माउस इवेंट मैनेज करना

डेटा सुविधाओं को mousemove और click इवेंट का जवाब देना और उनका इस्तेमाल इन कामों के लिए करना उपयोगकर्ता इंटरैक्शन के आधार पर किसी सुविधा के दिखने का तरीका बदल सकें.

डेटासेट लेयर इवेंट की सुविधा चालू करें

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

  1. इवेंट की सूचनाओं के लिए, हर उस इवेंट के लिए डेटासेट लेयर पर addListener() फ़ंक्शन जोड़ें जिसे आपको जोड़ना है रजिस्टर करें. इस उदाहरण में, मैप को भी लिसनर माना जाता है.

    TypeScript

    datasetLayer = map.getDatasetFeatureLayer(datasetId);
    datasetLayer.style = applyStyle;
    
    datasetLayer.addListener('click', handleClick);
    datasetLayer.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 = [];
        datasetLayer.style = applyStyle;
      }
    });

    JavaScript

    datasetLayer = map.getDatasetFeatureLayer(datasetId);
    datasetLayer.style = applyStyle;
    datasetLayer.addListener("click", handleClick);
    datasetLayer.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 = [];
        datasetLayer.style = applyStyle;
      }
    });
    

  2. चुनी गई सुविधा को स्टाइल देने के लिए, इवेंट हैंडलर कोड जोड़ें इंटरैक्शन.

    TypeScript

    // Note, 'globalid' is an attribute in this Dataset.
    function handleClick(/* MouseEvent */ e) {
      if (e.features) {
        lastClickedFeatureIds =
            e.features.map((f) => f.datasetAttributes['globalid']);
      }
      //@ts-ignore
      datasetLayer.style = applyStyle;
    }
    
    function handleMouseMove(/* MouseEvent */ e) {
      if (e.features) {
        lastInteractedFeatureIds =
            e.features.map((f) => f.datasetAttributes['globalid']);
      }
      //@ts-ignore
      datasetLayer.style = applyStyle;
    }

    JavaScript

    // Note, 'globalid' is an attribute in this Dataset.
    function handleClick(/* MouseEvent */ e) {
      if (e.features) {
        lastClickedFeatureIds = e.features.map(
          (f) => f.datasetAttributes["globalid"],
        );
      }
    
      //@ts-ignore
      datasetLayer.style = applyStyle;
    }
    
    function handleMouseMove(/* MouseEvent */ e) {
      if (e.features) {
        lastInteractedFeatureIds = e.features.map(
          (f) => f.datasetAttributes["globalid"],
        );
      }
    
      //@ts-ignore
      datasetLayer.style = applyStyle;
    }
    

  3. स्टाइल लागू करने के लिए फ़ीचर स्टाइल फ़ंक्शन का इस्तेमाल करें. फ़ीचर स्टाइल फ़ंक्शन यहां दिखाई गई स्टाइल, इंटरैक्शन के टाइप के आधार पर शर्तों के साथ लागू होती है. तीन बार स्टाइल के बारे में यहां बताया गया है: पहला, mousemove पर बॉर्डर को बोल्ड करने के लिए, दूसरे को बोल्ड करने के लिए click की बैकग्राउंड और डिफ़ॉल्ट स्टाइल बदली जा सकती है.

    TypeScript

    const styleDefault = {
      strokeColor: 'green',
      strokeWeight: 2.0,
      strokeOpacity: 1.0,
      fillColor: 'green',
      fillOpacity: 0.3,
    };
    
    const styleClicked = {
      ...styleDefault,
      strokeColor: 'blue',
      fillColor: 'blue',
      fillOpacity: 0.5,
    };
    
    const styleMouseMove = {
       ...styleDefault,
      strokeWeight: 4.0
    };
    
    function applyStyle(/* FeatureStyleFunctionOptions */ params) {
      const datasetFeature = params.feature;
      // Note, 'globalid' is an attribute in this dataset.
      //@ts-ignore
      if (lastClickedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) {
        return styleClicked;
      }
      //@ts-ignore
      if (lastInteractedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) {
        return styleMouseMove;
      }
      return styleDefault;
    }

    JavaScript

    const styleDefault = {
      strokeColor: "green",
      strokeWeight: 2.0,
      strokeOpacity: 1.0,
      fillColor: "green",
      fillOpacity: 0.3,
    };
    const styleClicked = {
      ...styleDefault,
      strokeColor: "blue",
      fillColor: "blue",
      fillOpacity: 0.5,
    };
    const styleMouseMove = {
      ...styleDefault,
      strokeWeight: 4.0,
    };
    
    function applyStyle(/* FeatureStyleFunctionOptions */ params) {
      const datasetFeature = params.feature;
    
      // Note, 'globalid' is an attribute in this dataset.
      //@ts-ignore
      if (
        lastClickedFeatureIds.includes(datasetFeature.datasetAttributes["globalid"])
      ) {
        return styleClicked;
      }
    
      //@ts-ignore
      if (
        lastInteractedFeatureIds.includes(
          datasetFeature.datasetAttributes["globalid"],
        )
      ) {
        return styleMouseMove;
      }
      return styleDefault;
    }
    

उदाहरण के तौर पर दिए गए कोड को पूरा करें

TypeScript

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

// Note, 'globalid' is an attribute in this Dataset.
function handleClick(/* MouseEvent */ e) {
  if (e.features) {
    lastClickedFeatureIds =
        e.features.map((f) => f.datasetAttributes['globalid']);
  }
  //@ts-ignore
  datasetLayer.style = applyStyle;
}

function handleMouseMove(/* MouseEvent */ e) {
  if (e.features) {
    lastInteractedFeatureIds =
        e.features.map((f) => f.datasetAttributes['globalid']);
  }
  //@ts-ignore
  datasetLayer.style = applyStyle;
}

