


How to use JS and Baidu Maps to implement the map administrative district boundary drawing function
How to use JS and Baidu Maps to implement the map administrative district boundary drawing function, you need specific code examples
Foreword:
In Web development, if you need to Displaying the boundaries of administrative regions can be implemented using JavaScript and Baidu Map API. This article will introduce how to use JS and Baidu Maps to draw administrative district boundaries, and provide specific code examples.
Step 1: Import Baidu Map API
First, import the Baidu Map API script into the HTML page. You can apply for a developer account on the Baidu Map open platform and get your own API key. Then add the following code within the
<script type="text/javascript" src="http://api.map.baidu.com/api?v=3.0&ak=你的API密钥"></script>
In this example, you need to replace "your API key" with your own API key.
Step 2: Create a map container
Create a container for displaying the map in the HTML page. Add the following code within the
<div id="map" style="width: 100%; height: 400px;"></div>
In this example, the map container has an id of "map", a width of 100%, and a height of 400px.
Step 3: Draw administrative district boundaries
Next, implement the function of drawing administrative district boundaries in JavaScript code. Add the following code in the JavaScript code:
// 创建地图实例 var map = new BMap.Map("map"); // 设置地图中心点和缩放级别 var point = new BMap.Point(116.404, 39.915); map.centerAndZoom(point, 12); // 行政区划实例化 var district = new BMap.Boundary(); // 获取行政区域 district.get("北京市", function (rs) { var count = rs.boundaries.length; if (count === 0) { alert("未能获取当前输入行政区域"); return; } var pointArray = []; for (var i = 0; i < count; i++) { var ply = new BMap.Polygon(rs.boundaries[i], { strokeWeight: 2, strokeColor: "#ff0000" }); // 创建多边形 map.addOverlay(ply); // 添加覆盖物 pointArray = pointArray.concat(ply.getPath()); } map.setViewport(pointArray); // 调整视野 })
In this code, we create a map instance and display it in the specified map container. Then, we set the map's center point and zoom level. Next, through the instance of the BMap.Boundary
class, we can get the boundary of the administrative region based on the name of the administrative region. In this example, we obtain the boundaries of "Beijing City" and use red lines to draw the boundaries of the administrative districts.
Finally, we add the drawn borders to the map and adjust the map's view so that all borders are fully displayed.
Step 4: Run the code
After completing the above code, save the HTML file and open it in the browser. You will see a webpage with a map on which the administrative district boundaries of "Beijing City" have been drawn.
Summary:
This article introduces how to use JavaScript and Baidu Map API to realize the function of drawing the boundaries of map administrative areas. By calling the interface provided by Baidu Map API, we can obtain the boundary data of the administrative region and draw it on the map. This allows us to flexibly display and operate administrative region information in web development. I hope the code examples in this article can be helpful to everyone!
The above is the detailed content of How to use JS and Baidu Maps to implement the map administrative district boundary drawing function. For more information, please follow other related articles on the PHP Chinese website!

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.

The power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.

Introduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Atom editor mac version download
The most popular open source editor

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 Mac version
God-level code editing software (SublimeText3)

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
