How to use JS and Amap to implement location traffic query function

How to use JS and Amap to implement the location traffic query function

As urban traffic becomes increasingly congested, understanding real-time traffic information is very important for our travels. This article will introduce how to use JS and Amap API to implement the location traffic query function, and provide specific code examples.

First of all, we need to introduce the API library of Amap. In the HTML file, you can use the following code to introduce the API library:

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

Here, you need to replace your API Key with the one you obtained on the Amap open platform API Key. If you don't have an API Key yet, you can register a developer account on the Amap open platform and create an application to obtain the API Key.

Once we introduce the API library, we can use JS to implement the traffic query function. First, we need to create a map object and display it on the page.

var map = new AMap.Map('mapContainer', {
  zoom: 12,  // 设置地图缩放级别
  center: [116.397428, 39.90923],  // 设置地图中心点坐标
});

Here, mapContainer is the id of a div element used to hold the map. The zoom and center parameters represent the zoom level and center point coordinates of the map respectively.

Next, we can use the search service to query the traffic information of the location. AMAP provides the AMap.Driving class to obtain driving route planning information, including routes and traffic conditions.

var driving = new AMap.Driving({
  map: map,
  panel: 'panel',
});

driving.search([{ keyword: '地点1' }, { keyword: '地点2' }], function (status, result) {
  if (status === 'complete') {
    // 获取路况信息
    var routes = result.routes;
    // 处理路况信息
    // ...
  } else {
    console.log('路线规划失败');
  }
});

Here, the driving.search method receives an array containing multiple location keys, and a callback function. The status parameter in the callback function indicates the status of route planning, and the result parameter is an object containing the query results. By looking for the result.routes attribute, we can get specific traffic information.

After we obtain the traffic information, we can process it, such as drawing a route on the map.

var polyline = new AMap.Polyline({
  path: result.routes[0].path,
  strokeColor: "#3366FF",
  strokeOpacity: 1.0,
  strokeWeight: 6,
  strokeStyle: "solid",
});

polyline.setMap(map);

Here, we create a polyline object and specify the coordinate points of the polyline by setting the path property. We can also set the color, transparency, thickness and style of the polyline. Finally, we add the polyline object to the map.

In addition to drawing routes on the map, we can also display detailed route information on the page through the panel parameter.

<div id="panel"></div>

This HTML code will create a div element with the ID panel to display route information.

The above code provides a basic example of how to use JS and Amap API to implement the location traffic query function. You can further expand and optimize it according to your specific needs.

To sum up, it is not difficult to use JS and Amap to implement the location and traffic query function. With just a few lines of code, you can easily provide real-time traffic information on your website or app, making travel more convenient for users.

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