JS(Vanilla)
배울 내용

이벤트 다루기
전체코드 1

<!doctype html>
<html lang="ko">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>라이트박스</title>
    <style>
        .row {
            width: 420px;
            margin: 0 auto;
        }

        .row ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .row ul li {
            display: inline-table;
        }

        /* 라이트 박스 스타일 */
        #lightbox {
            position: fixed;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            top: 0;
            left: 0;
            display: none;
        }

        #lightbox img {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border: 5px solid #eee;
        }
    </style>
</head>

<body>
    <div class="row">
        <ul>
            <li><img src="tree-1-thumb.jpg" data-src = "tree-1.jpg" class = 'pic'></li>
            <li><img src="tree-2-thumb.jpg" data-src = "tree-2.jpg" class = 'pic'></li>
            <li><img src="tree-3-thumb.jpg" data-src = "tree-3.jpg" class = 'pic'></li>
            <li><img src="tree-4-thumb.jpg" data-src = "tree-4.jpg" class = 'pic'></li>
            <li><img src="tree-5-thumb.jpg" data-src = "tree-5.jpg" class = 'pic'></li>
            <li><img src="tree-6-thumb.jpg" data-src = "tree-6.jpg" class = 'pic'></li>
        </ul>
        
    </div>
    <div>
        <input type="text" id="item">
        <button type="button" id='show'>추가</button>
    </div>

    <div id="lightbox">
        <img src = "tree-1.jpg" alt="" id="lightboxImage">
    </div>
    <script>
        var pics=document.querySelectorAll(".pic");
        var lightbox = document.querySelector("#lightbox");
        var lightboxImage = document.querySelector("#lightboxImage")

        function showLightbox() {
            var bigLocation = this.getAttribute("data-src");
            lightboxImage.setAttribute("src", bigLocation);
            lightbox.style.display = "block";
        }

        for(var i=0; i<pics.length; i++){
            pics[i].addEventListener("dblclick", showLightbox);
        }
        
        lightboxImage.addEventListener("click", function(){
            lightbox.style.display = "none";
        });

        var show = document.querySelector('#show');
        show.addEventListener("click", function(){
            var item = document.querySelector("#item").value;
            var bigLocation = pics[item].getAttribute("data-src");
            lightboxImage.setAttribute("src", bigLocation);
            lightbox.style.display = "block";
        });
        
    </script>
</body>

</html>
clearTimeout(time)

실행중인 setTimeout()을 강제로 종료한다.