How to use JS and Baidu Maps to implement map pan function-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

How to use JS and Baidu Maps to implement map pan function

PHPz

Nov 21, 2023 am 10:00 AM

jsBaidu mapMap pan

How to use JS and Baidu Maps to implement map pan function

How to use JS and Baidu Map to implement map pan function

Baidu Map is a widely used map service platform, often used to display geographical information in Web development , positioning and other functions. This article will introduce how to use JS and Baidu Map API to implement the map pan function, and provide specific code examples.

1. Preparation
Before using Baidu Map API, you first need to apply for a developer account on Baidu Map Open Platform (http://lbsyun.baidu.com/) and create an application. After the creation is completed, you will get your own AK (Access Key), which will be used as the identity for each request.

2. Introduce Baidu Map API
Introduce the script file of Baidu Map API in the

tag of the HTML file. The code is as follows:

<head>
  <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=yourAK"></script>
</head>

Replace yourAK in the above code For your own AK.

3. Create a map container
Create a container element in the HTML file to display the map. You can assign an id to this container so that the container can be obtained by id in the following code. The code is as follows:

<div id="mapContainer" style="width: 100%; height: 500px;"></div>

4. Initialize the map
Initialize the map object in the JS file, the code is as follows:

var map = new BMap.Map("mapContainer");

Replace mapContainer in the code with the id of the map container you created .

5. Set the map center point
Set the initial center point of the map. The code is as follows:

var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);

Among them, 116.404 is the longitude and 39.915 is the latitude. The center point can be set according to actual needs. coordinate of.

6. Implement the map pan function
Next, we need to add two buttons to the page to trigger the map pan operation. The code is as follows:

<button onclick="panLeft()">向左移动</button>
<button onclick="panRight()">向右移动</button>

Then, implement the logic of the panning function in the JS file. The code is as follows:

function panLeft() {
  var mapCenter = map.getCenter();
  var newCenter = new BMap.Point(mapCenter.lng - 0.1, mapCenter.lat);
  map.panTo(newCenter);
}

function panRight() {
  var mapCenter = map.getCenter();
  var newCenter = new BMap.Point(mapCenter.lng + 0.1, mapCenter.lat);
  map.panTo(newCenter);
}

Here, the panLeft() function is used to pan the map to the left, and the panRight() function Used to pan the map to the right. In the code, the center point coordinates of the current map are obtained through the map.getCenter() method, then a new coordinate newCenter is created, and the center point of the map is moved to the new coordinates through the map.panTo() method.

7. Improve the map display
Finally, we need to call the map.enableScrollWheelZoom() method in the JS file to support the wheel zoom function. The code is as follows:

map.enableScrollWheelZoom(true);

8. Sample code
The following is the complete sample code:




  
  地图平移示例
  


  <div id="mapContainer" style="width: 100%; height: 500px;"></div>

Save the above code as an HTML file, and then open the file in the browser, that is You can see a map display page with map pan function. Click the action button and the map will pan left or right accordingly.

Summary
This article introduces how to use JS and Baidu Map API to implement the map pan function, and provides specific code examples. Through these sample codes, you can quickly get started using the Baidu Map API and implement the map pan function to meet your own needs.

The above is the detailed content of How to use JS and Baidu Maps to implement map pan function. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AM

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript: Exploring the Versatility of a Web LanguageApr 11, 2025 am 12:01 AM

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The Evolution of JavaScript: Current Trends and Future ProspectsApr 10, 2025 am 09:33 AM

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

See all articles