如何将 uirevision 直接添加到 Plotly Dash 中的图形中以实现自动更新

Question

我有一个用 Python 构建的 Plotly 图形，可以自动更新。即使自动更新，我也想保留仪表板缩放。Plotly 中的文档表示，uirevision根据此社区文章，可以使用布局字段来完成此操作。文档给出了返回字典的示例：

 return {
        'data': data,
        'layout': {
            # `uirevsion` is where the magic happens
            # this key is tracked internally by `dcc.Graph`,
            # when it changes from one update to the next,
            # it resets all of the user-driven interactions
            # (like zooming, panning, clicking on legend items).
            # if it remains the same, then that user-driven UI state
            # doesn't change.
            # it can be equal to anything, the important thing is
            # to make sure that it changes when you want to reset the user
            # state.
            #
            # in this example, we *only* want to reset the user UI state
            # when the user has changed their dataset. That is:
            # - if they toggle on or off reference, don't reset the UI state
            # - if they change the color, then don't reset the UI state
            # so, `uirevsion` needs to change when the `dataset` changes:
            # this is easy to program, we'll just set `uirevision` to be the
            # `dataset` value itself.
            #
            # if we wanted the `uirevision` to change when we add the "reference"
            # line, then we could set this to be `'{}{}'.format(dataset, reference)`
            'uirevision': dataset,

            'legend': {'x': 0, 'y': 1}
        }
    }

然而，我的身材更像是这样的：

import plotly.express as px

@app.callback(
    Output("graph", "figure"),
    [Input("interval-component", "n_intervals")])
def display_graph(n_intervals):
    # Logic for obtaining data/processing is not shown
    my_figure = px.line(my_data_frame, x=my_data_frame.index, y=['line_1', 'line_2'], 
    title='Some Title', template='plotly_dark')
    return my_figure

换句话说，由于我不是返回字典，而是直接返回一个绘图表达的图形，那么如何直接访问 uirevision 值以便保留用户的 UI 更改？

Answer 1

您可以使用update_layout图中的成员函数。

my_figure.update_layout(uirevision=<your data>)

更多信息请参见：https://plotly.com/python/creating-and-updating-figures/#updating-figure-layouts

Answer 2

使用图形字典，可以像这样访问：

my_figure['layout']['uirevision'] = 'some_value'

这也可用于访问图形的其他有用方面，例如更改特定行条目的线条颜色：

my_figure['layout']['uirevision'] = 'some_value'

要查看其他条目选项，请my_figure在 Python 会话中打印出来。

注意：由于该uirevision选项没有很好地记录（至少在我的在线搜索中没有），因此我认为值得将其作为选项发布。