Mausereignisse verarbeiten

Plattform auswählen: Android iOS JavaScript

Übersicht

Sie können eine Feature-Ebene so konfigurieren, dass auf mousemove- und click-Ereignisse reagiert wird, um Informationen zur angeklickten Grenze zurückzugeben. Dazu gehören die ID, der Anzeigename und der Elementtyp. Die folgende Beispielkarte zeigt die Grenzen für Verwaltungsgebiet Ebene 2 an und verfügt über einen Ereignisverarbeitungscode, der Stile Polygone basierend auf der Nutzerinteraktion; mousemove ändert den Rahmen mit der Schriftstärke click die Hintergrundfarbe abdunkelt, sodass ein Infofenster Display).

Ereignisse auf Feature-Ebene aktivieren

So aktivieren Sie Ereignisse auf Feature-Ebene:

  1. Um eine Feature-Ebene für Benachrichtigungen bei Ereignissen zu konfigurieren, rufen Sie für jedes Ereignis, das Sie registrieren möchten, die Funktion addListener() auf der Feature-Ebene auf. In diesem Beispiel erhält die Karte auch einen Listener.

    TypeScript

    // Add the feature layer.
    //@ts-ignore
    featureLayer = map.getFeatureLayer('ADMINISTRATIVE_AREA_LEVEL_2');
    
    // Add the event listeners for the feature layer.
    featureLayer.addListener('click', handleClick);
    featureLayer.addListener('mousemove', handleMouseMove);
    
    // Map event listener.
    map.addListener('mousemove', () => {
      // If the map gets a mousemove, that means there are no feature layers
      // with listeners registered under the mouse, so we clear the last
      // interacted feature ids.
      if (lastInteractedFeatureIds?.length) {
        lastInteractedFeatureIds = [];
        featureLayer.style = applyStyle;
      }
    });

    JavaScript

    // Add the feature layer.
    //@ts-ignore
    featureLayer = map.getFeatureLayer("ADMINISTRATIVE_AREA_LEVEL_2");
    // Add the event listeners for the feature layer.
    featureLayer.addListener("click", handleClick);
    featureLayer.addListener("mousemove", handleMouseMove);
    // Map event listener.
    map.addListener("mousemove", () => {
      // If the map gets a mousemove, that means there are no feature layers
      // with listeners registered under the mouse, so we clear the last
      // interacted feature ids.
      if (lastInteractedFeatureIds?.length) {
        lastInteractedFeatureIds = [];
        featureLayer.style = applyStyle;
      }
    });

  2. Fügen Sie Ereignishandler-Code hinzu, um das ausgewählte Polygon je nach Art der Interaktion zu formatieren.

    TypeScript

    function handleClick(/* MouseEvent */ e) {
      lastClickedFeatureIds = e.features.map(f => f.placeId);
      lastInteractedFeatureIds = [];
      featureLayer.style = applyStyle;
      createInfoWindow(e);
    }
    
    function handleMouseMove(/* MouseEvent */ e) {
      lastInteractedFeatureIds = e.features.map(f => f.placeId);
      featureLayer.style = applyStyle;
    }

    JavaScript

    function handleClick(/* MouseEvent */ e) {
      lastClickedFeatureIds = e.features.map((f) => f.placeId);
      lastInteractedFeatureIds = [];
      featureLayer.style = applyStyle;
      createInfoWindow(e);
    }
    
    function handleMouseMove(/* MouseEvent */ e) {
      lastInteractedFeatureIds = e.features.map((f) => f.placeId);
      featureLayer.style = applyStyle;
    }
    

  3. Verwenden Sie eine Stilfunktion für Elemente, um Stile anzuwenden. Stilfunktion für Elemente wird das Design basierend auf der Art der Interaktion bedingt angewendet. Hier sind drei Stile definiert: einer, um den Rahmen bei mousemove fett zu formatieren, einer, um den Hintergrund zu ändern und ein Infofenster bei click anzuzeigen, und ein Standardstil.

