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Archived discussions · Captured October 28, 2026

data source switches back to last dropdown selection

Community Support
rachel.melamed
rachel.melamedMay 18, 2017   #1

Hi,
You can see my app at http://54.211.36.187/app

When you select the dropdown “Component” it changes how the map is colored.

It’s a bit slow to load/change, but if you are patient you can see that the problem I’m having is that sometimes it switches back to the last selection: not the dropdown, but the “ColumnDataSource” for the data of the map will switch back. But sometimes it won’t do that. Usually, if you keep changing it, it will stop misbehaving at some point.

Has anyone had this before? I have really tried googling it a lot, but the fact that it seems to happen at random makes it difficult to isolate.

Thanks,

Rachel

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Bryan
BryanMay 19, 2017   #2

Hi,

First, wow that is a nice sophisticated app. There are some open issues that can hopefully speed it up considerably (webgl patches, and a true binary array protocol) when they land.

When the problem occurs again, can you check to see if there is any relevant output in either the Bokeh server console log, or in the browser's JavaScript console? Is the source code for this available to inspect?

Thanks,

Bryan

···

On May 18, 2017, at 07:52, rachel.melamed@gmail.com wrote:

Hi,
You can see my app at http://54.211.36.187/app
When you select the dropdown "Component" it changes how the map is colored.
It's a bit slow to load/change, but if you are patient you can see that the problem I'm having is that sometimes it switches back to the last selection: not the dropdown, but the "ColumnDataSource" for the data of the map will switch back. But sometimes it won't do that. Usually, if you keep changing it, it will stop misbehaving at some point.

Has anyone had this before? I have really tried googling it a lot, but the fact that it seems to happen at random makes it difficult to isolate.
Thanks,
Rachel

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rachel.melamed
rachel.melamedMay 19, 2017   #3

Thanks Bryan. And that will be exciting if it gets faster.
The code is at https://github.com/RDMelamed/county-drug-variation/tree/master/app

Also I should mention that not just the columndatasource switches back, but also the plot’s title switches back.

I checked it out and there are no outputs from the bokeh app or in the javascript console.

I’ve just kind of accepted that my app will be slightly buggy but if it’s something I’m doing wrong I would love to fix it.

Thanks,

Rachel

···

On Friday, May 19, 2017 at 1:27:54 AM UTC-4, Bryan Van de ven wrote:

Hi,

First, wow that is a nice sophisticated app. There are some open issues that can hopefully speed it up considerably (webgl patches, and a true binary array protocol) when they land.

When the problem occurs again, can you check to see if there is any relevant output in either the Bokeh server console log, or in the browser’s JavaScript console? Is the source code for this available to inspect?

Thanks,

Bryan

On May 18, 2017, at 07:52, rachel....@gmail.com wrote:

Hi,

You can see my app at http://54.211.36.187/app

When you select the dropdown “Component” it changes how the map is colored.

It’s a bit slow to load/change, but if you are patient you can see that the problem I’m having is that sometimes it switches back to the last selection: not the dropdown, but the “ColumnDataSource” for the data of the map will switch back. But sometimes it won’t do that. Usually, if you keep changing it, it will stop misbehaving at some point.

Has anyone had this before? I have really tried googling it a lot, but the fact that it seems to happen at random makes it difficult to isolate.

Thanks,

Rachel

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