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How to use JS and Amap to implement location positioning function

王林
王林Original
2023-11-21 12:16:001507browse

How to use JS and Amap to implement location positioning function

How to use JS and Amap to implement the location positioning function

1. Introduction
With the development of the Internet, the map positioning function has become an integral part of many websites and applications Essential features of the program. Today we will introduce how to use JS and Amap API to implement location positioning function. This article will explain in detail the preparation work, obtaining the Amap API key, creating a map, adding markers, adding information windows, and locating the user's location, and provide relevant code examples.

2. Preparation work
Before starting, we need to ensure that we have the following preparation work:

  1. A valid Amap developer account, and the application has been created.
  2. A browser-enabled text editor such as Sublime Text or Visual Studio Code.
  3. Basic knowledge of HTML, CSS and JavaScript.

3. Obtain the AMAP API key

  1. Open the official Amap developer website (https://lbs.amap.com/), log in or register an account .
  2. Create a new application and select the Web service type.
  3. On the application details page, find the "Developer Key" column and copy the generated API key.

4. Create a map

  1. In the HTML file where you need to add a map, add the following code: 

    <!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <title>地点定位</title>
 <style type="text/css">
     #map{
         width: 800px;
         height: 500px;
     }
 </style>
</head>
<body>
 <div id="map"></div>
</body>
</html>

  2. In your JavaScript file, add the following code (introducing the API of Amap): 

    <script src="https://webapi.amap.com/maps?v=1.4.15&key=你的API密钥"></script>

  3. In your JavaScript file, add the following code (create the map): 

    var map = new AMap.Map('map',{
 center: [经度, 纬度],
 zoom: 缩放级别
});

    Among them, [longitude, latitude] represents the center point of the map, and the zoom level determines the display level of the map.

5. Add tags

  1. In the JavaScript file, add the following code (create tags): 

    var marker = new AMap.Marker({
 position: [经度, 纬度]
});
marker.setMap(map);

    Among them, [Longitude, Latitude] represents the location of the marker.

6. Add information window

  1. In the JavaScript file, add the following code (create information window):

    var infoWindow = new AMap.InfoWindow({
 content: '这里是信息窗口的内容'
});

  2. In the event that needs to trigger the information window, add the following code: 

    marker.on('click', function(){
 infoWindow.open(map, marker.getPosition());
});

7. Locate the user location

  1. In In the JavaScript file, add the following code (locating the user's location): 

    AMap.plugin('AMap.Geolocation', function() {
 var geolocation = new AMap.Geolocation({
     enableHighAccuracy: true, // 是否使用高精度定位，默认为false
     timeout: 10000, // 超过10秒后停止定位，默认为无穷大
     maximumAge: 0, // 定位结果缓存0毫秒，默认值为0
     convert: true, // 自动偏移坐标是否转换，默认为true
     showButton: true, // 显示定位按钮，默认为true
     buttonPosition: 'LB', // 定位按钮停靠位置，默认为'LB'，左下角
     buttonOffset: new AMap.Pixel(10, 20), // 定位按钮的偏移量，默认为Pixel(10, 20)
     showMarker: true, // 定位成功后在定位到的位置显示点标记，默认为true
     showCircle: true, // 定位成功后用圆圈表示定位精度范围，默认为true
     panToLocation: true, // 定位成功后将定位到的位置作为地图中心点，默认为true
     zoomToAccuracy:true // 定位成功后将定位精度范围显示在地图上，默认为true
 });
 map.addControl(geolocation);
 geolocation.getCurrentPosition();
 AMap.event.addListener(geolocation, 'complete', onComplete);
 AMap.event.addListener(geolocation, 'error', onError);
});
function onComplete(data) {
 var lnglat = data.position;
 var marker = new AMap.Marker({
     position: lnglat
 });
 marker.setMap(map);
}
function onError(error) {
 console.log('定位失败');
}

8. Summary
Through the introduction of this article, we have learned how to use JS and Amap API to implement locations GPS. We learned about the preparation work, obtaining the Amap API key, creating a map, adding markers, adding information windows, and locating the user's location, and provided corresponding code examples. I believe readers can easily implement the location positioning function based on the content provided in this article. I hope this article is helpful to you, thank you for reading!

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