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

  const position = {lat: 40.780101, lng: -73.967780};
  map = new Map(document.getElementById('map') as HTMLElement, {
    zoom: 13,
    center: position,
    mapId: 'b98e588c46685dd7',
    mapTypeControl: false,
  });

  // Dataset ID for NYC park data.
  const datasetId = '6fe13aa9-b900-45e7-b636-3236672c3f4f';

  //@ts-ignore
  datasetLayer = map.getDatasetFeatureLayer(datasetId);
  datasetLayer.style = applyStyle;

  datasetLayer.addListener('click', handleClick);
  datasetLayer.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 = [];
      datasetLayer.style = applyStyle;
    }
  });
  const attributionDiv = document.createElement('div');
  const attributionControl = createAttribution(map);

  attributionDiv.appendChild(attributionControl);
  map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv);
}

const styleDefault = {
  strokeColor: 'green',
  strokeWeight: 2.0,
  strokeOpacity: 1.0,
  fillColor: 'green',
  fillOpacity: 0.3,
};

const styleClicked = {
  ...styleDefault,
  strokeColor: 'blue',
  fillColor: 'blue',
  fillOpacity: 0.5,
};

const styleMouseMove = {
   ...styleDefault,
  strokeWeight: 4.0
};

function applyStyle(/* FeatureStyleFunctionOptions */ params) {
  const datasetFeature = params.feature;
  // Note, 'globalid' is an attribute in this dataset.
  //@ts-ignore
  if (lastClickedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) {
    return styleClicked;
  }
  //@ts-ignore
  if (lastInteractedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) {
    return styleMouseMove;
  }
  return styleDefault;
}

function createAttribution(map) {
  const attributionLabel = document.createElement('div');

  // Define CSS styles.
  attributionLabel.style.backgroundColor = '#fff';
  attributionLabel.style.opacity = '0.7';
  attributionLabel.style.fontFamily = 'Roboto,Arial,sans-serif';
  attributionLabel.style.fontSize = '10px';
  attributionLabel.style.padding = '2px';
  attributionLabel.style.margin = '2px';
  attributionLabel.textContent = 'Data source: NYC Open Data';
  return attributionLabel;
}

initMap();

JavaScript

let map;
let lastInteractedFeatureIds = [];
let lastClickedFeatureIds = [];
let datasetLayer;

// Note, 'globalid' is an attribute in this Dataset.
function handleClick(/* MouseEvent */ e) {
  if (e.features) {
    lastClickedFeatureIds = e.features.map(
      (f) => f.datasetAttributes["globalid"],
    );
  }

  //@ts-ignore
  datasetLayer.style = applyStyle;
}

function handleMouseMove(/* MouseEvent */ e) {
  if (e.features) {
    lastInteractedFeatureIds = e.features.map(
      (f) => f.datasetAttributes["globalid"],
    );
  }

  //@ts-ignore
  datasetLayer.style = applyStyle;
}

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps");
  const position = { lat: 40.780101, lng: -73.96778 };

  map = new Map(document.getElementById("map"), {
    zoom: 13,
    center: position,
    mapId: "b98e588c46685dd7",
    mapTypeControl: false,
  });

  // Dataset ID for NYC park data.
  const datasetId = "6fe13aa9-b900-45e7-b636-3236672c3f4f";

  //@ts-ignore
  datasetLayer = map.getDatasetFeatureLayer(datasetId);
  datasetLayer.style = applyStyle;
  datasetLayer.addListener("click", handleClick);
  datasetLayer.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 = [];
      datasetLayer.style = applyStyle;
    }
  });

  const attributionDiv = document.createElement("div");
  const attributionControl = createAttribution(map);

  attributionDiv.appendChild(attributionControl);
  map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv);
}

const styleDefault = {
  strokeColor: "green",
  strokeWeight: 2.0,
  strokeOpacity: 1.0,
  fillColor: "green",
  fillOpacity: 0.3,
};
const styleClicked = {
  ...styleDefault,
  strokeColor: "blue",
  fillColor: "blue",
  fillOpacity: 0.5,
};
const styleMouseMove = {
  ...styleDefault,
  strokeWeight: 4.0,
};

function applyStyle(/* FeatureStyleFunctionOptions */ params) {
  const datasetFeature = params.feature;

  // Note, 'globalid' is an attribute in this dataset.
  //@ts-ignore
  if (
    lastClickedFeatureIds.includes(datasetFeature.datasetAttributes["globalid"])
  ) {
    return styleClicked;
  }

  //@ts-ignore
  if (
    lastInteractedFeatureIds.includes(
      datasetFeature.datasetAttributes["globalid"],
    )
  ) {
    return styleMouseMove;
  }
  return styleDefault;
}

function createAttribution(map) {
  const attributionLabel = document.createElement("div");

  // Define CSS styles.
  attributionLabel.style.backgroundColor = "#fff";
  attributionLabel.style.opacity = "0.7";
  attributionLabel.style.fontFamily = "Roboto,Arial,sans-serif";
  attributionLabel.style.fontSize = "10px";
  attributionLabel.style.padding = "2px";
  attributionLabel.style.margin = "2px";
  attributionLabel.textContent = "Data source: NYC Open Data";
  return attributionLabel;
}

initMap();