Ipywidgets: Dropdown widget view does not update with new options.

[drafter250]

I am not sure if this is a bug or not as I am just getting into ipywidgets. After initial creation of a dropdown widget if you assign a new set of options the view does not update.
so if I do:

import ipywidgets as ipw
opts = ['one','two','three']
dpdown = ipw.Dropdown(description='selector', options=opts)
display(dpdown)
opts.append('four')
dpdown.options = opts
display(dpdown)

I Thought that I would see view update with the 'four' option added but it doesn't. I check the options attribute and it does show the 'four' added to the list.

"Update":
I am on version 4.1.1,
Linux
IE 11 over server.

so I ran the same example code on my local windows version of Anaconda that has ipywidgets 4.1.0 and setting new options does indeed update the _options_dict, _options_values, _options_labels attributes in the Dropdown widget thus the view updates as well. However in 4.1.1 they do not.

I don't see any changes in widget_selection.py between 4.1.1 and 4.1.0

Ultimatley I am trying to keep the options available in the Dropdown synced with a dictionary.

[justinmc]

This works for me in 5.2.2. My exact commands:

from IPython.display import display
import ipywidgets as ipw
opts = ['one','two','three']
dpdown = ipw.Dropdown(description='selector', options=opts)
display(dpdown)

This shows the dropdown with 3 options. Then in the next cell:

opts.append('four')
dpdown.options = opts

The original dropdown now updates to show 4 options.

Should be ok to close this issue?

By the way, if you're looking to sync the options in the dropdown with a dictionary, look at the traitlets library, mainly traitlets.link.

[SylvainCorlay]

What @justinmc said ^

Just adding that you can get ipywidgets 5.x by typing

conda install -c conda-forge ipywidgets

You can also check ipywidgets.jslink for a link on the javascript side.

[gnestor]

@drafter250 Is this issue resolved after upgrading to ipywidgets 5.x?

[drafter250]

Yes sorry i believe it is.

On Thursday, September 29, 2016, Grant Nestor [email protected]
wrote:

@drafter250 https://github.com/drafter250 Is this issue resolved after
upgrading to ipywidgets 5.x?

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