This example demonstrates adding controls that store state. It shows a map with two buttons, "Set Center" and "Center Map". The "Set Center" button can be used to store the center of the map. Pressing the "Center Map" button will pan the map to the previously stored center.
Read the documentation.
Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
git clone -b sample-control-custom-state https://github.com/googlemaps/js-samples.git
Other samples can be tried by switching to any branch beginning with
git checkout sample-SAMPLE_NAME