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【未解決】「パーフェクトJavaScript」p.288 リスト11.7 のコード。クリックした座標にdiv要素を移動させたい。しかしできない。取り出したmessageオブジェクトのtop, left属性は空… 何か間違えている？
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| <!DOCTYPE HTML> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>クリックした位置に要素を表示する</title> | |
| </head> | |
| <body> | |
| <div id="foo" style="width: 2000px; height: 2000px; position: relative;"> | |
| <div id="message" style="position: absolute; background: lightgray; width: 100px;">Hello, World!</div> | |
| </div> | |
| <script> | |
| var foo = document.getElementById('foo'); | |
| function getPosition(event) { | |
| var x = event.clientX; | |
| var y = event.clientY; | |
| var r = event.target.getBoundingClientRect(); | |
| x -= r.left; | |
| y -= r.top; | |
| return { x: x, y: y }; | |
| } | |
| foo.addEventListener('click', function (event) { | |
| var message = document.getElementById('message'); | |
| if (event.target === message) { | |
| // message自体がクリックされたときはなにもしない | |
| return; | |
| } | |
| var pos = getPosition(event); | |
| message.style.left = pos.x; | |
| message.style.top = pos.y; | |
| console.log(message.style.left+"\n"); | |
| console.log(message.style.top+"\n"); | |
| }, false); | |
| </script> | |
| </body> | |
| </html> |
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これで合っているのか不明ですが、
message.style.left = pos.x + 'px';
message.style.top = pos.y + 'px';
で動きました。