DataTable with custom click behaviour?

Hi,

I’m plotting two different data-sets in a figure, but displaying a combined (concatenated) data-set in the DataTable that follows the figure.

Is it still possible to control the focus of the plotted glyph once an item is clicked in the DataTable. Obviously, they are different sources (I’m aware that if the data sources were to be the same, this behaviour comes by default), so maybe through a custom JS behaviour and some kind of ID matchings?

Here is my example code:

from bokeh.plotting import figure, show
from bokeh.io import output_notebook
from bokeh.models import ColumnDataSource, HoverTool, DatetimeTickFormatter, Legend, LegendItem, DateFormatter, StringFormatter, DataTable, TableColumn
from bokeh.layouts import row, column, layout
import pandas as pd

output_notebook()

ask_start_time = [
    '2022-02-06 15:04:54+00:00',
    '2022-02-06 18:27:34+00:00',
    '2022-02-06 18:30:34+00:00',
    '2022-02-07 15:00:24+00:00',
    '2022-02-08 01:34:14+00:00',
    '2022-02-08 02:42:14+00:00']

ask_end_time = [
    '2022-02-07 15:04:54+00:00',
    '2022-02-07 18:27:34+00:00',
    '2022-02-07 18:30:34+00:00',
    '2022-02-08 15:00:24+00:00',
    '2022-02-09 01:34:14+00:00',
    '2022-02-09 02:42:14+00:00']

ask_price = [17, 20, 19, 22, 25, 23]
ask_tag = ['ask', 'ask', 'ask', 'ask', 'ask', 'ask']

prep_ask_data = {
    "start_time": ask_start_time,
    "end_time": ask_end_time,
    "price": ask_price,
    "side": ask_tag
}

bid_start_time = [
    '2022-02-05 11:24:34+00:00',
    '2022-02-05 16:47:14+00:00',
    '2022-02-06 14:35:34+00:00',
    '2022-02-07 21:30:24+00:00',
    '2022-02-09 04:24:14+00:00',
    '2022-02-09 07:12:14+00:00']

bid_end_time = [
    '2022-02-05 14:24:34+00:00',
    '2022-02-05 20:47:14+00:00',
    '2022-02-06 19:35:34+00:00',
    '2022-02-07 22:30:24+00:00',
    '2022-02-09 08:24:14+00:00',
    '2022-02-09 09:12:14+00:00']

bid_price = [11, 9, 13, 16, 5, 7]
bid_tag = ['bid', 'bid', 'bid', 'bid', 'bid', 'bid']

prep_bid_data = {
    "start_time": bid_start_time,
    "end_time": bid_end_time,
    "price": bid_price,
    "side": bid_tag
}

df_asks = pd.DataFrame(prep_ask_data)
df_bids = pd.DataFrame(prep_bid_data)

df_asks['start_time'] = pd.to_datetime(df['start_time'])
df_asks['end_time'] = pd.to_datetime(df['end_time'])
df_bids['start_time'] = pd.to_datetime(df['start_time'])
df_bids['end_time'] = pd.to_datetime(df['end_time'])

# Combine
df_all_orders = pd.concat([df_asks, df_bids], ignore_index=True)
df_all_orders.sort_values(by='start_time', inplace=True)


source_asks = ColumnDataSource(df_asks)
source_bids = ColumnDataSource(df_bids)
source_combined = ColumnDataSource(df_all_orders)

my_tooltips = [
    ('start_time', '@start_time{%F %T}'),
    ('end_time', '@end_time{%F %T}')
]

hover_tool = HoverTool(
        tooltips=my_tooltips,
        formatters={
            '@start_time': 'datetime',
            '@end_time': 'datetime'
            }
        )
tools = [hover_tool]


p = figure(
    x_axis_type = 'datetime',
    height=200,
    width=400,
    tools=tools
)

ask_line = p.segment(
        x0='start_time',
        y0='price',
        x1='end_time',
        y1='price',
        line_width=3,
        line_cap='round',
        line_dash='solid',
        line_color='red',
        source=source_asks
)

bid_line = p.segment(
        x0='start_time',
        y0='price',
        x1='end_time',
        y1='price',
        line_width=3,
        line_cap='round',
        line_dash='solid',
        line_color='green',
        source=source_bids
)

legend = Legend(items=[
        LegendItem(label="Asks", renderers=[ask_line]),
        LegendItem(label="Bids", renderers=[bid_line])],
    location="center",
    orientation="horizontal",
    glyph_height=20,
    glyph_width=20,
    label_standoff=2,
    label_text_font_size='8px',
    click_policy='hide',
    border_line_width=2,
    margin=2,
    padding=2,
    spacing=10,
    background_fill_color="#fcf5e3"
)

column_datetime_formatter = DateFormatter(
        format="%e %b %Y - %H:%M:%S",
        text_color='black'
)

columns = [
        TableColumn(field='start_time', title="Start Time", width=560, formatter=column_datetime_formatter),
        TableColumn(field='end_time', title="End Time", width=560, formatter=column_datetime_formatter),
        TableColumn(field='price', width=100, title="Price", formatter=StringFormatter(text_color='black')),
        TableColumn(field='side', width=200, title="Side", formatter=StringFormatter(text_color='black'))
]

order_table = DataTable(
        source=source_combined, columns=columns, editable=False, width=400, height=200, index_position=0, index_header="index", index_width=30
)


p.add_layout(legend, "above")

dashboard_layout = layout([
    [p],[order_table]
])

show(dashboard_layout)

