Re: [jupyter] Error: Class my_comm_target not found in registry

[Jason Grout]

If you are using the display system and a mimetype to set up your
rendering, you could possibly use the cookie cutter at
https://github.com/jupyterlab/mimerender-cookiecutter to create the
nbextension.

Jason


On Wed, Nov 22, 2017 at 11:37 PM Jason Grout  wrote:

> Yes, make a notebook nbextension, which is the preferred way to get
> javascript on the page:
>
>
> https://jupyter-notebook.readthedocs.io/en/stable/examples/Notebook/Distributing%20Jupyter%20Extensions%20as%20Python%20Packages.html
>
>
>
> On Wed, Nov 22, 2017 at 7:12 PM John  wrote:
>
>> OK I figured out what my problem was. In my kernel python code I was
>> setting up the comm channel with these two lines of code.
>>
>> display(Javascript("""require(["nbextensions/vpython_libraries/glowcomm"],
>> function(){console.log("GLOWCOMM LOADED");})"""))
>> comm = Comm(target_name='my_comm_target')
>>
>> The first line would run javascript code which in turn registered the
>> target on the javascript front end. The second line would connect to the
>> target from the python side. If I put a time delay between these two
>> commands then the problem goes away because the javascript code has time to
>> execute to register the target to which I am trying to connect the Comm
>> channel to.
>>
>> Is there an alternative approach to ensure that the javascript file I
>> require is loaded when the notebook is opened?
>>
>> John
>>
>>
>>
>> On Wednesday, November 22, 2017 at 4:10:37 PM UTC-8, Jason Grout wrote:
>>
>>> Can you turn on the browser debugger and have it pause on errors, and
>>> see what the lines of code are that are giving the problem (what are the
>>> lines of code, not just the line numbers)? I would probably debug this by
>>> also putting a breakpoint at the registration function and making sure that
>>> was working (i.e., step through the code and make sure that an entry was
>>> stored in the kernel's comm registry). I would also step through the code
>>> where the error happened and inspect the registry.
>>>
>>> For reference, here is where we are registering a target in
>>> widgetsnbextension:
>>> https://github.com/jupyter-widgets/ipywidgets/blob/bbfc39ec0f9e49f730d25bc5347d39e18992a54b/widgetsnbextension/src/manager.js#L71
>>>
>>>
>>> Thanks,
>>>
>>> Jason
>>>
>>>
>>> On Wed, Nov 22, 2017 at 2:30 PM John  wrote:
>>>
>> Hi

I tried opening a Comm from the kernel as described in

 http://jupyter-notebook.readthedocs.io/en/stable/comms.html

 And I am getting the error

 utils.js:910 Could not open comm  --  Error: Class my_comm_target not
 found in registry
 at utils.js:874
 at new Promise ()
 at Object.load_class (utils.js:859)
 at CommManager.comm_open (comm.js:84)
 at i (jquery.min.js:4)
 at Kernel._handle_iopub_message (kernel.js:1223)
 at Kernel._finish_ws_message (kernel.js:1015)
 at kernel.js:1006
 at 
 (anonymous) @ utils.js:910
 Promise rejected (async)
 CommManager.comm_open @ comm.js:85
 i @ jquery.min.js:4
 Kernel._handle_iopub_message @ kernel.js:1223
 Kernel._finish_ws_message @ kernel.js:1015
 (anonymous) @ kernel.js:1006
 Promise resolved (async)
 Kernel._handle_ws_message @ kernel.js:1006
 i @ jquery.min.js:4

 I have have a custom javascript file called glowcomm.js that is
 installed at the location

 nbextensions/vpython_libraries/glowcomm.js

 The javascript code comes from a python package called vpython that
 installs some custom javascript code to this location using

 notebook.nbextensions.install_nbextension(path =
 package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)


 The contents of the glowcomm.js file looks like

 define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
 "nbextensions/vpython_libraries/glow.min"], function() {

 var comm

 IPython.notebook.kernel.comm_manager.register_target('my_comm_target',

 What do I need to do to register "my_comm_target"  so that I don't get
 this error.

