Range.getBoundingClientRect()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
Range.getBoundingClientRect() 返回一个 DOMRect 对象，该对象将范围中的内容包围起来；即该对象是一个将范围内所有元素的边界矩形包围起来的矩形（译者注：关于边界矩形，可以参考 Minimum Bouding Rectangles）。
此方法可用于确定文本区域中选中的部分或光标的视窗坐标。关于返回值的详细信息，参见 Element.getBoundingClientRect()。
语法
boundingRect = range.getBoundingClientRect()
示例
HTML
html
<div id="highlight"></div>
<p>
This example positions a "highlight" rectangle behind the contents of a range.
The range's content <b>starts here</b> and continues on until it
<b>ends here</b>. The bounding client rectangle contains everything selected
in the range.
</p>
CSS
css
#highlight {
background: yellow;
position: absolute;
z-index: -1;
}
p {
width: 200px;
}
JavaScript
js
const range = document.createRange();
range.setStartBefore(document.getElementsByTagName("b").item(0), 0);
range.setEndAfter(document.getElementsByTagName("b").item(1), 0);
const clientRect = range.getBoundingClientRect();
const highlight = document.getElementById("highlight");
highlight.style.left = `${clientRect.x}px`;
highlight.style.top = `${clientRect.y}px`;
highlight.style.width = `${clientRect.width}px`;
highlight.style.height = `${clientRect.height}px`;
结果
规范
| Specification |
|---|
| CSSOM View Module # dom-range-getboundingclientrect |
浏览器兼容性
Loading…
参见
Range.getClientRects()- 对于非矩形的范围（如选择部分换行了）会返回更细致的结果。Element.getBoundingClientRect()Document.caretPositionFromPoint()- 使用视窗坐标获取节点范围。