Hey Berry On Mar 3, 2011 6:47 AM, "bratliff" <bratl...@umich.edu> wrote: > > Berry, > > Your comment seems to be unrelated to the post. Please start a new > thread. > > Thanks > Ben > > Sorry > > The use of "function closures" for event listeners might work for a > few dozen markers but it does not scale well for many hundred or many > thousand. Combining event listeners into a common function with > something unique assigned to a property of the marker's "this" object > is a step in the right direction. The redundant function code is > reduced but each marker still requires its own event listener pointing > to the same common function.
It sounds like you're making a new function for each marker's listener. Note that the event target is passed as 'this' to an event listener, so you can reuse a single closure for a class of targets. This is what we do internally for efficiency. > CANVAS does not provide native mouse support. All event listeners > must call some function to determine which of many candidates in a > tile caused the mouse event. Instead of hundreds or thousands of > pointers to a shared function, why not define the function once for an > entire set of markers. Similarly, separate calls to the "setMap" > method might be combined. We invert the control flow that you describe. On click a single function computes which marker was hit, and triggers an event on the Marker object. > The use of "function closures" must be supported for compatability but > it ought to be discouraged & depreciated & replaced. I appreciate the naive use of closures (eg. 1 per marker for 10k markers) causes poor performance, but closures are fast when used well. I think this is an issue of education then - good examples showing how to get the best performance out of browsers. Cheers Ben > > -- > You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. > To post to this group, send email to google-maps-js-api-v3@googlegroups.com. > To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
