[IPython-dev] widget value persistence

Brian Granger ellisonbg@gmail....
Thu Feb 27 14:45:59 CST 2014


Yes, for now the right answer is to set the value attribute of the
slider when you construct it. If you are using interact, you can
change the default value for the widget by changing the keyword
argument in the function def.

On Thu, Feb 27, 2014 at 11:57 AM, Thomas Kluyver <takowl@gmail.com> wrote:
> Hi Darren,
>
> On 27 February 2014 11:37, Darren Dale <dsdale24@gmail.com> wrote:
>>
>> However, I have a question about portions of the analysis that would
>> require user interaction via a widget. Suppose I start from an ipynb
>> template which includes a slider that defaults to 25. My particular dataset
>> requires the slider to be set to 30. Is it possible for an ipynb widget to
>> save its most recent value as the new default value for the next time the
>> notebook is run? This would be a game-changer for developing user interfaces
>> for scientific applications.
>
>
> We haven't yet worked out how to save widgets, so they disappear entirely
> when you reload a notebook. We'll get to that for 3.0, and I imagine then
> that the latest value of a slider will be saved with the notebook.
>
> However, if you re-run the cell, I think it will (and should) always return
> the default to what the code specifies. I think it's important that running
> code has a predictable result. But I don't think this is a problem: if you
> want the default to be 30, just set it to 30 in your code.
>
> Best wishes,
> Thomas
>
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-- 
Brian E. Granger
Cal Poly State University, San Luis Obispo
bgranger@calpoly.edu and ellisonbg@gmail.com


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