How to use jquery to implement map positioning-Front-end Q&A-php.cn

How to use jquery to implement map positioning

PHPz

Release： 2023-04-17 15:59:50

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With the popularization of mobile Internet, map positioning has become an increasingly popular service and a basic function of many online and mobile applications. As a commonly used JavaScript library, jquery also provides a rich map positioning API. Let's introduce how to use jquery to implement map positioning.

1. Introduction of jquery library and map API

Before using jquery for map positioning, we need to introduce jquery library and map API into the page. Under normal circumstances, we can import it directly from the Internet:

<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<script src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>

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In the above code, we introduced the jquery library and Amap API, and used a key value applied by ourselves for identity verification.

2. Create a map container

Create a container for displaying the map on the page, which can be a div, canvas and other tags, for example:

<div id="mapContainer" style="width: 100%; height: 300px;"></div>

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In the above code, We created a div tag with the id "mapContainer" to display the map, and set the width and height.

3. Initialize the map

After completing the creation of the map container, we need to use jquery to initialize the map. The code is as follows:

var map = new AMap.Map("mapContainer", {
            resizeEnable: true,
            zoom: 10, //设置地图缩放级别
            center: [116.397428, 39.90923] //设置地图中心点坐标
        });

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In the above code, we use AMap. The Map() function initializes the map and performs some configurations, such as setting the zoom level, center point coordinates, etc.

4. Obtain the current location through the browser

After completing the initialization of the map, we need to obtain the location information of the current device, which can be achieved through the API provided by the browser. The code is as follows:

if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(function (position) {
                var longitude = position.coords.longitude; //获取经度
                var latitude = position.coords.latitude; //获取纬度
                var accuracy = position.coords.accuracy; //获取精度
                map.setZoomAndCenter(18, [longitude, latitude]); //设置地图缩放级别和中心坐标
                var marker = new AMap.Marker({
                    position: [longitude, latitude], //设置标记的坐标
                    map: map //设置标记所属的地图对象
                });
            },function (error) {
                switch (error.code) {
                    case 1:
                        console.log("位置服务被拒绝");
                        break;
                    case 2:
                        console.log("暂时获取不到位置信息");
                        break;
                    case 3:
                        console.log("获取信息超时");
                        break;
                    case 4:
                        console.log("未知错误");
                        break;
                }
            });
        }

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In the above code, we determine whether the browser supports obtaining geographical location information. If supported, we obtain the longitude, latitude, accuracy and other information of the current location through the getCurrentPosition() function, and set the center coordinates and markers of the map through the setZoomAndCenter() function and AMap.Marker() function.

5. The complete code for map positioning

The following is the complete code for jquery to implement map positioning:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>jquery实现地图定位</title>
    <style type="text/css">
        #mapContainer{
            width: 100%;
            height: 300px;
        }
    </style>
</head>
<body>
    <div id="mapContainer"></div>

    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <script src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
    <script>
        $(function () {
            //初始化地图
            var map = new AMap.Map("mapContainer", {
                resizeEnable: true,
                zoom: 10,
                center: [116.397428, 39.90923]
            });

            //获取当前位置
            if (navigator.geolocation) {
                navigator.geolocation.getCurrentPosition(function (position) {
                    var longitude = position.coords.longitude; //获取经度
                    var latitude = position.coords.latitude; //获取纬度
                    var accuracy = position.coords.accuracy; //获取精度
                    map.setZoomAndCenter(18, [longitude, latitude]); //设置地图缩放级别和中心坐标
                    var marker = new AMap.Marker({
                        position: [longitude, latitude],
                        map: map
                    });
                },function (error) {
                    switch (error.code) {
                        case 1:
                            console.log("位置服务被拒绝");
                            break;
                        case 2:
                            console.log("暂时获取不到位置信息");
                            break;
                        case 3:
                            console.log("获取信息超时");
                            break;
                        case 4:
                            console.log("未知错误");
                            break;
                    }
                });
            }
        });
    </script>
</body>
</html>

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6. Conclusion

This article introduces how to use The method and code for implementing map positioning in jquery, I hope it will be helpful to everyone in your study or work. Of course, the map positioning API provided by jquery is far more than this. It has more and richer functions. You can learn more about it by viewing the jquery official documentation.

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