How to change glyph color using callback?

Question

I tried using Bokeh, and now I want to find the word and change the color of its glyph. My code is as follows:

import bokeh.plotting as bp
from bokeh.models import HoverTool, CustomJS
from bokeh.models.widgets import TextInput
from bokeh.io import vform

words = ["werner", "herbert", "klaus"]
x=[1,2,3]
y=[1,2,3]
color = ['green', 'blue', 'red']
word_input= TextInput(value="word", title="Point out a word")

source = bp.ColumnDataSource(data= dict(x=x,y=y,words=words, color='color'))
hover= HoverTool(tooltips=[("word", "@words")])

# output to static HTML file (with CDN resources)
bp.output_file("plot.html", mode="cdn")

# create a new plot with the tools above, and explicit ranges
p = bp.figure(plot_height = 600, plot_width = 800, title="word2vec", tools=[hover], logo =None)
# add a circle renderer with vectorized colors and sizes
p.circle('x','y', radius= 0.1, color = color, source=source, line_color=None)
callback= CustomJS(args=dict(source=source), code ="""
    var data = source.get('data');
    var glyph = cb_obj.get('value')
    words = data['words']
    colors=data['color']
    for (i=0; i< words.length;i++){
        if(glyph==words[i]){colors[i]='yellow'}        
    }
    source.trigger('change');
""")
layout = vform(word_input, p)
# show the results
bp.show(layout)

This code just doesn't work, and I can't figure out why not.

What am I doing wrong? I sent another question on this day, and this is kind of the first step to solving it.

Answer 1

There are several problems you have:

• you create CallbackJSbut never set it as a callback propertyTextInput

• you set the colordict data key to a string "color", not a list of colors

• color figure ( , , "color")

---

, :

from bokeh.io import vform
from bokeh.models import HoverTool, CustomJS
from bokeh.models.widgets import TextInput
from bokeh.plotting import output_file, figure, show, ColumnDataSource

output_file("plot.html")

words = ["werner", "herbert", "klaus"]
x, y = [1,2,3], [1,2,3]
color = ['green', 'blue', 'red']

source = ColumnDataSource(data=dict(x=x, y=y, words=words, color=color))

hover = HoverTool(tooltips=[("word", "@words")])

p = figure(plot_height=600, plot_width=800, title="word2vec", tools=[hover])
p.circle('x','y', radius=0.1, fill_color='color', source=source, line_color=None)

callback = CustomJS(args=dict(source=source), code="""
    var data = source.get('data')
    var value = cb_obj.get('value')
    var words = data['words']
    for (i=0; i < words.length; i++) {
        if ( words[i]==value ) { data.color[i]='yellow' }
    }
    source.trigger('change')
""")

word_input = TextInput(value="word", title="Point out a word", callback=callback)

layout = vform(word_input, p)

show(layout)