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<!DOCTYPE html> <html> <head> <title>HTML, CSS and JavaScript demo</title> </head> <body> <div class="container"> <div class="left-panel"> <p class="lw">Hello Weaver!</p> </div> <div class="splitter" id="splitter"></div> <div class="right-panel"> <!-- 右パネルのコンテンツ --> </div> </div> </body> </html>
.container { display: flex; width: 100%; height: 100vh; } .left-panel, .right-panel { flex-grow: 1; overflow: auto; } .splitter { cursor: col-resize; background-color: #aaa; width: 5px; height: 100%; } .lw { font-size: 60px; }
const splitter = document.getElementById('splitter'); let isDragging = false; // マウスダウンイベントを監視 splitter.addEventListener('mousedown', function(e) { e.preventDefault(); // テキスト選択の防止 isDragging = true; }); // マウスが動いたときの処理 document.addEventListener('mousemove', function(e) { if (!isDragging) return; const x = e.clientX; const container = splitter.parentNode; const leftPanel = splitter.previousElementSibling; const containerRect = container.getBoundingClientRect(); const newLeftWidth = ((x - containerRect.left) / containerRect.width) * 100; leftPanel.style.width = `${newLeftWidth}%`; }); // マウスを離したときの処理 document.addEventListener('mouseup', function(e) { if (isDragging) { isDragging = false; } });