Custom model example raises: Model 'Custom' does not exist

Community Support
1

Hi,

I am trying to make my own custom tool and I keep getting

Error: Model ‘Custom’ does not exist. This could be due to a widget
or a custom model not being registered before first usage.

``

So I just assumed that I’m doing something wrong and tried the example from the custom extensions guide and I got the same error message.

Moreover, I tried this with both Bokeh 0.13.0 and 1.0.1 and the issue is still there.

The full code is:

from bokeh.core.properties import String, Instance

from bokeh.models import LayoutDOM, Slider

from bokeh.io import show, output_file

from bokeh.layouts import column

class Custom(LayoutDOM):

text = String(default="Custom text")

slider = Instance(Slider)

slider = Slider(start=0, end=10, step=0.1, value=0, title=“value”)

custom = Custom(text=“Special Slider Display”, slider=slider)

layout = column(slider, custom)

show(layout)

and I run it with:

python custom.py

``

Am I doing something wrong? Can you point me at least to where should I look?

Thank you,

Madalin

2

Hi,

Almost all of the work in Bokeh is not done in Python, it is almost all done in the Javascript library BokehJS. Defining a Custom Model has two required parts, the Python description, and the JavaScript implementation. You have not supplied an implementation for your custom model. There is an entire chapter in the User's Guide on creating custom extensions complete with several fully worked examples that you can refer to:

  Extending Bokeh — Bokeh 1.0.2 documentation

Thanks,

Bryan

···

On Dec 4, 2018, at 02:39, Madalin Fasie <[email protected]> wrote:

Hi,

I am trying to make my own custom tool and I keep getting

Error: Model 'Custom' does not exist. This could be due to a widget
                     or a custom model not being registered before first usage.

So I just assumed that I'm doing something wrong and tried the example from the custom extensions guide and I got the same error message.

Moreover, I tried this with both Bokeh 0.13.0 and 1.0.1 and the issue is still there.

The full code is:

from bokeh.core.properties import String, Instance
from bokeh.models import LayoutDOM, Slider

from bokeh.io import show, output_file
from bokeh.layouts import column

class Custom(LayoutDOM):
    text = String(default="Custom text")
    slider = Instance(Slider)

slider = Slider(start=0, end=10, step=0.1, value=0, title="value")

custom = Custom(text="Special Slider Display", slider=slider)

layout = column(slider, custom)

show(layout)

and I run it with:

python custom.py

Am I doing something wrong? Can you point me at least to where should I look?

Thank you,
Madalin

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3

Hi,

Thank you for answering, now it’s more clear. I’m sorry for asking an obvious question.

Thanks a lot,

Madalin

În mar., 4 dec. 2018 la 18:34, Bryan Van de ven [email protected] a scris:

···

Hi,

Almost all of the work in Bokeh is not done in Python, it is almost all done in the Javascript library BokehJS. Defining a Custom Model has two required parts, the Python description, and the JavaScript implementation. You have not supplied an implementation for your custom model. There is an entire chapter in the User’s Guide on creating custom extensions complete with several fully worked examples that you can refer to:

    [https://bokeh.pydata.org/en/1.0.2/docs/user_guide/extensions.html](https://bokeh.pydata.org/en/1.0.2/docs/user_guide/extensions.html)

Thanks,

Bryan

On Dec 4, 2018, at 02:39, Madalin Fasie [email protected] wrote:

Hi,

I am trying to make my own custom tool and I keep getting

Error: Model ‘Custom’ does not exist. This could be due to a widget

                 or a custom model not being registered before first usage.

So I just assumed that I’m doing something wrong and tried the example from the custom extensions guide and I got the same error message.

Moreover, I tried this with both Bokeh 0.13.0 and 1.0.1 and the issue is still there.

The full code is:

from bokeh.core.properties import String, Instance

from bokeh.models import LayoutDOM, Slider

from bokeh.io import show, output_file

from bokeh.layouts import column

class Custom(LayoutDOM):

text = String(default="Custom text")

slider = Instance(Slider)

slider = Slider(start=0, end=10, step=0.1, value=0, title=“value”)

custom = Custom(text=“Special Slider Display”, slider=slider)

layout = column(slider, custom)

show(layout)

and I run it with:

python custom.py

Am I doing something wrong? Can you point me at least to where should I look?

Thank you,

Madalin

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