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Developing web album management application based on JavaScript
- 王林Original
- 2023-08-08 11:21:321611browse
Developing a web album management application based on JavaScript
Foreword:
In the Internet era, with the popularity of mobile phone camera functions, photo management has become an important need . In order to meet users' needs for photo album management, this article will introduce how to use JavaScript to develop a simple web photo album management application.
Requirement analysis:
We hope to implement the following functions:
- Upload photos: Users can select local photo files and upload them to the album.
- Display photos: Display the photos in the album in the form of a grid. Users can click on the photo to view the larger image.
- Delete photos: Users can delete photos in the album.
- Category photos: Users can add classification information to photos to facilitate filtering of photos in the album.
Start development:
In order to implement this function, we will use HTML, CSS and JavaScript to develop.
First, we create the HTML structure:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>网页相册管理应用</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h1>网页相册管理应用</h1>
<div id="upload">
<input type="file" id="file-input" accept="image/*">
<button id="upload-btn">上传照片</button>
</div>
<div id="album"></div>
<script src="app.js"></script>
</body>
</html>Then, define the JavaScript logic for album management:
document.addEventListener("DOMContentLoaded", function() {
var fileInput = document.getElementById("file-input");
var uploadBtn = document.getElementById("upload-btn");
var albumDiv = document.getElementById("album");
// 当用户选择文件时
fileInput.addEventListener("change", function(e) {
var file = e.target.files[0];
var reader = new FileReader();
reader.onload = function(e) {
var img = document.createElement("img");
img.src = e.target.result;
albumDiv.appendChild(img);
};
reader.readAsDataURL(file);
});
// 当用户点击"上传照片"按钮时
uploadBtn.addEventListener("click", function(e) {
fileInput.click();
});
// 当用户点击照片时
albumDiv.addEventListener("click", function(e) {
if (e.target.tagName === "IMG") {
var img = document.createElement("img");
img.src = e.target.src;
img.style.width = "80%";
img.style.height = "80%";
img.style.margin = "10% auto";
img.style.display = "block";
img.style.position = "fixed";
img.style.top = "0";
img.style.left = "0";
img.style.right = "0";
img.style.bottom = "0";
img.style.backgroundColor = "rgba(0, 0, 0, 0.8)";
img.style.zIndex = "9999";
img.addEventListener("click", function() {
img.remove();
});
document.body.appendChild(img);
}
});
});Finally, define the CSS style:
body {
font-family: Arial, sans-serif;
text-align: center;
}
h1 {
margin-top: 30px;
}
#upload {
margin: 30px 0;
}
#album {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
#album img {
width: 200px;
height: 200px;
margin: 10px;
object-fit: cover;
cursor: pointer;
} Summary:
Through the above development, we have implemented a JavaScript-based web album management application. Users can upload photos, view photos, and delete photos in the album. This example is just a simple implementation that you can extend and optimize according to your needs. I hope this article is helpful to you, and happy development!
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