08/2018 16:22 PM通过编辑后的回叫编写简单脚本，但没有用:

import dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div([
    dcc.Input(id='my-id', value='initial value', type="text"),
    html.Button('Submit', id='button'),
    html.Div([dcc.Interval(
        id='interval-component',
        interval=1 * 3000,  # in milliseconds
        n_intervals=0
)]),
    html.Div(id='my-div')
])

@app.callback(
    Output(component_id='my-div', component_property='children'),
    [Input('button', 'n_clicks')], [Input('interval-component', 'n_intervals')],
    state=[State(component_id='my-id', component_property='value')]
)

def update_output_div(n_clicks,n_intervals, input_value):
    return 'You\'ve entered "{}" and clicked {} times'.format(input_value, n_clicks)

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

推荐答案

更新的答案

好的，我设法实现了自己的建议，但它并不琐碎，但仍然存在怪癖.

Updated answer

Okay, I managed to implement my own suggestion, but it was not trivial and still has quirks.

复杂因素是:

• Dash不允许两个回调以相同的Output
为目标
• 没有很好的方法来跟踪哪个Input或Event触发了您的回调.解决方法通常涉及跟踪每个按钮的点击次数(请参见 https://github. com/plotly/dash-html-components/pull/37 ).
• 通过disable=True或max_requests=0禁用计时器似乎是永久性的.一旦以这种方式停止计时器，就无法使用disable=False或max_requests=1000重新启动它.

• Dash does not permit two callbacks to target the same Output
• There is no good way to track which Input or Event triggered your callback. Workarounds generally involve tracking the number of clicks per button (see https://github.com/plotly/dash-html-components/pull/37 as an example).
• Disabling a timer via disable=True or max_requests=0 appears to be permanent. Once I stopped a timer in this way, I could not restart it with either disable=False or max_requests=1000.

问题:

• 在此解决方案中，update_output_div()被调用两次-但是您可以通过测量到上一次计数的按钮单击次数来区分两者，从而可以防止两次提交数据.
• 小于100毫秒的超时将不起作用.我必须拆分延迟计时器才能使方法起作用，因此我选择了100和(1000 * BUTTON_PRESS_LOCKOUT_SECONDS)-100作为两个计时器持续时间.原则上，您可以将它们平均分配一半.我不知道通过网络工作时使用低超时是否有任何问题(我在本地主机上进行了测试).

• In this solution, update_output_div() gets called twice -- but you can tell the difference between the two by measuring the number of button clicks to the previous count, so you can keep it from submitting your data twice.
• Timeouts of less than 100ms won't work. I had to split the delay timer for my method to work, so I chose 100 and (1000 * BUTTON_PRESS_LOCKOUT_SECONDS)-100 as the two timer durations. In principle, you could split them evenly half and half. I don't know if there are any problems with using a low timeout when working over the network (I did my testing on localhost).

灵感来自:

• https://community.plot .ly/t/how-to-to-off-off-interval-event/5565/3
• https://github.com/plotly/dash -recipes/blob/master/toggle-interval.py

• https://community.plot.ly/t/how-to-turn-off-interval-event/5565/3
• https://github.com/plotly/dash-recipes/blob/master/toggle-interval.py

import json
import datetime

import dash
from dash.dependencies import Input, Output, State, Event
import dash_core_components as dcc
import dash_html_components as html

BUTTON_PRESS_LOCKOUT_SECONDS = 10  # seconds

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

def serve_layout():
    return html.Div([
        dcc.Input(id='my-id', value='initial value', type="text"),
        html.Button('Submit', id='button'),
        html.Div(
              [
                  dcc.Interval(id='interval-component', disabled=True)
                , dcc.Interval(id='interval-sync-component', disabled=True)
              ]
            , id='interval-container'
        ),
        html.Div("", id='my-div'),
        html.Div(json.dumps({'n_clicks':0, 'n_previous_clicks':0}), id='local_data'),
        html.Div('??', id='button-status'),
    ])

app.layout = serve_layout

# Track button clicks
@app.callback(
    output=Output(component_id='local_data', component_property='children'),
    inputs=[Input('button', 'n_clicks')],
    state=[State('local_data', 'children')],
    events=[Event('interval-sync-component', 'interval')]
)
def track_clicks(n_clicks, local_data_json):
    if n_clicks is None:
        n_clicks = 0

    local_data = json.loads(local_data_json)
    n_previous_clicks = local_data['n_clicks']

