使标记可点击且可访问

您可以通过启用点击事件处理、添加 以及调整标记的缩放比例。

  • 当标记可点击（或可拖动）时，它可以响应键盘和 鼠标输入。
  • title 选项中指定的文本可由屏幕阅读器读取， 当用户将鼠标指针悬停在标记上时显示。
  • 增大标记的尺寸后，在所有设备（尤其是触摸屏设备）上与之交互时就不需要那么大的精度，同时无障碍体验也更好。默认标记符合 WCAG AA 最小尺寸 但适用于希望达到 WCAG AAA 目标规模的开发者 应增大标记大小。

如需了解如何更改标记，请参阅自定义基本标记 缩放、添加标题文字等。

以下示例显示了一个地图，其中包含五个可点击且可聚焦的标记， 包括标题文字，并已设置为 1.5 倍：

要使用键盘在标记间导航，请按以下说明操作：

  1. 使用 Tab 键将焦点移至第一个标记；如果同一地图上有多个标记，可使用箭头键在标记之间循环切换。
  2. 如果标记可点击，按 Enter 键即可“点击”它。如果某个标记有信息窗口，您可以点击该标记或者按 Enter 键或空格键打开其信息窗口。关闭信息窗口后，焦点将返回到关联的标记。
  3. 再按一次 Tab 键，即可继续在其余地图控件之间移动。

将标记设置为可点击

本部分介绍了如何让标记响应点击事件。 如需将标记设为可点击，请执行以下操作：

  • 将 gmpClickable 属性设置为 true。

TypeScript

const marker = new AdvancedMarkerElement({
    position,
    map,
    title: `${i + 1}. ${title}`,
    content: pin.element,
    gmpClickable: true,
});
index.ts

JavaScript

const marker = new AdvancedMarkerElement({
  position,
  map,
  title: `${i + 1}. ${title}`,
  content: pin.element,
  gmpClickable: true,
});

index.js

  • 添加点击事件监听器以响应用户输入。

TypeScript

// Add a click listener for each marker, and set up the info window.
marker.addListener('click', ({ domEvent, latLng }) => {
    const { target } = domEvent;
    infoWindow.close();
    infoWindow.setContent(marker.title);
    infoWindow.open(marker.map, marker);
});
index.ts

JavaScript

// Add a click listener for each marker, and set up the info window.
marker.addListener("click", ({ domEvent, latLng }) => {
  const { target } = domEvent;

  infoWindow.close();
  infoWindow.setContent(marker.title);
  infoWindow.open(marker.map, marker);
});
index.js

  • 若要使标记不再可点击，请调用 removeListener 以移除点击 事件监听器：

    // Remove the listener.
google.maps.event.removeListener(clickListener);

如需进一步增强无障碍功能，请执行以下操作：

  • 使用 AdvancedMarkerElement.title 为标记设置描述性文本 选项。
  • 使用 PinElement 的 scale 属性增大标记的缩放比例。

完整示例代码

查看完整的示例源代码

TypeScript

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

    const map = new Map(document.getElementById("map") as HTMLElement, {
        zoom: 12,
        center: { lat: 34.84555, lng: -111.8035 },
        mapId: '4504f8b37365c3d0',
    });

    // Set LatLng and title text for the markers. The first marker (Boynton Pass)
    // receives the initial focus when tab is pressed. Use arrow keys to move
    // between markers; press tab again to cycle through the map controls.
    const tourStops = [
        {
            position: { lat: 34.8791806, lng: -111.8265049 }, 
            title: "Boynton Pass"
        },
        {
            position: { lat: 34.8559195, lng: -111.7988186 }, 
            title: "Airport Mesa"
        },
        {
            position: { lat: 34.832149, lng: -111.7695277 }, 
            title: "Chapel of the Holy Cross"
        },
        {
            position: { lat: 34.823736, lng: -111.8001857 }, 
            title: "Red Rock Crossing"
        },
        {
            position: { lat: 34.800326, lng: -111.7665047 }, 
            title: "Bell Rock"
        },
    ];

    // Create an info window to share between markers.
    const infoWindow = new InfoWindow();

    // Create the markers.
    tourStops.forEach(({position, title}, i) => {
        const pin = new PinElement({
            glyph: `${i + 1}`,
            scale: 1.5,
        });
        const marker = new AdvancedMarkerElement({
            position,
            map,
            title: `${i + 1}. ${title}`,
            content: pin.element,
            gmpClickable: true,
        });
        // Add a click listener for each marker, and set up the info window.
        marker.addListener('click', ({ domEvent, latLng }) => {
            const { target } = domEvent;
            infoWindow.close();
            infoWindow.setContent(marker.title);
            infoWindow.open(marker.map, marker);
        });
    });
}

initMap();
index.ts

JavaScript

async function initMap() {
  // Request needed libraries.
  const { Map, InfoWindow } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement, PinElement } = await google.maps.importLibrary(
    "marker",
  );
  const map = new Map(document.getElementById("map"), {
    zoom: 12,
    center: { lat: 34.84555, lng: -111.8035 },
    mapId: "4504f8b37365c3d0",
  });
  // Set LatLng and title text for the markers. The first marker (Boynton Pass)
  // receives the initial focus when tab is pressed. Use arrow keys to move
  // between markers; press tab again to cycle through the map controls.
  const tourStops = [
    {
      position: { lat: 34.8791806, lng: -111.8265049 },
      title: "Boynton Pass",
    },
    {
      position: { lat: 34.8559195, lng: -111.7988186 },
      title: "Airport Mesa",
    },
    {
      position: { lat: 34.832149, lng: -111.7695277 },
      title: "Chapel of the Holy Cross",
    },
    {
      position: { lat: 34.823736, lng: -111.8001857 },
      title: "Red Rock Crossing",
    },
    {
      position: { lat: 34.800326, lng: -111.7665047 },
      title: "Bell Rock",
    },
  ];
  // Create an info window to share between markers.
  const infoWindow = new InfoWindow();

  // Create the markers.
  tourStops.forEach(({ position, title }, i) => {
    const pin = new PinElement({
      glyph: `${i + 1}`,
      scale: 1.5,
    });
    const marker = new AdvancedMarkerElement({
      position,
      map,
      title: `${i + 1}. ${title}`,
      content: pin.element,
      gmpClickable: true,
    });

    // Add a click listener for each marker, and set up the info window.
    marker.addListener("click", ({ domEvent, latLng }) => {
      const { target } = domEvent;

      infoWindow.close();
      infoWindow.setContent(marker.title);
      infoWindow.open(marker.map, marker);
    });
  });
}

initMap();
index.js

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>Advanced Marker Accessibility</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: "beta"});</script>
  </body>
</html>
index.html

试用示例