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 March 2017.

实验性: 这是一项实验性技术
在将其用于生产之前，请仔细检查浏览器兼容性表格。

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

BCD tables only load in the browser

参见