    # Update local data with the new click data
    local_data.update(**{'n_clicks': n_clicks, 'n_previous_clicks': n_previous_clicks})
    # local_data.update(**{'n_clicks': n_clicks, 'n_previous_clicks': n_previous_clicks})
    return json.dumps(local_data)


# When the button click count is updated, submit
@app.callback(
    output=Output(component_id='my-div', component_property='children'),
    inputs=[Input('local_data', 'children')],
    state=[State(component_id='my-id', component_property='value'), State('my-div', 'children')]
)
def update_output_div(local_data_json, input_value, current_state):
    local_data = json.loads(local_data_json)
    n_clicks = local_data['n_clicks']
    n_previous_clicks = local_data['n_previous_clicks']

    # Real submit
    if n_clicks > n_previous_clicks:
        return 'You\'ve entered "{}" and clicked {} times ({})'.format(
              input_value
            , n_clicks if n_clicks is not None else 0
            , datetime.datetime.now()
        )

    # Not a real submit, but function is called an extra time as a side effect of the timer nonsense below.
    else:
        return '*' + current_state


# Start (or stop) the timer
@app.callback(
    output=Output('interval-container', 'children'),
    inputs=[Input('local_data', 'children')],
    state=[State('button', 'disabled')],
    events=[Event('interval-component', 'interval')]
)
def start_timer(local_data_json, button_is_disabled):
    local_data = json.loads(local_data_json)
    n_clicks = local_data['n_clicks']
    n_previous_clicks = local_data['n_previous_clicks']

    children=[]

    if n_clicks > n_previous_clicks:
        sync_timer = dcc.Interval(
            id='interval-sync-component',
            interval=100,  # in milliseconds
        )
        children.append(sync_timer)

    if button_is_disabled:
        main_timer = dcc.Interval(
            id='interval-component',
            interval=(1000 * BUTTON_PRESS_LOCKOUT_SECONDS)-100,  # in milliseconds
        )
        children.append(main_timer)

    return children


# Enable the button whenever the timer interval is triggered or disable it when the button is pressed
@app.callback(
    output=Output('button', 'disabled'),
    inputs=[Input('button', 'n_clicks')],
    state=[State('local_data', 'children')],
    events=[Event('interval-component', 'interval')]
)
def toggle_button_disabled_state(n_clicks, local_data_json):
    local_data = json.loads(local_data_json)
    # n_clicks = local_data['n_clicks']
    if n_clicks is None:
        n_clicks = 0
    n_previous_clicks = local_data['n_previous_clicks']

    # We got here via button click, so disable the button
    if n_clicks > n_previous_clicks:
        return True

    # We got here via timer expiration, so enable the button
    else:
        return False  # enable the button

# Report on the button status
@app.callback(
    output=Output('button-status', 'children'),
    inputs=[Input('button', 'disabled')]
)
def update_button_status(disabled):
    if disabled:
        return 'Disabled submit button for {} seconds'.format(BUTTON_PRESS_LOCKOUT_SECONDS)
    else:
        return 'Submit button enabled'


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

原始答案

您可以使用dash_core_components.Interval在计时器的基础上触发要在页面上执行的操作.这里有一些示例: https://dash.plot.ly/live-updates

Original answer

You can trigger actions to be taken on the page based on a timer using dash_core_components.Interval. There are some examples here: https://dash.plot.ly/live-updates

您可以使用n_intervals = 0初始化间隔组件，然后使自己的提交"按钮禁用并设置n_intervals = 1.然后在重新启用按钮的间隔上编写一个回调.

You could initialize your interval component with n_intervals = 0, and then make your submit button disable itself and set n_intervals = 1. Then write a callback on the interval that re-enables the button.

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