DocumentOrShadowRoot.caretPositionFromPoint() - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

Syntax

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

Parameters

x

The horizontal coordinate of a point.

y

The vertical coordinate of a point.

Returns

A CaretPosition object.

Example

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

Demo

HTML Content

<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);
  }
};

Specifications

Browser compatibility

BCD tables only load in the browser