ClientSideFileConverter/index.html at master · Rochum/ClientSideFileConverter · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>File converter</title>
    <link href="css/style.css" rel="stylesheet">
</head>
<body>
    <h1>ClientSideFileConverter</h1>
    <script>
        document.addEventListener("DOMContentLoaded", _ => sessionStorage.clear())
    </script>
    <input type="file" id="upload" accept="image/jpeg, image/png" multiple="multiple">
    <form>
        <label for="formats">Choose image format:</label>
        <select id="formats">
            <option value="image_to_png">PNG</option>
            <option value="image_to_jpeg">JPG/JPEG</option>
            <option value="image_to_avif">AVIF</option>
            <option value="image_to_webp">WEBP</option>
        </select>
        <button type="button" onclick="upload()">Submit</button>
    </form>
    <a id="image-field">
        <div>
            <button type="button" onclick="previousImage()"> previous </button>
            <button type="button" onclick="nextImage()">next</button>
        </div>
        <p style="display:inline" id="current-image">0</p>
        <p style="display:inline">/</p>
        <p style="display:inline" id="total-images">0</p>
    </a>
    <a id="image-url">
        <image id="preview" src="">
    </a>

    <a id="downloadLink" download="converted-image.png">Download Converted Image</a>
    <script>
        function upload() {
            document.handleImageUpload()
        }
        function nextImage() {
            changeImage(1)
        }
        function previousImage() {
            changeImage(-1)
        }

        function changeImage(offset) {

            let imagePreview = document.getElementById("preview");
            let imageUrl = document.getElementById("image-url");
            let images = JSON.parse(sessionStorage.getItem("images"));
            let current = document.getElementById("current-image");
            let total = document.getElementById("total-images");

            const newIndex = Number(current.textContent) + offset;
            if (!(0 < newIndex && newIndex <= total.textContent)) return;
            current.textContent = newIndex;
            imagePreview.src = images[newIndex - 1].url;
            imageUrl.href = images[newIndex - 1].url;
        }
    </script>
    <script type="module">
        import ImageThreadpool from "./image_threadpool.js";

        document.imageThreadpool = new ImageThreadpool();

        function handleImageUpload() {
            const files = document.getElementById("upload").files
            if (!files) return;
            for (const file of files) {
                const reader = new FileReader();
                reader.onload = function (event) {
                    const format = document.getElementById("formats").selectedOptions[0].value;
                    document.imageThreadpool.addTask({file: file, newFormat: format})
                }
                reader.readAsArrayBuffer(file);
            }
        }

        document.handleImageUpload = handleImageUpload
    </script>
</body>
</html>