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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

caretPositionFromPoint() 特性为 DocumentOrShadowRoot interface returns a CaretPosition object, containing the DOM node, along with the caret and caret's character offset within that node.

句法

var caretPosition = document.caretPositionFromPoint(float x, float y);
					

参数

x

The horizontal coordinate of a point.

y

The vertical coordinate of a point.

返回

A CaretPosition 对象。

范例

This example inserts line breaks wherever you click. The code for it is below the demo.

Demo

HTML 内容

<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat,
sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.
Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
					

JavaScript Content

function insertBreakAtPoint(e) {
  var range;
  var textNode;
  var offset;
  if (document.caretPositionFromPoint) {
    range = document.caretPositionFromPoint(e.clientX, e.clientY);
    textNode = range.offsetNode;
    offset = range.offset;
  } else if (document.caretRangeFromPoint) {
    range = document.caretRangeFromPoint(e.clientX, e.clientY);
    textNode = range.startContainer;
    offset = range.startOffset;
  }
  // only split TEXT_NODEs
  if (textNode.nodeType == 3) {
    var replacement = textNode.splitText(offset);
    var br = document.createElement('br');
    textNode.parentNode.insertBefore(br, replacement);
  }
}
window.onload = function (){
  var paragraphs = document.getElementsByTagName("p");
  for (i=0 ; i < paragraphs.length; i++) {
    paragraphs[i].addEventListener("click", insertBreakAtPoint, false);
  }
};
					

规范

规范	状态	注释
CSSOM (CSS 对象模型) 视图模块 The definition of 'caretPositionFromPoint()' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table on 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
caretPositionFromPoint	Chrome No	Edge No	Firefox 20	IE No	Opera No	Safari Yes	WebView Android No	Chrome Android No	Firefox Android 20	Opera Android No	Safari iOS Yes	Samsung Internet Android No

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. DocumentOrShadowRoot
2. 特性

   1. activeElement
   2. fullscreenElement
   3. pointerLockElement
   4. styleSheets
3. 方法

   1. caretPositionFromPoint()
   2. elementFromPoint()
   3. elementsFromPoint()
   4. getSelection()
   5. msElementsFromRect()
   6. nodeFromPoint()
   7. nodesFromPoint()