How to use Layui to implement image cropping and rotation functions
How to use Layui to implement image cropping and rotation functions
1. Background introduction
In web development, we often encounter the need to crop and rotate images. scenarios, such as avatar uploading, picture editing, etc. Layui is a lightweight front-end framework that provides rich UI components and friendly APIs, and is especially suitable for quickly building web applications. This article will introduce how to use Layui to implement image cropping and rotation functions, and provide specific code examples.
2. Environment preparation
Before starting, you need to confirm that the following environment is ready:
- Layui framework: You can download it from the layui official website (https://www.layui. com/) to download the latest version of layui.
- jQuery library: Layui depends on the jQuery library, and you need to introduce jQuery's CDN address or local file.
- Image cropping plug-in: Layui does not provide native image cropping function. We can choose to use third-party image cropping plug-ins, such as "cropper", "jcrop", etc.
3. Implementation steps
-
Introduce the required files
tag and the files required by the image cropping plug-in. The specific code is as follows:
Create an HTML file and introduce Layui and jQuery in the<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>图片裁剪和旋转功能</title> <link rel="stylesheet" href="layui/css/layui.css"> <script src="layui/layui.js"></script> <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script> <script src="cropper.js"></script> <link rel="stylesheet" href="cropper.css"> </head> <body> ... </body> </html>
Copy after login Create a
container
Create acontainer in , Used to display the cropped image and set the size of the cropping area. The specific code is as follows:<body> <div id="image-container" style="width: 500px;height: 500px;"></div> </body>
Copy after loginInitialize the image cropping plug-in
In the
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