How to have js retrieve array data from a module controller

My experience with Drupal and Ajax has been limited to the context of a form. In this case, there is no form involved, so also no pre-process.

I am using FullCalendar. My desired flow is this:

  • Prior to rendering the calendar from js, or re-rendering it when the month is changed, call a controller method
  • The controller methods create an array of dates for the requested month that are holidays or reservations
  • The date array is then returned to js to be iterated and used make a FullCalendar api call to set the attributes/content of the given date

The problem I am having is that all mentions of AJAX I find are related to returning markup to replace page markup. In particular, I have two issues:

  • How do I return the array from the AJAX method in the controller? A response object has to be a string

  • How do I act on the returned data? I can’t just do

    var myDates = $.ajax()

I can process it in the AJAX success function, but that function is outside the FullCalendar object that does the setup and rendering, meaning I think that I need to get that array back inside the FullCalendar object that called the AJAX rather than operating on it in the AJAX success method.

This article was republished from its original source.
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How to have js retrieve array data from a module controller

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