 Error: Class my_comm_target not found in registry



 Thanks

 John


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Re: [jupyter] Error: Class my_comm_target not found in registry

[Jason Grout]

Yes, make a notebook nbextension, which is the preferred way to get
javascript on the page:

https://jupyter-notebook.readthedocs.io/en/stable/examples/Notebook/Distributing%20Jupyter%20Extensions%20as%20Python%20Packages.html



On Wed, Nov 22, 2017 at 7:12 PM John  wrote:

> OK I figured out what my problem was. In my kernel python code I was
> setting up the comm channel with these two lines of code.
>
> display(Javascript("""require(["nbextensions/vpython_libraries/glowcomm"],
> function(){console.log("GLOWCOMM LOADED");})"""))
> comm = Comm(target_name='my_comm_target')
>
> The first line would run javascript code which in turn registered the
> target on the javascript front end. The second line would connect to the
> target from the python side. If I put a time delay between these two
> commands then the problem goes away because the javascript code has time to
> execute to register the target to which I am trying to connect the Comm
> channel to.
>
> Is there an alternative approach to ensure that the javascript file I
> require is loaded when the notebook is opened?
>
> John
>
>
>
> On Wednesday, November 22, 2017 at 4:10:37 PM UTC-8, Jason Grout wrote:
>
>> Can you turn on the browser debugger and have it pause on errors, and see
>> what the lines of code are that are giving the problem (what are the lines
>> of code, not just the line numbers)? I would probably debug this by also
>> putting a breakpoint at the registration function and making sure that was
>> working (i.e., step through the code and make sure that an entry was stored
>> in the kernel's comm registry). I would also step through the code where
>> the error happened and inspect the registry.
>>
>> For reference, here is where we are registering a target in
>> widgetsnbextension:
>> https://github.com/jupyter-widgets/ipywidgets/blob/bbfc39ec0f9e49f730d25bc5347d39e18992a54b/widgetsnbextension/src/manager.js#L71
>>
>>
>> Thanks,
>>
>> Jason
>>
>>
>> On Wed, Nov 22, 2017 at 2:30 PM John  wrote:
>>
> Hi
>>>
>>>I tried opening a Comm from the kernel as described in
>>>
>>> http://jupyter-notebook.readthedocs.io/en/stable/comms.html
>>>
>>> And I am getting the error
>>>
>>> utils.js:910 Could not open comm  --  Error: Class my_comm_target not
>>> found in registry
>>> at utils.js:874
>>> at new Promise ()
>>> at Object.load_class (utils.js:859)
>>> at CommManager.comm_open (comm.js:84)
>>> at i (jquery.min.js:4)
>>> at Kernel._handle_iopub_message (kernel.js:1223)
>>> at Kernel._finish_ws_message (kernel.js:1015)
>>> at kernel.js:1006
>>> at 
>>> (anonymous) @ utils.js:910
>>> Promise rejected (async)
>>> CommManager.comm_open @ comm.js:85
>>> i @ jquery.min.js:4
>>> Kernel._handle_iopub_message @ kernel.js:1223
>>> Kernel._finish_ws_message @ kernel.js:1015
>>> (anonymous) @ kernel.js:1006
>>> Promise resolved (async)
>>> Kernel._handle_ws_message @ kernel.js:1006
>>> i @ jquery.min.js:4
>>>
>>> I have have a custom javascript file called glowcomm.js that is
>>> installed at the location
>>>
>>> nbextensions/vpython_libraries/glowcomm.js
>>>
>>> The javascript code comes from a python package called vpython that
>>> installs some custom javascript code to this location using
>>>
>>> notebook.nbextensions.install_nbextension(path =
>>> package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)
>>>
>>>
>>> The contents of the glowcomm.js file looks like
>>>
>>> define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
>>> "nbextensions/vpython_libraries/glow.min"], function() {
>>>
>>> var comm
>>>
>>> IPython.notebook.kernel.comm_manager.register_target('my_comm_target',
>>>
>>> What do I need to do to register "my_comm_target"  so that I don't get
>>> this error.
>>>
>>> Error: Class my_comm_target not found in registry
>>>
>>>
>>>
>>> Thanks
>>>
>>> John
>>>
>>>
>>> --
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>>> Groups "Project Jupyter" group.
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>>
>>
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>>> 
>>> .
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>> --
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> 

