JS callback to show/hide the legend

Community Support
1

Hi, I have tried this to show/hide the legend with a button, here is an example

import bokeh

from bokeh.plotting import figure

from bokeh.models import CustomJS, Button

from bokeh.layouts import gridplot

from bokeh.resources import CDN

from bokeh.embed import file_html

fig = figure()

fig.scatter(range(10),range(10),legend=‘test’)

legend_button = Button(label=‘Hide legend’,width=100,type=‘danger’)

legend_button_code = “”"

if (cb_obj.button_type.includes(“danger”)){

leg.background_fill_alpha=0;

leg.border_line_alpha=0;

leg.items=;

//leg.visible=false;

cb_obj.button_type = “success”;

cb_obj.label = “Show legend”;

} else {

//leg.visible=true;

leg.items=[it];

leg.background_fill_alpha=1;

leg.border_line_alpha=1;

cb_obj.button_type = “danger”;

cb_obj.label = “Hide legend”;

}

“”"

legend_rend = [rend for rend in fig.renderers if type(rend)==bokeh.models.annotations.Legend][0]

legend_item = legend_rend.items[0]

legend_button.callback = CustomJS(args=dict(leg=legend_rend,it=legend_item),code=legend_button_code)

grid = gridplot([[fig,legend_button]])

outfile=open(‘hide_legend.html’,‘w’)

outfile.write(file_html(grid,CDN,‘test’))

outfile.close()

``

This works, but I would like to be able to do this just by using the legend visible attribute instead of having to change alphas and Legend.items indiviually. Why this code doesn’t work if i just use the “leg.visible=” lines in the callback?

Also what should i do so that the update takes place exactly when i click the button? It only updates on change after I use one of the tools (pan/zoom)

this is with bokeh 0.12.4

Thank you,

Seb

2

Hi,

···

On Sat, Jul 1, 2017 at 12:31 AM, [email protected] wrote:

Hi, I have tried this to show/hide the legend with a button, here is an example

import bokeh

from bokeh.plotting import figure

from bokeh.models import CustomJS, Button

from bokeh.layouts import gridplot

from bokeh.resources import CDN

from bokeh.embed import file_html

fig = figure()

fig.scatter(range(10),range(10),legend=‘test’)

legend_button = Button(label=‘Hide legend’,width=100,type=‘danger’)

legend_button_code = “”"

if (cb_obj.button_type.includes(“danger”)){

leg.background_fill_alpha=0;

leg.border_line_alpha=0;

leg.items=;

//leg.visible=false;

cb_obj.button_type = “success”;

cb_obj.label = “Show legend”;

} else {

//leg.visible=true;

leg.items=[it];

leg.background_fill_alpha=1;

leg.border_line_alpha=1;

cb_obj.button_type = “danger”;

cb_obj.label = “Hide legend”;

}

“”"

legend_rend = [rend for rend in fig.renderers if type(rend)==bokeh.models.annotations.Legend][0]

legend_item = legend_rend.items[0]

legend_button.callback = CustomJS(args=dict(leg=legend_rend,it=legend_item),code=legend_button_code)

grid = gridplot([[fig,legend_button]])

outfile=open(‘hide_legend.html’,‘w’)

outfile.write(file_html(grid,CDN,‘test’))

outfile.close()

``

This works, but I would like to be able to do this just by using the legend visible attribute instead of having to change alphas and Legend.items indiviually. Why this code doesn’t work if i just use the “leg.visible=” lines in the callback?

This used to be a bug. This was fixed in 0.12.5 (if I recall correctly).

Also what should i do so that the update takes place exactly when i click the button? It only updates on change after I use one of the tools (pan/zoom)

It sometimes happens that particular properties aren’t listened to (more bugs), so you need to perform an action, like panning a plot, to trigger a repaint.

Mateusz

this is with bokeh 0.12.4

Thank you,

Seb

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3

Figured the update problem, just had to add fig=fig in the callback arguments and fig.trigger(“change”) at the end of the callback code to have the update instantly on click.
However the “leg.visible” part still doesn’t work.

4

Hi, thank you I just tested with 0.12.6 and indeed it works with just setting the ‘visible’ property to true/false

···

Le vendredi 30 juin 2017 18:43:58 UTC-4, mateusz.paprocki a écrit :

Hi,

On Sat, Jul 1, 2017 at 12:31 AM, [email protected] wrote:

Hi, I have tried this to show/hide the legend with a button, here is an example

import bokeh

from bokeh.plotting import figure

from bokeh.models import CustomJS, Button

from bokeh.layouts import gridplot

from bokeh.resources import CDN

from bokeh.embed import file_html

fig = figure()

fig.scatter(range(10),range(10),legend=‘test’)

legend_button = Button(label=‘Hide legend’,width=100,type=‘danger’)

legend_button_code = “”"

if (cb_obj.button_type.includes(“danger”)){

leg.background_fill_alpha=0;

leg.border_line_alpha=0;

leg.items=;

//leg.visible=false;

cb_obj.button_type = “success”;

cb_obj.label = “Show legend”;

} else {

//leg.visible=true;

leg.items=[it];

leg.background_fill_alpha=1;

leg.border_line_alpha=1;

cb_obj.button_type = “danger”;

cb_obj.label = “Hide legend”;

}

“”"

legend_rend = [rend for rend in fig.renderers if type(rend)==bokeh.models.annotations.Legend][0]

legend_item = legend_rend.items[0]

legend_button.callback = CustomJS(args=dict(leg=legend_rend,it=legend_item),code=legend_button_code)

grid = gridplot([[fig,legend_button]])

outfile=open(‘hide_legend.html’,‘w’)

outfile.write(file_html(grid,CDN,‘test’))

outfile.close()

``

This works, but I would like to be able to do this just by using the legend visible attribute instead of having to change alphas and Legend.items indiviually. Why this code doesn’t work if i just use the “leg.visible=” lines in the callback?

This used to be a bug. This was fixed in 0.12.5 (if I recall correctly).

Also what should i do so that the update takes place exactly when i click the button? It only updates on change after I use one of the tools (pan/zoom)

It sometimes happens that particular properties aren’t listened to (more bugs), so you need to perform an action, like panning a plot, to trigger a repaint.

Mateusz

this is with bokeh 0.12.4

Thank you,

Seb

–

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To view this discussion on the web visit https://groups.google.com/a/continuum.io/d/msgid/bokeh/bfe3a602-431c-4190-a4d1-cee5e669eb43%40continuum.io.

For more options, visit https://groups.google.com/a/continuum.io/d/optout.