ResizeObserverEntry.contentRect

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contentRect 只读特性在 ResizeObserverEntry interface returns a DOMRectReadOnly object containing the new size of the observed element when the callback is run. Note that this is better supported than ResizeObserverEntry.borderBoxSize or ResizeObserverEntry.contentBoxSize , but it is left over from an earlier implementation of the Resize Observer API, is still included in the spec for web compat reasons, and may be deprecated in future versions.

句法

var contentRect = resizeObserverEntry.contentRect;

值

A DOMRectReadOnly object containing the new size of the element indicated by the target 特性。

若 target is an HTML 元素 , the returned contentRect is the element's content box. If the target 是 SVGElement , the returned contentRect is the SVG's bounding box.

范例

The following snippet is taken from the resize-observer-text.html ( see source ) example. This uses a simple feature detection test to see if the browser supports the newer ResizeObserverEntry.contentBoxSize property — if so, it uses that to get the sizing data it needs. If not, it uses contentRect .

const resizeObserver = new ResizeObserver(entries => {
  for (let entry of entries) {
    if(entry.contentBoxSize) {
      h1Elem.style.fontSize = Math.max(1.5, entry.contentBoxSize.inlineSize/200) + 'rem';
      pElem.style.fontSize = Math.max(1, entry.contentBoxSize.inlineSize/600) + 'rem';
    } else {
      h1Elem.style.fontSize = Math.max(1.5, entry.contentRect.width/200) + 'rem';
      pElem.style.fontSize = Math.max(1, entry.contentRect.width/600) + 'rem';
    }
  }
});
resizeObserver.observe(divElem);

规范

规范	状态	注释
重置大小观测器 The definition of 'contentRect' in that specification.	编者草案	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`contentRect`	Chrome 64	Edge 79	Firefox 69	IE No	Opera Yes	Safari No	WebView Android 64	Chrome Android 64	Firefox Android No	Opera Android Yes	Safari iOS No	Samsung Internet Android 9.0

图例

完整支持
不支持

元数据

最后修改： Feb 27, 2020

重置尺寸观测器 API
ResizeObserverEntry
特性
1. borderBoxSize
2. contentBoxSize
3. contentRect
4. target
Related pages for Resize Observer API
1. ResizeObserver

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句法

值

范例

规范

浏览器兼容性

图例

相关话题