माउस इवेंट मैनेज करना

प्लैटफ़ॉर्म चुनें: Android iOS JavaScript

खास जानकारी

किसी फ़ीचर लेयर को mousemove और click इवेंट के हिसाब से जवाब देने के लिए सेट करें. साथ ही, क्लिक की गई सीमा के बारे में जानकारी देने के लिए, उनका इस्तेमाल करें. इस जानकारी में, आईडी, डिसप्ले नेम, और फ़ीचर टाइप शामिल होता है. यहां दिए गए उदाहरण के मैप में, एडमिनिस्ट्रेटिव एरिया लेवल 2 की सीमाएं दिखाई गई हैं. साथ ही, इसमें इवेंट हैंडल करने वाला कोड है, जो उपयोगकर्ता के इंटरैक्शन के आधार पर पॉलीगॉन को स्टाइल करता है. जैसे, mousemove बॉर्डर की चौड़ाई बदलता है, click बैकग्राउंड का रंग गहरे रंग में बदलता है, और जानकारी वाला विंडो दिखाता है.

फीचर लेयर इवेंट चालू करना

किसी फीचर लेयर पर इवेंट चालू करने के लिए, यह तरीका अपनाएं:

  1. आपको जिस इवेंट को रजिस्टर करना है उसके लिए, addListener() फ़ंक्शन को कॉल करके, इवेंट की सूचनाओं के लिए फ़ीचर लेयर रजिस्टर करें. इस उदाहरण में, मैप को भी एक दर्शक मिलता है.

    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. चुने गए पॉलीगॉन को इंटरैक्शन के टाइप के आधार पर स्टाइल करने के लिए, इवेंट हैंडलर कोड जोड़ें.

    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. स्टाइल लागू करने के लिए, फ़ीचर स्टाइल फ़ंक्शन का इस्तेमाल करें. यहां दिखाया गया फ़ीचर स्टाइल फ़ंक्शन, इंटरैक्शन के टाइप के आधार पर स्टाइल को कंडीशन के हिसाब से लागू करता है. यहां तीन स्टाइल तय किए गए हैं: पहला, mousemove पर बॉर्डर को बोल्ड करने के लिए, दूसरा, click पर बैकग्राउंड बदलने और जानकारी वाला विंडो दिखाने के लिए, और तीसरा डिफ़ॉल्ट स्टाइल.

    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;
    }
    

पूरा कोड का उदाहरण

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();

सीएसएस

/* 
 * 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;
}

एचटीएमएल

<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>

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इवेंट के बारे में ज़्यादा जानें