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Editorial Team
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Asked: 2026-06-13T20:10:02+00:00

I have a HTML page which has four buttons Start, Stop, Pause and Resume

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I have a HTML page which has four buttons Start, Stop, Pause and Resume in it. The functionality of the buttons are:

  • Start Button: Starts the backend Simulator. (The Simulator takes around 3 minutes for execution.)
  • Stop Button: Stops the Simulator.
  • Pause Button: Pauses the Simulator.
  • Resume Button: Resumes the Simulator from the paused stage.

Each of the button when clicked goes on to calling a separate view function. The problem I’m facing is that when I click the start button, it starts up the Simulator through a function call in the Python view. But as I mentioned that the simulator takes around 3 minutes for completing it’s execution. So, for the 3 minutes my UI is totally unresponsive. I cannot press Stop, Pause or Resume button untill the current view of Django is rendered.

So what is the best way to approach this problem ? Shall I spawn a non-blocking process for the Simulator and If so how can I get to know after the view has rendered that the new spawned process has completed it’s execution.

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1 Answer

  1. Editorial Team

    You definitely need Ajax for the front-end.

    For the backend you would use something like celery, with which
    you can execute asynchronous tasks(start/stop emulator). To communicate with celery,
    you could do it by polling, long polling or web sockets.

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