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index.js
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index.js
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/**
* @license
* Copyright 2019 Google LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
// [START maps_control_custom_state]
let map;
const chicago = { lat: 41.85, lng: -87.65 };
/**
* The CenterControl adds a control to the map that recenters the map on
* Chicago.
*/
class CenterControl {
map_;
center_;
constructor(controlDiv, map, center) {
this.map_ = map;
// Set the center property upon construction
this.center_ = new google.maps.LatLng(center);
controlDiv.style.clear = "both";
// Set CSS for the control border
const goCenterUI = document.createElement("button");
goCenterUI.id = "goCenterUI";
goCenterUI.title = "Click to recenter the map";
controlDiv.appendChild(goCenterUI);
// Set CSS for the control interior
const goCenterText = document.createElement("div");
goCenterText.id = "goCenterText";
goCenterText.innerHTML = "Center Map";
goCenterUI.appendChild(goCenterText);
// Set CSS for the setCenter control border
const setCenterUI = document.createElement("button");
setCenterUI.id = "setCenterUI";
setCenterUI.title = "Click to change the center of the map";
controlDiv.appendChild(setCenterUI);
// Set CSS for the control interior
const setCenterText = document.createElement("div");
setCenterText.id = "setCenterText";
setCenterText.innerHTML = "Set Center";
setCenterUI.appendChild(setCenterText);
// Set up the click event listener for 'Center Map': Set the center of
// the map
// to the current center of the control.
goCenterUI.addEventListener("click", () => {
const currentCenter = this.center_;
this.map_.setCenter(currentCenter);
});
// Set up the click event listener for 'Set Center': Set the center of
// the control to the current center of the map.
setCenterUI.addEventListener("click", () => {
const newCenter = this.map_.getCenter();
if (newCenter) {
this.center_ = newCenter;
}
});
}
}
function initMap() {
map = new google.maps.Map(document.getElementById("map"), {
zoom: 12,
center: chicago,
});
// Create the DIV to hold the control and call the CenterControl()
// constructor passing in this DIV.
const centerControlDiv = document.createElement("div");
const control = new CenterControl(centerControlDiv, map, chicago);
// @ts-ignore
centerControlDiv.index = 1;
centerControlDiv.style.paddingTop = "10px";
map.controls[google.maps.ControlPosition.TOP_CENTER].push(centerControlDiv);
}
window.initMap = initMap;
// [END maps_control_custom_state]