Enhance event handling in Google Maps JS API v3 by setting priorities on event listeners

Question

Enhance event handling in Google Maps JS API v3 by setting priorities on event listeners

Is there a way to subtly prioritize event listeners without changing the order they were added in? See code snippet:

var listener1 = function () {
        console.log('@listener1');
    },
    listener2 = function () {
        console.log('@listener2');
    };

google.maps.event.addListener(map, 'idle', listener1);
google.maps.event.addListener(map, 'idle', listener2);

/*
 * Need to prioritize the listeners: I want `listener2` 
 * to be called before `listener1`.
 */
//
//

Check out the JSFiddle here.

javascript google-maps google-maps-api-3

Answer 1

Answer №1

To optimize your code, create a single event listener that calls multiple functions in the desired order. Here is an example:

google.maps.event.addListener(map, 'idle', function() {
    listener2();
    listener1();
});

If your situation is more complex than what you've mentioned, consider using an array to store the functions with potential priorities. Then, iterate through this array within your event listener like so:

var listeners = [];

var listener1 = function () {
    console.log('@listener1');
},
listener2 = function () {
    console.log('@listener2');
};

listeners.push(listener2);
listeners.push(listener1);

google.maps.event.addListener(map, 'idle', function() {
    for (var i = 0; i < listeners.length; i++) {
        listeners[i]();
    }
});

Answer 2

To optimize your code, create a single event listener that calls multiple functions in the desired order. Here is an example:

google.maps.event.addListener(map, 'idle', function() {
    listener2();
    listener1();
});

If your situation is more complex than what you've mentioned, consider using an array to store the functions with potential priorities. Then, iterate through this array within your event listener like so:

var listeners = [];

var listener1 = function () {
    console.log('@listener1');
},
listener2 = function () {
    console.log('@listener2');
};

listeners.push(listener2);
listeners.push(listener1);

google.maps.event.addListener(map, 'idle', function() {
    for (var i = 0; i < listeners.length; i++) {
        listeners[i]();
    }
});

Enhance event handling in Google Maps JS API v3 by setting priorities on event listeners

Answer №1

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