Gérer les événements de souris

Sélectionnez une plate-forme : iOS JavaScript

Présentation

Configurer un calque d'éléments géographiques pour qu'il réponde aux événements mousemove et click, et utiliser pour renvoyer des informations sur la limite sur laquelle l'utilisateur a cliqué. Ces informations inclut l'ID, le nom à afficher et le type de fonctionnalité. L'exemple de carte suivant montre pour la Région administrative de niveau 2, et comporte un code de gestion des événements Appliquer un style aux polygones en fonction des interactions des utilisateurs (mousemove modifie la bordure l'épaisseur, click nuance la couleur de l'arrière-plan et fait apparaître une fenêtre d'informations display).

Activer les événements du calque d'éléments géographiques

Pour activer les événements sur un calque d'éléments géographiques, procédez comme suit :

1. Enregistrez un calque d'éléments géographiques pour les notifications d'événements en appelant la méthode addListener() sur le calque d'éléments pour chaque événement que vous souhaitez registre. Dans cet exemple, la carte dispose également d'un écouteur.

   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;
     }
   });
   index.ts

   Remarque : Consultez ce guide sur l'utilisation de TypeScript et Google Maps.

   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;
     }
   });
   index.js

2. Ajoutez le code du gestionnaire d'événements pour styliser le polygone sélectionné en fonction du type de d'interaction.

   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;
   }
   index.ts

   Remarque : Consultez ce guide sur l'utilisation de TypeScript et Google Maps.

   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;
   }
   index.js

3. Utilisez une fonction de style d'éléments géographiques pour appliquer des styles. Fonction de style d'éléments géographiques applique de manière conditionnelle un style basé sur le type d'interaction. Trois sont définis ici: un pour mettre la bordure en gras sur mousemove, un pour modifier l'arrière-plan et afficher une fenêtre d'informations sur click ainsi qu'un style par défaut.

   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;
   }
   index.ts

   Remarque : Consultez ce guide sur l'utilisation de TypeScript et Google Maps.

   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;
   }
   index.js

Remarque :Étant donné qu'il est possible d'interagir avec les éléments visibles uniquement, le remplissage par défaut ce style doit avoir une fillOpacity de 0,1 ou plus.

Exemple de code complet

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();
index.ts

Remarque : Consultez ce guide sur l'utilisation de TypeScript et Google Maps.

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();
index.js

Remarque : Le code JavaScript est compilé à partir de l'extrait TypeScript.

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;
}
style.css

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>
index.html

Essayer avec un exemple

JSFiddle.net Google Cloud Shell

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