Mixing server code and JS_callback

Community Support
1

Hi,

May I ask if there is a way to mix bokeh server code and custom JS in a single call back?

For example, I have a button for download, but I want to generate the download file on demand. Something like

def download_func():
# some server side code.
# prepare the target file

# JS code, redirecting the browser to download the file after the preparation is done.

button = Button()
button.on_click(download_func)

``

Something like the readfile() function in PHP that sends a file to user’s browser?

Thanks,

Hongyi

2

I have found another ugly workaround.

Basically, I created an invisible html asset and attached a CustomJS callback to it.

To trigger this CustomJS function, I simply need to update its value in my python code. Wish there were better ways but I guess this works.

···

On Tuesday, December 4, 2018 at 12:57:05 AM UTC-5, Hongyi Xin wrote:

Hi,

May I ask if there is a way to mix bokeh server code and custom JS in a single call back?

For example, I have a button for download, but I want to generate the download file on demand. Something like

def download_func():
# some server side code.
# prepare the target file

# JS code, redirecting the browser to download the file after the preparation is done.

button = Button()
button.on_click(download_func)

``

Something like the readfile() function in PHP that sends a file to user’s browser?

Thanks,

Hongyi

3

I also do it this way and couldn’t find a better way.

···

On Dec 6, 2018, at 11:57 AM, Hongyi Xin [email protected] wrote:

I have found another ugly workaround.

Basically, I created an invisible html asset and attached a CustomJS callback to it.

To trigger this CustomJS function, I simply need to update its value in my python code. Wish there were better ways but I guess this works.

On Tuesday, December 4, 2018 at 12:57:05 AM UTC-5, Hongyi Xin wrote:

Hi,

May I ask if there is a way to mix bokeh server code and custom JS in a single call back?

For example, I have a button for download, but I want to generate the download file on demand. Something like

def download_func():
# some server side code.
# prepare the target file

# JS code, redirecting the browser to download the file after the preparation is done.

button = Button()
button.on_click(download_func)

``

Something like the readfile() function in PHP that sends a file to user’s browser?

Thanks,

Hongyi

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