將標記設為可拖曳

啟用拖曳功能後,使用者就能透過滑鼠或方向鍵在地圖上拖曳標記。如要將標記設計為可拖曳,請將 AdvancedMarkerElement.gmpDraggable 屬性設為 true

下方地圖範例展示一個可拖曳標記,在拖曳完成時會顯示更新後的位置 (觸發 dragend 事件):

如要使用鍵盤拖曳標記:

  1. 持續點按 Tab 鍵,直到焦點移至標記。
  2. 使用方向鍵移至所需的標記。
  3. 如要啟用拖曳功能,在 Mac 上請按下 Option + 空格鍵Option + Enter 鍵,在 Windows 上請按下 Alt + 空格鍵Alt + Enter 鍵
  4. 使用方向鍵即可移動標記。
  5. 如要將標記放在新位置,請按下空格鍵Enter 鍵,這樣也會停用拖曳功能。
  6. 如要停用拖曳功能並將標記移回先前的位置,請按下 Esc 鍵

查看程式碼

TypeScript

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

    const map = new Map(document.getElementById('map') as HTMLElement, {
        center: {lat: 37.39094933041195, lng: -122.02503913145092},
        zoom: 14,
        mapId: '4504f8b37365c3d0',
    });

    const infoWindow = new InfoWindow();

    const draggableMarker = new AdvancedMarkerElement({
        map,
        position: {lat: 37.39094933041195, lng: -122.02503913145092},
        gmpDraggable: true,
        title: "This marker is draggable.",
    });
    draggableMarker.addListener('dragend', (event) => {
        const position = draggableMarker.position as google.maps.LatLng;
        infoWindow.close();
        infoWindow.setContent(`Pin dropped at: ${position.lat}, ${position.lng}`);
        infoWindow.open(draggableMarker.map, draggableMarker);
    });

}

initMap();

JavaScript

async function initMap() {
  // Request needed libraries.
  const { Map, InfoWindow } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");
  const map = new Map(document.getElementById("map"), {
    center: { lat: 37.39094933041195, lng: -122.02503913145092 },
    zoom: 14,
    mapId: "4504f8b37365c3d0",
  });
  const infoWindow = new InfoWindow();
  const draggableMarker = new AdvancedMarkerElement({
    map,
    position: { lat: 37.39094933041195, lng: -122.02503913145092 },
    gmpDraggable: true,
    title: "This marker is draggable.",
  });

  draggableMarker.addListener("dragend", (event) => {
    const position = draggableMarker.position;

    infoWindow.close();
    infoWindow.setContent(`Pin dropped at: ${position.lat}, ${position.lng}`);
    infoWindow.open(draggableMarker.map, draggableMarker);
  });
}

initMap();

設定說明文字

如要設定螢幕閱讀器可讀取的標記說明文字,請使用 AdvancedMarkerElement.title 屬性,如下所示:

    const markerView = new google.maps.marker.AdvancedMarkerElement({
        map,
        position: { lat: 37.4239163, lng: -122.0947209 },
        title: "Some descriptive text.",
    });

設定 title 屬性後,螢幕閱讀器就能讀取文字,滑鼠游標懸停於標記上時也會顯示文字。