AjaxDataSource + Flask

Community Support
1

Hi Folks,

I’m trying to get the AjaxDataSource to work from an embedded template served from flask.

  • A flask page serving data + bokeh static html work great:

@app.route("/data", methods=[‘POST’])
def get_x():
global x, y
x = x + 0.1
y = math.sin(x)
return flask.jsonify(x=, y=[y])

``

source = AjaxDataSource(data_url=“http://localhost:5000/data”, polling_interval=1000, mode=‘append’)
p = figure()
p.line(‘x’, ‘y’, source=source)
show(p)

``

  • However, when I try to use an embedded plot from a flask page, the plot fails to render, and the server never sees any queries to the ‘/data’ url:

template = Template(’’’

Streaming Example {{ js_resources }} {{ css_resources }} {{ plot_div }} {{ plot_script }} ''')

@app.route("/")
def simple():
streaming=True
source = AjaxDataSource(data_url=“http://localhost:5000/data”,
polling_interval=1000, mode=‘append’)

fig = figure(title="Streaming Example")
fig.line( 'x', 'y', source=source)

js_resources = INLINE.render_js()
css_resources = INLINE.render_css()

script, div = components(fig, INLINE)
html = template.render(
    plot_script=script,
    plot_div=div,
    js_resources=js_resources,
    css_resources=css_resources
)

return encode_utf8(html)

``

Any thoughts that you might have would be much appreciated. Thanks in advance,

Brian

2

Cross-posted this on stack overflow and got an answer here:

  • Brian
···

On Saturday, May 7, 2016 at 8:12:14 AM UTC-4, [email protected] wrote:

Hi Folks,

I’m trying to get the AjaxDataSource to work from an embedded template served from flask.

  • A flask page serving data + bokeh static html work great:

@app.route(“/data”, methods=[‘POST’])
def get_x():
global x, y
x = x + 0.1
y = math.sin(x)
return flask.jsonify(x=, y=[y])

``

source = AjaxDataSource(data_url=“http://localhost:5000/data”, polling_interval=1000, mode=‘append’)
p = figure()
p.line(‘x’, ‘y’, source=source)
show(p)

``

  • However, when I try to use an embedded plot from a flask page, the plot fails to render, and the server never sees any queries to the ‘/data’ url:

template = Template(‘’'

Streaming Example {{ js_resources }} {{ css_resources }} {{ plot_div }} {{ plot_script }} ''')

@app.route(“/”)
def simple():
streaming=True
source = AjaxDataSource(data_url=“http://localhost:5000/data”,
polling_interval=1000, mode=‘append’)

fig = figure(title="Streaming Example")
fig.line( 'x', 'y', source=source)

js_resources = INLINE.render_js()
css_resources = INLINE.render_css()

script, div = components(fig, INLINE)
html = template.render(
    plot_script=script,
    plot_div=div,
    js_resources=js_resources,
    css_resources=css_resources
)

return encode_utf8(html)

``

Any thoughts that you might have would be much appreciated. Thanks in advance,

Brian