javascript - Workng Google Maps API I have it setup so that the user can add a selection rectangle to their screen. How can I only do this just once? -


basically want user able add 1 rectangluar selection map. right adds many want. tried adding making addselection equal noop. didn't me. thought that allow function execute once. anyway trying allow user add 1 rectangular selection map. wondering best path peruse be. 

      html, body {            height: 100%;            margin: 0;            padding: 0;        }        #map {            height: 100%;        }
<body>      <div id="map"></div>      <script>          var map;          var rectangle;          var infowindow;          var penang = {              lat: 5.466277,              lng: 100.289981          };            /**           * centercontrol adds control map recenters map on chicago.           * constructor takes control div argument.           * @constructor           */          function noop() {}            function addselection(controldiv, map) {                // set css control border.                var controlui = document.createelement('div');              controlui.style.backgroundcolor = '#fff';              controlui.style.border = '2px solid #fff';              controlui.style.borderradius = '3px';              controlui.style.boxshadow = '0 2px 6px rgba(0,0,0,.3)';              controlui.style.cursor = 'pointer';              controlui.style.marginbottom = '22px';              controlui.style.textalign = 'center';              controlui.title = 'click make selection';              controldiv.appendchild(controlui);                // set css control interior.              var controltext = document.createelement('div');              controltext.style.color = 'rgb(25,25,25)';              controltext.style.fontfamily = 'roboto,arial,sans-serif';              controltext.style.fontsize = '16px';              controltext.style.lineheight = '38px';              controltext.style.paddingleft = '5px';              controltext.style.paddingright = '5px';              controltext.innerhtml = 'select region';              controlui.appendchild(controltext);                // setup click event listeners: set map chicago.              controlui.addeventlistener('click', function() {                    var centerview = map.getcenter();                  var bounds = map.getbounds();                  var hoach = bounds.getnortheast().lat();                  var moach = bounds.getsouthwest().lat();                  var dim = (hoach - moach) / 4;                  var selectionbounds = new google.maps.latlngbounds(                  new google.maps.latlng(centerview.lat() - dim, centerview.lng() - dim),                  new google.maps.latlng(centerview.lat() + dim, centerview.lng() + dim));                  // define rectangle , set editable property true                    rectangle = new google.maps.rectangle({                      bounds: selectionbounds,                      editable: true,                      draggable: true,                      strokecolor: '#ff0000',                      strokeopacity: 0.8,                      strokeweight: 2,                      fillcolor: '#ff0000',                      fillopacity: 0.35,                      map: map,                  });              });              addselection == noop; //why doesen't limit one?          }            function initmap() {              map = new google.maps.map(document.getelementbyid('map'), {                  zoom: 15,                  pancontrol: true,                  center: penang              });                // create div hold control , call centercontrol() constructor              // passing in div.              var selectioncontroldiv = document.createelement('div');              var selectioncontrol = new addselection(selectioncontroldiv, map);              selectioncontroldiv.index = 1;              map.controls[google.maps.controlposition.top_center].push(selectioncontroldiv);                }      </script>      <script src="https://maps.googleapis.com/maps/api/js?&callback=initmap&signed_in=true" async defer>                </script>  </body>

making addselection equal noop useless, must remove click-listener.

but however, when need button once may remove button after click:

controlui.addeventlistener('click', function() {     this.parentnode.removechild(this);     //continue code...... });

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