Re: [jupyter] Error: Class my_comm_target not found in registry

[John]

OK I figured out what my problem was. In my kernel python code I was 
setting up the comm channel with these two lines of code.

display(Javascript("""require(["nbextensions/vpython_libraries/glowcomm"], 
function(){console.log("GLOWCOMM LOADED");})"""))
comm = Comm(target_name='my_comm_target')

The first line would run javascript code which in turn registered the 
target on the javascript front end. The second line would connect to the 
target from the python side. If I put a time delay between these two 
commands then the problem goes away because the javascript code has time to 
execute to register the target to which I am trying to connect the Comm 
channel to.

Is there an alternative approach to ensure that the javascript file I 
require is loaded when the notebook is opened?

John



On Wednesday, November 22, 2017 at 4:10:37 PM UTC-8, Jason Grout wrote:
>
> Can you turn on the browser debugger and have it pause on errors, and see 
> what the lines of code are that are giving the problem (what are the lines 
> of code, not just the line numbers)? I would probably debug this by also 
> putting a breakpoint at the registration function and making sure that was 
> working (i.e., step through the code and make sure that an entry was stored 
> in the kernel's comm registry). I would also step through the code where 
> the error happened and inspect the registry.
>
> For reference, here is where we are registering a target in 
> widgetsnbextension: 
> https://github.com/jupyter-widgets/ipywidgets/blob/bbfc39ec0f9e49f730d25bc5347d39e18992a54b/widgetsnbextension/src/manager.js#L71
>
>
> Thanks,
>
> Jason
>
>
> On Wed, Nov 22, 2017 at 2:30 PM John  
> wrote:
>
>> Hi
>>
>>I tried opening a Comm from the kernel as described in 
>>
>> http://jupyter-notebook.readthedocs.io/en/stable/comms.html
>>
>> And I am getting the error
>>
>> utils.js:910 Could not open comm  --  Error: Class my_comm_target not 
>> found in registry 
>> at utils.js:874
>> at new Promise ()
>> at Object.load_class (utils.js:859)
>> at CommManager.comm_open (comm.js:84)
>> at i (jquery.min.js:4)
>> at Kernel._handle_iopub_message (kernel.js:1223)
>> at Kernel._finish_ws_message (kernel.js:1015)
>> at kernel.js:1006
>> at 
>> (anonymous) @ utils.js:910
>> Promise rejected (async)
>> CommManager.comm_open @ comm.js:85
>> i @ jquery.min.js:4
>> Kernel._handle_iopub_message @ kernel.js:1223
>> Kernel._finish_ws_message @ kernel.js:1015
>> (anonymous) @ kernel.js:1006
>> Promise resolved (async)
>> Kernel._handle_ws_message @ kernel.js:1006
>> i @ jquery.min.js:4
>>
>> I have have a custom javascript file called glowcomm.js that is installed 
>> at the location 
>>
>> nbextensions/vpython_libraries/glowcomm.js
>>
>> The javascript code comes from a python package called vpython that 
>> installs some custom javascript code to this location using
>>
>> notebook.nbextensions.install_nbextension(path = 
>> package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)
>>
>>
>> The contents of the glowcomm.js file looks like
>>
>> define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
>> "nbextensions/vpython_libraries/glow.min"], function() {
>>
>> var comm
>>
>> IPython.notebook.kernel.comm_manager.register_target('my_comm_target',
>>
>> What do I need to do to register "my_comm_target"  so that I don't get 
>> this error.
>>
>> Error: Class my_comm_target not found in registry 
>>
>>
>>
>> Thanks
>>
>> John
>>
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "Project Jupyter" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to jupyter+u...@googlegroups.com .
>> To post to this group, send email to jup...@googlegroups.com 
>> .
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/jupyter/630e2d49-96e9-4f88-b927-42c36dfcf883%40googlegroups.com
>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>

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Re: [jupyter] Error: Class my_comm_target not found in registry

[Jason Grout]

Can you turn on the browser debugger and have it pause on errors, and see
what the lines of code are that are giving the problem (what are the lines
of code, not just the line numbers)? I would probably debug this by also
putting a breakpoint at the registration function and making sure that was
working (i.e., step through the code and make sure that an entry was stored
in the kernel's comm registry). I would also step through the code where
the error happened and inspect the registry.

