I’m having problems updating the ColumnDataSource using an on_change event with a Select widget. Below is the code. If you click on the image, a random line will be added to the multi_line plot. Once you change the value of the Select widget, it should reset the multi_line ColumnDataSource, erasing the plots. But instead they persist, and if you look at the browser console, the xspsin and yspsin still have the same data (so the sspsin doesn’t update properly). Is the mixing of on_change and CustomJS calls not allowed for ColumnDataSource updates?
from bokeh.models import ColumnDataSource, TapTool
from bokeh.plotting import figure, output_file, show
from bokeh.models import CustomJS, TapTool
from bokeh.models.widgets import Select
from bokeh.layouts import row,column
from bokeh.plotting import curdoc
import numpy as np
#output_file(“test_tap_example.html”)
#create data
xsize=ysize=100
x = np.arange(xsize); y= np.arange(ysize)
image_data = np.random.rand(xsize,ysize)
for i in range(ysize): image_data[:,i] *= np.arange(xsize)
#create column data sources
simage = ColumnDataSource(data = dict(psin=,time=[y],image=[image_data.T]))
sspsin = ColumnDataSource(data=dict(xspsin=,yspsin=))
callback = CustomJS(args=dict(sspsin=sspsin),code=“”"
var xspsin = sspsin.data[‘xspsin’];
var yspsin = sspsin.data[‘yspsin’];
var x = new Array(10);
var y = new Array(10);
for (var iy=0; iy<y.length; iy++){
x[iy] = iy;
y[iy] = Math.random();
}
xspsin.push(x);
yspsin.push(y);
console.log(yspsin);
sspsin.trigger(‘change’);
“”")
taptool = TapTool(callback=callback)
#create tools
p = figure(plot_width=400, plot_height=400,
tools=[taptool,“crosshair”], title=“Click the Dots”,x_range=(0,xsize),y_range=(0,ysize))
p2 = figure(plot_width=400, plot_height=200)
p.image(image=‘image’,source=simage,x=0,y=0,dw=xsize,dh=ysize,palette=‘Spectral9’)
p.rect(x=xsize/2.,y=ysize/2.,width=xsize,height=ysize,alpha=0) #so that taptool responds
p2.multi_line(xs=‘xspsin’,ys=‘yspsin’,source=sspsin)#,color=palette)
for some reason this doesnt update
dropselect = Select(value=“test”,options=[“test”,“test2”])
def dropselect_update(attribute,old,new):
#sspsin.data = dict(xspsin=,yspsin=) #also doesnt work
sspsin.data[‘xspsin’] =
sspsin.data[‘yspsin’] =
print “in dropselect_update”
dropselect.on_change(“value”,dropselect_update)
curdoc().add_root(row(dropselect,p,p2))
``
