How to Efficiently Remove Markers in Google Maps API v3?

Efficient Marker Removal in Google Maps API v3

Removing markers from a mapping application is a common requirement. In the previous version (v2) of Google Maps API, this could be achieved effortlessly using the clearOverlays() method. However, the migration to v3 complicates the process due to differences in implementation.

To effectively remove markers in v3, a few steps are necessary. First, create a global variable markersArray to store the markers. Then, define a function called clearOverlays(). Within this function, iterate through the markersArray and set each marker's map property to null. Finally, reset the markersArray length to zero.

Optionally, you can extend the Map class to incorporate the clearOverlays() function. This allows for direct usage from the map object, such as myMap.clearOverlays().

To include markers in the markersArray, remember to push them into the array after creation. Additionally, add event listeners to each marker before pushing to ensure proper functionality.

By following these steps, you can easily remove all markers from your Google Maps API v3 application:

1. Declare the markersArray variable globally.
2. Define the clearOverlays() function as described above.
3. Push markers into the markersArray before adding event listeners.
4. Call the clearOverlays() function whenever needed to remove all markers.

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