More aggressively cache/pre-fetch events from AJAX calls

Originally reported on Google Code with ID 1822

Hello,

Maybe I understand lazyFetching wrong or I remember it working wrong, but from what
I recall if I had this lazyFetching set to true (by default) and switched weeks in
weekAgenda view, calendar fetched each week only once. Right now it fetches weeks all
the time (when I switch back and forth). Shouldn't it keep events in memory?

Kind regards,
Mike

Reported by koniczynek on 2013-05-04 19:58:51

Imported with 8 stars.

[mattclar]

could I suggest an implementation such as having a lazyFetchDays: paramater that fetches x days ahead and behind the current, that way scrolling between days becomes smoother because the cache already has the days prefetched. You would probably set the default to 0 days just so as not to change behaviour

[mattclar]

I have written my own caching method to get around this limitation, its pretty simple to implement in your code, I haven’t quite written the initial bit which aims to pull the event data from the page to speed the initial load. Then it does an ajax request and stores the results for the rendered day +/- 3 days in the cache, further calls to the method hut the cache first and also trigger a reload of the cache advancing it along so you always have a buffer of three days to supply to the calendar. This is appropriate for my needs…hope it helps others too. PS sorry its in coffescript the autotranscribed js was ugly

    $('#calendar').fullCalendar events: (start, end, timezone, callback) ->
        eventsProvided = false
        if isInitialLoad is true
          #find events in page
        else
          if moment(start).isSameOrAfter(apptCacheStart) and moment(end).isSameOrBefore(apptCacheEnd)
            callback appointmentsCache
            eventsProvided = true

        $.ajax
          url: '/appointments.json'
          dataType: 'json'
          data:
            start: start.subtract(3, 'days').toISOString()
            end: end.add(3, 'days').toISOString()
          success: (events) ->
            isInitialLoad = false
            apptCacheStart = start.subtract(3, 'days')
            apptCacheEnd = end.add(3, 'days')
            appointmentsCache = []
            appointmentsCache = appointmentsCache.concat events
            if eventsProvided isnt true 
              callback appointmentsCache