Question

我有一个绝对定位的div，其旋转变换为45度。它具有固定的高度，但宽度可以动态更改。

当我动态增加宽度时，整个元素会向右上移。

如何防止此运动使左边缘保持原位？

let box = document.getElementById('box')
let range = document.getElementById('range')

box.style.width = range.value + "px"; 

range.oninput = function() {
    box.style.width = range.value + "px"; 
}

#box {
  height: 100px;
  top: 100px;
  left: 100px;
  position: absolute;
  border: 1px solid black;
  transform: rotate(45deg)
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Resize box</title>
</head>
<body>
<div class="slidecontainer">
  <input type="range" min="50" max="300" value="50" class="slider" id="range">
</div>
  
<div id="box"></div>
</body>
</html>

Answer 1

设置transform-origin：

let box = document.getElementById('box')
let range = document.getElementById('range')

box.style.width = range.value + "px"; 

range.oninput = function() {
    box.style.width = range.value + "px"; 
}

#box {
  height: 100px;
  top: 100px;
  left: 100px;
  position: absolute;
  border: 1px solid black;
  transform-origin:0 0;
  transform: rotate(45deg)
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Resize box</title>
</head>
<body>
<div class="slidecontainer">
  <input type="range" min="50" max="300" value="50" class="slider" id="range">
</div>
  
<div id="box"></div>
</body>
</html>

旋转变换后调整div的大小时如何保留左上角的位置？

1 个答案: