How to use JS and Baidu Maps to implement map route navigation function

How to use JS and Baidu Maps to implement map route navigation function

With the continuous advancement of technology, map navigation function has become an indispensable part of our lives. And how to implement the map route navigation function in the web page? This article will introduce how to use JS and Baidu Map API to implement this function, and provide specific code examples.

Step 1: Obtain the Baidu Map API key

First, we need to apply for and obtain the Baidu Map API key. Apply for a developer account on the official website of Baidu Map Open Platform and create an application. After successful creation, you will get a unique API key, which will be used to call Baidu Maps API interface.

Step 2: Introduce Baidu Map API and related JS files

Introduce the JS files of Baidu Map API and related JS files in the

tag of the HTML file, for example:

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=你的API密钥"></script>
<script type="text/javascript" src="http://api.map.baidu.com/library/TextIconOverlay/1.2/src/TextIconOverlay_min.js"></script>

Step 3: Create a map container

Create a DIV container within the

tag of the HTML file to host the map. For example:

<div id="mapContainer"></div>

Step 4: Initialize the map and display

Use the Map class of Baidu Map API in the JS file to initialize the map and display it in the map container on the page. For example:

var map = new BMap.Map("mapContainer"); // 创建地图实例
var point = new BMap.Point(116.404, 39.915); // 创建一个中心点坐标
map.centerAndZoom(point, 15); // 初始化地图，设置中心点坐标和缩放级别
map.enableScrollWheelZoom(true); // 开启鼠标滚轮缩放功能

At this point, you should be able to see an area showing a map in your browser.

Step 5: Add navigation control

Use the NavigationControl class of Baidu Map API to add a navigation control to support the zoom and pan operations of the map. For example:

var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);

Step 6: Add starting and ending points

Use the Marker class of Baidu Map API to add starting and ending points to display the locations of the starting and ending points. For example:

var startMarker = new BMap.Marker(new BMap.Point(116.404, 39.915)); // 创建起点标注
var endMarker = new BMap.Marker(new BMap.Point(116.434, 39.908)); // 创建终点标注
map.addOverlay(startMarker); // 添加起点标注到地图上
map.addOverlay(endMarker); // 添加终点标注到地图上

Step 7: Add route planning

Use the DrivingRoute class of Baidu Map API to plan the driving route and display it on the map. For example:

var driving = new BMap.DrivingRoute(map, { renderOptions: { map: map, autoViewport: true } });
driving.search("起点", "终点");

Step 8: Add a control

Use the GeolocationControl class of Baidu Map API to add a positioning control to locate the current user's location. For example:

var geolocationControl = new BMap.GeolocationControl();
map.addControl(geolocationControl);

Step 9: Improve the interaction logic

Add some interaction logic, such as clicking on the start and end points to pop up information windows, etc. For example:

startMarker.addEventListener("click", function () {
  var infoWindow = new BMap.InfoWindow("这是起点");
  this.openInfoWindow(infoWindow);
});

endMarker.addEventListener("click", function () {
  var infoWindow = new BMap.InfoWindow("这是终点");
  this.openInfoWindow(infoWindow);
});

After all the above steps, you can implement the map route navigation function in the web page. Of course, the above code is just a simple example and you can expand and optimize it according to actual needs. Hope this article is helpful to you!

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