Google map - show dialog box with on click event

Dear Experts,
I use PHP and MySQL
I connect my database and get all the latitude and longtitude information I need and pin it on the below Google map sample.
Everything is perfectly fine. When I mouse over the flag (pin) it shows the information however, I need to have a dialog box.
When pin ( flag ) clicked I need to show a box with information inside.

How can I do that? thank you
my code is:
<!DOCTYPE html>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Complex icons</title>
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      /* Optional: Makes the sample page fill the window. */
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
    <div id="map"></div>

      // The following example creates complex markers to indicate beaches near
      // Sydney, NSW, Australia. Note that the anchor is set to (0,32) to correspond
      // to the base of the flagpole.

      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 7,
          center: {lat: 42.9, lng: 36.2}


      // Data for the markers consisting of a name, a LatLng and a zIndex for the
      // order in which these markers should display on top of each other.
      var beaches = [
        <?php echo $yaz ;?>

	// ['Bondi Beach', -33.890542, 151.274856, 4],
       //  ['Maroubra Beach', -33.950198, 151.259302, 1]

      function setMarkers(map) {
        // Adds markers to the map.

        // Marker sizes are expressed as a Size of X,Y where the origin of the image
        // (0,0) is located in the top left of the image.

        // Origins, anchor positions and coordinates of the marker increase in the X
        // direction to the right and in the Y direction down.
        var image = {
          url: '',
          // This marker is 20 pixels wide by 32 pixels high.
          size: new google.maps.Size(20, 32),
          // The origin for this image is (0, 0).
          origin: new google.maps.Point(0, 0),
          // The anchor for this image is the base of the flagpole at (0, 32).
          anchor: new google.maps.Point(0, 32)
        // Shapes define the clickable region of the icon. The type defines an HTML
        // <area> element 'poly' which traces out a polygon as a series of X,Y points.
        // The final coordinate closes the poly by connecting to the first coordinate.
        var shape = {
          coords: [1, 1, 1, 20, 18, 20, 18, 1],
          type: 'poly'
        for (var i = 0; i < beaches.length; i++) {
          var beach = beaches[i];
          var marker = new google.maps.Marker({
            position: {lat: beach[1], lng: beach[2]},
            map: map,
            icon: image,
            shape: shape,
            title: beach[0],
            zIndex: beach[3]
    <script async defer

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Dorababu MSenior Software EngineerCommented:

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BRMarketingAuthor Commented:
Thank you
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