Trying to include js_on_change & callback in bokeh graph

[vinay_tiwari]

Hi Community , Greeting of the day.

I am trying to implement js_on_change on Pie graph but unable to do so . I am new to bokeh and JavaScript . Below is my code . So basically I want to implement a functionality that when ever I deselect any fruit , then my Pie chart should redraw itself by excluding that fruit from calculation .

My code is below .

from bokeh.models import ColumnDataSource,CustomJS,Slider
from bokeh.models import CheckboxGroup
from math import pi
import pandas as pd
from bokeh.io import show
from bokeh.plotting import figure
from bokeh.transform import cumsum 

from bokeh.palettes import Category10
fruits = {'Apple': 10,
          'Mango': 24,
          'Graphes': 9,
          'Banana': 15,
          'Peach': 6,
          'Pinapple' : 7,
    }

data = pd.Series(fruits).reset_index(name='value').rename(columns={'index':'Fruits'})
data['angle']=data['value']/data['value'].sum() * 2 *pi
data['color'] = Category10[len(fruits)]
data['percent']= data['value']/sum(fruits.values()) *100
p=figure(plot_height= 350 , title='Pie chart',tools = "hover",
         tooltips="@Fruits: @value  : @percent{0.2f} %", x_range=(-0.5,1.0))
p.wedge(x=0, y=1, radius=0.4,
        start_angle=cumsum('angle', include_zero=True), end_angle=cumsum('angle'),
        line_color="white", fill_color='color', legend='Fruits', source=data)
p.axis.axis_label=None
p.axis.visible=False
p.grid.grid_line_color=None

callback =CustomJS(args = {'source':fruits},
code="""
var active=cb_obj.active;
const data = source;
const data1 = source;

var key1 = Object.keys(data)
var values1 = Object.values(data)
var new_fruit={}

var i=0
for (const [key,value] of Object.entries(data)) {
console.log(key,value);
console.log(active.includes(i));
var bool = active.includes(i);
if (bool==true)
  { console.log(active.includes(i));
    new_fruit[key]=value;

}
i=i+1
}


console.log("Callback completed");
console.log(active);
console.log(new_fruit);
"""
                  )
L = ["Apple","Mango","Graphes","Banana","Peach","Pinapple"]

checkbox_group = CheckboxGroup(labels=L, active =[0,1,2,3,4,5])
checkbox_group.js_on_change('active',callback)
layout = column(checkbox_group,p)

show(layout)

[Bryan]

Hi @vinay_tiwari please edit your post to use code formatting so that the code is intelligible (either with the </> icon on the editing toolbar, or triple backtick ``` fences around the code blocks)