add support for new histogram event data

[chriddyp]

thanks to plotly/plotly.js#2113

[chriddyp]

Usage

import json
from textwrap import dedent as d
import dash
from dash.dependencies import Input, Output
import dash_core_components as dcc
import dash_html_components as html
import datetime
import pandas as pd

df = pd.read_csv(
    ('https://raw.githubusercontent.com/plotly/'
     'datasets/master/1962_2006_walmart_store_openings.csv'),
    parse_dates=[1, 2],
    infer_datetime_format=True
)
future_indices = df['OPENDATE'] > datetime.datetime(year=2050,month=1,day=1)
df.loc[future_indices, 'OPENDATE'] -= datetime.timedelta(days=365.25*100)

app = dash.Dash(__name__)
app.scripts.config.serve_locally = True
app.css.config.serve_locally = True


styles = {
    'pre': {
        'border': 'thin lightgrey solid',
        'overflowX': 'scroll'
    }
}

app.layout = html.Div([
    dcc.Graph(
        id='basic-interactions',
        figure={
            'data': [
                {
                    'x': df['OPENDATE'],
                    'text': df['STRCITY'],
                    'customdata': df['storenum'],
                    'name': 'Open Date',
                    'type': 'histogram'
                },
                # {
                #     'x': df['date_super'],
                #     'text': df['STRCITY'],
                #     'customdata': df['storenum'],
                #     'name': 'Super Date',
                #     'type': 'histogram'
                # }
            ],
            'layout': {}
        }
    ),

    html.Div(className='row', children=[
        html.Div([
            dcc.Markdown(d("""
                **Hover Data**

                Mouse over values in the graph.
            """)),
            html.Pre(id='hover-data', style=styles['pre'])
        ], className='three columns'),

        html.Div([
            dcc.Markdown(d("""
                **Click Data**

                Click on points in the graph.
            """)),
            html.Pre(id='click-data', style=styles['pre']),
        ], className='three columns'),

        html.Div([
            dcc.Markdown(d("""
                **Selection Data**

                Choose the lasso or rectangle tool in the graph's menu
                bar and then select points in the graph.
            """)),
            html.Pre(id='selected-data', style=styles['pre']),
        ], className='three columns'),

        html.Div([
            dcc.Markdown(d("""
                **Zoom and Relayout Data**

                Click and drag on the graph to zoom or click on the zoom
                buttons in the graph's menu bar.
                Clicking on legend items will also fire
                this event.
            """)),
            html.Pre(id='relayout-data', style=styles['pre']),
        ], className='three columns')
    ])
])


@app.callback(
    Output('hover-data', 'children'),
    [Input('basic-interactions', 'hoverData')])
def display_hover_data(hoverData):
    return json.dumps(hoverData, indent=2)


@app.callback(
    Output('click-data', 'children'),
    [Input('basic-interactions', 'clickData')])
def display_click_data(clickData):
    return json.dumps(clickData, indent=2)


@app.callback(
    Output('selected-data', 'children'),
    [Input('basic-interactions', 'selectedData')])
def display_selected_data(selectedData):
    return json.dumps(selectedData, indent=2)


@app.callback(
    Output('relayout-data', 'children'),
    [Input('basic-interactions', 'relayoutData')])
def display_selected_data(relayoutData):
    return json.dumps(relayoutData, indent=2)


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

[chriddyp]

big thanks to @alexcjohnson for this one 🎉