Adding a button with onclick on InfoWindow - Google Maps API

InfoWindow in google maps is a type of toast div or should I say a popover that appears when we hover over the map marker, it contains information about a specific place anything you want to show in it.

• Let me show you the easiest way to add a button with onclick function inside the infoWindow content string if nothing else is working or if you are trying to click on the button before the DOM is ready.

• Content String:
  

let buttonName = "any name"; 
let contentString = "<div>" +
                     // other divs ....
                      "<button id='btn-click'>" + buttonName                       
                       + "</button>" 
                     // other divs ....
                    +"</div>";

• Adding click event on your function:

google.maps.event.addListener(infoWindow, 'domready' () => {
 const someButton = document.getElementById('btn-click');
 if (someButton) {
   google.maps.listener.addDomListener(someButton, 'click',    
   () => {
           // show something.
           // add something.
         })
 }
});

• Marker Code:

google.maps.event.addListener(marker, 'mouseover', function(){
 // some code about setting content inside info window or showing up the info window however you want to show it.
});

That's it, let me know if it worked :).