How to use Layui to implement drag-and-drop image cropping function

How to use Layui to implement drag-and-drop image cropping function

With the rapid development of the mobile Internet, the image cropping function is widely used in various products. To implement the drag-and-drop image cropping function, we can use Layui, an excellent front-end development framework, to simplify the development process. This article will introduce how to use Layui to implement draggable image cropping function, and give specific code examples.

1. Introduce the Layui framework and related libraries

Before implementing the drag-and-drop image cropping function, we need to introduce the Layui framework and related libraries. First, add the following code in the

tag of the HTML file:

<link rel="stylesheet" href="https://cdn.staticfile.org/layui/2.5.6/css/layui.css">
<script src="https://cdn.staticfile.org/layui/2.5.6/layui.js"></script>

2. Create HTML structure

Next, we need to create the HTML structure to display the image and Crop box. Add the following code in the

tag:

<div class="demo" style="margin:20px;">
  <div class="layui-upload">
    <button type="button" class="layui-btn" id="upload">上传图片</button>
    <button type="button" class="layui-btn" id="cut">裁剪图片</button>
  </div>
  <div class="layui-upload-img" id="image-container"></div>
  <div class="layui-row layui-col-space10" id="crop-container"></div>
</div>

3. Writing JavaScript code

In the HTML structure, we added buttons for uploading images and cropping images, and A container for displaying images (id is image-container) and a container for displaying crop boxes (id is crop-container). Next, we need to write JavaScript code to implement the upload, display and cropping functions of images. Add the following code in the <script> tag: </script>

layui.use('upload', function(){
  var upload = layui.upload;

  //执行实例
  var uploadInst = upload.render({
    elem: '#upload',
    url: '/upload/',
    done: function(res){
      //上传完毕回调
      if(res.code == 0){
        //显示图片
        $("#image-container").html('<img  src="' + res.data.src + '" class="layui-upload-img" alt="How to use Layui to implement drag-and-drop image cropping function" >');
        //裁剪图片
        initCrop(res.data.src);
      }
    }
  });
});

//初始化裁剪框
function initCrop(src) {
  layui.use(['slider', 'cropper'], function(){
    var slider = layui.slider, cropper = layui.cropper;

    //添加裁剪框
    $("#crop-container").html('<div id="crop"></div>');

    //创建实例
    var cropperInst = cropper.render({
      elem: '#crop',
      imgSrc: src,
      area: ['400px', '400px'],
      done: function(res){
        //裁剪完毕回调
        console.log(res);
      }
    });
  });
}

//裁剪图片
function cropImage() {
  layui.use('cropper', function(){
    var cropper = layui.cropper;
    //获取裁剪结果
    var result = cropper.getData('#crop');
    console.log(result);
  });
}

4. Add styles

Finally, we need to add some styles to beautify the page. Add the following code in the

.demo {
  width: 600px;
}

.layui-upload {
  margin-bottom: 10px;
}

.layui-upload-img {
  margin: 10px 0;
}

#crop {
  margin-top: 10px;
}

At this point, we have completed writing the code for using Layui to implement the drag-and-drop image cropping function. Next, we need to configure the server-side code to receive the uploaded image and return the cropped image.

Summary:

This article introduces how to use the Layui framework to implement drag-and-drop image cropping function. This function can be quickly implemented by introducing the Layui framework and related libraries, creating an HTML structure, writing JavaScript code, and adding styles. Hope this article is helpful to everyone. If you have any questions, please leave a message for discussion.

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