Cannot filter Whiskers

Hi there,

I am having a problem with using Whiskers for error bars on my data points. I have a lot of data and I want users to be able to filter it. However the Whiskers are remaining when I am filtering my data and I cannot find any documentation about how to use filters (CDSView) or anything else to help remove them.

I would rather like to avoid rebuilding my ColumnDataSource every time a user filters the data.

This is an example:

Assuming the dots are related to the whiskers in this example, if I uncheck a box a dot disappears.

I would like for both of the related whiskers to also disappear, I did have images for both of these steps but could not post them as I am a new user.

Here is the code for the demo:

from bokeh.layouts import layout
from bokeh.models import ColumnDataSource, OpenHead, Plot, Range1d, Whisker, CDSView, CheckboxGroup, CustomJS
from bokeh.models.filters import CustomJSFilter
from bokeh.plotting import figure, show

x_range = Range1d(0, 10)
y_range = Range1d(0, 10)

# Have to specify x/y range as labels aren't included in the plot area solver
plot = figure(plot_width=600, plot_height=600,
            x_range=x_range, y_range=y_range, toolbar_location=None)

# Data source
source = ColumnDataSource(data=dict(
    x1 = [1,3,5,7,9],
    lower1 = [1,2,1,2,1],
    upper1 = [2,3,2,3,2],
))

# Setup widget
labels= [str(x) for x in source.data.get('x1')]
checkbox_class = CheckboxGroup(
    labels=labels,
    active=list(range(len(labels))),
    sizing_mode="stretch_width"
)

# Widget callback arguments
arg_dict = dict (
    filter_source=source,
    classes = checkbox_class
)

# Create filter for all widgets
widget_filters = CustomJSFilter(args = arg_dict,
                                code =
"""
    let active_classes = classes.active.map(i=>classes.labels[i]);
    let class_column = filter_source.data.x1;
    let indices = [];

    // Check if there are filters that match the data
    for (let i=0; i<class_column.length; i++) {
        if(active_classes.includes(class_column[i].toString())){
            indices.push(i);
        }
    }
    return indices;
""")

# Watch for changes to user input fields
checkbox_class.js_on_change("active", CustomJS(code="source.change.emit();",
                                               args=dict(source=source)))

# Add Whisker to plot (No way to filter Whiskers)
plot.add_layout(Whisker(base='x1', lower='lower1', upper='upper1',
                   line_width=3, line_color='red', line_dash='dashed',
                   source=source))

# Add data points to plot (These are filterable)
plot.circle('x1', 'x1',
            size = 20,
            source = source,
            view = CDSView(source=source, filters=[widget_filters]))

bokeh_layout = layout([plot, checkbox_class],
                          sizing_mode='stretch_both')

show(bokeh_layout)

Annotations (at least, Whisker) don’t support views at the moment. See here for some discussion for Bokeh 3.0: https://github.com/bokeh/bokeh/issues/9955

To work around that, you don’t have to rebuild the whole data. You can have a special, separate, data source for the whiskers and update just that.

1 Like

Thanks a bunch, I was hoping to avoid that but it looks like it’s the direction I’ll be going, do you know any resources for how to filter/ iterate through CDS? Or is it a matter of unzipping everything and then rebuilding the CDS?

Thanks again :slight_smile:

You can check out the long code block at https://docs.bokeh.org/en/latest/docs/user_guide/interaction/callbacks.html#customjs-for-model-property-events for an example of how it works for mapping within a js_on_change callback. Filtering is roughly the same.

1 Like

I got this working using your recommendations and I thought I would post my solution to my example code just in case anyone needs a solution before there is another way available.

from bokeh.layouts import layout
from bokeh.models import ColumnDataSource, OpenHead, Plot, Range1d, Whisker, CDSView, CheckboxGroup, CustomJS
from bokeh.models.filters import CustomJSFilter
from bokeh.plotting import figure, show

x_range = Range1d(0, 10)
y_range = Range1d(0, 10)

# Have to specify x/y range as labels aren't included in the plot area solver
plot = figure(plot_width=600, plot_height=600,
            x_range=x_range, y_range=y_range, toolbar_location=None)

# Data source
source = ColumnDataSource(data=dict(
    x1 = [1,3,5,7,9],
    lower1 = [1,2,1,2,1],
    upper1 = [2,3,2,3,2],
))
whisker_source = ColumnDataSource(data=dict(
    x1 = [1,3,5,7,9],
    lower1 = [1,2,1,2,1],
    upper1 = [2,3,2,3,2],
))

# Setup widget
labels= [str(x) for x in source.data.get('x1')]
checkbox_class = CheckboxGroup(
    labels=labels,
    active=list(range(len(labels))),
    sizing_mode="stretch_width"
)

# Widget callback arguments
arg_dict = dict (
    filter_source=source,
    whisker_source=whisker_source,
    classes = checkbox_class
)

# Create filter for all widgets
widget_filters = CustomJSFilter(args = arg_dict,
                                code =
"""
    let active_classes = classes.active.map(i=>classes.labels[i]);
    let class_column = filter_source.data.x1;
    let whisker_s = whisker_source.data;
    let indices = [];

    // Reset the whisker_source to empty
    for (var i in whisker_s) {
        whisker_s[i] = []
    }

    // Check if there are filters that match the data
    for (let i=0; i<class_column.length; i++) {
        if(active_classes.includes(class_column[i].toString())){
            indices.push(i);

            // Iterate through all columns of the data and push to whisker source
            for (var j in whisker_s) {
                    whisker_s[j].push(filter_source.data[j][i]);
            }
        }
    }

    // Call to update whisker source data
    whisker_source.change.emit();

    // Return filter object
    return indices;
""")

# Watch for changes to user input fields
checkbox_class.js_on_change("active", CustomJS(code="source.change.emit();",
                                               args=dict(source=source)))

# Add Whisker to plot (This now filter with the glyphs)
plot.add_layout(Whisker(base='x1', lower='lower1', upper='upper1',
                   line_width=3, line_color='red', line_dash='dashed',
                   source=whisker_source))

# Add data points to plot (These are filterable)
plot.circle('x1', 'x1',
            size = 20,
            source = source,
            view = CDSView(source=source, filters=[widget_filters]))

bokeh_layout = layout([plot, checkbox_class],
                          sizing_mode='stretch_both')

show(bokeh_layout)
1 Like