def _get_javascript_runner(self, mode):
"""Returns an appropriate function that executes the given javascript."""
if mode == PERSISTENT:
# Note: want lazy binding, particularly for tests to be able
# to inject custom handling.
# pylint: disable=unnecessary-lambda
return lambda x: _publish.javascript(x)
elif mode == EVAL:
# Note: we don't want javascript value on python side
# unless user specifically requests it using .eval().
# This allows us to properly chain function and javascript class
# (since those are not serializable) and eliminates the need to wait
# for frontend to return.
return lambda x: _js.eval_js('(()=>{' + x + '})()',
ignore_result=True)
else:
raise JsException('Invalid mode: %r.' % mode)
def eval(self):
"""Evals the content on javascript side and returns result.
Note: if the result of this javascript computation is not
json serializable (e.g. it is a function or class) this will fail.
This function does not affect the underlying ipynb.
Usage example:
# this is executed on javascript side, x is opaque reference to
# the result of my_function computation.
x = output.js_global.my_class.my_function(1, 2, 3)
# This gets the value to python
print x.eval()
This works with any javascript mode.
Returns:
evaled javascript.
"""
return _js.eval_js(self._js_value())
