topic Re: Same event handler for multiple maps in ArcGIS JavaScript Maps SDK Questions

Same event handler for multiple maps

JosephSaltenberger — Wed, 19 Feb 2014 04:04:23 GMT

Is there a way to identify which map instance fired the event handler in the following example? I could set up separate event handlers, but in this case, I will have many maps, and would prefer to keep the handler to one function. Thanks

var mapExtentChange = map.on("extent-change", changeHandler);
var mapExtentChange = map2.on("extent-change", changeHandler);

function changeHandler(evt){
   //if map1 fired then...
   map1.extent = evt.extent;
   //else
   map2.extent = evt.extent;
}

Re: Same event handler for multiple maps

RobertoPepato — Sat, 11 Dec 2021 22:50:40 GMT

Is there a way to identify which map instance fired the event handler in the following example? I could set up separate event handlers, but in this case, I will have many maps, and would prefer to keep the handler to one function. Thanks
var mapExtentChange = map.on("extent-change", changeHandler);
var mapExtentChange = map2.on("extent-change", changeHandler);

function changeHandler(evt){
   //if map1 fired then...
   map1.extent = evt.extent;
   //else
   map2.extent = evt.extent;
}

You can inspect the evt.target.container.id property to discover who raised the event.

Re: Same event handler for multiple maps

JosephSaltenberger — Sat, 11 Dec 2021 22:50:43 GMT

Thanks, that works. I ended up doing this though:

var mapExtentChange = map.on("extent-change", function(evt){
    changeHandler(evt, "map")
});

var mapExtentChange = map2.on("extent-change", function(evt){
    changeHandler(evt, "map2")
});


function changeHandler(evt, mapX){
    //do stuff here with mapX.....
}