我已经能够为在该URL上找到的Web应用程序实施相同的UI逻辑，现在我被困在生成合并图像（即页面上显示的裁剪图像和占位符图像）的后端逻辑上）并将其呈现到DOM。
目前，我的AJAX永远不会通过成功回调来解决，相反，它始终会通过错误回调来解决，我不知道我在做什么错。如何获得与该网址中的Web应用程序完全相同的后端逻辑：https://rhapsodyofrealities.org/rhapathon/？
使用PHP，这是到目前为止我对后端逻辑的了解。这种方法的问题是，它尝试将图像直接输出到页面：
$targetDir = "uploads/";
$fileName = $targetDir.'complete_'.time().".png";
if(isset($_POST['image'])) {
$placeholder = './rhapathon.jpeg';
$src = $_POST['image'];
list($width, $height) = getimagesize($src);
// $placeholder = imagecreatefromstring(file_get_contents($placeholder));
$placeholder = imagecreatefromjpeg($placeholder);
// $src = imagecreatefromstring(file_get_contents($src));
$src = imagecreatefrompng($src);
imagecopy($placeholder, $src, 200, 200, 0, 0, 300, 300);
header('Content-Type: image/png');
// $imgobj = array("img" => imagepng($placeholder, $fileName));
// $result = json_encode($imgobj);
// echo $result;
imagepng($placeholder);
// Free Memory
imagedestroy($placeholder);
imagedestroy($src);
}
?>
我的HTML和整个UI和客户端逻辑：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<meta name=description content="Christ Embassy Kubwa Church">
<meta name=viewport content="width=device-width, initial-scale=1">
<title>Good Miracle Friday Crusade Flyer Generator</title>
<!-- <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap-reboot.min.css"> -->
<!-- <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap-grid.min.css"> -->
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css">
<!-- <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/croppie/2.6.4/croppie.css"> -->
<link rel="stylesheet" type="text/css" href="./node_modules/croppie/croppie.css">
<link rel="stylesheet" type="text/css" href="./index.css">
</head>
<body>
<!-- Header -->
<header class="container-fluid p-0 text-center rounded-0 m-0 mb-5">
<div class="jumbotron p-2 bg-info rounded-0 m-0">
<h1 class="font-weight-lighter display-5 text-white">GOOD MIRACLE FRIDAY CRUSADE</h1>
</div>
</header>
<!-- /Header -->
<div class="container">
<!-- Card -->
<div class="card mx-auto rounded-top rounded-bottom" style="overflow: hidden;">
<!-- Card-Head -->
<div class="card-heading bg-dark text-white p-2 lead font-weight-light">Create Avatar</div>
<!-- /card-Head -->
<!-- Card-Body -->
<div class="card-body">
<div class="row">
<div class="col-md-4 text-center">
<div id="upload-demo" style="width:350px"></div>
</div>
<!-- Col -->
<div class="col-md-4" style="padding-top:30px;">
<div class="mt-0 mb-5">
<strong>STEP 1 : Select Image and adjust to fit</strong>
<input type="file" id="upload" name="fileToUpload">
</div>
<div class="mt-0 mb-5">
<strong>STEP 2 : Upload Image and Download</strong>
<br>
<button class="btn btn-info upload-result">Upload Image</button>
</div>
</div>
<!-- /Col -->
<!-- Col -->
<div class="col-md-4">
<div id="upload-demo-i" style="background:url('./rhapathon.jpeg'); background-size: 300px 300px; width:300px;height:300px;margin-top:30px">
</div>
</div>
<!-- /Col -->
</div>
</div>
</div>
</div>
<!-- Scripts -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/js/bootstrap.min.js"></script>
<!-- <script src="https://cdnjs.cloudflare.com/ajax/libs/croppie/2.6.4/croppie.js"></script> -->
<script src="./node_modules/croppie/croppie.js"></script>
<!-- <script src="./node_modules/html2canvas/dist/html2canvas.min.js"></script> -->
<!-- <script src="./node_modules/canvas2image/canvas2image.js"></script> -->
<script src="./index.js"></script>
<script type="text/javascript">
$uploadCrop = $('#upload-demo').croppie({
enableExif: true,
enableOrientation: true,
viewport: {
width: 300,
height: 300,
type: 'circle'
},
boundary: {
width: 300,
height: 300
}
});
$('#upload').on('change', function () {
var reader = new FileReader();
reader.onload = function (e) {
$uploadCrop.croppie('bind', {
url: e.target.result
}).then(function(){
console.log('jQuery bind complete');
});
}
reader.readAsDataURL(this.files[0]);
});
$('.upload-result').on('click', function (ev) {
console.log('Uploading image');
$uploadCrop.croppie('result', {
type: 'canvas',
size: 'viewport',
}).then(function (resp) {
$.ajax({
url: "upload.php",
type: "POST",
data: {"image":resp},
dataType:'JSON',
success: function (data) {
console.log('response ='+data.img);
// html = '<img src="' + resp + '" />';
// $("#upload-demo-i").html(html);
html = '<img width="300px" src="' + data.img + '" /><a href=" '+data.img+' " download="gfmc"><button style="margin-top:20px; margin-bottom:100px" class="btn btn-danger upload-result">Download Avatar</button></a> <a href="http://rhapsodyofrealities.org"><button style="margin-top:-50px; margin-bottom:100px" class="btn btn-info upload-result">Proceed to Rhapsody Official Website</button></a>';
$("#upload-demo-i").html(html);
},
error: function (err) {
console.error('Error occured: ', err);
}
});
});
});
// Remove alt attribute from image
window.onload = () => {
document.querySelector('.cr-image').removeAttribute("alt");
document.querySelector('.cr-slider').value="0";
document.querySelector('.cr-slider').focus();
};
</script>
</body>
</html>
保存图像文件后添加以下行：
$image_file = fopen($fileName, 'r');
$image_data = fread($image_file, filesize($fileName));
header("Content-type: application/json");
echo json_encode(['img' -> 'data:image/jpeg;base64,' . base64_encode($image_data) );