Here’s a JavaScript solution that uses HTML5’s canvas to create a basic photo upload, zoom, crop, and download functionality. This script utilizes the Cropper.js library for easy image zooming and cropping.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Image Upload and Crop</title>
<!-- Cropper.js CSS -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.5.13/cropper.min.css" rel="stylesheet">
<!-- Custom CSS -->
<style>
body {
font-family: Arial, sans-serif;
display: flex;
align-items: center;
justify-content: center;
min-height: 100vh;
background-color: #f0f2f5;
margin: 0;
}
.container {
text-align: center;
background-color: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
max-width: 900px;
width: 100%;
margin: 30px 0px;
display: flex;
flex-direction: row;
}
.container .left-panel{
width: 70%;
padding: 0 10px;
}
.container .right-panel{
width: 30%;
padding: 0 10px;
}
h2 {
color: #333;
margin-bottom: 20px;
}
input[type="file"] {
display: block;
margin: 10px auto;
padding: 8px;
font-size: 16px;
cursor: pointer;
}
#image {
max-width: 100%;
border: 2px solid #ddd;
border-radius: 4px;
margin: 20px 0;
}
#download {
padding: 10px 20px;
font-size: 16px;
color: #fff;
background-color: #007bff;
border: none;
border-radius: 4px;
cursor: pointer;
transition: background-color 0.3s;
}
#download:hover {
background-color: #0056b3;
}
#download:disabled {
background-color: #ccc;
cursor: not-allowed;
}
/* Preview section styling */
.preview {
margin-top: 20px;
margin-bottom: 20px;
}
.preview canvas {
border-radius: 50%; /* To show the preview as a circle */
border: 2px solid #ddd;
max-width: 150px;
max-height: 150px;
background: #ccc;
}
</style>
</head>
<body>
<div class="container">
<div class="left-panel">
<h3>Round Image Cropper</h3>
<!-- Image upload input -->
<input type="file" id="uploadImage" accept="image/*">
<!-- Image container -->
<div style="margin-bottom: 20px;">
<img id="image" src="noimageavailable.jpg" alt="Upload an image to crop">
</div>
</div>
<div class="right-panel">
<!-- Preview section for real-time cropped image -->
<div class="preview" id="previewSection">
<h3>Preview of Cropped Image:</h3>
<canvas id="previewCanvas" width="150" height="150"></canvas>
</div>
<!-- Upload button -->
<button id="download" style="display:none;">Download Cropped Image</button>
</div>
</div>
<!-- Cropper.js Script -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.5.13/cropper.min.js"></script>
<script>
const uploadImage = document.getElementById("uploadImage");
const image = document.getElementById("image");
const downloadButton = document.getElementById("download");
const previewSection = document.getElementById("previewSection");
const previewCanvas = document.getElementById("previewCanvas");
const previewContext = previewCanvas.getContext("2d");
let cropper;
// Generate a random 12-character string
function generateRandomFilename(length = 12) {
const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
let result = '';
for (let i = 0; i < length; i++) {
result += characters.charAt(Math.floor(Math.random() * characters.length));
}
return result;
}
// Image upload and cropper initialization
uploadImage.addEventListener("change", (e) => {
const file = e.target.files[0];
if (file) {
const reader = new FileReader();
reader.onload = (e) => {
image.src = e.target.result;
image.style.display = "block";
// Initialize Cropper.js after image is loaded
image.onload = () => {
if (cropper) cropper.destroy();
cropper = new Cropper(image, {
aspectRatio: 1,
viewMode: 1,
scalable: true,
zoomable: true,
setDragMode: 'move',
crop() {
updatePreview();
}
});
downloadButton.style.display = "inline-block";
};
};
reader.readAsDataURL(file);
}
});
// Function to update the preview canvas with the cropped image
function updatePreview() {
if (!cropper) return;
const canvas = cropper.getCroppedCanvas({ width: 150, height: 150 });
// Clear previous preview
previewContext.clearRect(0, 0, previewCanvas.width, previewCanvas.height);
// Draw the cropped image as a circle
previewContext.beginPath();
previewContext.arc(75, 75, 75, 0, Math.PI * 2); // Centered circle in a 150x150 canvas
previewContext.closePath();
previewContext.clip();
previewContext.drawImage(canvas, 0, 0, 150, 150);
}
// Upload button - Cropping, rounding, and uploading to the server
downloadButton.addEventListener("click", () => {
if (cropper) {
const canvas = cropper.getCroppedCanvas({ width: 150, height: 150 });
// Create a rounded, transparent version
const roundedCanvas = document.createElement("canvas");
roundedCanvas.width = canvas.width;
roundedCanvas.height = canvas.height;
const context = roundedCanvas.getContext("2d");
context.beginPath();
context.arc(
canvas.width / 2,
canvas.height / 2,
canvas.width / 2,
0,
2 * Math.PI
);
context.closePath();
context.clip();
context.drawImage(canvas, 0, 0);
// Download the image
roundedCanvas.toBlob((blob) => {
const link = document.createElement("a");
link.href = URL.createObjectURL(blob);
link.download = `${generateRandomFilename()}.png`;
link.click();
URL.revokeObjectURL(link.href);
}, "image/png");
}
});
</script>
</body>
</html>