    TypeScript

    // Define styles.
    // Stroke and fill with minimum opacity value.
    const styleDefault = {
      strokeColor: '#810FCB',
      strokeOpacity: 1.0,
      strokeWeight: 2.0,
      fillColor: 'white',
      fillOpacity: 0.1,  // Polygons must be visible to receive events.
    };
    // Style for the clicked polygon.
    const styleClicked = {
      ...styleDefault,
      fillColor: '#810FCB',
      fillOpacity: 0.5,
    };
    // Style for polygon on mouse move.
    const styleMouseMove = {
      ...styleDefault,
      strokeWeight: 4.0,
    };
    
    // Apply styles using a feature style function.
    function applyStyle(/* FeatureStyleFunctionOptions */ params) {
      const placeId = params.feature.placeId;
      //@ts-ignore
      if (lastClickedFeatureIds.includes(placeId)) {
        return styleClicked;
      }
      //@ts-ignore
      if (lastInteractedFeatureIds.includes(placeId)) {
        return styleMouseMove;
      }
      return styleDefault;
    }

    JavaScript

    // Define styles.
    // Stroke and fill with minimum opacity value.
    const styleDefault = {
      strokeColor: "#810FCB",
      strokeOpacity: 1.0,
      strokeWeight: 2.0,
      fillColor: "white",
      fillOpacity: 0.1, // Polygons must be visible to receive events.
    };
    // Style for the clicked polygon.
    const styleClicked = {
      ...styleDefault,
      fillColor: "#810FCB",
      fillOpacity: 0.5,
    };
    // Style for polygon on mouse move.
    const styleMouseMove = {
      ...styleDefault,
      strokeWeight: 4.0,
    };
    
    // Apply styles using a feature style function.
    function applyStyle(/* FeatureStyleFunctionOptions */ params) {
      const placeId = params.feature.placeId;
    
      //@ts-ignore
      if (lastClickedFeatureIds.includes(placeId)) {
        return styleClicked;
      }
    
      //@ts-ignore
      if (lastInteractedFeatureIds.includes(placeId)) {
        return styleMouseMove;
      }
      return styleDefault;
    }
    

Vollständiges Codebeispiel

TypeScript

let map: google.maps.Map;
let featureLayer;
let infoWindow;
let lastInteractedFeatureIds = [];
let lastClickedFeatureIds = [];

function handleClick(/* MouseEvent */ e) {
  lastClickedFeatureIds = e.features.map(f => f.placeId);
  lastInteractedFeatureIds = [];
  featureLayer.style = applyStyle;
  createInfoWindow(e);
}

function handleMouseMove(/* MouseEvent */ e) {
  lastInteractedFeatureIds = e.features.map(f => f.placeId);
  featureLayer.style = applyStyle;
}

async function initMap() {
  // Request needed libraries.
  const { Map, InfoWindow } = await google.maps.importLibrary('maps') as google.maps.MapsLibrary;

  map = new Map(document.getElementById('map') as HTMLElement, {
    center: {lat: 39.23, lng: -105.73},
    zoom: 8,
    // In the cloud console, configure your Map ID with a style that enables the
    // 'Administrative Area Level 2' Data Driven Styling type.
    mapId: 'a3efe1c035bad51b', // Substitute your own map ID.
    mapTypeControl: false,
  });

  // Add the feature layer.
  //@ts-ignore
  featureLayer = map.getFeatureLayer('ADMINISTRATIVE_AREA_LEVEL_2');

  // Add the event listeners for the feature layer.
  featureLayer.addListener('click', handleClick);
  featureLayer.addListener('mousemove', handleMouseMove);

  // Map event listener.
  map.addListener('mousemove', () => {
    // If the map gets a mousemove, that means there are no feature layers
    // with listeners registered under the mouse, so we clear the last
    // interacted feature ids.
    if (lastInteractedFeatureIds?.length) {
      lastInteractedFeatureIds = [];
      featureLayer.style = applyStyle;
    }
  });

  // Create the infowindow.
  infoWindow = new InfoWindow({});
  // Apply style on load, to enable clicking.
  featureLayer.style = applyStyle;
}

// Helper function for the infowindow.
async function createInfoWindow(event) {
  let feature = event.features[0];
  if (!feature.placeId) return;

  // Update the infowindow.
  const place = await feature.fetchPlace();
  let content =
      '<span style="font-size:small">Display name: ' + place.displayName +
      '<br/> Place ID: ' + feature.placeId +
      '<br/> Feature type: ' + feature.featureType + '</span>';

  updateInfoWindow(content, event.latLng);
}

// Define styles.
// Stroke and fill with minimum opacity value.
const styleDefault = {
  strokeColor: '#810FCB',
  strokeOpacity: 1.0,
  strokeWeight: 2.0,
  fillColor: 'white',
  fillOpacity: 0.1,  // Polygons must be visible to receive events.
};
// Style for the clicked polygon.
const styleClicked = {
  ...styleDefault,
  fillColor: '#810FCB',
  fillOpacity: 0.5,
};
// Style for polygon on mouse move.
const styleMouseMove = {
  ...styleDefault,
  strokeWeight: 4.0,
};

