The issue arises when attempting to use a JavaScript marker within an array, as it

At the moment, I am in the process of building a website that includes a Google map showcasing my custom markers. Each marker is linked to a specific URL, and the connection is straightforward (as shown with one of my markers below) -

 var image = 'parkour.png';
 var locations = [
    new google.maps.Marker({
      position: new google.maps.LatLng(43.670231, -79.386821),
      map: map,
      url: "http://bit.ly/RDYwKQ",
      icon: image
    })
  ]
  google.maps.event.addListener(locations[0], 'click', function() {
    window.location.href = locations[0].url;
  });

The process involves creating an array, adding elements, and linking them individually. While this method works properly for a single element, it fails when looping through each element to attach a listener to all markers. In this case, none of the markers have a working link (although they still visually display and give the appearance of a link). The code snippet illustrating this scenario is as follows -

  var image = 'parkour.png';
  var locations = [
    new google.maps.Marker({
      position: new google.maps.LatLng(43.670231, -79.386821),
      map: map,
      url: "http://bit.ly/RDYwKQ",
      icon: image
    })
  ]
  for(x in locations) {
    google.maps.event.addListener(x, 'click', function() {
        window.location.href = x.url;
    })
  }

A key modification here is the looped execution of elements following a different calling pattern.

I've attempted various strategies to resolve this issue, from trying a standard for-loop implementation to tweaking the sequence of creating and adding markers to the array, yet no successful solution has been found.

Are there any recommendations or suggestions for addressing this challenge?

Answer №1

A more efficient way to iterate over an array is to use a simple for loop instead of the for in statement. The for in statement is designed to iterate over keys in an object, not elements in an array.

It's also recommended to minimize property lookups and declare variables with a single var statement. When dealing with closures, it's important to be mindful of how they behave within loops. Here's a practical example demonstrating this concept: JavaScript closure inside loops – simple practical example

var i = 0,
    len = locations.length,
    addListener = google.maps.event.addListener,
    l;

for(; i < len; i++) {
    addListener((l = locations[i]), 'click', (function(l) {
        return function () {
            window.location.href = l.url;
        };
    })(l));
}

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