For reference, here is where we are registering a target in
widgetsnbextension:
https://github.com/jupyter-widgets/ipywidgets/blob/bbfc39ec0f9e49f730d25bc5347d39e18992a54b/widgetsnbextension/src/manager.js#L71


Thanks,

Jason


On Wed, Nov 22, 2017 at 2:30 PM John  wrote:

> Hi
>
>I tried opening a Comm from the kernel as described in
>
> http://jupyter-notebook.readthedocs.io/en/stable/comms.html
>
> And I am getting the error
>
> utils.js:910 Could not open comm  --  Error: Class my_comm_target not
> found in registry
> at utils.js:874
> at new Promise ()
> at Object.load_class (utils.js:859)
> at CommManager.comm_open (comm.js:84)
> at i (jquery.min.js:4)
> at Kernel._handle_iopub_message (kernel.js:1223)
> at Kernel._finish_ws_message (kernel.js:1015)
> at kernel.js:1006
> at 
> (anonymous) @ utils.js:910
> Promise rejected (async)
> CommManager.comm_open @ comm.js:85
> i @ jquery.min.js:4
> Kernel._handle_iopub_message @ kernel.js:1223
> Kernel._finish_ws_message @ kernel.js:1015
> (anonymous) @ kernel.js:1006
> Promise resolved (async)
> Kernel._handle_ws_message @ kernel.js:1006
> i @ jquery.min.js:4
>
> I have have a custom javascript file called glowcomm.js that is installed
> at the location
>
> nbextensions/vpython_libraries/glowcomm.js
>
> The javascript code comes from a python package called vpython that
> installs some custom javascript code to this location using
>
> notebook.nbextensions.install_nbextension(path =
> package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)
>
>
> The contents of the glowcomm.js file looks like
>
> define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
> "nbextensions/vpython_libraries/glow.min"], function() {
>
> var comm
>
> IPython.notebook.kernel.comm_manager.register_target('my_comm_target',
>
> What do I need to do to register "my_comm_target"  so that I don't get
> this error.
>
> Error: Class my_comm_target not found in registry
>
>
>
> Thanks
>
> John
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Project Jupyter" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to jupyter+unsubscr...@googlegroups.com.
> To post to this group, send email to jupyter@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/jupyter/630e2d49-96e9-4f88-b927-42c36dfcf883%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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[jupyter] Error: Class my_comm_target not found in registry

[John]

Hi

   I tried opening a Comm from the kernel as described in 

http://jupyter-notebook.readthedocs.io/en/stable/comms.html

And I am getting the error

utils.js:910 Could not open comm  --  Error: Class my_comm_target not found 
in registry 
at utils.js:874
at new Promise ()
at Object.load_class (utils.js:859)
at CommManager.comm_open (comm.js:84)
at i (jquery.min.js:4)
at Kernel._handle_iopub_message (kernel.js:1223)
at Kernel._finish_ws_message (kernel.js:1015)
at kernel.js:1006
at 
(anonymous) @ utils.js:910
Promise rejected (async)
CommManager.comm_open @ comm.js:85
i @ jquery.min.js:4
Kernel._handle_iopub_message @ kernel.js:1223
Kernel._finish_ws_message @ kernel.js:1015
(anonymous) @ kernel.js:1006
Promise resolved (async)
Kernel._handle_ws_message @ kernel.js:1006
i @ jquery.min.js:4

I have have a custom javascript file called glowcomm.js that is installed 
at the location 

nbextensions/vpython_libraries/glowcomm.js

The javascript code comes from a python package called vpython that 
installs some custom javascript code to this location using

notebook.nbextensions.install_nbextension(path = 
package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)


The contents of the glowcomm.js file looks like

define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
"nbextensions/vpython_libraries/glow.min"], function() {

var comm

IPython.notebook.kernel.comm_manager.register_target('my_comm_target',

What do I need to do to register "my_comm_target"  so that I don't get this 
error.

Error: Class my_comm_target not found in registry 



Thanks

John


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