使用基于要素属性的外部按钮切换 Google Maps API 数据层要素

Question

The documentation for the Google Maps API Data Layer - Dynamic Styling explains how to add an event listener to a feature so when that feature is clicked, we can change its property. Google Maps API Data Layer - Dynamic Styling的文档解释了如何向功能添加事件侦听器，以便在单击该功能时，我们可以更改其属性。

How can I do something similar with a button external to the map?如何使用地图外部的按钮执行类似操作？ In the fiddle example, how can I turn the letters on the map that have the "blue" property to blue by clicking the "blue" button?在小提琴示例中，如何通过单击“蓝色”按钮将地图上具有“蓝色”属性的字母变为蓝色？

Fiddle example小提琴示例

<!DOCTYPE html>
<html>
  <head>
    <title>Data Layer: Dynamic Styling</title>
    <meta name="viewport" content="initial-scale=1.0">
    <meta charset="utf-8">
    <style>#map {
    height: 500px;
  }
  </style>
  </head>
  <body>
<button id="blue-button">blue</button>
<button id="red-button">red</button>
<button id="green-button">green</button>
<button id="yellow-button">yellow</button>
<div id="map"></div>
    <script>

      var map;
      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          zoom: 4,
          center: {lat: -28, lng: 137}
        });

        // Load GeoJSON.
        map.data.loadGeoJson(
            'https://storage.googleapis.com/mapsdevsite/json/google.json');

        // Color each letter gray. Change the color when the isColorful property
        // is set to true.
        map.data.setStyle(function(feature) {

          var color = 'gray';

          if (feature.getProperty('isColorful')) {
            color = feature.getProperty('color');
            console.log(color)
          }

          return ({
            fillColor: color,
            strokeColor: color,
            strokeWeight: 2
          });

        });

        // When the user clicks, set 'isColorful', changing the color of the letters.
        map.data.addListener('click', function(event) {
          event.feature.setProperty('isColorful', true);
        });

      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB9BG3aO_hV9r8qaGkYmcE5eSx7c4K7be4&callback=initMap">
    </script>
  </body>
</html>

Answer 1

Add a listener for your button click.为您的按钮单击添加一个侦听器。 This can be done in different ways.这可以通过不同的方式完成。 One of them is to use the Google Maps addDomListener .其中之一是使用谷歌地图addDomListener 。

Then you must loop through all features and set the appropriate style, for example:然后您必须遍历所有功能并设置适当的样式，例如：

 var map; function initMap() { map = new google.maps.Map(document.getElementById('map-canvas'), { zoom: 4, center: { lat: -28, lng: 137 } }); // Load GeoJSON. map.data.loadGeoJson( 'https://storage.googleapis.com/mapsdevsite/json/google.json'); // Color each letter gray. Change the color when the isColorful property // is set to true. map.data.setStyle(function(feature) { var color = 'gray'; if (feature.getProperty('isColorful')) { color = feature.getProperty('color'); console.log(color) } return ({ fillColor: color, strokeColor: color, strokeWeight: 2 }); }); // When the user clicks, set 'isColorful', changing the color of the letters. map.data.addListener('click', function(event) { event.feature.setProperty('isColorful', true); }); google.maps.event.addDomListener(document.getElementById('blue-button'), 'click', function() { map.data.setStyle(function(feature) { if (feature.getProperty('color') == 'blue') { return ({ fillColor: 'blue', strokeColor: 'blue', strokeWeight: 2 }); } else { return ({ fillColor: 'grey', fillOpacity: .5, strokeColor: 'grey', strokeWeight: 2 }); } }); }); }

 #map-canvas { height: 160px; }

 <button id="blue-button">blue</button> <div id="map-canvas"></div> <!-- Replace the value of the key parameter with your own API key. --> <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"> </script>

使用基于要素属性的外部按钮切换 Google Maps API 数据层要素

问题描述

1 个解决方案

解决方案1
1 已采纳 2019-03-14 16:51:21

使用基于要素属性的外部按钮切换 Google Maps API 数据层要素

问题描述

1 个解决方案

解决方案1 1 已采纳 2019-03-14 16:51:21

解决方案1
1 已采纳 2019-03-14 16:51:21