HandlerFunctions

HandlerFunctions

is an option for asynchronous operations that specifies functions to apply when events are generated.

Details

  • The typical setting for HandlerFunctions is "event1"->f1,"event2"->f2,, which specifies that when eventi is generated, the function fi should be applied to an association whose elements are specified by HandlerFunctionsKeys.
  • The events that can be generated by particular tasks are listed under the functions that submit the tasks.
  • In the HandlerFunctions association, the special element "UnhandledEvent"->f uses the function f for any event for which no explicit handler was specified.

Examples

Basic Examples  (8)

Display the result of evaluation after the task is finished:

Print the complete Association available to a handler function:

Display the result of Print evaluated in a subkernel:

Display a dialog when a message is generated:

Print messages generated by the subkernel:

Handle the "BodyReceived" event when it is generated by URLSubmit:

Store the headers with a variable when they are received:

Print the status code and content type when the task is finished:

Wolfram Research (2016), HandlerFunctions, Wolfram Language function, https://reference.wolfram.com/language/ref/HandlerFunctions.html.

Text

Wolfram Research (2016), HandlerFunctions, Wolfram Language function, https://reference.wolfram.com/language/ref/HandlerFunctions.html.

BibTeX

@misc{reference.wolfram_2020_handlerfunctions, author="Wolfram Research", title="{HandlerFunctions}", year="2016", howpublished="\url{https://reference.wolfram.com/language/ref/HandlerFunctions.html}", note=[Accessed: 16-January-2021 ]}

BibLaTeX

@online{reference.wolfram_2020_handlerfunctions, organization={Wolfram Research}, title={HandlerFunctions}, year={2016}, url={https://reference.wolfram.com/language/ref/HandlerFunctions.html}, note=[Accessed: 16-January-2021 ]}

CMS

Wolfram Language. 2016. "HandlerFunctions." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/HandlerFunctions.html.

APA

Wolfram Language. (2016). HandlerFunctions. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/HandlerFunctions.html