web-/practice9-6.html at main · midogi/web- · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>onwheel</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="main.css"/>
    <script src="main.js"></script>
</head>
<body>
<h3>마우스 휠을 이용한 이미지 확대/축소</h3>
<hr>
<p>
    이미지 위에 휠을 위로 굴리면 이미지가 축소되고,
    아래로 굴리면 이미지가 확대됩니다.
</p>
<img id="img" src="../../media/tulips.png" alt="" onwheel="wheel(event)" width="100px" height="100px">
<script>
    var size = 100;

    function wheel(e) {
        if (e.wheelDelta < 0) {
            size = size - (size * 0.05);
            if (size < 0) {
                size = 0;
            }
        } else {
            size = size + (size * 0.05);
        }
        document.getElementById("img").style.width = size + "px";
        document.getElementById("img").style.height = size + "px";
    }
</script>
</body>
</html>