javascript - OL3 overlay not displaying - appendChild error -


i have ol3 application displays map overlays have found in version 3.20 no longer display.

my console log gives following error:

uncaught typeerror: failed execute 'appendchild' on 'node': parameter 1 not of type 'node'.

below code use; when user enters 2 values , clicks on button, retrieve these values , zoom map coordinates, not display overlays. need alter code in way?

//zoom map on coordinate zoom button click $("#coord-zoom-btn").click(function() {     var x = parseint(document.getelementbyid('coord-x').value);     var y = parseint(document.getelementbyid('coord-y').value);     map.setview(new ol.view({         projection: ol.proj.get('epsg:27700'),         resolutions: [28.0, 14.0, 7.0, 3.5, 1.75, 0.875, 0.4375, 0.21875, 0.109375],         center: [x, y],         resolution: 0.21875     }));     if (coordinatemarker && coordinatelabel != null) {         map.removeoverlay(coordinatemarker);         map.removeoverlay(coordinatelabel);     }     coordinatemarker = new ol.overlay({             position: [x, y],             positioning: 'center-center',             element: $('<img src="img/marker/icon_coordinates.png" alt="coordinate marker position">')         }),         coordinatelabel = new ol.overlay({             position: [x, y],             positioning: 'center-center',             offset: [0, -20],             element: $('<h6>x: ' + x + ' y: ' + y + '</h6>')         })     map.addoverlay(coordinatemarker);     map.addoverlay(coordinatelabel); });


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