// Apply styles using a feature style function.
function applyStyle(/* FeatureStyleFunctionOptions */ params) {
  const placeId = params.feature.placeId;
  //@ts-ignore
  if (lastClickedFeatureIds.includes(placeId)) {
    return styleClicked;
  }
  //@ts-ignore
  if (lastInteractedFeatureIds.includes(placeId)) {
    return styleMouseMove;
  }
  return styleDefault;
}

// Helper function to create an info window.
function updateInfoWindow(content, center) {
  infoWindow.setContent(content);
  infoWindow.setPosition(center);
  infoWindow.open({
    map,
    shouldFocus: false,
  });
}

initMap();

JavaScript

let map;
let featureLayer;
let infoWindow;
let lastInteractedFeatureIds = [];
let lastClickedFeatureIds = [];

function handleClick(/* MouseEvent */ e) {
  lastClickedFeatureIds = e.features.map((f) => f.placeId);
  lastInteractedFeatureIds = [];
  featureLayer.style = applyStyle;
  createInfoWindow(e);
}

function handleMouseMove(/* MouseEvent */ e) {
  lastInteractedFeatureIds = e.features.map((f) => f.placeId);
  featureLayer.style = applyStyle;
}

async function initMap() {
  // Request needed libraries.
  const { Map, InfoWindow } = await google.maps.importLibrary("maps");

  map = new Map(document.getElementById("map"), {
    center: { lat: 39.23, lng: -105.73 },
    zoom: 8,
    // In the cloud console, configure your Map ID with a style that enables the
    // 'Administrative Area Level 2' Data Driven Styling type.
    mapId: "a3efe1c035bad51b", // Substitute your own map ID.
    mapTypeControl: false,
  });
  // Add the feature layer.
  //@ts-ignore
  featureLayer = map.getFeatureLayer("ADMINISTRATIVE_AREA_LEVEL_2");
  // Add the event listeners for the feature layer.
  featureLayer.addListener("click", handleClick);
  featureLayer.addListener("mousemove", handleMouseMove);
  // Map event listener.
  map.addListener("mousemove", () => {
    // If the map gets a mousemove, that means there are no feature layers
    // with listeners registered under the mouse, so we clear the last
    // interacted feature ids.
    if (lastInteractedFeatureIds?.length) {
      lastInteractedFeatureIds = [];
      featureLayer.style = applyStyle;
    }
  });
  // Create the infowindow.
  infoWindow = new InfoWindow({});
  // Apply style on load, to enable clicking.
  featureLayer.style = applyStyle;
}

// Helper function for the infowindow.
async function createInfoWindow(event) {
  let feature = event.features[0];

  if (!feature.placeId) return;

  // Update the infowindow.
  const place = await feature.fetchPlace();
  let content =
    '<span style="font-size:small">Display name: ' +
    place.displayName +
    "<br/> Place ID: " +
    feature.placeId +
    "<br/> Feature type: " +
    feature.featureType +
    "</span>";

  updateInfoWindow(content, event.latLng);
}

// Define styles.
// Stroke and fill with minimum opacity value.
const styleDefault = {
  strokeColor: "#810FCB",
  strokeOpacity: 1.0,
  strokeWeight: 2.0,
  fillColor: "white",
  fillOpacity: 0.1, // Polygons must be visible to receive events.
};
// Style for the clicked polygon.
const styleClicked = {
  ...styleDefault,
  fillColor: "#810FCB",
  fillOpacity: 0.5,
};
// Style for polygon on mouse move.
const styleMouseMove = {
  ...styleDefault,
  strokeWeight: 4.0,
};

// Apply styles using a feature style function.
function applyStyle(/* FeatureStyleFunctionOptions */ params) {
  const placeId = params.feature.placeId;

  //@ts-ignore
  if (lastClickedFeatureIds.includes(placeId)) {
    return styleClicked;
  }

  //@ts-ignore
  if (lastInteractedFeatureIds.includes(placeId)) {
    return styleMouseMove;
  }
  return styleDefault;
}

// Helper function to create an info window.
function updateInfoWindow(content, center) {
  infoWindow.setContent(content);
  infoWindow.setPosition(center);
  infoWindow.open({
    map,
    shouldFocus: false,
  });
}

initMap();

CSS

/* 
 * 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;
}

HTML

<html>
  <head>
    <title>Handle Region Boundary Click Event</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- prettier-ignore -->
    <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
  </body>
</html>

Testbeispiel

Weitere Informationen zu Ereignissen