显示/隐藏谷歌地图JavaScript API上的圆形

Question

尝试在用户悬停时显示Google地图圆形，当他们鼠标移出时隐藏它。此代码可用于在mouseout时隐藏圆形，但无法在mouseover时重新显示圆形。我还尝试了circle.setMap（null），然后circle.setMap（map），这就是我将地图作为showHide函数的参数传递的原因。

var buildings = {};
buildings['Tinsley'] = {
    center: new google.maps.LatLng(30.512028, -90.466363),
    radius: 20,
    description: "<div>Tinsley Hall</div>",
    desMaxWidth: 500,
};
buildings['Pottle'] = {
    center: new google.maps.LatLng(30.513184, -90.467562),
    radius: 40,
    description: "<div>Pottle Hall</div>",
    desMaxWidth: 500,
};
function initialize() {
  var southeastern = new google.maps.LatLng(30.5153382,-90.4676681);
  var mapOptions = {
    zoom: 17,
    center: southeastern
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var ctaLayer = new google.maps.KmlLayer({
    url: 'http://www.southeastern.edu/_new-resources/includes/slu.kml'
  });
  ctaLayer.setMap(null);

  var counter = 0;
  for (var building in buildings) {
    var buildingCircle = {
      strokeColor: 'darkgreen',
      strokeOpacity: 0.3,
      strokeWeight: 3,
      clickable: true,
      fillColor: 'gold',
      fillOpacity: 0.35,
      map: map,
      visible: true,
      center: buildings[building].center,
      radius: buildings[building].radius,
    };
    markerCircle = new google.maps.Circle(buildingCircle);
    attachInfoWindow(map, markerCircle, buildings[building].description);
    showHideCircle(map, markerCircle);
    counter++
  }
}

function attachInfoWindow(map, circle, info){
  var infowindow = new google.maps.InfoWindow({
    content: info
  });  
  google.maps.event.addListener(circle, 'click', function(ev) {
    infowindow.setPosition(circle.getCenter());
    infowindow.open(map);
  });
}

function showHideCircle(map, circle){
  google.maps.event.addListener(circle, 'mouseover', function(){
    circle.setVisible(true);
  });
  google.maps.event.addListener(circle, 'mouseout', function(){
    circle.setVisible(false);
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

- Max

Answer 1

如果您想使用mouseover/out效果，就不能使用"visible"或将圆形从地图上移除。将fillOpacity和stokeOpacity设置为0即可隐藏圆形。

function showHideCircle(map, circle) {
    google.maps.event.addListener(circle, 'mouseout', function () {
        circle.setOptions({fillOpacity:0, strokeOpacity:0});
    });
    google.maps.event.addListener(circle, 'mouseover', function () {
        circle.setOptions({fillOpacity: 0.35, strokeOpacity:0.3});
    });
}

演示代码

代码片段:

var buildings = {};
buildings['Tinsley'] = {
  center: new google.maps.LatLng(30.512028, -90.466363),
  radius: 20,
  description: "<div>Tinsley Hall</div>",
  desMaxWidth: 500,
};
buildings['Pottle'] = {
  center: new google.maps.LatLng(30.513184, -90.467562),
  radius: 40,
  description: "<div>Pottle Hall</div>",
  desMaxWidth: 500,
};

function initialize() {
  var southeastern = new google.maps.LatLng(30.5153382, -90.4676681);
  var mapOptions = {
    zoom: 17,
    center: southeastern
  }

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var ctaLayer = new google.maps.KmlLayer({
    url: 'http://www.southeastern.edu/_new-resources/includes/slu.kml'
  });
  ctaLayer.setMap(null);

  var counter = 0;
  for (var building in buildings) {
    var buildingCircle = {
      strokeColor: 'darkgreen',
      strokeOpacity: 0.3,
      strokeWeight: 3,
      clickable: true,
      fillColor: 'gold',
      fillOpacity: 0.35,
      map: map,
      visible: true,
      center: buildings[building].center,
      radius: buildings[building].radius,
    };
    markerCircle = new google.maps.Circle(buildingCircle);
    attachInfoWindow(map, markerCircle, buildings[building].description);
    showHideCircle(map, markerCircle);
    counter++
  }
}

function attachInfoWindow(map, circle, info) {
  var infowindow = new google.maps.InfoWindow({
    content: info
  });
  google.maps.event.addListener(circle, 'click', function(ev) {
    infowindow.setPosition(circle.getCenter());
    infowindow.open(map);
  });
}

function showHideCircle(map, circle) {
  google.maps.event.addListener(circle, 'mouseout', function() {
    circle.setOptions({
      fillOpacity: 0,
      strokeOpacity: 0
    });
  });
  google.maps.event.addListener(circle, 'mouseover', function() {
    circle.setOptions({
      fillOpacity: 0.35,
      strokeOpacity: 0.3
    });
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

html,
body,
#map-canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas" style="border: 2px solid #3872ac;"></div>

- geocodezip