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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。