Developing web album management application based on JavaScript-JS Tutorial-php.cn

Developing web album management application based on JavaScript

王林

Release： 2023-08-08 11:21:32

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Developing web album management application based on JavaScript

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>

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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);
        }
    });
});

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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;
}

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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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