User-initiated zoom events?

[geleto]

Hello,
It seems that leaflet has no specific event, which is triggered when the user zooms the map, but not when the zoom level was changed programmatically.
Maybe dragstart should be triggered when pinch-zooming because this usually changes the map position too.
I use the leaflet-locatecontrol and I need to stop tracking the user movements when he drags or pinch-zooms the map.

[Grsmto]

While creating a custom layer I found myself having to hack the lib to have access to zoom events.
I needed to know to which zoom level the map was animating, zoom property is updated only on zoomend event, which is too late if you want to animate anything custom at the same time as the map animation.
If anyone is interested by my solution, what I did is firing a zoom event:
this.fire('zoom', {zoom: zoom}); in setZoom() and setZoomAround() functions from L.Map.

Can be related to #3269

[dmitry]

I have the same situation, when I need to prevent from invoking fitBounds while user interacts with the map. Looks like it could be fixed while #3278, but it's already was merged. I believe it could be named something like triggerSource with values user and program, or just a boolean triggeredByUser.

[dmitry]

Additional information, but related to the google maps: http://stackoverflow.com/questions/10097647/how-to-listen-for-user-generated-zoom-in-google-maps

[dmitry]

Just for anyone, who stuck with the same issue, here are the approach I've used in the project:

  onDragEnd() {
    this.onUserChange();
  },
  onZoomEnd() {
    if (this.isUser) {
      this.onUserChange();
    }
  },
  onMoveEnd() {
    this.isUser = true;
  },

bindings:

    this.map.on('dragend', this.onDragEnd);
    this.map.on('zoomend', this.onZoomEnd);
    this.map.on('moveend', this.onMoveEnd);

Would be nice to replace onMoveEnd to idle (#3178), but for my case that's enough.

[bpinney]

Any update on when this might be added?

[bpinney]

#2267 and #2532 are open issues making the same request

[yohanboniface]

The fastest way of getting this into core is a pull request ;)
We are now working on 1.0.0-rc1 release, and we have frozen the features perimeter of the 1.0, so we will basically only work on bug fixes ourselves. But any pull request will be considered.
So, to answer your question, unless someone provides a pull request, this will not be in Leaflet before 1.1 or later.

[bpinney]

Yes @yohanboniface, doing stuff is always the fastest way to get stuff done :)
I would like some direction as to which solution is best before I take on implementation as the issue doesn't look very simple. I noticed an event muting option for programmatic changes to map state via the API was suggested in #3088, this may be a solution as well.

[frankhommers]

It would be awesome if I could pass arbitrary data on the zoom function in the options, and get access to those options in the zoomstart and zoomend events.

This way I you could detect it yourself because you've passed something ;-) And also it would open a lot more possibilities.

@dmitry Did you find a better way in the mean time?

[jayachandranm]

Any updates on this issue? I still can't find a direct way to resolve this.

[IvanSanchez]

There's a proposed approach at #5247. However I'm not fully convinced by it :-/

[mbrucher]

How can we make it better then?