javascript - 裁剪图像并使用 php 上传

我有一个裁剪图像脚本。当用户单击保存按钮时，脚本如何上传裁剪后的图像？如何使 PHP 裁剪图像并上传到服务器？

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>Cropper.js</title>
  <!-- <link rel="stylesheet" href="dist/cropper.css"> -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/0.8.1/cropper.css" />
  
  <style>
    .container {
      max-width: 640px;
      margin: 20px auto;
    }

    img {
      max-width: 100%;
    }
  </style>
</head>
<body>

  <div class="container">
    <h1>Cropper with a range of aspect ratio</h1>
	
    <div>
      <img id="image" src="https://fengyuanchen.github.io/cropperjs/images/picture.jpg" alt="Picture">
    </div>
	<button onclick="cropper.getCroppedCanvas()">Save</button>
  </div>

  <!-- <script src="dist/cropper.js"></script> -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/0.8.1/cropper.js"></script>
  <script>
    window.addEventListener('DOMContentLoaded', function () {
      var image = document.querySelector('#image');
      var minAspectRatio = 1.0;
      var maxAspectRatio = 1.0;
      var cropper = new Cropper(image, {
        ready: function () {
          var cropper = this.cropper;
          var containerData = cropper.getContainerData();
          var cropBoxData = cropper.getCropBoxData();
          var aspectRatio = cropBoxData.width / cropBoxData.height;
          var newCropBoxWidth;

          if (aspectRatio < minAspectRatio || aspectRatio > maxAspectRatio) {
            newCropBoxWidth = cropBoxData.height * ((minAspectRatio + maxAspectRatio) / 2);

            cropper.setCropBoxData({
              left: (containerData.width - newCropBoxWidth) / 2,
              width: newCropBoxWidth
            });
          }
        },
        cropmove: function () {
          var cropper = this.cropper;
          var cropBoxData = cropper.getCropBoxData();
          var aspectRatio = cropBoxData.width / cropBoxData.height;

          if (aspectRatio < minAspectRatio) {
            cropper.setCropBoxData({
              width: cropBoxData.height * minAspectRatio
            });
          } else if (aspectRatio > maxAspectRatio) {
            cropper.setCropBoxData({
              width: cropBoxData.height * maxAspectRatio
            });
          }
        }
      });
    });
  </script>
  <!-- FULL DOCUMENTATION ON https://github.com/fengyuanchen/cropperjs -->
  <!-- My question is: How do i get the cropped image and upload via php ? -->
 
</body>
</html>

最佳答案

how to crop and upload when click save button? , How to make the php get the cropped image and upload to server?

在the readme , 方法说明 getCroppedCanvas()提到上传裁剪后的图片:

_{After then, you can display the canvas as an image directly, or use HTMLCanvasElement.toDataURL to get a Data URL, or use HTMLCanvasElement.toBlob to get a blob and upload it to server with FormData if the browser supports these APIs.}¹
cropper.getCroppedCanvas().toBlob(function (blob) {
  var formData = new FormData();

  formData.append('croppedImage', blob);

  // Use `jQuery.ajax` method
  $.ajax('/path/to/upload', {
    method: "POST",
    data: formData,
    processData: false,
    contentType: false,
    success: function () {
      console.log('Upload success');
    },
    error: function () {
      console.log('Upload error');
    }
  });
});

因此对于您的示例，标记为 save 的按钮引用了 cropper 但它仅在 DOM 加载回调的回调中定义(即 window.addEventListener ('DOMContentLoaded', function () {)。我建议使用事件委托(delegate)(参见下面提到的示例 plunker)，但如果您想引用 cropper，则需要在外部声明DOM 加载的回调。

var cropper;
window.addEventListener('DOMContentLoaded', function () {
    //assign cropper:
    cropper = new Cropper(image, { ...

您可以在 this plunker 中看到它的实际效果.它使用 PHP 代码，仅获取上传的裁剪图像并返回 base64 编码版本(使用 base64_encode() )。

plunker 示例中使用的 PHP 代码如下所示:

<?php
$output = array();

if(isset($_FILES) && is_array($_FILES) && count($_FILES)) {
     $output['FILES'] = $_FILES;

     //this is where the cropped image could be saved on the server
     $output['uploaded'] = base64_encode(file_get_contents($_FILES['croppedImage']['tmp_name']));
}
header('Content-Type: application/json');
echo json_encode($output);

不只是回显文件的 base64 编码版本，move_uploaded_file()可用于上传文件，然后返回有关上传文件的信息(例如文件 ID、路径等)。

move_uploaded_file($_FILES['croppedImage']['tmp_name'], '/path/to/save/cropped/image');

¹_{( https://github.com/fengyuanchen/cropperjs#user-content-getcroppedcanvasoptions )}

关于javascript - 裁剪图像并使用 php 上传，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42793245/

javascript - 裁剪图像并使用 php 上传

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