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How to use Layui to implement image cropping and rotation functions

WBOYOriginal: 2023-10-26 09:39:261270browse

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
Create an HTML file and introduce Layui and jQuery in the

tag and the files required by the image cropping plug-in. The specific code is as follows:

<!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>

Create a
container
Create a
container 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>
```

Initialize the image cropping plug-in
In the <script> tag, use layui's To customize the module, initialize the image cropping plug-in and set the relevant parameters. The specific code is as follows: </script>

<script>
  layui.use(['layer', 'cropper'], function(){
 var layer = layui.layer;
 var cropper = layui.cropper;
 
 // 获取图片的URL
 var imgUrl = '图片的URL';
 
 // 初始化裁剪插件
 cropper.render({
   elem: '#image-container',
   url: imgUrl,
   done: function(base64data){
     layer.closeAll();
     console.log(base64data);  // 裁剪后的图片数据
   }
 });
  });
</script>

Add a crop button
Add a button in
The cropping function is triggered after clicking the button. The specific code is as follows:
```
<body>
  ...
  <button onclick="startCrop()">开始裁剪</button>
  ...
</body>
```

Implementing the cropping function
Define the startCrop() function in the <script> tag, which is used to open the cropping interface , and listen to the closing event of the cropping window to obtain the cropped image data after cropping is completed. The specific code is as follows: </script>

<script>
  function startCrop(){
 layui.use('layer', function(){
   var layer = layui.layer;
   
   // 弹出裁剪窗口
   layer.open({
     type: 1,
     title: '裁剪图片',
     content: $('#image-container'),
     area: ['600px', '600px'],
     end: function(){
       // 裁剪完成后的处理
       console.log('裁剪完成');
     }
   });
 });
  }
</script>

4. Instructions for use

Replace the image URL with the actual image URL.
Adjust the size of the cropping area and the size of the cropping window as needed.
You can adjust relevant parameters and behaviors according to the actual scenario.

5. Summary
This article introduces how to use the Layui framework to implement image cropping and rotation functions. By introducing third-party plug-ins, we can quickly implement the image cropping function in the web page and obtain the cropped image data. I hope this article can be helpful to everyone and can be applied to your own development work in actual projects.

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How to use Layui to implement image cropping and rotation functions

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