text: """ Example demonstrating turning lines on and off - with JS only
  
  """
  
  import numpy as np
  
  from bokeh.io import output_file, show
  from bokeh.layouts import row
  from bokeh.models import CheckboxGroup, CustomJS
  from bokeh.palettes import Viridis3
  from bokeh.plotting import figure
  
  output_file("line_on_off.html", title="line_on_off.py example")
  
  p = figure()
  props = dict(line_width=4, line_alpha=0.7)
  x = np.linspace(0, 4 * np.pi, 100)
  l0 = p.line(x, np.sin(x), color=Viridis3[0], legend_label="Line 0", **props)
  l1 = p.line(x, 4 * np.cos(x), color=Viridis3[1], legend_label="Line 1", **props)
  l2 = p.line(x, np.tan(x), color=Viridis3[2], legend_label="Line 2", **props)
  
  checkbox = CheckboxGroup(labels=["Line 0", "Line 1", "Line 2"],
                           active=[0, 1, 2], width=100)
  checkbox.callback = CustomJS(args=dict(l0=l0, l1=l1, l2=l2, checkbox=checkbox), code="""
  l0.visible = 0 in checkbox.active;
  l1.visible = 1 in checkbox.active;
  l2.visible = 2 in checkbox.active;
  """)
  
  layout = row(checkbox, p)
  show(layout)
  