Or maybe someone can point me to the mechanics behind the DataTable where when you click on a row, it fades everything out and just leaves the clicked element focused.

I might try and do some JS thing that matches an ID of the row item, to the ID in the plot and fades everything out, but the matched item.

@mbilyanov when you click on a row, it sets a value for selection.indices on the associated data source, i.e. it behaves exactly the same as clicking on a glyph. So if you have some mapping between the indices of one CDS and the other, you can use a CustomJS for selection, and set the necessary selection indices on the data source for the other glyph. All the selection/non-selection highlighting derives from the selection indices, regardless of whether the selection indices were set by a tool or by code (e.g. in a CustomJS)

Hi,
Here is my solution to this problem, in case someone else needs it in the futures. Also, anyone who thinks this could be done in a better way, please share your thoughts. Especially, on the JS side, I don’t think things are done efficiently on that front.

Also, if you guys have a better solution for …

target_source_bids.selected.indices = [999];

… where, basically I need to have a non-existent index selected to fade all the renderers in the opposite group, for cases where 1 item is selected from one side, and so all layers on the opposite side needs to be faded.

from bokeh.plotting import figure, show
from bokeh.io import output_notebook
from bokeh.models import ColumnDataSource, HoverTool, DatetimeTickFormatter, Legend, LegendItem, DateFormatter, StringFormatter, DataTable, TableColumn
from bokeh.layouts import row, column, layout
from bokeh.models import CustomJS, Switch
import pandas as pd

output_notebook()

ask_start_time = [
    '2022-02-06 15:04:54+00:00',
    '2022-02-06 18:27:34+00:00',
    '2022-02-06 18:30:34+00:00',
    '2022-02-07 15:00:24+00:00',
    '2022-02-08 01:34:14+00:00',
    '2022-02-08 02:42:14+00:00']

ask_end_time = [
    '2022-02-07 15:04:54+00:00',
    '2022-02-07 18:27:34+00:00',
    '2022-02-07 18:30:34+00:00',
    '2022-02-08 15:00:24+00:00',
    '2022-02-09 01:34:14+00:00',
    '2022-02-09 02:42:14+00:00']

ask_price = [17, 20, 19, 22, 25, 23]
ask_tag = ['ask', 'ask', 'ask', 'ask', 'ask', 'ask']
ask_id = ['1001', '1002', '1003', '1004', '1005', '1006']

prep_ask_data = {
    "start_time": ask_start_time,
    "end_time": ask_end_time,
    "price": ask_price,
    "side": ask_tag,
    "id": ask_id
}

bid_start_time = [
    '2022-02-05 11:24:34+00:00',
    '2022-02-05 16:47:14+00:00',
    '2022-02-06 14:35:34+00:00',
    '2022-02-07 21:30:24+00:00',
    '2022-02-09 04:24:14+00:00',
    '2022-02-09 07:12:14+00:00']

bid_end_time = [
    '2022-02-05 14:24:34+00:00',
    '2022-02-05 20:47:14+00:00',
    '2022-02-06 19:35:34+00:00',
    '2022-02-07 22:30:24+00:00',
    '2022-02-09 08:24:14+00:00',
    '2022-02-09 09:12:14+00:00']

bid_price = [11, 9, 13, 16, 5, 7]
bid_tag = ['bid', 'bid', 'bid', 'bid', 'bid', 'bid']
bid_id = ['1007', '1008', '1009', '1010', '1011', '1012']

prep_bid_data = {
    "start_time": bid_start_time,
    "end_time": bid_end_time,
    "price": bid_price,
    "side": bid_tag,
    "id": bid_id
}

df_asks = pd.DataFrame(prep_ask_data)
df_bids = pd.DataFrame(prep_bid_data)

df_asks['start_time'] = pd.to_datetime(df_asks['start_time'])
df_asks['end_time'] = pd.to_datetime(df_asks['end_time'])
df_bids['start_time'] = pd.to_datetime(df_bids['start_time'])
df_bids['end_time'] = pd.to_datetime(df_bids['end_time'])

