2nd/10_Wiki/Topic_CSS/CSS_Image_Modal.md at 9609c0475501c0a01c25b2af5accf5a1100054fe

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koriweb 9609c04755 docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더).
- Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외)
- Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체)
- Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속)
각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-23 19:21:18 +09:00

8.2 KiB

Raw Blame History

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title

🎯 한 줄 통찰 (One-line insight)

A modal image (lightbox) lets users click a gallery thumbnail to open a larger version in a full-screen overlay, built from a hidden fixed-position modal that JavaScript shows and hides. [S1]

🧠 핵심 개념 (Core concepts)

Modal overlay — the modal is a full-viewport layer (position: fixed, width: 100%, height: 100%) hidden by default with display: none and shown via JavaScript. [S1]
Dim backdrop — a semi-transparent background rgba(0, 0, 0, 0.8) and high z-index: 1000 darken the page behind the enlarged image. [S1]
Zoom-in animation — a @keyframes zoomIn animation scales the modal content from 0.6 to 1 when it opens. [S1]
Close control — a .close "×" (×) element in the top-right corner closes the modal. [S1]
Caption — a .caption element shows the image's label, populated from the trigger's onclick argument. [S1]
JavaScript control — openModal() sets display: "flex" and adds a show class; closeModal() removes the class and hides the modal after a 300ms delay. [S1]

🧩 추출된 패턴 (Extracted patterns)

Hidden fixed layer toggled by JS — keep the modal display: none, then switch to a flex layout on demand to center the enlarged content. [S1]
Class-driven transition + timed teardown — add a show class to animate in, and on close remove it and use setTimeout so the exit transition finishes before display: none. [S1]
Data passed via onclick args — the gallery image's onclick passes the modal id and caption text directly into the handler. [S1]

📖 세부 내용 (Details)

The W3Schools example builds a responsive modal image gallery in a single HTML document combining CSS and JavaScript. [S1]

<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

h1 {
  text-align: center;
  padding: 20px;
}

.gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  padding: 0 15px;
}

.gallery-item {
  position: relative;
  width: calc(25% - 20px);
  height: auto;
  margin: 10px;
  cursor: pointer;
  transition: transform 0.5s ease;
}

.gallery-item:hover {
  transform: scale(1.1);
}

/* The Modal (background) */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease;
}

/* Modal content (image) */
.modal-content {
  position: relative;
  width: 90%;
  height: auto;
  max-width: 90%;
  max-height: 90%;
  border-radius: 5px;
  overflow: hidden;
  animation: zoomIn 0.5s;
}

@keyframes zoomIn {
  from {transform: scale(0.6);}
  to {transform: scale(1);}
}

.modal.show {
  display: flex;
  opacity: 1;
}

/* Close button */
.close {
  position: absolute;
  top: 10px;
  right: 15px;
  color: #ffffff;
  font-size: 35px;
  font-weight: bold;
  cursor: pointer;
  transition: transform 0.3s;
}

/* Caption of modal image */
.caption {
  position: absolute;
  bottom: 15px;
  width: 100%;
  text-align: center;
  color: #ffffff;
  font-size: 24px;
}

@media screen and (max-width: 768px) {
  .gallery-item {
    width: calc(50% - 20px);
  }
}

@media screen and (max-width: 480px) {
  .gallery-item {
    width: calc(100% - 20px);
  }
}
</style>
</head>
<body>

<h1>Responsive Modal Images</h1>

<div class="gallery">
  <img src="img_5terre.jpg" alt="Cinque Terre" class="gallery-item" onclick="openModal('modal1', 'Cinque Terre')">
  <img src="img_forest.jpg" alt="Forest" class="gallery-item" onclick="openModal('modal2', 'Forest')">
  <img src="img_lights.jpg" alt="Northern Lights" class="gallery-item" onclick="openModal('modal3', 'Nothern Lights')">
  <img src="img_mountains.jpg" alt="Mountains" class="gallery-item" onclick="openModal('modal4', 'Mountains')">
</div>

<div id="modal1" class="modal">
  <span class="close" onclick="closeModal('modal1')">&times;</span>
  <img src="img_5terre.jpg" alt="Cinque Terre" class="modal-content">
  <div class="caption"></div>
</div>

<div id="modal2" class="modal">
  <span class="close" onclick="closeModal('modal2')">&times;</span>
  <img src="img_forest.jpg" alt="Forest" class="modal-content">
  <div class="caption"></div>
</div>

<div id="modal3" class="modal">
  <span class="close" onclick="closeModal('modal3')">&times;</span>
  <img src="img_lights.jpg" alt="Northern Lights" class="modal-content">
  <div class="caption"></div>
</div>

<div id="modal4" class="modal">
  <span class="close" onclick="closeModal('modal4')">&times;</span>
  <img src="img_mountains.jpg" alt="Mountains" class="modal-content">
  <div class="caption"></div>
</div>

<script>
function openModal(modalId, caption) {
  let modal = document.getElementById(modalId);
  modal.style.display = "flex";
  modal.classList.add("show");
  let message = modal.querySelector(".caption");
  message.innerText = caption;
}

function closeModal(modalId) {
  let modal = document.getElementById(modalId);
  modal.classList.remove("show");
  setTimeout(function () {
    modal.style.display = "none";
    modal.querySelector(".caption").innerText = "";
  }, 300);
}
</script>

</body>
</html>

Key components

Modal container — display: none initially, position: fixed, z-index: 1000, dark semi-transparent background rgba(0, 0, 0, 0.8). [S1]
Animation — zoom effect defined with @keyframes zoomIn scaling from 0.6 to 1. [S1]
JavaScript — openModal() retrieves the element by id, sets display to flex, adds the show class, and populates the caption; closeModal() removes the show class and hides the modal after a 300ms delay. [S1]
Responsive design — media queries adjust gallery items from 25% width (desktop) to 50% (tablets, ≤768px) to 100% (mobile, ≤480px). [S1]

🛠️ 적용 사례 (Applied in summary)

The full responsive modal-image gallery above is the source's applied case, integrating a flex gallery, a fixed overlay modal, a zoom animation, a close button, captions, and the open/close JavaScript. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Toggle-by-class modal control (language: JavaScript):

function openModal(modalId, caption) {
  let modal = document.getElementById(modalId);
  modal.style.display = "flex";
  modal.classList.add("show");
  modal.querySelector(".caption").innerText = caption;
}

function closeModal(modalId) {
  let modal = document.getElementById(modalId);
  modal.classList.remove("show");
  setTimeout(function () {
    modal.style.display = "none";
    modal.querySelector(".caption").innerText = "";
  }, 300);
}

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source.

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.90
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Image Hover, CSS Image Styling, CSS Animations, CSS Position
참조 맥락: Referenced when building an image lightbox or click-to-enlarge gallery.

📚 출처 (Sources)

[S1] W3Schools — CSS Image Modal — https://www.w3schools.com/css/css3_images_modal.asp

📝 변경 이력 (Change history)

2026-06-23: Initial draft synthesized from the W3Schools "CSS Image Modal" page (Astra wiki-curation, P-Reinforce v3.1 format).

8.2 KiB Raw Blame History Unescape Escape

CSS Image Modal