[OpenLayers-Users] Re: registering and unregistering map events

[Puneet Kishor]

Seems like the problem I am encountering is that I am unable to "unregister" a "click" event from the map. Is there a way to ascertain if an event has been "unregister"ed successfully? (that is, besides, of course, discovering that it is still firing).


On Oct 3, 2011, at 6:44 PM, Puneet Kishor wrote:

> I would welcome suggestions to solve the following. I want to "enable" the "activation" of a functionality at a certain zoom level, and after the functionality is completed, I want the "deactivate" the functionality, but still keep it enable-able (huh!). See below for a better description of the problem --
> 
> 
>    // add a "zoomend" event so…
>    map.events.register("zoomend", map, function() {
> 
>        // when the map is zoomed in at the correct level,
>        if (map.getZoom() > 3) {
> 
>            // a button is activated so that when the button is clicked…
>            $("#button").bind("click", function() {
> 
>                // the button is turned "on"
>                ..
> 
>                // the map begins listening for clicks to do 
>                // cool functionality
>                map.events.register("click", map, function(e) {
>                    coolFunctionality(e);
>                })
>            });
> 
>        }
> 
>        // but when the map zoom is not at the correct level,
>        else {
> 
>            // map is no longer listening to clicks
>            map.events.unregister("click", map, function(e) {
>                coolFunctionality(e);
>            })
> 
>            // and the button is turned "off" and deactivated
>            $("#button").unbind("click", function() {});   
> 
>        }
>    });
> 
> In another part of the script
> 
>    "coolFunctionality": function (e) {
> 
>        // do cool functionality, 
>        ..
> 
>        // turn the button "off" (but it can still be clicked)
>        ..
> 
>        // and turn off the map listener so it may not be fired accidentally
>        map.events.unregister("click", map, function(e) {
>            coolFunctionality(e);
>        })
>    }
> 
> So, the problem is, when I am in `coolFunctionality()` and `unregister` the event, I am still in the zoom level range where the event is `register`ed. Hmmmm... what to do?
> 
> --
> Puneet Kishor