HTML-JS-Models/slider.html at main · TaMinoDev/HTML-JS-Models · GitHub

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<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Slider - DEBUG</title>
    <style>
        #sliderDiv {
            border: 1px solid black;
            height: 250px;
            width: auto;
            min-width: 250px;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        #sliderDiv canvas {
            max-width: 100%;
            max-height: 100%;
            background-color: grey;
            object-fit: contain;
            display: block;
        }
    </style>
</head>
<body>
    <div id="sliderDiv" data-id="null" data-src="art10.png,art2.png,art3.png" data-index="0">
        <button onclick="back(this.parentElement.dataset.id)">&LeftArrow;</button>
        <canvas style="width: auto; height: auto;" id="canvas"></canvas>
        <button onclick="next(this.parentElement.dataset.id)">&RightArrow;</button>
    </div>
    <div id="sliderDiv" data-id="null" data-src="art4.png,art5.png,art6.png" data-index="0">
        <button onclick="back(this.parentElement.dataset.id)">&LeftArrow;</button>
        <canvas style="width: auto; height: auto;" id="canvas"></canvas>
        <button onclick="next(this.parentElement.dataset.id)">&RightArrow;</button>
    </div>
    <div id="sliderDiv" data-id="null" data-src="art7.png,art8.png,art9.png" data-index="0">
        <button onclick="back(this.parentElement.dataset.id)">&LeftArrow;</button>
        <canvas style="width: auto; height: auto;" id="canvas"></canvas>
        <button onclick="next(this.parentElement.dataset.id)">&RightArrow;</button>
    </div>
    <script>
        window.onload = () => {
            let index = 1;
            document.querySelectorAll('#sliderDiv').forEach(div => {
                div.setAttribute('data-id',index.toString().padStart(3,'0'));
                index++;
                load(div.dataset.id);
            });
        }

        window.onresize = () => {
            document.querySelectorAll('#sliderDiv').forEach(div => {
                load(div.dataset.id);
            });
        }

        const back = (input) => {
            const div = document.querySelector('div[data-id="' + input + '"]');
            let index = Number(div.dataset.index);
            const urls = div.dataset.src.split(',');
            if(index === 0) {
                div.dataset.index = urls.length-1;
            } else {
                div.dataset.index = index-1;
            }
            console.log(div.dataset.index);
            load(input);
        }

        const next = (input) => {
            const div = document.querySelector('div[data-id="' + input + '"]');
            let index = Number(div.dataset.index);
            const urls = div.dataset.src.split(',');
            if(index === urls.length-1) {
                div.dataset.index = 0;
            } else {
                div.dataset.index = index+1;
            }
            console.log(div.dataset.index);
            load(input);
        }

        const load = (input) => {
            const div = document.querySelector('div[data-id="' + input + '"]');
            const canvas = div.querySelector('#canvas');
            const ctx = canvas.getContext('2d');
            const urls = div.dataset.src.split(',');
            let index = Number(div.dataset.index);

            console.log({
                "div": div,
                "urls": urls,
                "index": index
            });

            const img = new Image();
            img.src = `pictures/${urls[index]}`;
            img.onload = () => {
                canvas.width = img.width;
                canvas.height = img.height;
                canvas.style.width = canvas.width;
                canvas.style.height = canvas.height;
                ctx.drawImage(img,0,0,canvas.width,canvas.height);
                console.log(urls[index]);
            }
        }
    </script>
</body>
</html>