# Combine
df_all_orders = pd.concat([df_asks, df_bids], ignore_index=True)
df_all_orders.sort_values(by='start_time', inplace=True)

source_asks = ColumnDataSource(df_asks)
source_bids = ColumnDataSource(df_bids)
source_combined = ColumnDataSource(df_all_orders)

my_tooltips = [
    ('start_time', '@start_time{%F %T}'),
    ('end_time', '@end_time{%F %T}')
]

hover_tool = HoverTool(
        tooltips=my_tooltips,
        formatters={
            '@start_time': 'datetime',
            '@end_time': 'datetime'
            }
        )
tools = [hover_tool]

p = figure(
    x_axis_type = 'datetime',
    height=200,
    width=400,
    tools=tools
)

ask_line = p.segment(
        x0='start_time',
        y0='price',
        x1='end_time',
        y1='price',
        line_width=3,
        line_cap='round',
        line_dash='solid',
        line_color='red',
        source=source_asks
)

bid_line = p.segment(
        x0='start_time',
        y0='price',
        x1='end_time',
        y1='price',
        line_width=3,
        line_cap='round',
        line_dash='solid',
        line_color='green',
        source=source_bids
)

legend = Legend(items=[
        LegendItem(label="Asks", renderers=[ask_line]),
        LegendItem(label="Bids", renderers=[bid_line])],
    location="center",
    orientation="horizontal",
    glyph_height=20,
    glyph_width=20,
    label_standoff=2,
    label_text_font_size='8px',
    click_policy='hide',
    border_line_width=2,
    margin=2,
    padding=2,
    spacing=10,
    background_fill_color="#fcf5e3"
)

column_datetime_formatter = DateFormatter(
        format="%e %b %Y - %H:%M:%S",
        text_color='black'
)

columns = [
        TableColumn(field='start_time', title="Start Time", width=560, formatter=column_datetime_formatter),
        TableColumn(field='end_time', title="End Time", width=560, formatter=column_datetime_formatter),
        TableColumn(field='price', width=100, title="Price", formatter=StringFormatter(text_color='black')),
        TableColumn(field='side', width=200, title="Side", formatter=StringFormatter(text_color='black'))
]

order_table = DataTable(
        source=source_combined, columns=columns, editable=False, width=400, height=200, index_position=0, index_header="index", index_width=30
)

callback = CustomJS(args=dict(caller_source=source_combined, target_source_bids=source_bids, target_source_asks=source_asks), code="""
    // "index" here is the number of the row you clicked in the table.
    var selected_items = cb_obj.indices
    
    //console.log(selected_items)
    
    let selection_groups = []
    
    for (var i = 0; i < selected_items.length; i++) {
        let lookup_index = selected_items[i];
        //console.log('= ' + lookup_index + ' =');
        let source_side = caller_source.data.side[lookup_index];
        //console.log('= ' + source_side + ' =');
        let source_id = caller_source.data.id[lookup_index];
        //console.log('= ' + source_id + ' =');
        selection_groups.push([source_id, source_side])
    }
    
    let target_indices_asks = []
    let target_indices_bids = []
    
    //console.log(selection_groups)
    // The format here is [[id, side] ...]
    // So for example, an array that looks like this: [[1001, 'ask'], [1009, 'bid'], ...]
    for (var i = 0; i < selection_groups.length; i++) {
        let current_id = selection_groups[i][0];
        let current_side = selection_groups[i][1];
        
        let target_source;
        if(current_side=='ask'){
            let target_index = target_source_asks.data.id.indexOf(current_id)
            console.log('Using <' + current_id + ':' + current_side + '>, found index <' + target_index + '>')
            if(target_index != -1){
                target_indices_asks.push(target_index)
            }
        }else{
            let target_index = target_source_bids.data.id.indexOf(current_id)
            console.log('Using <' + current_id + ':' + current_side + '>, found index <' + target_index + '>')
            if(target_index != -1){
                target_indices_bids.push(target_index)
            }
        }
    }
    
    console.log('GROUP(s) used: ' + selection_groups + ' ASK_INDICES found: ' + target_indices_asks + ' BID_INDICES found: ' + target_indices_bids)
    
    if (target_indices_asks.length > 0) {
        target_source_asks.selected.indices = target_indices_asks;
        console.log('-A-');
        // Disable others if there are no selections in that group.
        if (target_indices_bids.length == 0) {
            console.log('-B-');
            target_source_bids.selected.indices = [999];
        }
    }
    
    if (target_indices_bids.length > 0) {
        target_source_bids.selected.indices = target_indices_bids;
        console.log('-C-');
        // Disable others if there are no selections in the opposite group.
        if (target_indices_asks.length == 0) {
            console.log('-D-');
            target_source_asks.selected.indices = [999];
        }
    }
    
     if (target_indices_asks.length == 0 && target_indices_bids.length == 0) {
         target_source_asks.selected.indices = [];
         target_source_bids.selected.indices = [];
     }
""")

source_combined.selected.js_on_change('indices', callback)

p.add_layout(legend, "above")

dashboard_layout = layout([
    [p],[order_table]
])

show(dashboard_layout)

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